《Docker系列》Docker容器修改配置文件后，重启失败，如何修改配置并启动容器？

Docker容器修改配置文件后，重启失败，如何修改配置并启动容器？

docker部署的MySQL容器，修改了my.cnf配置文件，重启的时候导致无法启动

通过查日志发现，配置文件中的binlog-db-db=hw写错了，应该是binlog-do-db=hw。

这时候需要修改配置文件，才能启动，但是呢？容器又启动不了

这种情况可以通过两种方式处理

[root@zxy_master mysql03]# docker logs e1aa5d676710
2023-03-03 08:27:23+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 5.7.40-1.el7 started.
2023-03-03 08:27:23+00:00 [ERROR] [Entrypoint]: mysqld failed while attempting to check configcommand was: mysqld --verbose --help --log-bin-index=/tmp/tmp.uebX7jnPYr2023-03-03T08:27:23.657000Z 0 [ERROR] unknown variable 'binlog-db-db=hw'
2023-03-03T08:27:23.660333Z 0 [ERROR] Aborting
2023-03-03 08:27:52+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 5.7.40-1.el7 started.
2023-03-03 08:27:52+00:00 [ERROR] [Entrypoint]: mysqld failed while attempting to check configcommand was: mysqld --verbose --help --log-bin-index=/tmp/tmp.HmpBPq7emF2023-03-03T08:27:52.311118Z 0 [ERROR] unknown variable 'binlog-db-db=hw'
2023-03-03T08:27:52.314845Z 0 [ERROR] Aborting

方式一：查找跟docker容器映射的本地文件

docker inspect [容器ID]

查看容器详情时，主要关注Mounts处，可以查看到跟容器映射的本地文件，修改后即可成功启动。

我采用的是第二种方法，所以对方式一不做太多说明，可以自行尝试。

"Mounts": [{"Type": "bind","Source": "/zxy/apps/docker_mysql/mysql03/log","Destination": "/var/log/mysql","Mode": "","RW": true,"Propagation": "rprivate"},{"Type": "bind","Source": "/zxy/apps/docker_mysql/mysql03/data","Destination": "/var/lib/mysql","Mode": "","RW": true,"Propagation": "rprivate"},{"Type": "bind","Source": "/zxy/apps/docker_mysql/mysql03/conf","Destination": "/etc/mysql/conf.d","Mode": "","RW": true,"Propagation": "rprivate"}],

方式二：拷贝容器文件到本地，修改后再上传

# 1.复制容器文件到本地
[root@zxy_master data]# docker cp e1aa5d676710:/etc/my.cnf ./
# 2.修改错误项
[root@zxy_master data]# vim my.cnf
# 3.复制修改后文件到容器
[root@zxy_master data]# docker cp ./my.cnf e1aa5d676710:/etc/my.cnf
# 4.重启成功
[root@zxy_master data]# docker start e1aa5d676710
e1aa5d676710