Re: [CentOS] X forwarding
On Sat, Feb 2, 2013 at 9:49 AM, skull skul...@gmx.ch wrote: How does one use X forwarding properly? ... Anything else there is to do? When i try to: ssh -X root@server virt-manager Just to be sure, you are in an xterm with DISPLAY set to the local X-Server before issuing the ssh? Try substitute -Y for -X, like: ssh -Y root@server When you are logged in to the server, what is DISPLAY set to? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] full image backup
The question is really about bare metal restore, yes? I would recommend clonezilla and that you create a bootable thumb drive or cd and be sure you can boot off of either and access the storage that you intent to contain your backup. Brett On Tue, Oct 30, 2012 at 7:22 AM, Hossein Lanjanian hossein.lanjan...@gmail.com wrote: Hi every body I am a new centos user. I installed centos 6 on my laptop and add some software to it. How can I create a full image (boot able) back up of it. ( some thing like windows full image backup). please help! -- With The Best H.Lanjanian ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] wins option in nsswitch.conf not working
On Sun, Jun 3, 2012 at 1:50 PM, Peter Peltonen peter.pelto...@gmail.comwrote: If I add wins at the end of the hosts section in /etc/nsswitch.conf the resolver seems to get stuck as after ping it just hangs (there is no output, I have to quit it with CTRL+C) Works on my network, my nsswitch.conf looks like this: hosts: files [!NOTFOUND=return] wins [!NOTFOUND=return] dns I seem to recall that the [!NOTFOUND=return], which is confusing as a double negative, keeps things like ping from hanging by causing an immediate return once a resolution is found. Order is important, so the above looks in the local files (/etc/hosts), then WINS and finally DNS, if you change the order, you may get different results. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] VirtualBox on CentOS 6.0?
On Wed, Nov 2, 2011 at 4:04 AM, Roy Trubshaw roy.trubs...@yahoo.co.ukwrote: - Here's a relatively complete description on turning VirtualBox into a service under Redhat/Centos/Fedora ( http://www.kernelhardware.org/virtualbox-auto-start-vm-centos-fedora-redhat/ ). Using VB 4.1.x under CentOS 6 to run CentOS 5 6 and WindowsXP guest VMs without issue. Be sure to read the comments on the above link, the script needs some minor adjustments. Being able to copy guest VMs between Linux and Windows Hosts supports a robust development and fall back environment. While I have noticed a few minor issues with VB, overall it has been stable. The issues I've noticed are occasional screen paint issues using seamless mode and there is no way to delete a snapshot without applying the changes from the snapshot. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba + Openldap
Anyone have an update tutorial/howto for samba to authenticate to ldap? - Not so much a Samba issue, make sure you have a known local username and password so you are not locked out if the LDAP server fails to start for whatever reason, especially if you disable network logins as root, as you should! Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] OT: Java down
Sun was purchased by Oracle, the updated URL: http://java.oracle.com Brett On Fri, Nov 19, 2010 at 7:17 AM, Helmut Drodofsky drodof...@internet-xs.dewrote: Hallo, yesterday from 3 to 11 pm UTC our Java application was down. As far as I know, the server java.sun.com was not available. Needs any java application direct access to sun? Can I stop this hell? Any idea? Best regards Helmut ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] error rsyncing large file
On Wed, Jan 20, 2010 at 1:01 PM, Joseph L. Casale jcas...@activenetwerx.com wrote: snip As it's a 20 gig file I am trying to send the diff of with a -c, I suspect over snip This might be too basic a question, what type of file system are you using on the CentOS system? For instance if it is the ext2/ext3 file system, there are file size limits depending on such things as the block size: http://en.wikipedia.org/wiki/Ext2#File_system_limits. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] SSH slow
In /etc/ssh/sshd_config change: UseDNS yes to UseDNS no Brett On Mon, Jan 18, 2010 at 6:08 PM, ML mailingli...@mailnewsrss.com wrote: Hi All, All of my systems are running 5.4 x64. The are all AMD x64 processors with at least 2gb of RAM in each. I am running SSH on a non standard port. When I SSH into ANY of my systems, I get prompted for my password right away, but after entering, it takes 30+ seconds to get logged in and get a prompt so I can work. I dont quite know what to look for here Does anyone have thoughts? -Jason ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Backup server
On Wed, Jan 13, 2010 at 5:04 AM, Sorin Srbu sorin.s...@orgfarm.uu.se wrote: snip The way we currently do backups is to use rsync from the clients to two folders on an older server that rolls over every other week. This worked fine for a while, but the rsync is cumulative and the users generate a tremendous amount of data... snip You might want to check out the rsync switches --backup-dir and --suffix. Using them some thing like this: --delete --backup --backup-dir=$MIRROR_DIR/RsyncBckups --suffix=.$DATE allows you to keep an exact duplication of the original directory and keeping the original files that were either deleted or overwritten in a seperate backup directory with dated suffixes, which can be archived on some regular basis. This should allow you to keep the simplicity of rsync and control the cumulative size. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Confusion about scheduling tasks with crontab
