Docker utilizes its own way to provide DNS (hostname, hosts, NS).
By default, they are almost the same as the host's ones.
For instance, below is from AP container:
```
cat /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.2 ipa.example.test ipa
cat /etc/resolv.conf
nameserver 168.63.129.16
search hqdv2iuiph0ufpcrhp4amkgzwf.fx.internal.cloudapp.net
```
As a result FreeIPA uses 168.63.129.16 (AP DNS NS [1]) as a DNS forwarder.
It's not desirable to rely on this.
Let's clear test environment.
[1] https://docs.microsoft.com/en-us/azure/virtual-network/what-is-ip-address-168-63-129-16
Related: https://pagure.io/freeipa/issue/8077
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Stanislav Levin
feae9de73e