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1. 启动服务

     systemctl list-unit-files | grep mysql # 1. 查看服务的名称 及其 状态
     systemctl is-active  mysql.service     # 2. 查看是否已启动
sudo systemctl start      mysql.service     # 3. 启动服务
     systemctl is-active  mysql.service     # 4. 再次查看是否已启动

2. 停止服务

     systemctl list-unit-files | grep mysql # 1. 查看服务的名称 及其 状态
     systemctl is-active  mysql.service     # 2. 查看是否已启动
sudo systemctl stop       mysql.service     # 3. 停止服务
     systemctl is-active  mysql.service     # 4. 再次查看是否已启动

3. 重启服务

     systemctl list-unit-files | grep mysql # 1. 查看服务的名称 及其 状态
     systemctl is-active  mysql.service     # 2. 查看是否已启动
sudo systemctl restart    mysql.service     # 3. 重启服务
     systemctl is-active  mysql.service     # 4. 再次查看是否已启动

4. 设置开机启动

     systemctl list-unit-files | grep mysql # 1. 查看服务的名称 及其 状态
     systemctl is-enabled mysql.service     # 2. 查看是否开机自动启动
sudo systemctl    enable  mysql.service     # 3. 设置开机自动启动
     systemctl is-enabled mysql.service     # 4. 再次查看是否开机自动启动

5. 禁止开机启动

     systemctl list-unit-files | grep mysql # 1. 查看服务的名称 及其 状态
     systemctl is-enabled mysql.service     # 2. 查看是否开机自动启动
sudo systemctl   disable  mysql.service     # 3. 禁止开机自动启动
     systemctl is-enabled mysql.service     # 4. 再次查看是否开机自动启动