On Sun, Oct 18, 2009 at 11:11 AM, ne... guhv...@gmail.com wrote: On Sun, Oct 18, 2009 at 16:09, Niki Kovacs cont...@kikinovak.net wrote: I have to setup a scheduled task on a server, and I just read through some crontab docs. Now I'm confused. It's not so much the syntax of the cron job to define (I got that), it's more... how do I get to define it? Use a text editor (vi or the likes) to edit /etc/crontab directly? Or create some empty file in /etc/cron.daily or /etc/cron.hourly or the likes and then edit it using crontab -e ? As root, crontab -e. This is all you need. If the script is to run as root and you aren't overly concerned about the precise time your script runs, only that it runs at these intervals, you can place your script or a soft-link to your script in one of the directories /etc/cron.monthly, /etc/cron.weekly, /etc/cron.daily and /etc/cron.hourly. Any output from your script will be emailed to you, if this is setup. To the best of my knowledge the scripts in these directories are run in alphabetical order, you can control the order if desired by the naming of the script. In this case, crontab -e is not needed, create your script in our favorite editor. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Strange XEN on CentOS HWaddr Address Issue
Ran into a strange issue with XEN on CentOS that I think is specific to CentOS, which is why I'm starting by posting to this list first, I'll post on the XEN list depending on responses. My sense is this issue has something to do with how CentOS handles network setup on first boot of the XEN kernel. - Installed a brand new CentOS 5.3 server with minimal packages. - Installed XEN, modified grub.conf to boot off of the XEN kernel and rebooted. - After reboot, network connectivity was lost. - Investigation concluded the issue was that the HWaddr address of the physical NIC matched the fabricated HWaddr that XEN uses for most of its adapters: FE:FF:FF:FF:FF:FF. - Temporary resolution, I re-enabled the motherboard's NIC, rebooted, all seems to be working. I would like to get the NIC in question working as it is a GigaBit NIC, but it still has the HWaddr: FE:FF:FF:FF:FF:FF which conflicts with XEN. My understanding of the HWaddr is that the first portion is manufacturer assigned for uniqueness, I cannot image this NIC originally had this HWaddr, but I don't know what it originally was. Does anyone know if this value is read from the NIC on each boot, or is it stored in a file after the first boot? Is there someway to undo this change so the NIC returns to its original value or atleast a non-conflicting value? Has anyone else seen this behavior? Thank you in advance, Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Strange XEN on CentOS HWaddr Address Issue
On Tue, Aug 4, 2009 at 9:09 AM, Christoph Maserc...@financial.com wrote: snip When Xen starts does some trickery with your interfaces. You should see FE:FF:FF:FF:FF:FF on device peth0 and the real MAC-address on device eth0. All Xen vif devices will show also MAC FE:FF:FF:FF:FF:FF. That is totally normal. I wanted to clarify on this point. Understood as far as the above, but the issue is that the PHYSICAL MAC was changed to FE:FF:FF:FF:FF:FF. This went so far as to still have this value even after rebooting on the standard kernel and then uninstalling XEN: # dmesg | grep eth1 eth1: RTL8110s at 0xee156c00, fe:ff:ff:ff:ff:ff, XID 0400 IRQ 22 What ever happened during the first boot of XEN caused a permanent change to this NIC as far as I can tell. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Strange XEN on CentOS HWaddr Address Issue
Maybe because you are looking at the bridge's mac and not the ethernet's which would be peth0. No I am not. dmesg shows the kernel messages at boot and it is looking at the physical device, let's not get distracted, the issue is clear in this regard. As I previously stated, this happens even when uninstalling XEN and booting off the non-XEN kernel since the install of XEN. indeed, AFAIK all hardware adapters start with 00. This must have been set in the BIOS or with a boot option or in the network config. This was helpful, gave me places/incentive to continue looking. In /etc/sysconfig/network-scripts/ifcfg-eth1 I found: # Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet DEVICE=eth1 BOOTPROTO=none HWADDR=00:40:F4:CE:E6:7B So now I know what the original MAC address was. Here is where it gets interesting. The following file was modified at the date/time that the XEN kernel was first booted: /etc/sysconfig/hwconf and it has fe:ff:ff:ff:ff:ff for BOTH network adapters: desc: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet networfe:ffddr: fe:ff:ff:ff:ff:ff vendorId: 10ec deviceId: 8169 subVendorId: 10ec subDeviceId: 8169 pciType: 10 desc: Intel Corporation 82562EZ 10/100 Ethernet Controller network.hwaddr: fe:ff:ff:ff:ff:ff vendorId: 8086 deviceId: 1050 subVendorId: 8086 subDeviceId: 303a Everything I'm finding is re-enforcing my original theory that XEN modified the hwaddr of this NIC. The question continues to be what caused this and how to change it back. Given this is a stock system, I have to believe others must have/may run into this issue. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] How do I change passwords / remove users for Samba?
