How to enable DNS for your LXD containers. If your system use systemd and NetworkManager you can follow this example:
Assuming you have a network called lxdbr0 with the following configuration:
$ lxc network show lxdbr0
config:
dns.domain: local.dev
ipv4.address: 10.0.0.1/24
ipv4.nat: "true"
ipv6.address: fd42:c743:9b8:4f8e::1/64
ipv6.nat: "true"
description: ""
name: lxdbr0
type: bridge
used_by:
- /1.0/instances/postgres-01
- /1.0/profiles/default
- /1.0/profiles/dev
managed: true
status: Created
locations:
- none
LXD will start a dnsmasq process listening on 10.0.0.1.
If systemd-resolved is not already enabled then run the following command:
$ sudo systemctl enable systemd-resolved.service
Now let’s configure NetworkManager to delegate DNS to systemd-resolved:
- Create the file /etc/NetworkManager/conf.d/00-use-systemd-resolved.conf
- Edit that file and paste the following content:
[plugins] dns=systemd-resolvedYou can get more information by running man(5) NetworkManager.
Then we add the DNS server for our domain local.dev on the network interface lxdbr0:
$ sudo resolvectl dns lxdbr0 10.0.0.1
$ sudo resolvectl domain lxdbr0 '~local.dev'
.. Restart NetworkManager
$ sudo systemctl restart NetworkManager
.. And try to ping one of your container :
$ ping postgres-01.local.dev
PING postgres-01.local.dev(fd42:c743:9b8:4f8e:216:3eff:fe0c:4d51 (fd42:c743:9b8:4f8e:216:3eff:fe0c:4d51)) 56 octets de données
64 octets de fd42:c743:9b8:4f8e:216:3eff:fe0c:4d51 (fd42:c743:9b8:4f8e:216:3eff:fe0c:4d51) : icmp_seq=1 ttl=64 temps=0.079 ms
64 octets de fd42:c743:9b8:4f8e:216:3eff:fe0c:4d51 (fd42:c743:9b8:4f8e:216:3eff:fe0c:4d51) : icmp_seq=2 ttl=64 temps=0.112 ms
$ ping -4 postgres-01.local.dev
PING (10.0.0.86) 56(84) octets de données.
64 octets de 10.0.0.86 (10.0.0.86) : icmp_seq=1 ttl=64 temps=0.031 ms
64 octets de 10.0.0.86 (10.0.0.86) : icmp_seq=2 ttl=64 temps=0.101 ms
64 octets de 10.0.0.86 (10.0.0.86) : icmp_seq=3 ttl=64 temps=0.090 ms
It works for IPv6 and IPv4 :)