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80c0adcb | 1 | [[chapter_vzdump]] |
82b4917a | 2 | ifdef::manvolnum[] |
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3 | vzdump(1) |
4 | ========= | |
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5 | :pve-toplevel: |
6 | ||
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7 | NAME |
8 | ---- | |
9 | ||
10 | vzdump - Backup Utility for VMs and Containers | |
11 | ||
12 | ||
49a5e11c | 13 | SYNOPSIS |
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14 | -------- |
15 | ||
16 | include::vzdump.1-synopsis.adoc[] | |
17 | ||
18 | ||
19 | DESCRIPTION | |
20 | ----------- | |
21 | endif::manvolnum[] | |
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22 | ifndef::manvolnum[] |
23 | Backup and Restore | |
24 | ================== | |
5f09af76 | 25 | :pve-toplevel: |
194d2f29 | 26 | endif::manvolnum[] |
5f09af76 | 27 | |
12b04941 | 28 | Backups are a requirements for any sensible IT deployment, and {pve} |
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29 | provides a fully integrated solution, using the capabilities of each |
30 | storage and each guest system type. This allows the system | |
31 | administrator to fine tune via the `mode` option between consistency | |
32 | of the backups and downtime of the guest system. | |
33 | ||
34 | {pve} backups are always full backups - containing the VM/CT | |
35 | configuration and all data. Backups can be started via the GUI or via | |
36 | the `vzdump` command line tool. | |
12b04941 | 37 | |
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38 | .Backup Storage |
39 | ||
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40 | Before a backup can run, a backup storage must be defined. Refer to |
41 | the Storage documentation on how to add a storage. A backup storage | |
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42 | must be a file level storage, as backups are stored as regular files. |
43 | In most situations, using a NFS server is a good way to store backups. | |
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44 | You can save those backups later to a tape drive, for off-site |
45 | archiving. | |
12b04941 | 46 | |
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47 | .Scheduled Backup |
48 | ||
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49 | Backup jobs can be scheduled so that they are executed automatically |
50 | on specific days and times, for selectable nodes and guest systems. | |
51 | Configuration of scheduled backups is done at the Datacenter level in | |
52 | the GUI, which will generate a cron entry in /etc/cron.d/vzdump. | |
12b04941 | 53 | |
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54 | Backup modes |
55 | ------------ | |
94e50bf6 | 56 | |
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57 | There are several ways to provide consistency (option `mode`), |
58 | depending on the guest type. | |
82b4917a | 59 | |
c7678c11 | 60 | .Backup modes for VMs: |
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61 | |
62 | `stop` mode:: | |
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63 | |
64 | This mode provides the highest consistency of the backup, at the cost | |
65 | of a downtime in the VM operation. It works by executing an orderly | |
66 | shutdown of the VM, and then runs a background Qemu process to backup | |
67 | the VM data. After the backup is complete, the Qemu process resumes | |
68 | the VM to full operation mode if it was previously running. | |
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69 | |
70 | `suspend` mode:: | |
71 | ||
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72 | This mode is provided for compatibility reason, and suspends the VM |
73 | before calling the `snapshot` mode. Since suspending the VM results in | |
74 | a longer downtime and does not necessarily improve the data | |
75 | consistency, the use of the `snapshot` mode is recommended instead. | |
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76 | |
77 | `snapshot` mode:: | |
78 | ||
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79 | This mode provides the lowest operation downtime, at the cost of a |
80 | small inconstancy risk. It works by performing a Proxmox VE live | |
81 | backup, in which data blocks are copied while the VM is running. If the | |
82 | guest agent is enabled (`agent: 1`) and running, it calls | |
8c1189b6 | 83 | `guest-fsfreeze-freeze` and `guest-fsfreeze-thaw` to improve |
c7678c11 | 84 | consistency. |
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85 | |
86 | A technical overview of the Proxmox VE live backup for QemuServer can | |
87 | be found online | |
fccf8df6 | 88 | https://git.proxmox.com/?p=pve-qemu-kvm.git;a=blob;f=backup.txt[here]. |
01d37422 | 89 | |
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90 | NOTE: Proxmox VE live backup provides snapshot-like semantics on any |
91 | storage type. It does not require that the underlying storage supports | |
92 | snapshots. | |
01d37422 | 93 | |
c7678c11 | 94 | .Backup modes for Containers: |
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95 | |
96 | `stop` mode:: | |
97 | ||
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98 | Stop the container for the duration of the backup. This potentially |
99 | results in a very long downtime. | |
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100 | |
101 | `suspend` mode:: | |
102 | ||
01d37422 | 103 | This mode uses rsync to copy the container data to a temporary |
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104 | location (see option `--tmpdir`). Then the container is suspended and |
105 | a second rsync copies changed files. After that, the container is | |
106 | started (resumed) again. This results in minimal downtime, but needs | |
107 | additional space to hold the container copy. | |
0006064d | 108 | + |
5eba0743 | 109 | When the container is on a local file system and the target storage of |
94e50bf6 | 110 | the backup is an NFS server, you should set `--tmpdir` to reside on a |
5eba0743 | 111 | local file system too, as this will result in a many fold performance |
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112 | improvement. Use of a local `tmpdir` is also required if you want to |
113 | backup a local container using ACLs in suspend mode if the backup | |
114 | storage is an NFS server. | |
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115 | |
116 | `snapshot` mode:: | |
117 | ||