On Tue, Jun 23, 2009 at 5:25 AM, Kevin Thorpeke...@pibenchmark.com wrote: Yet I can still connect to the shares as kevin. strange As root try: # service smb reload Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] How do I change passwords / remove users for Samba?
On Tue, Jun 23, 2009 at 6:49 AM, Kevin Thorpeke...@pibenchmark.com wrote: On 23/06/2009 11:39, Kevin Thorpe wrote: Well I finally worked it out. Reboot Windows then it works. Bah! Stupid Microsoft. Wasted half my morning because Windows is broken. Windows helpfully remembers your username and password for the duration of your login. A logoff and back in would had sufficed. What I have found is that Windows remembers username and password per host, so once you connect to a share on a given host with a particular username and password, you cannot connect to the same host with a different username and password. One work around is to use the netbios aliases feature which allows a server to have multiple names on a network. This would allow you to connect to the same server with different user names during the same Windows session as it would think you are connecting to a different host. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] How do I change passwords / remove users for Samba?
I don't think you can connect to the same machine as 2 different users - and windows will cache connections even if they aren't mapped to a drive letter. If it happens again, try 'NET USE' from a cmd window to see if you have lingering connections and delete them. If it were a Windows server, yes, how ever if you use the netbios alias option in Samba, the Windows client thinks it is connecting to different servers, and the Samba server doesn't care. I know this works as I use it. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Make sshd log IP addresses, not hostnames
On Mon, Jun 22, 2009 at 3:21 PM, Scott Mosemanscmose...@gmail.com wrote: Can I adjust the ssh daemon to log IP addresses instead of hostnames? In sshd_config set UseDNS to no: UseDNS no Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] OT: looking for a rsync equivalent for Windows platforms
On Sat, Jun 6, 2009 at 4:39 AM, Rudi Ahlersrudiahl...@gmail.com wrote: Hi all, Does anyone know of a good free rsync type program for Windows platforms? Like most of us, I need to work on both Windows Linux environments, and would like to sync some data (music, videos, photos, documents, thunderbird profiles, FF bookmarks, etc) between a USB HDD, my Linux (CentOS + KDE) PC, and Windows Laptop at the office. Cygwin allows you to run rsync in Windows. Cygwin allows you to use many if not all GNU tools such as ssh, bash... There are of course minor issues due to the differences in the FAT/NTFS vs. ext file systems, most of which are masked by Cygwin. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Bug in yum Logwatch reporting
I've been noticing yum updates on several servers I manage over the last few weeks, which I know I didn't perform and could not explain until this morning. At first I suspect a break-in, but found no other evidence or reason an intruder would run the yum updates I was viewing. Yum updates are logged in /var/log/yum.log, which is what Logwatch scans. Seems that the format of the log entries is: MMM DD, the year is missing! This morning looking at this log sequentially I noticed I did do yum updates on Apr 02 and Apr 03 as reported in last night's logwatch, but not April of 2009, but rather April of 2008! Has anyone else noticed this behavior and/or know if there is a fix in progress for it? Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Quickbooks and Samba and Oplocks... OH MY
On Thu, Jan 29, 2009 at 11:36 AM, Tim Nelson tnel...@rockbochs.com wrote: It is widely known that Quickbooks has a horrible storage engine, requires Windows to host multiuser access, etc. However, I've successfully been storing QuickBooks files on Samba shares at a handful of locations with no real issues other than slight performance degradation. However, a somewhat recent thread here mentioned the proper use of oplock'ing in the Samba configuration to considerably increase performance/reliability. I am able to host all files other than Quickbooks on Samba shares. The issue with QuickBooks is they run their own WIndows service on port 10172 in addition to Windows file sharing. If someone has figured out a way around this, I would prefer to host multiple user QuickBooks access on Samba. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Single Session VNC
On Sat, Jan 24, 2009 at 12:19 AM, karl balsmeier karlski2...@gmail.com wrote: Currently most machines I connect to use a display, but I want to run vncserver such that the display is always 0. Is this possible. Can you be more specific about your question? If you are asking about the :# suffix, such as target:1, that is the port number to connect to the appropriate VNC server. :0 is the console at port 5900, :1 port 5901, :2 5902 and so on. Is your question you don't want to type the :0, you want to connect to the console, or something else? Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Old Small Box
On Wed, Jan 21, 2009 at 6:06 PM, Mike -- EMAIL IGNORED m_d_berger_1...@yahoo.com wrote: I have an old 400mHz Dell with a 20G hard drive and 125M ram. Can I install and run CentOS on it? Depends on what you want to use it for. I have successfully run CentOS on PIIIs with as little as 256MB of memory, but with limited functionality enabled, usually as a firewall, SAMBA server and/or web server. In all cases I took care during installation to install as little software as possible, disable all unnecessary daemons and use only the command line. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Any way to reduce CPU use of OpenSSH?
