root@ubuntu:haoke# docker logs percona
Initializing database
mysqld: Can't create/write to file '/var/lib/mysql/is_writable' (Errcode: 13 - Permission denied)
2021-01-12T11:54:53.387051Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2021-01-12T11:54:53.389339Z 0 [ERROR] --initialize specified but the data directory exists and is not writable. Aborting.
2021-01-12T11:54:53.389373Z 0 [ERROR] Aborting

不能一直搜索mysqld: Can't create/write to file '/var/lib/mysql/is_writable' (Errcode: 13 - Permission denied)，一直搜索这个问题，我一直没有解决这个问题，因为该搜索Docker安装Percona的步骤的问题，从另一问题去搜索就会得到答案。其实就是设置权限的问题。

#创建容器
docker create --name percona -v /data/mysql-data:/var/lib/mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=root percona:5.7.23

就是在cd /data 中添加权限 ；chomd -R 777 data/mysql-data/

请参考https://www.jianshu.com/p/26bf28b48e47