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Théo Marchal 2021-09-17 02:18:21 +02:00
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# LXC tips
## Create a container
* `$ lxc launch [distribution] [name]`
* **example:** `$ lxc launch images:debian/10 test-container`
## List available distribution images
* `$ lxc image list images:`
## List existing containers
* `$ lxc list`
```
+----------------+---------+----------------------+---------------------------+------------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+----------------+---------+----------------------+---------------------------+------------+-----------+
| alpine | STOPPED | | | PERSISTENT | 1 |
+----------------+---------+----------------------+---------------------------+------------+-----------+
| debian | STOPPED | | | PERSISTENT | 0 |
+----------------+---------+----------------------+---------------------------+------------+-----------+
| ubuntu | STOPPED | | | PERSISTENT | 3 |
+----------------+---------+----------------------+---------------------------+------------+-----------+
| minimal | RUNNING | 10.10.10.10 (eth0) | fd80::0000 (eth0) | PERSISTENT | 0 |
+----------------+---------+----------------------+---------------------------+------------+-----------+
| test-container | STOPPED | | | PERSISTENT | 0 |
+----------------+---------+----------------------+---------------------------+------------+-----------+
```
## Change state
* Start a container: `$ lxc start [container]`
* Stop a container: `$ lxc stop [container]`
## Access a container
* `$ lxc exec [repository] [command]`
* **example:** `$ lxc exec test-container bash`
## Snapshots
* Create a snapshot: `$ lxc snapshot [container] [snapshot_name]`
* **example:** `$ lxc snapshot test-container base_state`
* Restore a snapshot: `$ lxc restore [container] [snapshot_name]`
* **example:** `$ lxc restore test-container base_state`
## Copy files
* To a container: `$ lxc file push [/local/files/to/copy] [container]/[destination/path]`
* **example:** `$ lxc file push -r /home/user/files test-container/root` (add `-r` to copy a folder)
* From a container: `$ lxc file pull [container][/files/to/copy] [destination/path]`
* **example:** `$ lxc file pull test-container/root/files .`
## Privileged containers
This feature is only available when LXD is installed.
* When creating a container: `$ lxc launch [distribution] [name] -c security.privileged=true`
* Please note that this parameter apparently cannot be changed later.
When a container is privileged, we can share folders from the host to the container, in a **read-write** manner. We can still add a shared folder with unprivileged containers, but they will be **read-only** (chowned at nobody:nobody).
Note that you will need to change the group and user of the folder to the corresponding one of lxd (use `id lxd` to know it) before adding it.
* Adding a shared folder: `$ lxc config device add [container] [share_name] disk source=[/host/path/] path=[/container/path]`
* **example:** `$ lxc config device add test-container home_dir disk source=/home/$USER path=/home/ubuntu`