On Thu, Dec 11, 2008 at 10:14 AM, Steve Snyder [EMAIL PROTECTED] wrote: On my CentOS v5.2 server (dual Pentium4) the OpenSSH daemon stands out as being the most CPU-intensive of the applications running, It's used 176 minutes of CPU time in the last 2 days alone. Can you tell us more about how your system is used, especially in regard to ssh? Are there many logins? Is X forwarding used? Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS-virt] Need Help with Xen Please
On Thu, Nov 27, 2008 at 3:52 AM, Jason Taylor [EMAIL PROTECTED] wrote: Brett: Thank you for your help. It has been a few days since I was able to give this a try. However I installed Cygwin on my Windows desktop and SSH'd to the headless machine. I then ran virt-install without the graphics support. Doing this I was able to get past where it was stuck before. Glad that worked for you. Just to be clear, if you use 'ssh -Y target', you can use the graphical virt tools, I do this all the time. Brett ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS] Stop the FUD Xen is not deprecated
On Tue, Nov 25, 2008 at 10:45 AM, Vandaman [EMAIL PROTECTED] wrote: Do people have wet underwear for nothing over XEN? See http://www.redhat.com/promo/qumranet/ As far as CentOS is concerned saying Xen is deprecated is jumping the gun. CentOS ships with Xen and as long as upstream supports it, CentOS by extension supports it. Thank you for the clarification. What isn't clear from reading the above referenced material is if Xen will be included in future CentOS releases. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Stop the FUD Xen is not deprecated
On Tue, Nov 25, 2008 at 2:13 PM, Tom Brown [EMAIL PROTECTED] wrote: snip Xen wont be in RHEL6 - KVM will What insight can be offered on this change? Is this a business or technical or both decision? libvirt handles both so fundamentally it makes no difference as to what the virtualization technology is as the way its managed will not change I would image there has to be a conversion, for instance the format of the disk image, or the way that networking is setup? Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS-virt] Need Help with Xen Please
On Tue, Nov 18, 2008 at 6:41 AM, Brett Worth [EMAIL PROTECTED] wrote: Jason Taylor wrote: When you connect to the Centos server from your remote console you said before that you're using ssh. Is this from another Linux system? You need to ensure that you have access to your local graphical interface from the remote server i.e. that you have a valid DISPLAY variable set. If echo $DISPLAY returns an empty string then maybe you just need to do ssh -X centos_server when connecting so that ssh will forward the X11 back to your display. Then virt-manager should work. Sometimes ssh -Y works when ssh -X doesn't. Over time I've started using ssh -Y as it always works. If the server is setup correctly, it will not allow you to ssh as root, you'll need to ssh -Y as yourself and then su -. When you use the su command you might loose the DISPLAY variable, in this case simply re-establish it and all should work. If you workstation is Linux, you have an X-Display running. If it is Windows, you can use Cygwin as your X-Server. Brett ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] Need Help with Xen Please
One thing: you want to use the Xen 3.2 rpms provided by xen.org for serious production work on CentOS and not the one coming with CentOS. Suggest you read the archives of the list for all tips and caveats. I've been using the stock Xen (2.6.18) that comes with the latest CentOS 5.2 in production without major issue. At one time I had to restart xend occasionally to be able to properly reboot guest OSes from virt-manager, but even that has stabilized. What specifically is better about 3.2 that you are recommended it over 2.6.18? My experience to date with CentOS is it tends to run the latest, proven stable version of each package, which would make me hesitant to run downloaded packages. As far as virt-manager, use ssh -X or ssh -Y to connect to the DomU then start up virt-manager, this should reflect the GUI back to the originating workstation. Brett ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS] Rebooting CentOS 5.2 XEN Guest
On Thu, Oct 9, 2008 at 3:43 PM, Kai Schaetzl [EMAIL PROTECTED] wrote: Brett Serkez wrote on Thu, 9 Oct 2008 14:23:16 -0400: At one time when I issued an 'init 6' in one of the XEN guests it rebooted I've narrowed the issue to the xend and xendomains daemons. On one of my systems I was able to init 6 and init 0 no problem, then suddenly I could not, when this occurred, CPU utilization was 100% on one CPU on the host with the guest said either Restarting System or System Halted. After some investigation I found that if I restarted the xend and xendomains services I could once again init 0 and init 6. I usually use xm reboot from the host. You can also use reboot from within the guest. I remember *one* occurence quite a few months back where after an update I had problems to shut a VM down. But it happened only that one time. Note, there is a centos-virt list. Thanks for this tip, I have signed up on the centos-virt list. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Re: help required
On Thu, Oct 16, 2008 at 5:51 PM, John Hinton [EMAIL PROTECTED] wrote: Scott Silva wrote: If you do wish to have two equally accessible mailservers, users will need to be replicated. I was thinking LDAP would be better than raw passwd files. LDAP can be configured on the secondary mail server to keep users in sync with the primary for instant availability. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Rebooting CentOS 5.2 XEN Guest
All, I have CentOS 5.2 XEN guests running on a CentOS 5.2 host. At one time when I issued an 'init 6' in one of the XEN guests it rebooted Now it seems to halt but virt-manager shows it as still running and the only way to get the guest to boot is to destroy the virtual machine and start it again. Unfortunately I didn't notice precisely when this change in behavior occurred, I believe it was the last 'yum update' that included a new XEN kernel, but I cannot say for sure. Has anyone else noticed this change in behavior? Any solutions to restore the older behavior, being able to 'init 6' the virtual machine was very useful. Thank you, Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Multiple Linux instances on the same box - dual/triple/etc boot ?
