docker change hostname

When docker is running, it is the same as the container id, and the host name is randomly generated. If you want to fix the host name, I will summarize several common methods.

specify hostname

When docker run, specify the hostname parameter, this parameter will directly write the corresponding hostname to the /etc/hostname file of the machine

docker run -itd --network $netname --hostname $host --name $name yourimage

Specify other machine information

You can also add hostname: use the add-host=$hostname:$ip parameter, which will add a line of mapping to the /etc/hostname file in the container

docker run -itd --network $netname --add-host=$host:$ip --name $name yourimage

If it is through docker-compose, you need to pass the extra_hosts parameter

# docker-compose.yml
extra_hosts:
 - "host1:172.18.0.3"
 - "host2:172.18.0.4"

If deployed through k8s

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