MySQL group replication plugin won't recognize host's IP address?

I have pulled the current mysql-server image (mysql-server) on 2 Ubuntu 18.04 machines and I want to set up group replication. This is how I start the mysql container on each machine (--server-id is 2 for the second machine): docker run -d --name=gr-mysql \ -v /var/lib/mysql:/var/lib/mysql \ -e MYSQL_ROOT_PASSWORD=secret -e MYSQL_ROOT_HOST=% \ -p 3306:3306 -p 33061:33061 \ mysql/mysql-server:8.0 \ --port=3306 \ --log-error-verbosity=3 \ --server-id=1 \ --log-bin='mysql-bin-1.log' \ --enforce-gtid-consistency=ON \ --log-slave-updates=ON \ --gtid-mode=ON \ --transaction-write-set-extraction=XXHASH64 \ --binlog-checksum=NONE \ --master-info-repository=TABLE \ --relay-log-info-repository=TABLE \ --plugin-load=group_replication.so \ --relay-log-recovery=ON \ --loose-group_replication_start_on_boot=OFF \ --loose-group_replication_group_name=a_valid_uuid \ --loose-group_replication_local_address=1.2.3.1:33061 \ --loose-group_replication_group_seeds=1.2.3.1:33061,1.2.3.2:33061 \ --loose-group_replication_single_primary_mode=OFF \ --loose-group_replication_enforce_update_everywhere_checks=ON Now I try to configure group replication on the first machine: docker exec -t aerobase-mysql mysql -uroot -psecret \ -e "SET @@GLOBAL.group_replication_bootstrap_group=1;" \ -e "create user 'repl'@'%';" \ -e "GRANT REPLICATION SLAVE ON *.* TO repl@'%';" \ -e "flush privileges;" \ -e "change master to master_user='repl', master_password='secret' for channel 'group_replication_recovery';" \ -e "START GROUP_REPLICATION;" \ -e "SET @@GLOBAL.group_replication_bootstrap_group=0;" And I'm prompted with this error: ERROR 3096 (HY000) at line 1: The START GROUP_REPLICATION command failed as there was an error when initializing the group communication layer. Checking the container log it seems like MySQL can't get the host's IP address: 2020-09-20T22:17:03.060972Z 220 [System] [MY-013587] [Repl] Plugin group_replication reported: 'Plugin 'group_replication' is starting.' 2020-09-20T22:17:03.061056Z 220 [Note] [MY-011716] [Repl] Plugin group_replication reported: 'Current debug options are: 'GCS_DEBUG_NONE'.' 2020-09-20T22:17:03.062114Z 221 [System] [MY-011565] [Repl] Plugin group_replication reported: 'Setting super_read_only=ON.' 2020-09-20T22:17:03.062187Z 220 [Note] [MY-011673] [Repl] Plugin group_replication reported: 'Group communication SSL configuration: group_replication_ssl_mode: "DISABLED"' 2020-09-20T22:17:03.063052Z 220 [Note] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Debug messages will be sent to: asynchronous::/var/lib/mysql/GCS_DEBUG_TRACE' 2020-09-20T22:17:03.063205Z 220 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] There is no local IP address matching the one configured for the local node (1.2.3.1:33061).' 2020-09-20T22:17:03.063415Z 220 [ERROR] [MY-011674] [Repl] Plugin group_replication reported: 'Unable to initialize the group communication engine' 2020-09-20T22:17:03.063434Z 220 [ERROR] [MY-011637] [Repl] Plugin group_replication reported: 'Error on group communication engine initialization' 2020-09-20T22:17:03.063444Z 220 [Note] [MY-011649] [Repl] Plugin group_replication reported: 'Requesting to leave the group despite of not being a member' 2020-09-20T22:17:03.063451Z 220 [ERROR] [MY-011718] [Repl] Plugin group_replication reported: 'Error calling group communication interfaces while trying to leave the group' 2020-09-20T22:17:03.063586Z 221 [System] [MY-011566] [Repl] Plugin group_replication reported: 'Setting super_read_only=OFF.' In the ifconfig output I can see the host's IP address and that it matches what I entered for MySQL: docker0: flags=4163 mtu 1500 inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255 ether 01:23:45:67:89:00 txqueuelen 0 (Ethernet) RX packets 146483 bytes 312211022 (312.2 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 163698 bytes 12222756 (12.2 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ens192: flags=4163 mtu 9000 inet 1.2.3.1 netmask 255.255.255.0 broadcast 1.2.3.255 ether 00:11:22:33:44:55 txqueuelen 13888 (Ethernet) RX packets 23255307 bytes 10382649061 (10.3 GB) RX errors 0 dropped 68 overruns 0 frame 0 TX packets 393777 bytes 34493066 (34.4 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1000 (Local Loopback) RX packets 144 bytes 7948 (7.9 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 144 bytes 7948 (7.9 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth0b41841: flags=4163 mtu 1500 ether 66:55:44:33:22:11 txqueuelen 0 (Ethernet) RX packets 944 bytes 2086507 (2.0 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1058 bytes 81312 (81.3 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Before I can have group replication I need to make MySQL accept the host's IP. I tried adding an IP whitelist and even using host names instead of IP addresses, to no avail. I don't have firewall or SELinux enabled. Thanks! (Question has been moved from SO)