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{{Warning| Running DISPLAYTITLE: vzctl on for upstream kernels is considered an experimental feature.kernel}}
== Limitations ==
{{Note|We recommend using [[Download/kernel/rhel6|OpenVZ kernel]] for features, stability and security}} The following vzctl commands are not working at allwith the non-OpenVZ kernel:
* <code>quotaon</code>/<code>quotaoff</code>/<code>quotainit</code> (vzquota-specific)
* <code>convert</code>, <code>compact</code>, <code>snapshot*</code> (ploop-specific)
* <code>console</code> (need needs a virtual /dev/console, /dev/ttyN device)* <code>enter</code>, <code>exec</code> and <code>runscript</code> (need pidns entering support)* <code>chkpnt</code>, <code>restore</code> (currently need OpenVZ-kernel-specific checkpointing, [http://cruicriu.org/ CRIU] will be supported later)
The following commands have severe limitationsbinaries are not ported to work on top of upstream kernel:* <code>stop</code>. A container can be stopped from inside (say if one is connected to CT over ssh) in case the underlying kernel supports rebooting a PID namespace (> 3.4). Using vzctl, the "stop" command is not supported, unless accompanied by the --fast switch, which will simply forceably kill all processes in the container.vzlist* vzcalc* vzcfgvalidate* vzcpucheck* vzmemcheck* vzmigrate* vzeventd* vzpid* vzsplit* vzubc
=== /proc and /sys ===
=== Resource management ===
* cpu.cfs_quota_us
* cpu.shares
* memory.kmem.tcp.limit_in_bytes
=== Other binaries =Building ==
=== Dependencies ===
* iproute2 >= 3.0.0 (runtime only)
* libcg libcgroup >= 0.38 === Download === You can get the latest released version from [[Download/vzctl/{{Latest vzctl}}#sources]] or directly from [[download:utils/vzctl/current/src/]]. If you are living on the bleeding edge, get vzctl sources from git. Then run autogen.sh to recreate auto* files: git clone <nowiki>https://src.openvz.org/scm/ovzl/vzctl.git</nowiki> cd vzctl ./autogen.sh
=== Compile ===
* vzctl in [https://launchpad.net/ubuntu/+source/vzctl Ubuntu Linux] [https://help.ubuntu.com/community/OpenVZ Description]* vzctl-core in [https://apps.fedoraproject.org/packages/vzctl-core Fedora Linux] [https://fedoraproject.org/wiki/QA:Testcase_vzctl_base Description]* sys-cluster/vzctl in [http://packages.gentoo.org/package/sys-cluster/vzctl Gentoo Linux]* vzctl in [https://packages.debian.org/search?keywords=vzctl Debian Linux]* vzctl in [http://packages.altlinux.org/vzctl ALT Linux] ([http://altlinux.org/OpenVZ description]) == Networking Known issues and workarounds == === A container doesn't boot and udevd is in a process list ===Networking udev doesn't work, because <code>uevent</code>s are not virtualized yet. If you don't know how to disable it, you can remove the udev package. === <code>vzctl enter</code> doesn't work === You see this when trying to use <code>vzctl enter</code>: Unable to open pty: No such file or directory If a CT is available through executed in a user namespace, devpts must be mounted with the switches --netdev_add, --netif_add, and their respective deletion counterpartsnewinstance option. You can add this option in container's <code>/etc/fstab</code> file. == See also ==