On Fri, Sep 19, 2008 at 7:34 PM, admin [EMAIL PROTECTED] wrote: Yes, this seems like a case where virtualisation is a good solution. I've only just started learning to run Xen myself, but the advantages of virtualisation over dual/triple booting etc are pretty clear. As well as the ones you mention, different machines can also be run concurrently and networked. I have recently put virtualized xen CentOS host and guests into production, using the standard tools in CentOS 5 and all works well. Not sure about the VMServer since I haven't tried it, but with xen built into the kernel and what I've seen of the tools such as virt-manager, virt-clone, virt-image, it is very light and simple and should work well for the needs described. In in this case, I'd suggest formatting the whole disk, with a very large partition to hold xen image files, files that represent the hard-drives of the guests. While disk io in the guests is a bit slower, the flexibility should be worth it, as imaging a guest is no more difficult than a file copy. The guests can access the host's storage via NFS or Samba just as an networked host can. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] shutdown and boot on Xen
On Fri, Sep 12, 2008 at 3:37 PM, Sergio Belkin [EMAIL PROTECTED] wrote: Hi, I am using xen-3.0.3-41.el5 on Centos 5 with 2.6.18-53.1.21.el5xen kernel. I'd like to: 1) When Dom0 shutdown, DomU's do the same. This is a given. 2) When Dom0 boots. DomU's do the same. Create a soft-link in /etc/xen/auto to each DomU in /etc/xen that you want to auto-start at system boot. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] What is the minimum ISO to build a server?
On Wed, Sep 3, 2008 at 6:05 PM, Paul Rushing [EMAIL PROTECTED] wrote: also http://wiki.centos.org/FAQ/CentOS5 refers to being able to do a minimal install with only the 1st cd. I've done this, works fine. The root file system is usually about 800 MB, after manually adding a few packages, I usually end up at about 1 GB. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] General Linux query
I can only comment from my experience, which is primarily ext2 and ext3. 1) How file systeem get corrupted on linux? I've almost never seen corruption in a Linux file system, the primary reason is usually a hardware issue, the secondary reason (by far) is buggy code. 2) why,when and how fsck to be run without lossing data? fsck can never guarantee data will not be lost, it does the best it can, which is usually pretty good. Normally fsck is run in single user mode. If you want to run it manually, you'd bring the system to single user mode (init 1) or it would run automatically during boot. There is a counter in the file system as to the last time fsck was run, during boot if this exceeds a certain vaule, fsck is run. There is also a clean shutdown bit which is set during a normal shutdown/dismount, if this is not se,t which indicates a possible system crash, fsck is run during system boot. 4) what are all the precaution to be made to prevent file system corruption. Run a production distribution such as Redhat/CentOS vs. more of a bleeding edge distribution such as Fedora. More than this, assume there will be data loss or corruption at some point and take precautions such as running RAID 1, backups and use a UPS to avoid system crashes or hardware issues in the face of brown or black outs. Lastly choose a journaling file system such as ext3, use ext2 for partitions were performance over consistency is more important. 5) why when the system will get hanged and what are all the possible reasons? Usually hardware issues, particularly memory and hard drives. Most distributions come with memtest86 so that the hardware's memory can be thoroughly tested prior to installation of the operating system. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] centos on intel D945GCLF board
On Tue, Aug 19, 2008 at 9:38 AM, Janez Košmrlj [EMAIL PROTECTED] wrote: I know that disabling the LAN in BIOS works. The problem is that I need the on-board card, since I am trying to build a home router and I need 2 LAN cards for that. And the board has only one PCI slot. I had a similar problem with a similar Intel MB, it didn't crash at boot, but randomly crashed at run-time. With the LAN disabled, I did a yum update and then was able to re-enable the LAN with a newer kernel. The system has been stable for several weeks with the newer kernel. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Boot CentOS 5 to command line
On Mon, Aug 18, 2008 at 2:46 PM, ABBAS KHAN [EMAIL PROTECTED] wrote: Hi fellows, Pretty new to CentOS. I was trying to find a way to boot CentOS into command prompt instead of GUI (or without loading any services). Tried using 'Crl+Alt+F1' at the boot process, but, that holds the screen at mounting and doing fstab and doesn't proceed further. Is there anyother way to boot CentOS into command prompt without using Rescue option from the installation CD? You can change to multi-processing command line mode with 'init 3' and single user mode with the command 'init 1'. Modes can be changed dynamically in a running system. See the file /etc/inittab, it lists all the possible modes, the first line of this file defines the default mode: id:5:initdefault: which defaults to running the GUI at boot, change it to: id:3:initdefault: to not run the GUI at boot. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Lightweight MTA for XEN CentOS guests
