Re: [CentOS] Virtualization software to install Windows as guest on CentOS 5 as host ?
Christopher Chan wrote: On Thursday, February 04, 2010 03:48 PM, Hadi Motamedi wrote: Dear All I need to install Windows as guest on my CentOS 5 as host . Can you please give me the link to download the requierd rpm package for this purpose ? Thank you yum install kvm Then search for virtio drivers. Redhat provides virtio block drivers for Windows Vista, 7, 2008. What benefits may provide me the virtio drivers ? Also what suggestions do you have about running win2k3, win2k8 server as a guests on CentOS5 kvm host ? I'm interesting about disk organization for guest OS at first. Thx! ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] how to debug random server reboots
Rudi Ahlers пишет: Hi all, One of our CentOS 5.3 randomly reboots, at different times of the day, and I can't see why it's doing it. I have looked through the logs, but don't see any thing in there that shows me why it has rebooted. How can I debug this? Hi, try to enable kdump to get kernel dump, if this software-related issue. http://download.swsoft.com/virtuozzo/virtuozzo4.0/docs/en/lin/VzLinuxUG/20027.htm Using Kexec and Kdump For System Troubleshooting yum install kexec-tools edit /etc/grub.conf and append to the end of the kernel line: crashkernel=1...@16m chkconfig kdump on reboot Also look this: http://kbase.redhat.com/faq/docs/DOC-6039 How do I configure kexec/kdump on Red Hat Enterprise Linux 5? http://kbase.redhat.com/faq/docs/DOC-2119 How can I voluntarily crash my machine to test if netdump/diskdump/kdump I configured works? http://kbase.redhat.com/faq/docs/DOC-5413 My server crashes once in awhile. How can I debug it? http://kbase.redhat.com/faq/docs/DOC-1742 My system has started to hang randomly. What information does Red Hats technical support need to diagnose the problem? http://kbase.redhat.com/faq/docs/DOC-10828 My Red Hat Enterprise Linux 2.1 system had a kernel panic, an oops message, or is freezing for no apparent reason. How can I find out what is causing this? Next, I recommend you setup and run memtest86+.x86_64 : Stand-alone memory tester for x86 and x86-64 computers You should ask the support to reboot machine for a night and chose the memtest in grub loader. If DC has ipkvm - ask it. Also what a network card on your server ? I had some troubles with non-brand network card.. -- Best wishes, Sergej Kandyla Всегда улыбайтесь жизни и жизнь всегда улыбнется вам! ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Kernel message - Disabling IRQ #50
Hi all! After booting the server I have this message: irq 50: nobody cared (try booting with the irqpoll option) Call Trace: IRQ [800c17e6] __report_bad_irq+0x30/0x7d [800c1a19] note_interrupt+0x1e6/0x227 [800c0f15] __do_IRQ+0xbd/0x103 [8006e249] do_IRQ+0x13f/0x14d [8006ca05] default_idle+0x0/0x50 [80060665] ret_from_intr+0x0/0xa EOI [8006ca2e] default_idle+0x29/0x50 [8004b45d] cpu_idle+0x77/0x96 [803f3826] start_kernel+0x240/0x245 [803f3237] _sinittext+0x237/0x23e handlers: [801df6c6] (usb_hcd_irq+0x0/0x55) Disabling IRQ #50 # cat /proc/interrupts CPU0 CPU1 0: 100127 89815252IO-APIC-edge timer 1:144 82IO-APIC-edge i8042 7: 0 0IO-APIC-edge parport0 8: 0 1IO-APIC-edge rtc 9: 0 0 IO-APIC-level acpi 12: 2783 1158IO-APIC-edge i8042 50: 82343 17657 IO-APIC-level ehci_hcd:usb2 58: 0 87 IO-APIC-level ohci_hcd:usb3, HDA Intel 66: 0 0 IO-APIC-level ohci_hcd:usb4 98: 14065984 0 PCI-MSI eth0 233: 343943 698091 IO-APIC-level ehci_hcd:usb1, ahci NMI: 2027 2500 LOC: 89901484 89901412 ERR: 0 MIS: 0 Server works normal, but what should I do with this ? Disable a USB support ? Hardware: Asus M2N-VM DVI, Athlon X2 4800+, 6G DDR2 Centos 5.3 x86_64 If you wish, dmesg here: http://paix.org.ua/tmp/dmesg_270509.txt Thanks!. -- Best wishes, Sergej Kandyla ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Kernel message - Disabling IRQ #50
