1、修改配置文件/etc/mysql/conf.d/docker.cnf /etc/mysql/conf.d/mysql.cnf
docker cp mymysql:/etc/mysql/conf.d/docker.cnf ./docker.cnf
docker cp ./docker.cnf mymysql:/etc/mysql/conf.d/docker.cnf
容器內需下載vim才能編輯, 將配置文件修改後複製到docker容器內
performance_schema_max_table_instances=400
table_definition_cache=400
table_open_cache=256
performance_schema = off
2、重啓docker 啓動容器
3、內存佔用下降