All, For a production environment, I'd like to setup CentOS XEN guests as lightweight as possible. I'd like the XEN guests to be able to send nightly email as all CentOS servers do, but there is no reason to run a mail server as the CentOS Dom0 already has an email server running that can act as an email smart host. The options that seem most appealing to me are either ssmtp or sendmail minimally configured to only run the queuing submission agent. As far as ssmtp, I have not as yet found an CentOS RPM, presumably a Fedora RPM might be suitable. The down side of ssmtp is the lack of queuing should the smart host not be available, not likely but it is possible the email daemon could crash or be down for maintenance or other reason. As far as sendmail, it is simple to switch off the sendmail daemon and only run the queuing submission agent: 1) edit /etc/sysconfig/sendmail and set DAEMON=no 2) edit /etc/mail/submit.mc and set FEATURE(`msp', `[IP.of.relayhost]')dnl and of course add an alias for root. Does anyone on this list have experience running a minimal MTA? What other options/software should I be looking at? Any other insights, suggestions or insights? Both the Dom0 and guests are CentOS 5.2. Thanks in advance, Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba permissions problem
On Thu, Jul 17, 2008 at 6:02 AM, Kevin Thorpe [EMAIL PROTECTED] wrote: Hi all, I have a permissions problem with a samba share which I really can't fathom out. I'm trying to create a fully group writable share. Easy or so I thought. As you can see from my config I am trying all the options to set files group writable, however when I create a file from the client I'm always getting the mode 0644. Does anyone have a clue why? Thanks! client: //database.pricetrak.com/spendtrak /home/spendtrak cifs username=webserver,password=twonkerlet,uid=apache,file_mode=0660,dir_mode=0770 0 0 server: [spendtrak] comment = Spendtrak Files path = /home/spendtrak browseable = no writable = yes printable = no valid users = +spendtrak force group = spendtrak create mode = 0660 create mask = 0660 force create mode = 0660 directory mode = 0770 I have this working with: [example] path = /home/example writeable = yes browseable = yes create mask = 0775 force create mode = 0775 directory mask = 0775 force directory mode = 0775 Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] 2.6.18-92.1.6.el5xen hangs Samba daemon
On Fri, Jun 27, 2008 at 2:43 PM, Brett Serkez [EMAIL PROTECTED] wrote: On Fri, Jun 27, 2008 at 1:59 PM, Anne Wilson [EMAIL PROTECTED] wrote: I'm running 2.6.18-92.1.6.el5.bz_pre53 and samba is working for me. There was an rpmnew question during the update. Could that be the problem? I run into the problem with: 2.6.18-92.1.6.el5xen, the xen version of the kernel. Just to re-verify the issue, I rebooted back to the above kernel and this time Samba starts right up no problem! I had tried this earlier and it did not. I'll have to keep an eye on it over time and see if the behavior changes again. Just as a follow up, after a reboot (without any updates) the network on this system fails to start. Either the kernel or system seems unstable, given this is a brand new system I suspect the kernel, I'll have to go on-site to further investigate. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] 2.6.18-92.1.6.el5xen hangs Samba daemon
On Fri, Jun 27, 2008 at 1:59 PM, Anne Wilson [EMAIL PROTECTED] wrote: I'm running 2.6.18-92.1.6.el5.bz_pre53 and samba is working for me. There was an rpmnew question during the update. Could that be the problem? I run into the problem with: 2.6.18-92.1.6.el5xen, the xen version of the kernel. Just to re-verify the issue, I rebooted back to the above kernel and this time Samba starts right up no problem! I had tried this earlier and it did not. I'll have to keep an eye on it over time and see if the behavior changes again. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] LDAP syncrepl incompatibility between CentOS 4.x and 5.x
There is an openldap in the CentOS Testing repo for centos-4 that will work with centos-5. It has a compat-openldap-c4_version for the things that are compiled against the c4 version ... and i am using it in production and syncing c5 and c4. This works great! Thanks for the tip, this is just what I was looking for. However, it is a couple updates behind. The version is openldap-2.3.27-4.el4.centos This is the same version as CentOS 5, perfect. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] LDAP syncrepl incompatibility between CentOS 4.x and 5.x