Ralph Angenendt пишет: Sergej Kandyla wrote: Hi all! After booting the server I have this message: irq 50: nobody cared (try booting with the irqpoll option) ^ Oh, thanks... currently I don't see this message after reboot with irqpoll. Could you advice about second issue. When booting I see powernow-k8: Pre-initialization of ACPI failed powernow-k8: Found 1 AMD Athlon(tm) 64 X2 Dual Core Processor 4800+ processors (2 cpu cores) (version 2.20.00) powernow-k8: Your BIOS does not provide _PSS objects. PowerNow! does not work on SMP systems without _PSS objects. Complain to your BIOS vendor. powernow-k8: Your BIOS does not provide _PSS objects. PowerNow! does not work on SMP systems without _PSS objects. Complain to your BIOS vendor. I googled and find next advice: This is displayed because the CPU frequency scaling is disabled. Enable it by setting the AMD Cool 'n' Quiet Function in the BIOS settings to Auto and that warning will disappear. (You'll find it in Advanced-CPU Configuration) But I think that I don't need the CPU frequency scaling on the server. What is the best solution? Never mind about this message ? Thanks in advice. -- Best wishes, Sergej Kandyla ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] iptables rules to limit attack, connlimit
Kai Schaetzl пишет: There are numerous tutorials out there how to use ratelimiting. Just google. Kai Does anyone know how to implement some functional provided by patch-o-matic without patching the kernel ? centos5.2 box # iptables -A INPUT -p tcp --syn --dport 80 -m connlimit --connlimit-above 15 -j REJECT iptables: Unknown error 4294967295 The idea is to limit established connections for every unique ip. This very helpful on the high-loaded web servers. May be some alternatives ? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] clustering and load balancing Apache, using nginx
Les Mikesell пишет: Sergej Kandyla wrote: nginx http_proxy module is universal complex solution. Also apache working in prefork mode (in general cases), I don't know does mod_jk\mod_proxy_ajp works in the worker-MPM mode... In the preforking mode apache create a child on each incoming request, so it's too much expensive for resource usage. Have you actually measured this? Preforking apache doesn't fork per request, it forks enough instances to accept the concurrent connection count plus a few spares. Each child would typically handle thousands of requests before exiting and requiring a new fork - the number is configurable. Sorry for bad explanation. I meant that apache create a child (above MinSpareServers) for serving each new unique client. I measured nginx in real life :) On some server (~15k uniq hosts per day, ~ 100k pageviews, and with 1-3k concurrent tcp established connections ) with frontend(nginx) - backend (apache + phpfastcgi) architecture I turned off nginx proxing and server go away for a minute... apache forked to MaxClients (500) and took all memory. Also nginx helped me protect from low-medium DDoS. When apache forked to maxclients, nginx could server many thousand concurrent connections. So I've wrote shell scripts to parse nginx logs and put IPs of bots to firewall table. Therefore I find nginx (lighttpd also a good choose) enough efficient (at least for me). Off course you should understand what you expecting from nginx, what it can do and what can't. If you want real world measurements or examples of using nginx on heavy loaded sites please to google. Also you could ask in the nginx at sysoev.ru mail list (EN). Also apache spend about 15-30Kb mem for serving each tcp connection at this time nginx only 1-1.5Kb. If you have, for example, abount 100 concurrent connections from different IPs there is nearly 100 apache forks... it's too expensive. A freshly forked child should have nearly 100% memory shared with its parent and other child instances. Please tell me how much resources you should have for revers proxing with apache for example nearly 1k-2k unique clients ? What cpu load and memory usage will you have? I think that apache is great software. It's very flexible and features rich, but it especially good as backend for dynamical applications (mod_php, mod_perl, etc.) If you need to serve many thousand concurrent connections you should look at nginx, lighttpd, squid, etc.. IMHO. http://www.kegel.com/c10k.html As things change, this will decrease, but you are going to have to store the unique socket/buffer info somewhere whether it is a copy-on-write fork or allocated in an event-loop program. If you run something like mod_perl, the shared memory effect degrades pretty quickly because of the way perl stores reference counts along with its variables, but I'd expect the base apache and most module code to be pretty good about retaining their inherited shared memory. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] clustering and load balancing Apache, using nginx
