From 82b4917a668835cc02f4572933384d57b15ae52f Mon Sep 17 00:00:00 2001 From: Dietmar Maurer Date: Tue, 5 Jan 2016 10:21:13 +0100 Subject: [PATCH] import vzdump docs --- vzdump.adoc | 178 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 vzdump.adoc diff --git a/vzdump.adoc b/vzdump.adoc new file mode 100644 index 0000000..31f83d8 --- /dev/null +++ b/vzdump.adoc @@ -0,0 +1,178 @@ +include::attributes.txt[] +ifdef::manvolnum[] +PVE({manvolnum}) +================ + +NAME +---- + +vzdump - Backup Utility for VMs and Containers + + +SYNOPSYS +-------- + +include::vzdump.1-synopsis.adoc[] + + +DESCRIPTION +----------- +endif::manvolnum[] + +ifndef::manvolnum[] +Backup and Restore +================== +endif::manvolnum[] + +'vzdump' is an utility to make consistent snapshots of running virtual +machines (VMs). It basically creates an archive of the VM private +area, which also includes the VM configuration files. 'vzdump' +currently supports LXC containers and QemuServer VMs. + +There are several ways to provide consistency (option `mode`): + +`stop` mode:: + +Stop the VM during backup. This results in a very long downtime. + +`suspend` mode:: + +For containers, this mode uses rsync to copy the VM to a temporary +location (see option `--tmpdir`). Then the VM is suspended and a second +rsync copies changed files. After that, the VM is started (resume) +again. This results in a minimal downtime, but needs additional space +to hold the VM copy. + +For QemuServer, this mode will suspend the VM, start +a live backup, and resume the VM. + +`snapshot` mode:: + +For containers, this mode uses the snapshotting facilities of the +underlying storage. A snapshot will be made of the container volume, +and the snapshot content will be archived in a tar file. + +For QemuServer, this mode will do a live backup similar to the +`snaphost` mode, but without suspending/resuming the VM. + +A technical overview of the Proxmox VE live backup for QemuServer can +be found online +https://git.proxmox.com/?p=pve-qemu-kvm.git;a=blob;f=backup.txt[here], + +Backup File Names +----------------- + +Newer version of vzdump encodes the virtual machine type and the +backup time into the filename, for example + + vzdump-lxc-105-2009_10_09-11_04_43.tar + +That way it is possible to store several backup into the same +directory. The parameter `maxfiles` can be used to specify the +maximal number of backups to keep. + +Restore +------- + +The resulting archive files can be restored with the following programs. + + +`pct restore`:: Containers restore utility + +`qmrestore`:: QemuServer restore utility + +For details see the corresponding manual pages. + +Configuration +------------- + +Global configuration is stored in '/etc/vzdump.conf'. + + tmpdir: DIR + dumpdir: DIR + storage: STORAGE_ID + mode: snapshot|suspend|stop + bwlimit: KBPS + ionize: PRI + lockwait: MINUTES + stopwait: MINUTES + size: MB + maxfiles: N + script: FILENAME + exclude-path: PATHLIST + +Hook Scripts +------------ + +You can specify a hook script with option `--script`. This script is +called at various phases of the backup process, with parameters +accordingly set. You can find an example in the documentation +directory ('vzdump-hook-script.pl'). + +File Exclusions +--------------- + +First, this option is only available for container backups. 'vzdump' +skips the following files with option `--stdexcludes` + + /var/log/.+ + /tmp/.+ + /var/tmp/.+ + /var/run/.+pid + +Or you can manually specify exclude paths, for example: + + # vzdump 777 --exclude-path '/tmp/.+' --exclude-path '/var/tmp/.+' + +(only excludes tmp directories) + +Configuration files are also stored inside the backup archive +(`/etc/vzdump/`), and will be correctly restored. + +Examples +-------- + +Simply dump VM 777 - no snapshot, just archive the VM private area and +configuration files to the default dump directory (usually +'/var/liv//vz/dump/'). + + # vzdump 777 + +Use rsync and suspend/resume to create an snapshot (minimal downtime). + + # vzdump 777 --mode suspend + +Backup all VMs and send notification mails to root and admin. + + # vzdump --all --mode suspend --mailto root --mailto admin + +Use snapshot mode (no downtime). + + # vzdump 777 --dumpdir /mnt/backup --mode snapshot + +Backup more than one VM (selectively) + + # vzdump 101 102 103 --mailto root + +Backup all VMs excluding VM 101 and 102 + + # vzdump --mode suspend --exclude 101,102 + +Restore a container to a new VM 600 + + # pct restore 600 /mnt/backup/vzdump-lxc-777.tar + +Restore a Qemu/KVM machine to VM 601 + + # qmrestore /mnt/backup/vzdump-qemu-888.vma 601 + +Clone an existing container 101 to a new container 300 with a 4GB root +file system, using pipes + + # vzdump 101 --stdout | pct restore --rootfs 4 300 - + + +ifdef::manvolnum[] +include::pve-copyright.adoc[] +endif::manvolnum[] + -- 2.39.2