Re: [Users] Centos/RHEL 7
On Tue, Jul 8, 2014 at 12:08 AM, jjs - mainphrame j...@mainphrame.com wrote: I'm downloading Centos 7 now. Naturally I'm eager to run openvz. Is there any sort of road map or schedule for the availability of a RHEL 7 based OVZ kernel? I guess many people are still waiting for an answer from the OpenVZ devs regarding support of a more recent kernel then 2.6.32, in this case 3.10 if I am not mistaken. -- Benjamin Henrion bhenrion at ffii.org FFII Brussels - +32-484-566109 - +32-2-4148403 In July 2005, after several failed attempts to legalise software patents in Europe, the patent establishment changed its strategy. Instead of explicitly seeking to sanction the patentability of software, they are now seeking to create a central European patent court, which would establish and enforce patentability rules in their favor, without any possibility of correction by competing courts or democratically elected legislators. ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] CentOS 7 OS Template now in contrib
On Mon, Jul 7, 2014 at 10:22 PM, Scott Dowdle dow...@montanalinux.org wrote: Greetings, CentOS sent out an announcement about the release of CentOS 7: http://lists.centos.org/pipermail/centos-announce/2014-July/020393.html I built a regular and a minimal OS Template and have uploaded it to contrib. Inside of /root are the scripts to create the OS Template from scratch. It assumes it is being built from a CentOS 7 host/container that has the CentOS repos configured correctly. I think at some point Openvz.org should provide trusted builds like docker is doing. At least we could get good docs on how those images are built. -- Benjamin Henrion bhenrion at ffii.org FFII Brussels - +32-484-566109 - +32-2-4148403 In July 2005, after several failed attempts to legalise software patents in Europe, the patent establishment changed its strategy. Instead of explicitly seeking to sanction the patentability of software, they are now seeking to create a central European patent court, which would establish and enforce patentability rules in their favor, without any possibility of correction by competing courts or democratically elected legislators. ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
[Users] strange reboot when starting a VE on a kernel 2.6.32-042stab084.26
Hi, I have a host node that only works with kernels up to and including 2.6.32-042stab084.26. Any kernel higher than that and the host reboots during vzctl start after The container has been mounted message. There is no oops, no logs (netconsole is configured and running), no crash dump, nothing, just a reboot. To make things more interesting, if I boot the debug kernel, everything works fine as far as I can tell. Any idea how do I debug this further? regards, ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
[Users] flashcache
Hi, is anyone using flashcache vith openvz? If so, which version and with which kernel? Versions lower than 3 do not compile against the latest el6 kernel and version 3.11 and the latest git oopses in flashcache_md_write_kickoff with a null pointer. I see provisions to detect ovz kernel source in flashcache makefile, so someone must be compiling and using it. Any other SSD caching software that works with openvz? regards, ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] strange reboot when starting a VE on a kernel 2.6.32-042stab084.26
Aleksandar Ivanisevic aleksan...@ivanisevic.de writes: [...] To make things more interesting, if I boot the debug kernel, everything works fine as far as I can tell. Any idea how do I debug this further? Eh, it looks like a kernel update kicked in while I was testing, so I was loading a debug kernel 2.6.32-042stab092.1, while testing with regular 090.5 kernel. So, it seems that this issue has been fixed in 092.1. -- Ti si arogantan, prepotentan i peglaš vlastitu frustraciju. -- Ivan Tišljar, hr.comp.os.linux ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