Rainer Duffner пишет: Sergej Kandyla schrieb: Hi, apache is good as backend server for dynamic applications. You could use something like nginx, haproxy as frontend for balancing multiple backend servers. I'm using nginx. This light web server could serve many thousand concurrent connections! It works great! look at http://wiki.codemongers.com/NginxLoadBalanceExample http://blog.kovyrin.net/2006/08/25/haproxy-load-balancer/lang/en/ http://blog.kovyrin.net/2006/05/18/nginx-as-reverse-proxy/lang/en/ and http://highscalability.com/ Yup. NGINX is probably the fastest way to serve content nowadays. But content has to be static and be available as a file (AFAIK) directly to NGINX. No, nginx could serve any kind of content via ngx_http_proxy_module module http://wiki.codemongers.com/NginxHttpProxyModule For example I'm using nginx as reverse proxy for tomcat servers\applications. Also I've wrote some article about using nginx in shared hosting sphere. Look at http://directadmin.com/forum/showthread.php?t=27344 When content located on the some server (or via NAS\SAN) nginx could serve this content directly using some efficient mechanisms like sendfile http://wiki.codemongers.com/NginxHttpCoreModule#sendfile For serving static content nginx even more times efficient than ftp!! On some servers with low-power hardware like celeron\sempron processors and 512M ram I have upload rate nearly 100mbit, It's not limit for nginx, its a limit of sata disks and chanel to that servers :) As for load-balancing: http://wiki.codemongers.com/NginxHttpUpstreamModule http://barry.wordpress.com/2008/04/28/load-balancer-update/ There's also varnish, if you can't meet the above provision easily. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] clustering and load balancing Apache
Florin Andrei пишет: Sergej Kandyla wrote: apache is good as backend server for dynamic applications. You could use something like nginx, haproxy as frontend for balancing multiple backend servers. I'm using nginx. This light web server could serve many thousand concurrent connections! It works great! In addition to the user-space solutions mentioned above, there are also kernel-level solutions, such as Linux Virtual Server, or LVS: http://www.linuxvirtualserver.org/ IMHO it's not right compare light web server with Virtual servers. Look at http://www.linuxvirtualserver.org/whatis.html In this scheme you could naturally use nginx as loadbalancer on the Load Balancer Linux Box. Also The mission of the project is to build a high-performance and highly available server for Linux using clustering http://en.wikipedia.org/wiki/Computer_cluster technology, which provides good scalability, reliability and serviceability. If you need high-availability you could also use XEN\KVM or OpenVZ. These technologies are actively developing... XEN\KVM are supported natively in the RHEL\Centos kernel. I'm prefer OpenVZ as light-weight virtualization. http://wiki.openvz.org/HA_cluster_with_DRBD_and_Heartbeat I am under the impression that, speaking in general, user-space balancers provide more features (are smarter), while the kernel-space ones are faster (provide more in terms of raw speed and max load). I could be wrong. Can anybody provide a performance comparison between, say, nginx and LVS? (max connections, max new connections rate, max bandwidth, max packets per second, etc.) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] clustering and load balancing Apache, using nginx
Les Mikesell пишет:
Sergej Kandyla wrote:
No, nginx could serve any kind of content via ngx_http_proxy_module
module http://wiki.codemongers.com/NginxHttpProxyModule
For example I'm using nginx as reverse proxy for tomcat
servers\applications.
