Q: I'm using a virtual machine based on LXD (Linux Containers). How can I automatically start the LXD container when the system boots up?
When LXD starts at boot, you can configure containers to launch automatically. To do this, set the `boot.autostart` option to `true`. Additionally, you can use `boot.autostart.priority` (default is 0) to define the order in which containers are started — starting with the highest priority first. You can also use `boot.autostart.delay` (default is 0) to specify a delay in seconds before starting another container after one has been launched.
The options mentioned above can be configured using the `lxc` command-line tool with the following syntax:
```
$ lxc config set
```
For example:
```
$ lxc config set boot.autostart true
$ lxc config set boot.autostart.priority
$ lxc config set boot.autostart.delay
```
To make an LXD container start automatically on Ubuntu 16.10, run the following command:
```
$ lxc config set nginx-vm boot.autostart true
```
This will ensure that the container named `nginx-vm` starts automatically when the system boots.
You can verify the configuration using:
```
$ lxc config get nginx-vm boot.autostart
```
Sample output:
```
true
```
If you want to delay the startup of another container by 10 seconds after launching the first one, use:
```
$ lxc config set nginx-vm boot.autostart.delay 10
```
To control the startup order, assign higher priority values to containers that should start first. For instance, if you want `db_vm` to start before `nginx_vm`, set their priorities as follows:
```
$ lxc config set db_vm boot.autostart.priority 100
$ lxc config set nginx_vm boot.autostart.priority 99
```
To view all the current boot-related settings for multiple containers, you can use a simple bash script like this:
```bash
#!/bin/bash
echo "The current values of each VM boot parameters:"
for c in db_vm nginx_vm memcache_vm
do
echo "*** VM: $c ***"
for v in boot.autostart boot.autostart.priority boot.autostart.delay
do
echo "Key: $v => $(lxc config get $c $v)"
done
echo ""
done
```
This script will display the boot configuration for each container, including autostart status, priority, and delay.
Sample output might look like:
```
*** VM: db_vm ***
Key: boot.autostart => true
Key: boot.autostart.priority => 100
Key: boot.autostart.delay => 0
*** VM: nginx_vm ***
Key: boot.autostart => true
Key: boot.autostart.priority => 99
Key: boot.autostart.delay => 10
```
This helps you manage and monitor how your LXD containers behave during system boot.Cable Entry Frame
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