All, After many hours of research I have found there is a incompatibility between OpenLDAP V2.3.x and V2.2.x, or atleast between V2.3.27 the current version on CentOS V5 and V2.2.13 the current version on CentOS V4. The syncrepl feature of OpenLDAP, to keep multiple slapd servers sync'd, was working between CentOS 4 and 5 at one time, as that is how I populated the slave servers. I've found references indicating protocol changes and incompatibilities between these versions and indeed looking at detailed debugging logs I can see the protocol falling apart between the two versions. Has anyone else seen this issue? Is anyone aware of a fix in the pipeline or a work around? Thanks in advance, Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] LDAP syncrepl incompatibility between CentOS 4.x and 5.x
On Wed, Jun 11, 2008 at 6:24 PM, Craig White [EMAIL PROTECTED] wrote: That said, I don't recall syncrepl ever working in 2.2.x and have used slurpd for replicating with 2.2 but if the OP says he thinks he had it running, well, I'm not gonna argue with him. syncrepl 2.2.x works fine between CentOS 4 systems as installed via yum. I just used this today, made changes on the master that I needed on to use on the slave, the replication was instant. The issue is between 2.2.x and 2.3.x. What I said I thought worked was replication from CentOS 4.x to CentOS 5.x (ie. 2.2.x - 2.3.x), as when I brought the CentOS 5.x on-line and started slapd, the LDAP database was almost instantly available. I never used any other method to load the LDAP data on the CentOS 5.x system from the CentOS 4.x master. It is only recently that I noticed the replication failing, I believe after a recent yum update. I have looked at using yum to regress the version of LDAP on the CentOS 5.x system, but it seems I needed to have turned on a yum option before the update to do this. I also noticed all the dependencies as far as trying to build myself. My assumption is that eventually newer versions of LDAP will be available that will work. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsync - set owner and group?
On Fri, May 9, 2008 at 10:38 AM, Sean Carolan [EMAIL PROTECTED] wrote: Is there a way to force rsync to set a specific owner and group on destination files? I have managed to get the permissions set up the way I want, but the owner and group are still defaulting to a numeric id instead of the correct owner and group. Do your user and group names on both your source and destination systems have matching numeric values? Linux/UNIX systems carry the numeric values and look up the text values in /etc/passwd and /etc/group for display. If you are seeing numeric values, that would imply there are no matching entries in those files. If you adjust your numeric values for the owner and group to match on source and destination systems, your systems will match up. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] read only root file system
On Fri, May 2, 2008 at 12:16 AM, Jason Pyeron [EMAIL PROTECTED] wrote: I am looking at having a read only box, it will not use a swap partition. Any recommendations? You'll need to break out your hard drive into multiple partitions, as there are certain portions of the file system that need to be writable such as /var and /home. I setup systems in this manner to make them more difficult to subvert, I'd suggestion searching for topics such as linux file system hardening. When you do need to do maintenance, such as package management, you'll need to remount the root file system as writable which will likely require a reboot. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] read only root file system
On Fri, May 2, 2008 at 9:38 AM, Ralph Angenendt [EMAIL PROTECTED] wrote: Brett Serkez wrote: On Fri, May 2, 2008 at 12:16 AM, Jason Pyeron [EMAIL PROTECTED] wrote: I am looking at having a read only box, it will not use a swap partition. Any recommendations? You'll need to break out your hard drive into multiple partitions, as there are certain portions of the file system that need to be writable such as /var and /home. I setup systems in this manner to make them more difficult to subvert, I'd suggestion searching for topics such as linux file system hardening. What do you do with /etc/mtab - where the system clearly wants to write into when you mount/unmount stuff? Make it a soft-link to /var or other writable file system, perhaps /etc/mtab - /var/etc/mtab. For the most part the Linux/UNIX file system is broken up into well defined areas, but alas, exceptions need to be dealt with. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Total novice
Edit ./etc/fstab and comment out the mount entry for that drive with a '#' in the first position of the line. Brett On Nov 25, 2007 11:07 AM, Manuel Leon [EMAIL PROTECTED] wrote: Hi. I want to remove one of three hard drives. But if I just remove the disk, Linux signals errors and enters administrative mode requesting corrective actions which, of course, I do not know. If I reconnect the drive, everything returns to normality. Can anyone help me? Thanks in advance. MLM ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Permissions question