Is there some advantage to this over apache with mod_jk?
afaik mod_jk is only available for RHEL4\Centos4 i.e apache 2.0 (of
course you could compile it manually for apache 2.2 coming with centos5)
So, recommended way for centos5 (apache 2.2) is using mod_proxy
(mod_proxy_ajp)
nginx http_proxy module is universal complex solution. Also apache
working in prefork mode (in general cases), I don't know does
mod_jk\mod_proxy_ajp works in the worker-MPM mode...
In the preforking mode apache create a child on each incoming request,
so it's too much expensive for resource usage. Also apache spend about
15-30Kb mem for serving each tcp connection at this time nginx only
1-1.5Kb. If you have, for example, abount 100 concurrent connections
from different IPs there is nearly 100 apache forks... it's too expensive.
If you don't need full power of apache flexibility as server for dynamic
applications, why use it for simple job such as proxing ?
So, I think nginx is great as light frontend server.
example config for proxing to tomcat backend:
location / {
rewrite ^/$ /tomcatapp/ redirect;
}
location /tomcatapp {
proxy_pass http://localhost:8080/tomcatapp;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 120;
proxy_send_timeout 120;
proxy_read_timeout 180;
}
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Re: [CentOS] clustering and load balancing Apache
Anto Marky пишет: Hi, I am new to clustering and loadbalancing in apache, What is best way of doing it? How do I do the clustering and what tools do I need to use? Do I have those tools, I use CentOS , Do i have any tools in CenOs which comes default in it? And how do I do apache load balancing? should I rely on apache forums or mailing list or is there any way or tool I can use in CentOS? Can any throw some vague Idea on how to do it so that I start reading documents before I do it? Hi, apache is good as backend server for dynamic applications. You could use something like nginx, haproxy as frontend for balancing multiple backend servers. I'm using nginx. This light web server could serve many thousand concurrent connections! It works great! look at http://wiki.codemongers.com/NginxLoadBalanceExample http://blog.kovyrin.net/2006/08/25/haproxy-load-balancer/lang/en/ http://blog.kovyrin.net/2006/05/18/nginx-as-reverse-proxy/lang/en/ and http://highscalability.com/ Another issue is keeping content synchronizing between apache servers. There are several solutions: NAS\SAN or programbased DRBD http://en.wikipedia.org/wiki/DRBD. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Tomcat Monitoring
Sean Carolan wrote: What do you use for monitoring your Apache Tomcat servers? I have used jconsole to manually connect and look at the statistics. I'm wondering if there are any standard tools for watching the health of the java process. Hi, I'm interesting too in tomcat monitoring. Some times i have a problems with java, for example i get java.lang.OutOfMemoryError some idea is monitor catalina.out log for such errors, but may be there are a standard tools for java monitoring\restarting. -- Best Wishes, PAIX-UANIC | SK3929-RIPE ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ZFS on Linux
Mag Gam wrote: I am planning to use ZFS on my Centos 5.2 systems. The data I am storing is very large text files where each file can range from 10M to 20G. I am very interested on the compression feature of ZFS, and it seems no other native Linux FS supports it. My question are: Is ZFS stable? How does it scale for very large filesytems, ie, 2TB to 9TB? How is the performance of fuse? I plan to use it on my archive server first, so data reliability is very important Any thoughts or ideas? Did you look at Ext4 ? http://en.wikipedia.org/wiki/Ext4 The ext4 filesystem can support volumes with sizes up to 1 exbibyte and files with sizes up to 16 TiB At least for linux it looks better that ZFS via fuse. -- Best Wishes, PAIX-UANIC | SK3929-RIPE ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] suspend/resume system crash
Hi all, I've installed CentOS 5.2 i386 (with all updates) on notebook Fujutsu Siemens Esprimo U9200 Suspending works normal, but after resuming my system crashes. There are no messages about that in /var/log/messages, only after reboot system I see in gnome: Resume Problem Your system did not appear to resume correctly from Suspend/Hibernate. This may be a driver problem or a hardware problem. Check the GNOME Power Manager Manual for common problems. Other hardware works normal, my lspci: # lspci 00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03) 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 03) 00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 03) 00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 (rev 03) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3) 00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 03) 00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 03) 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03) 04:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E Gigabit Ethernet Controller (rev 14) 06:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg Wireless PCI Express Adapter (rev 04) model name : Intel(R) Pentium(R) Dual CPU T2390 @ 1.86GHz MemTotal: 2066004 kB Could you give me some advice how to fix suspend\resume ? Thanks ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] suspend/resume system crash
Hi all, I've installed CentOS 5.2 i386 (with all updates) on notebook Fujutsu Siemens Esprimo U9200 Suspending works normal, but after resuming my system crashes. There are no messages about that in /var/log/messages, only after reboot system I see in gnome: Resume Problem Your system did not appear to resume correctly from Suspend/Hibernate. This may be a driver problem or a hardware problem. Check the GNOME Power Manager Manual for common problems. Other hardware works normal, my lspci: # lspci 00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03) 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 03) 00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 03) 00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 (rev 03) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3) 00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 03) 00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 03) 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03) 04:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E Gigabit Ethernet Controller (rev 14) 06:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg Wireless PCI Express Adapter (rev 04) model name : Intel(R) Pentium(R) Dual CPU T2390 @ 1.86GHz MemTotal: 2066004 kB Could you give me some advice how to fix suspend\resume ? Thanks ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] suspend/resume system crash
Max Hetrick wrote: Sergej Kandyla wrote: I've installed CentOS 5.2 i386 (with all updates) on notebook Fujutsu Siemens Esprimo U9200 Suspending works normal, but after resuming my system crashes. There are no messages about that in /var/log/messages, only after reboot system I see in gnome: I have a ThinkPad, but I've never been able to get suspend/resume to work right with CentOS. Hibernation, however, worked fine for me until I started using disk encryption. Now, it too bombs because it can't wake up my encrypted file systems. Have you tried seeing if hibernation works? I know it's not the same, but I know I've never had a laptop that suspend/resume worked when using CentOS. Thanks for reply! Yes, hibernation (sleep mode) works fine... I'm confused... Not only my freebsd can't work with all hardware :) ( Off course I understand that CentOS is server oriented linux, but I want use on desktop such system that I'm using on my servers. ) Also I've tried update gnome-power-manager-2.16.0-9.el5 to gnome-power-manager-2.18.2-4.fc7.i386.rpm but this didn't take a results. -- Best Wishes, PAIX-UANIC | SK3929-RIPE ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Cleaning centos to minimal set of RPMS
Hi, I want to clean a centos box to get minimal (initial) set of packages. How I can remove all RPMS excluding minimal required RPMS ? Thanks in advice! ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Backup and reinstall a CentOS server
Marco Fretz wrote:
If you want to copy the whole server, use cpio. We use this to convert
phys servers to virtual.
find / | cpio -o -Hnewc | ssh -c blowfish remote server cpio -u -i -m
-d -Hnewc
Also you could use dump\restore utilites
mount /dev/hdb1 /mnt/hdb1
cd /mnt/hdb1
dump -0uan -f - /boot | restore -r -f -
http://linuxscrew.com/2007/08/13/move-linux-to-another-hard-drive-dump-restore-backup/
- Any suggestions on BIND to log queries without SELINUX throwing a fuss?
You could use dns logining.
some example from one of my servers:
options {
.
