man/vzmigrate.8.in

.TH vzmigrate 8 "5 Mar 2013" "OpenVZ" "Containers"

.SH NAME
vzmigrate \- migrate a container between two OpenVZ servers

.SH SYNOPSIS
.SY vzmigrate
.OP -r\fR|\fB--remove-area\ \fByes\fR|\fBno
.OP --ssh=\fIssh_options
.OP --ssh-mux
.OP --rsync=\fIrsync_options
.OP --keep-dst
.OP --live
.OP -c\fR|\fB--compact
.OP -s\fR|\fB--snapshot
.OP --check-only\fR|\fB--dry-run
.OP -f\fR|\fB--nodeps\fR[\fB=\fIcheck\fR[\fB,\fIcheck\fR\ ...]]
.OP -t\fR|\fB--times
.OP -v
.I destination_address CTID
.SY vzmigrate
.BR -h | --help | --usage
.YS
.SH DESCRIPTION
This utility is used to migrate a container from one (source) Hardware Node (HN)
to another (destination) HN. The utility can migrate either stopped or running
container. For a stopped container, simple CT private area transfer is performed
(\fBrsync\fR(1) is used for file transfer). For running containers,
either traditional (with CT stop and start) or live migration is possible.

This program uses \fBssh\fR as a transport layer. You will need to put ssh
public key to destination node and be able to connect to node without
entering password.

.SH OPTIONS
.TP
\fB-r\fR, \fB--remove-area\fR \fByes\fR | \fBno\fR
Whether to remove a container area on source HN for the successfully
migrated container. Default is \fByes\fR.

.TP
\fB--ssh=\fIoptions\fR
Additional \fIoptions\fR that will be passed to ssh while establishing
connection to destination HN.

.TP
.B --ssh-mux
Enable ssh channel multiplexing, establishing and reusing a single
ssh connection to remote server. This speeds up live migration.

.TP
\fB--rsync=\fIoptions\fR
Additional \fIoptions\fR that will be passed to \fBrsync\fR(8).
You may add options like \fB-z\fR to enable data compression
if you are migrating over a slow link.

.TP
.B --keep-dst
Do not clean synced destination container private area in case of some
error. It makes sense to use this option on big container migration to avoid
syncing container private area again in case some error (on container stop for
example) occurs during first migration attempt.

.TP
.B --live
Perform live migration: instead of restarting a container, checkpoint
and restore are used, so there is no container downtime or service
interruption. Additional steps are performed to minimize the time
when a container is in suspended state.
Option \fB--online\fR can be used as a backward-compatible alias.

.TP
\fB-c\fR, \fB--compact\fR
Compact a container image (i.e. run \fBvzctl compact\fR)
before migration. Works for ploop only, ignored otherwise.

.TP
\fB-s\fR, \fB--snapshot\fR
Create a container snapshot (i.e. run \fBvzctl snapshot\fR)
before migration. Works for ploop only, ignored otherwise.

.TP
\fB--check-only\fR, \fB--dry-run\fR
Do not perform actual migration, stop after preliminary checks.
This is used to check if a CT can possibly be migrated. Combine
with \fB--live\fR to enable more checks for live migration case.

.TP
\fB-f\fR|\fB--nodeps\fR[\fB=\fIcheck\fR[\fB,\fIcheck\fR\ ...\]\]
Continue migration, ignoring some or all preliminary check failures.
Particular checks can be ignored by providing an argument to
\fB--nodeps\fR option. The following options can be used
(comma-separated):
.br
\(bu \fBcpu\fR	\- ignore cpu capabilities check;
.br
\(bu \fBipv6\fR	\- ignore ipv6 module check.

.TP
\fB-t\fR, \fB--times\fR
At the end of live migration, output various timings for migration stages
that affect total suspended CT time. Note that it only makes sense
with \fB--live\fR.

.TP
.B -v
Verbose mode. Causes \fBvzmigrate\fP to print debugging messages about
its progress. Note that \fB-v\fR automatically implies \fB-t\fR.
Multiple \fB-v\fR options increase the verbosity.

.TP
.BR -h | --help | --usage
Print usage info and exit.

.SH EXAMPLES
Migration of CT 101 to \fB192.168.1.130\fR with downtime:
.PP
.EX
   vzmigrate 192.168.1.130 101
.EE

Online migration of CT 102 to \fB192.168.1.130\fR:
.PP
.EX
   vzmigrate --live 192.168.1.130 102
.EE
.SH EXIT STATUS
.TP
.B 0 EXIT_OK
Command completed successfully.
.TP
.B 1 EXIT_USAGE
Bad command line options.
.TP
.B 2 EXIT_VE_STOPPED
Container is stopped.
.TP
.B 4 EXIT_CONNECT
Can't connect to destination (source) HN.
.TP
.B 6 EXIT_COPY
Container private area copying/moving failed.
.TP
.B 7 EXIT_VE_START
Can't start or restore destination CT.
.TP
.B 8 EXIT_VE_STOP
Can't stop or checkpoint source CT.
.TP
.B 9 EXIT_EXISTS
Container already exists on destination HN.
.TP
.B 10 EXIT_NOTEXIST
Container does not exists on source HN.
.TP
.B 12 EXIT_IP_INUSE
You attempt to migrate CT which IP address(es) are already in use
on the destination node.
.TP
.B 13 EXIT_QUOTA
Operation with CT quota failed.
.TP
.B 14 EXIT_OVZ_NOT_RUNNING
OpenVZ is not running, or some required kernel modules are not loaded.
.TP
.B 15 EXIT_APPLY_CONFIG
Unable to set CT name on destination node.
.TP
.B 16 EXIT_PLOOP_UNSUP
Ploop is not supported by destination node.
.TP
.B 17 EXIT_UNSUP_CPT_VER
CPT version incompatibility with the destination node.
.TP
.B 18 EXIT_UNSUP_CPU
Destination node CPU incompatibility.
.TP
.B 19 EXIT_CANT_READ_REMOTE_CONFIG
Unable to read remote vz.conf.
.TP
.B 20 EXIT_LOCKED
Can't lock container (already locked).

.SH SEE ALSO
.BR rsync (1),
.BR vzcptcheck (8).

.SH COPYRIGHT
Copyright (C) 2001-2013, Parallels, Inc. Licensed under GNU GPL.