[lxc-users] How to check DNS records of containers

[Adil Baig]

How do i restart dnsmasq without restarting lxd? That would pause all my
containers.

On Wed, Jun 28, 2017 at 3:47 PM, Fajar A. Nugraha <list at fajar.net> wrote:

> On Wed, Jun 28, 2017 at 4:36 PM, Adil Baig <simplyadilb at gmail.com> wrote:
>
>> In the new LXD (2.5+) is there automatic DNS resolution for containers on
>> the host?
>>
>>
> It can. But you need to make it so.
>
>
>> I'd like to configure a virtual host on Apache (on the host mahcine) to
>> proxy requests to a container using its DNS rather than its IP. How can i
>> do this?
>>
>>
> (1) See https://stgraber.org/2016/10/27/network-management-with-lxd-2-3/
> . In particular:
> - creating a new network bridge (or use lxdbr0, if you want)
> - dns.domain and ipv4.address (for the bridge)
> - (optional, if you want "static" ip for the container): "lxc network
> attach" and ipv4.address for the container
>
> (2) configure the container to use DHCP. Dnsmasq will assign the
> appropriate IP based on the ip address you assign to the container in the
> previous step
>
> (3) make sure you have dnsmasq installed on the host. Install it if you
> don't have it.
>
> (4) make sure /etc/dnsmasq.d/lxd on the host exclude the interface created
> on step (1) (e.g. except-interface=lxdbr0)
>
> (5) Create a file (I call mine /etc/dnsmasq.d/lxd-resolve), with this
> line (adjust IP and domain as necessary)
> server=/lxd/10.0.3.1
>
> (6) restart dnsmasq on the host if necessary
>
> You can then refer to container using dns from the host
> # lxc list test
> +------+---------+-------------------+------+------------+-----------+
> | NAME |  STATE  |       IPV4        | IPV6 |    TYPE    | SNAPSHOTS |
> +------+---------+-------------------+------+------------+-----------+
> | test | RUNNING | 10.0.3.117 (eth0) |      | PERSISTENT | 1         |
> +------+---------+-------------------+------+------------+-----------+
>
> # ping -n -c 1 test.lxd
> PING test.lxd (10.0.3.117) 56(84) bytes of data.
> 64 bytes from 10.0.3.117: icmp_seq=1 ttl=64 time=0.082 ms
>
> --- test.lxd ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 0.082/0.082/0.082/0.000 ms
>
>
> --
> Fajar
>
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