How to solve the problem that docker cannot perform port mapping

How to solve the problem that docker cannot perform port mapping?

Fault background:

When I started the docker container and performed port mapping today, I found an error. The port mapping could not be performed. The error was reported as follows:

[root @kvm66 ~]# docker run -d -p 20024:22 centos-ssh /usr/sbin/sshd -D

##63f7d417b2dbf0026e0bb6da631ad64bf6ece14a8fd05f519d54892fe5bd5447

Error response from daemon: Cannot start container 63f7d417b2dbf0026e0bb6da631ad64bf6ece14a8fd05f519d54892fe5bd5447: iptables failed: iptables -t nat -A DOCKER -p tcp -d 0/0 --dport 20024 -j DNAT --to-destination 172.17.0.24:22 ! -i docker0: iptables: No chain/target/match by that name.

Then I remembered that there was a problem with the remote connection of the server a few days ago, and I turned off the firewall myself

Solution:

Submit the image of the container that needs to be saved

[

root@kvm66 ~]# docker commit 688a2b65fe6e blue-zk
1e44a667d2fc0523718019f57ee9a1563d3ba9ab49a6fb840a43e9e664b37ca2
[root@kvm66 ~]# docker images
REPOSITORY                 TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
blue-zk                    latest              1e44a667d2fc        25 seconds ago      945.3 MB
[root@kvm66 ~]# /etc/init.d/docker stop
停止docker：                                             [确定]
[root@kvm66 ~]# iptables -t nat -F
[root@kvm66 ~]# ifconfig docker0 down
[root@kvm66 ~]# brctl delbr docker0

Restart docker after that

[root@kvm66 ~]# /etc/init.d/docker status

Start the container for port mapping

Related references:

docker tutorial

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