docker容器做端口映射报错
docker: Error response from daemon: driver failed programming external connectivity on endpoint nginx01 (7c843d5ed27818f58179a567ebab734b978f027227583d6b4d253e3049fdbe4e): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 3344 -j DNAT --to-destination 172.17.0.2:80 ! -i docker0: iptables: No chain/target/match by that name.
原因：
docker服务启动时定义的自定义链DOCKER被清除
解决方法：
重启即可
systemctl restart docker