- Plesk for Linux
- Docker is installed on the Plesk server with `firewalld` enabled;
The following Docker-related messages are found in
CONFIG_TEXT: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -C OUTPUT -m addrtype --dst-type LOCAL -j DOCKER ! --dst 127.0.0.0/8' failed: iptables: No chain/target/match by that name.
WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C FORWARD -o docker0 -j DOCKER' failed: iptables: No chain/target/match by that name.
WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT' failed: iptables: Bad rule (does a matching rule exist in that chain?).
Docker-related warning messages in firewalld log result of internal Docker startup sanity checks. Docker tries to make sure that there are no existing rules in firewalld before setting up a container, so it tells firewalld to remove any rules. But if there are no rules, firewalld is logging that fact.
These warning messages can be safely ignored. No actions are required.