如何确定mariadb是否启动

可以通过以下步骤来确定MariaDB是否启动：

1. 打开终端或命令提示符窗口。
2. 在终端或命令提示符中输入以下命令：

   systemctl status mariadb

3. 如果MariaDB正在运行，将会看到类似以下内容的输出：

   ● mariadb.service - MariaDB 10.3.17 database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2020-01-23 14:19:29 EST; 3 weeks 6 days ago
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/
   Main PID: 1747 (mysqld)
   Status: "Taking your SQL requests now..."
   Tasks: 31 (limit: 4915)
   Memory: 145.4M
   CGroup: /system.slice/mariadb.service
           └─1747 /usr/sbin/mysqld --daemonize --pid-file=/run/mariadb/mariadb.pid

   Jan 23 14:19:27 centos7 systemd[1]: Starting MariaDB 10.3.17 database server...
   Jan 23 14:19:29 centos7 systemd[1]: Started MariaDB 10.3.17 database server.

4. 如果MariaDB未运行，将会看到类似以下内容的输出：

   ● mariadb.service - MariaDB 10.3.17 database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/

   Jan 23 14:19:27 centos7 systemd[1]: Starting MariaDB 10.3.17 database server...
   Jan 23 14:19:29 centos7 systemd[1]: Started MariaDB 10.3.17 database server.

其中 `Active: inactive (dead)` 表示MariaDB未运行。