};
logging {
channel default_log {
file /var/log/named.log size 5k;
severity info;
print-time yes;
print-category yes;
print-severity yes;
};
channel more_log {
file /var/log/named_extend.log size 2k;
severity info;
print-time yes;
print-category yes;
print-severity yes;
};
category default { default_log; };
category xfer-in { default_log; };
category xfer-out { default_log; };
category notify { default_log; };
category network { default_log; };
category security { more_log; };
category resolver { more_log; };
category client { more_log; };
category unmatched { more_log; };
category database { more_log; };
category lame-servers { null; };
category queries { more_log;};
};
--
Best Wishes,
PAIX-UANIC | SK3929-RIPE
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Re: [CentOS] Control IO related to a process
Lorenzo Quatrini wrote: Lorenzo Quatrini ha scritto: nice 19 dd if=/xxx of=/xxx bs=nnn ^^ probably - nice 19 dd if=/xxx of=/xxx bs=nnn + nice -n 19dd if=/xxx of=/xxx bs=nnn -- Best Wishes, PAIX-UANIC | SK3929-RIPE ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] upgrade Fedora - Centos
Hi all, Is there some way to upgrade from Fedora Core 6 to Centos 5 (on remote serv) ? Thanks in advice! -- Best Wishes, PAIX-UANIC | SK3929-RIPE ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] raid 1 ( mirroring ) after installation
Mail Administrator wrote: Dear All, i have instlled centos 5.1 nd has been workin perfect. i would like to implemnt raid 1 now (mirroring) how do i acheive this on a installed system apprecite your help or some helpful links look _http://www.linuxconfig.org/Linux_Software_Raid_1_Setup_ _http://www.howtoforge.com/software-raid1-grub-boot-debian-etch_ _http://tldp.org/HOWTO/Software-RAID-HOWTO.html_ regards simon -- Wbr, SK ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] MySQL 4.1 on Centos 5 ?
Sergej Kandyla wrote: Hi All, Could anyone tell me, how to correctly install MySQL4.1 on Centos 5 ? Thanks, all! The problem is solved. Also I've tried to run our application on default centos mysql5, but have some errors with sql queries. In our application used very big, long and difficult sql queries, and they don't work after updating to mysql5. I've tried to compile mysql4.1.22 and 4.1.20 by hand too, but also have errors. I've compiled with only options --prefix=/usr/local/mysql4 --exec-prefix=/usr/local/mysql4 All compiled ok, and works seems ok, but our application still not work correctly. I don't have ideas about this matter. May be some specific options required...I don't know. In the end, I've downloaded precompiled mysql 4.1.22 (http://dev.mysql.com/downloads/mysql/4.1.html#linux-x86-32bit-rpms) unpacked it to /usr/local/mysql4, made some changes in mysql4 startup script, started... and all seems working fine now :) . PS. sorry for my EN. -- Wbr, SK ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] MySQL 4.1 on Centos 5 ?
Hi All, Could anyone tell me, how to correctly install MySQL4.1 on Centos 5 ? By default Centos 5 comes with mysql5… If I will compile mysql4 from sources to separate prefix, some features may be unavailable (unix sockets for example). I’m moving some critical application (online booking) based on java, tomcat5, mysql4.1 from old server fedora 4 to new server running Centos 5. So, I don’t want update mysql to new version this time. Thanks, SK ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] MySQL 4.1 on Centos 5 ?
Mogens Kjaer wrote: Sergej Kandyla wrote: .. I’m moving some critical application (online booking) based on java, tomcat5, mysql4.1 from old server fedora 4 to new server running Centos 5. So, I don’t want update mysql to new version this time. Why not go for Centos 4? I don’t want use outdated software and operation system, also I try not use testing distribs\soft in production. Centos (5), Debian stable (Etch), FreeBSD stable (6.3, 7.0) – it’s my choose. Currently mysql4 is temporary solution. I must complete the migration of server at first. Second, developers of the application not sure, that all will work correctly under mysql5. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