Hi all! I thought it's really not good idea because technology like ssd caching should be tested _thoroughly_ before production use. But you could try it with simfs but beware of ploop because it's really not an standard ext4 with custom caches and unexpected behaviour in some cases. On Tue, Jul 8, 2014 at 1:59 PM, Aleksandar Ivanisevic aleksan...@ivanisevic.de wrote: Hi, is anyone using flashcache vith openvz? If so, which version and with which kernel? Versions lower than 3 do not compile against the latest el6 kernel and version 3.11 and the latest git oopses in flashcache_md_write_kickoff with a null pointer. I see provisions to detect ovz kernel source in flashcache makefile, so someone must be compiling and using it. Any other SSD caching software that works with openvz? regards, ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users -- Sincerely yours, Pavel Odintsov ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] strange reboot when starting a VE on a kernel 2.6.32-042stab084.26
On 07/08/2014 02:02 PM, Aleksandar Ivanisevic wrote: Aleksandar Ivanisevic aleksan...@ivanisevic.de writes: [...] To make things more interesting, if I boot the debug kernel, everything works fine as far as I can tell. Any idea how do I debug this further? Eh, it looks like a kernel update kicked in while I was testing, so I was loading a debug kernel 2.6.32-042stab092.1, while testing with regular 090.5 kernel. So, it seems that this issue has been fixed in 092.1. According to description, it looks similar to openvz bug 2983 (with duplicates 2973,3004 and 3010) https://bugzilla.openvz.org/show_bug.cgi?id=2983 Fixed in 91.4 and in last released kernel 092.1 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
I am actually planning on using it only on test systems where i have commodity SATA disks that are getting a bit overwhelmed. I hope to get better value from a SATA+SSD combination that I would with SAS disks and the appropriate controllers and fancy RAID levels that cost 3 times more at least. Anyway, looks like that bug also got fixed in 092.1, at least it doesn't oops immediately any more. Pavel Odintsov pavel.odint...@gmail.com writes: Hi all! I thought it's really not good idea because technology like ssd caching should be tested _thoroughly_ before production use. But you could try it with simfs but beware of ploop because it's really not an standard ext4 with custom caches and unexpected behaviour in some cases. On Tue, Jul 8, 2014 at 1:59 PM, Aleksandar Ivanisevic aleksan...@ivanisevic.de wrote: Hi, is anyone using flashcache vith openvz? If so, which version and with which kernel? Versions lower than 3 do not compile against the latest el6 kernel and version 3.11 and the latest git oopses in flashcache_md_write_kickoff with a null pointer. I see provisions to detect ovz kernel source in flashcache makefile, so someone must be compiling and using it. Any other SSD caching software that works with openvz? regards, ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] Manage KVM/Qemu and OpenVZ the same way
Hello, I know about the recent change in UB limits default settings in vzctl. I haven't implemented the same logic into bossonvz yet because I have had some problems with the mentioned change in vzctl on some of my testing containers in the past. I will return to the problem and fix it, it will be very simple. About ploop: we don't use ploop on our clusters because we have a shared storage based on top of drbd. All container data is replicated to all cluster nodes and so during migration, we don't have to wait for the sync (be it ploop copy or scp). How long would the container migrate using the ploop copy if a container partition would be, let's say, 500 GiB? We also try to keep the amount of storage layers as small as possible to gain maximum throughput. OCFS, clustered LVMs and drbd suit us quite well. You can extend or shrink LVMs online and extend fss online with ext4 at least. You can transfer an LVM to a remote node online using pvmove and iscsi. We use it regularly without any trouble. Online snapshot merging is not possible with LVMs, that is true. I don't know if I like the fact that you had to patch ext4 to get the extra features of ploop. I wouldn't say that trading stability for functions is the best idea. We've had problems in the past with bugs in the modified vzkernel ext4 leading to broken production file systems. -- David Fabian Cluster Design, s.r.o. Dne Čt 3. července 2014 11:13:19, Kir Kolyshkin napsal(a): On 07/03/2014 05:19 AM, Bosson VZ wrote: Hi, the driver supports vSwap AFAIK. You can set RAM limits (soft, hard) and SWAP hard limit (soft is always 0). Could you explain to me what you mean by vRaw? I understand that vzctl provides a lot of knobs to play with but since libvirt is supposed to be a common management interface, I had to play by the libvirt rules. I extended the libvirt XML syntax only as much as was needed for supporting the amount of features that