01d37422 | 118 | This mode uses the snapshotting facilities of the underlying |
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119 | storage. First, the container will be suspended to ensure data consistency. |
120 | A temporary snapshot of the container's volumes will be made and the | |
121 | snapshot content will be archived in a tar file. Finally, the temporary | |
122 | snapshot is deleted again. | |
123 | ||
124 | NOTE: `snapshot` mode requires that all backed up volumes are on a storage that | |
8c1189b6 | 125 | supports snapshots. Using the `backup=no` mount point option individual volumes |
b74af7b6 | 126 | can be excluded from the backup (and thus this requirement). |
82b4917a | 127 | |
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128 | NOTE: bind and device mount points are skipped during backup operations, like |
129 | volume mount points with the backup option disabled. | |
21c12755 | 130 | |
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131 | |
132 | Backup File Names | |
133 | ----------------- | |
134 | ||
8e4bb261 | 135 | Newer versions of vzdump encode the guest type and the |
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136 | backup time into the filename, for example |
137 | ||
138 | vzdump-lxc-105-2009_10_09-11_04_43.tar | |
139 | ||
871e1fd6 | 140 | That way it is possible to store several backup in the same |
82b4917a | 141 | directory. The parameter `maxfiles` can be used to specify the |
871e1fd6 | 142 | maximum number of backups to keep. |
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143 | |
144 | Restore | |
145 | ------- | |
146 | ||
147 | The resulting archive files can be restored with the following programs. | |
148 | ||
149 | ||
871e1fd6 | 150 | `pct restore`:: Container restore utility |
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151 | |
152 | `qmrestore`:: QemuServer restore utility | |
153 | ||
154 | For details see the corresponding manual pages. | |
155 | ||
156 | Configuration | |
157 | ------------- | |
158 | ||
8c1189b6 | 159 | Global configuration is stored in `/etc/vzdump.conf`. The file uses a |
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160 | simple colon separated key/value format. Each line has the following |
161 | format: | |
162 | ||
163 | OPTION: value | |
164 | ||
8c1189b6 | 165 | Blank lines in the file are ignored, and lines starting with a `#` |
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166 | character are treated as comments and are also ignored. Values from |
167 | this file are used as default, and can be overwritten on the command | |
168 | line. | |
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169 | |
170 | We currently support the following options: | |
171 | ||
172 | include::vzdump.conf.5-opts.adoc[] | |
173 | ||
174 | ||
8c1189b6 | 175 | .Example `vzdump.conf` Configuration |
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176 | ---- |
177 | tmpdir: /mnt/fast_local_disk | |
178 | storage: my_backup_storage | |
179 | mode: snapshot | |
180 | bwlimit: 10000 | |
181 | ---- | |
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182 | |
183 | Hook Scripts | |
184 | ------------ | |
185 | ||
186 | You can specify a hook script with option `--script`. This script is | |
187 | called at various phases of the backup process, with parameters | |
188 | accordingly set. You can find an example in the documentation | |
8c1189b6 | 189 | directory (`vzdump-hook-script.pl`). |
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190 | |
191 | File Exclusions | |
192 | --------------- | |
193 | ||
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194 | NOTE: this option is only available for container backups. |
195 | ||
8c1189b6 | 196 | `vzdump` skips the following files by default (disable with the option |
8e4bb261 | 197 | `--stdexcludes 0`) |
82b4917a | 198 | |
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199 | /tmp/?* |
200 | /var/tmp/?* | |
201 | /var/run/?*pid | |
82b4917a | 202 | |
8e4bb261 | 203 | You can also manually specify (additional) exclude paths, for example: |
82b4917a | 204 | |
bf01f882 | 205 | # vzdump 777 --exclude-path /tmp/ --exclude-path '/var/foo*' |
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206 | |
207 | (only excludes tmp directories) | |
208 | ||
209 | Configuration files are also stored inside the backup archive | |
65647b07 | 210 | (in `./etc/vzdump/`) and will be correctly restored. |
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211 | |
212 | Examples | |
213 | -------- | |
214 | ||
c31f32a9 | 215 | Simply dump guest 777 - no snapshot, just archive the guest private area and |
82b4917a | 216 | configuration files to the default dump directory (usually |
8c1189b6 | 217 | `/var/lib/vz/dump/`). |
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218 | |
219 | # vzdump 777 | |
220 | ||
871e1fd6 | 221 | Use rsync and suspend/resume to create a snapshot (minimal downtime). |
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222 | |
223 | # vzdump 777 --mode suspend | |
224 | ||
c31f32a9 | 225 | Backup all guest systems and send notification mails to root and admin. |
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226 | |
227 | # vzdump --all --mode suspend --mailto root --mailto admin | |
228 | ||
b74af7b6 | 229 | Use snapshot mode (no downtime) and non-default dump directory. |
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230 | |
231 | # vzdump 777 --dumpdir /mnt/backup --mode snapshot | |
232 | ||
c31f32a9 | 233 | Backup more than one guest (selectively) |
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234 | |
235 | # vzdump 101 102 103 --mailto root | |
236 | ||
c31f32a9 | 237 | Backup all guests excluding 101 and 102 |
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238 | |
239 | # vzdump --mode suspend --exclude 101,102 | |
240 | ||
c31f32a9 | 241 | Restore a container to a new CT 600 |
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242 | |
243 | # pct restore 600 /mnt/backup/vzdump-lxc-777.tar | |
244 | ||
c31f32a9 | 245 | Restore a QemuServer VM to VM 601 |
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246 | |
247 | # qmrestore /mnt/backup/vzdump-qemu-888.vma 601 | |
248 | ||
249 | Clone an existing container 101 to a new container 300 with a 4GB root | |
250 | file system, using pipes | |
251 | ||
252 | # vzdump 101 --stdout | pct restore --rootfs 4 300 - | |
253 | ||
254 | ||
255 | ifdef::manvolnum[] | |
256 | include::pve-copyright.adoc[] | |
257 | endif::manvolnum[] | |
258 |