mariadb

安装

yum -y install mariadb*

问题列表

• ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
  服务未启动service mariadb restart

启用handlesocket 插件

https://mariadb.com/blog/getting-started-mariadb-handlersocket-plugin

• root用户下执行
  INSTALL PLUGIN handlersocket SONAME 'handlersocket.so';
• 在/etc/my.cnf中的mysqld章节 配置，至少添加以下内容

  handlersocket_address="127.0.0.1"
  handlersocket_port="9998"
  handlersocket_port_wr="9999"

• 重新启动
  service mariadb restart

• 检查状态
  show global variables like 'handlersocket%'
  show plugins
  show processlist

• 安装客户端
  https://mariadb.com/kb/en/mariadb/handlersocket-client-libraries/
  https://github.com/ahiguti/HandlerSocket-Plugin-for-MySQL

问题列表

• handlersoceket 没有错误，但是连接不了
  selinux需要设置为permissive setenforce 0
  http://stackoverflow.com/questions/26520626/unable-to-start-handlersocket-with-mariadb

• [Warning] handlersocket: open_files_limit is too small.
  在/etc/my.cnf 中mysqld章节添加open_files_limit=10000，重启服务就可以了；
  10000 不要写太大，65535好像就是无效的
  https://ma.ttias.be/increase-open-files-limit-in-mariadb-on-centos-7-with-systemd/

来自为知笔记(Wiz)