Todd, On 10/1/07, Todd Cary [EMAIL PROTECTED] wrote: My www directory is owned by apache and the group is todd and the permissions are 775. My Windows computers use Samba and they log into Linux with todd. Under the www directory there are various directories which may have a group belonging to a user e.g. viewpoint. Using this example, there is a directory under www (acutally called httpd), viewpoint that is owned by apache and is a member of the viewpoint group. todd is also a member of the viewpoint group. Now this is the problem I do not know how to correct: if todd using Samba creates a directory in viewpoint, the owner and group is todd with 755 permissions. Now if the viewpoint user tries to write to the directory, he does not have adequate permissions. Maybe I have not setup the owners and groups correctly. maybe there is something I need to do with how Samba interacts with the server. When files/folders are created on a UNIX/Linux system, all permission bits set minus your umask, which is usually 022. In your case, 777 - 022 = 755.Just type umask at a command prompt to see your umask value. umask is set during system login and inherited during process creation. You could change your system wide login's umask setting from 022 to 002 which would change the default to 755 for all new files and folders created on the system. A better alternate for you might be to specify an override in your samba configuration for the specific share, I've found these settings work best: [Example] path = /home/Example create mask = 0775 force create mode = 0775 directory mask = 0775 force directory mode = 0775 ... Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Multiple IP Address
I have only assumed it is the address that matches it's host name, which is why I always configure that in the /etc/hosts file. Right, one would think so, but this doesn't seem to effect this behavior either. Shutting down and start up OpenVPN immediately effects the behavior, indicating this behavior is dynamic. I've been searching for a way to effect this behavior, perhaps in a configuration file (/etc/sysconfig... or /proc/...) with no luck so far. Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Multiple IP Address
I have only assumed it is the address that matches it's host name, which is why I always configure that in the /etc/hosts file. Right, one would think so, but this doesn't seem to effect this behavior either. Shutting down and start up OpenVPN immediately effects the behavior, indicating this behavior is dynamic. I've been searching for a way to effect this behavior, perhaps in a configuration file (/etc/sysconfig... or /proc/...) with no luck so far. I should have asked this, but what do you mean by the default IP on a multi-homed host? It is not multi-homed, as described in my initial post. It has only one ethernet card with a single IP address. The problem comes in when running OpenVPN which adds two virtual adapters, each with a unique IP address (i.e., 10.55.5.x and 10.55.6.x). When OpenVPN is stopped, all works fine, it is only with OpenVPN running that the server starts using one of the IPs from the last virtual adapter as its IP address, in some cases. I am unsure whether there is a default IP at all and the routing table decides which interface depending on the source and destination IP addresses used on the host. OpenVPN does modify the routing table, but only for the specific subnet routing, ie. 10.55.5.0/24 and 10.55.6.0/24. The problem is that when a Windows desktop is OpenVPN connected to another CentOS system on the same local network as the subject server on an unrelated subnet ( i.e. 10.55.3.0/24) it is given the subject server's 10.55.6.x address vs. the ethernet 10.44.0.x address, which would work perfectly. So from a Windows workstation on the local subnet, if I ping CentOServer I get 10.44.0.x, which is what I want. If I am on the Windows desktop VPN connected to the other CentOS server on subnet 10.55.3.0/24 and I ping CentOSServer I get 10.55.6.x vs the 10.44.0.x I would have expected. There should be no relationship between the originating Workstation's IP and the IP it is given for CentOServer, but there is, I am trying to understand why if there is a way to change this behavior. Is this any clearer? Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Multiple IP Address
I'm hoping that someone on this list can shed some light on how Linux/CentOS decides which IP address to report when a Windows desktop attempts to access it via SAMBA/WINS. The CentOS system in question is running a single NIC and OpenVPN which adds two additional virtual NICs. This is a backup system, there is another CentOS system that acts as the primary VPN server. The local NIC is 10.44.0.0/24, the virtual NICs are 10.55.5.0/24 and 10.55.6.0/24, respectively. If a Windows Desktop on the local network attempts to contact this CentOS server, it is given its 10.44.0.x address. If a Windows Desktop is VPN connected to the primary CentOS VPN server, with a 10.55.3.x address, it is given this CentOS server's 10.55.6.x address. It seems the IP address of the requester is being taken into account, perhaps looking for the closest subnet match? Ultimately I'd like the CentOS system to always report its 10.44.0.x address. Is there anyway to force this behavior? Brett ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
