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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>