docker启动mysql docker启动mysql卡住

docker下安装mysqld后执行service mysqld start或者systemctl start mysql时会发现操作无法完成，此时需要通过映射目录的方式实现。

具体现象：service mysqld status会输出如下日志
New main PID 3991 does not belong to service, and PID file is not owned by root

解决方法如下：

方法1：创建容器时添加映射参数

创建容器的时候增加-v /sys/fs/cgroup:/sys/fs/cgroup

方法2：修改现有容器增加映射参数

1）关闭docker

service docker stop

2）进入容器目录

cd /var/lib/docker/containers/容器id/

3）修改hostconfig.json

 vi hostconfig.json，修改Binds后内容如下
"Binds": ["/sys/fs/cgroup:/sys/fs/cgroup"],

4）修改config.v2.json

vi config.v2.json,修改如下，添加MountPoints:

"MountPoints": {
"/sys/fs/cgroup": {
             "Source": "/sys/fs/cgroup",
             "Destination": "/sys/fs/cgroup",
             "RW": true,
             "Name": "",
             "Driver": "",
             "Type": "bind",
             "Propagation": "rprivate",
             "Spec": {
                 "Type": "bind",
                 "Source": "/sys/fs/cgroup",
                 "Target": "/sys/fs/cgroup"
             },
             "SkipMountpointCreation": false
         }
 },

5）启动docker

service docker start