we use at the company. I also didn't want break too many things and sticked with the semantics that was already in libvirt for LXC. UBC settings is currently reduces to only manage RAM and SWAP. All other UBC limits are set as unrestricted. You'd better also set some secondary UBCs (if those are not set explicitly), same as vzctl does and as described at http://openvz.org/VSwap#Implicit_UBC_parameters Those are lockedpages, oomguarpages, vmguarpages, and optionally privvmpages. Technically, it is not hard to extend the driver to support all the UBC limits but I don't want to divert from the upstream libvirt domain file syntax too much. Ploop is not supported as we don't use it in the company. Most of the features that ploop provides can be easily achieved with LVM/drbd. I tend to disagree here. First, ploop works on top of ext4 filesystem, so it's way more flexible. You just can't move an LVM partition to a different server (in ploop case it's just scp). There is no online snapshot merging in LVM as far as I know. Finally, I can't see how DRBD can be a replacement for ploop copy. This is just from the top of my head, maybe there's something else as well (say I'm not sure how good is LVM online grow/shrink). However, unlike the UBC limits, there is already a syntax for mounting a file as a file system in libvirt, so implementing ploop might be possible. David Fabian Cluster Design, s.r.o. Dne St 2. c(ervence 2014 17:20:19, Pavel Odintsov napsal(a): Hello! Very nice! But what about vRaw/vSwap/non standard UBC management and ploop support? I'm used libvirt for kvm few years but it's really ugly for OpenVZ in upstream repository from RH. On Wed, Jul 2, 2014 at 4:26 PM, Bosson VZ bosso...@bosson.eu wrote: Helo, for everyone who would like to manage their Qemu/KVM and OpenVZ virtuals in the same fashion, I am presenting a new libvirt driver, bossonvz, which will allow you to manage OpenVZ containers with libvirt. To name a couple of features: - complete control over the container - live migration via libvirtd - remote VNC console - fs mounts management Just check this web page out to find out more. http://bossonvz.bosson.eu/ The driver is provided as a separate patch to libvirt and as RPM packages for CentOS/SL 6.5. -- David Fabian Cluster Design, s.r.o. ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] CentOS 7 OS Template now in contrib
Greetings, - Original Message Benjamin Henrion bhenrion at ffii.org - I think at some point Openvz.org should provide trusted builds like docker is doing. Ok, I'll bite. What is a Docker Trusted Build? Whatever those are, I'm sure the OpenVZ official OS Templates are the equivalent. In several of OS Templates I contribute (Fedora 20, CentOS 6 and 7, SL 6 [7 ASAP], Oracle EL 6 [7 ASAP]), the build scripts are included within the OS Template (/root/create-*.sh) so the user can build their own from scratch if desired. At least we could get good docs on how those images are built. There are fairly good docs sprinkled throughout the wiki but it varies from distro to distro. I'd guess that the vast majority of OS Templates come from various chroot build environment programs that many distros have now. Provide those programs with a list of packages and they download them from the distro's official repositories, extract them into a install root directory, and then when done, makes some minor changes for containerization (fix up /etc/fstab, eliminate unneeded gettys, etc). It probably works best when you are building distro X from within distro X. For the contributed OS Templates, there is supposed to be a corresponding forum post with build details but very few people seem to follow that including myself. I need to get better at that. TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work] ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
I knew about few incidents with ___FULL___ data loss from customers of flashcache. Beware of it in production. If you want speed you can try ZFS with l2arc/zvol cache because it's native solution. On Tue, Jul 8, 2014 at 8:05 PM, Nick Knutov m...@knutov.com wrote: We are using latest flashcache 2.* with 2.6.32-042stab083.2 in production for a long time. Planning to migrate 3.0 with latest 090.5 but did not tried yet. 08.07.2014 15:59, Aleksandar Ivanisevic пишет: Hi, is anyone using flashcache vith openvz? If so, which version and with which kernel? Versions lower than 3 do not compile against the latest el6 kernel and version 3.11 and the latest git oopses in flashcache_md_write_kickoff with a null pointer. I see provisions to detect ovz kernel source in flashcache makefile, so someone must be compiling and using it. Any other SSD caching software that works with openvz? -- Best Regards, Nick Knutov http://knutov.com ICQ: 272873706 Voice: +7-904-84-23-130 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users -- Sincerely yours, Pavel Odintsov ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
We are using this for only cashing reads (mode thru), not writes. (offtopic) We can not use ZFS. Unfortunately, NAS with something like Nexenta is to expensive for us. Anyway, we are doing completely migrate to SSD. It's just cheaper. 08.07.2014 22:23, Pavel Odintsov пишет: I knew about few incidents with ___FULL___ data loss from customers of flashcache. Beware of it in production. If you want speed you can try ZFS with l2arc/zvol cache because it's native solution. -- Best Regards, Nick Knutov http://knutov.com ICQ: 272873706 Voice: +7-904-84-23-130 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
Greetings, - Original Message - (offtopic) We can not use ZFS. Unfortunately, NAS with something like Nexenta is to expensive for us. From what I've gathered from a few presentations, ZFS on Linux (http://zfsonlinux.org/) is as stable but more performant than it is on the OpenSolaris forks... so you can build your own if you can spare the people to learn the best practices. I don't have a use for ZFS myself so I'm not really advocating it. TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work] ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
I know about this project, but what about stability/compatibility ZFS on Linux with OpenVZ kernel? Has anyone ever tested it? Also, with ext4 I can always at any [our] datacenter boot to rescue mode and, for example, move data to another/new server. I have no idea how to get ZFS data if something happen wrong with hardware or recently installed kernel with usual From the other side, we are using flashcache in production for about two years. With zero problems during all this time. It is not as fast as Bcache (which is not compatible with OpenVZ I think), but it solves problem well. 08.07.2014 23:52, Scott Dowdle пишет: Greetings, - Original Message - (offtopic) We can not use ZFS. Unfortunately, NAS with something like Nexenta is to expensive for us. From what I've gathered from a few presentations, ZFS on Linux (http://zfsonlinux.org/) is as stable but more performant than it is on the OpenSolaris forks... so you can build your own if you can spare the people to learn the best practices. I don't have a use for ZFS myself so I'm not really advocating it. TYL, -- Best Regards, Nick Knutov http://knutov.com ICQ: 272873706 Voice: +7-904-84-23-130 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
[Users] RHEL5 kernel end of life
This is to announce that RHEL5 based OpenVZ kernel branch will reach End Of Life in October, 2014, and will no longer be supported thereafter. There is no guarantee for any RHEL5 kernel updates after the given date, so we urge everyone to migrate their systems to RHEL6-based kernels. If you experience difficulties and need help migrating your systems, see http://openvz.org/Support for available support options. The best one is official support from Parallels: http://www.parallels.com/support/virtualization-suite/openvz/ Regards, OpenVZ team. ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] flashcache
Hello! Yep, Read cache is nice and safe solution but not write cache :) No, we do not use ZFS in production yet. We done only very specific tests like this: https://github.com/zfsonlinux/zfs/issues/2458 But you can do some performance tests and share :) On Wed, Jul 9, 2014 at 12:55 AM, Nick Knutov m...@knutov.com wrote: I read http://www.stableit.ru/2014/07/using-zfs-with-openvz-openvzfs.html . Do you use it in production? Can you share speed tests or some other experience with zfs and openvz? 08.07.2014 22:23, Pavel Odintsov пишет: I knew about few incidents with ___FULL___ data loss from customers of flashcache. Beware of it in production. If you want speed you can try ZFS with l2arc/zvol cache because it's native solution. -- Best Regards, Nick Knutov http://knutov.com ICQ: 272873706 Voice: +7-904-84-23-130 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users -- Sincerely yours, Pavel Odintsov ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
