如何在 Mysql docker 容器中设置 MYSQL_PS1

Question

I have three replicated mysql nodes with group replication.

When I started them, they have the same prompt ( mysql> ). I want to different prompts for all of them

Answer 1

docker exec has a -e option that can specify environment variable.

$ docker exec -e ROOT='r $ ' -it amazing_diffie bash
root@b4bedf563797:/# echo $ROOT
r $

You can also specify the environment variable when the container is created

$ docker run -e MYSQL_ROOT_PASSWORD=bob \
             -e MYSQL_PS1='r $' \
             --name node1  mysql:8.0

Then is already in the container:

$ docker exec  -it node1 bash
root@a3e6e65f2b89:/# env
MYSQL_MAJOR=8.0
HOSTNAME=a3e6e65f2b89
PWD=/
MYSQL_ROOT_PASSWORD=bob
HOME=/root
MYSQL_VERSION=8.0.19-1debian10
GOSU_VERSION=1.12
TERM=xterm
MYSQL_PS1=r $
SHLVL=1
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin