mariadb-server安装后没有mysqld或mysql.server

所以...可能我是个白痴，但我被困住了。我只是在Digial Ocean上设置了CentOS 7，但似乎无法运行MariaDB / MySQL服务器。

一些输出

[root@hostname ~]# yum list installed |grep maria
mariadb.x86_64                        1:5.5.37-1.el7_0                @updates  
mariadb-libs.x86_64                   1:5.5.37-1.el7_0                @updates  
mariadb-server.x86_64                 1:5.5.37-1.el7_0                @updates  

这样就安装好了，我们至少可以看到客户端吗？

[root@hostname ~]# which mysql
/bin/mysql

让我们尝试启动服务器，只是为了好玩

[root@hostname ~]# service mysqld start
Redirecting to /bin/systemctl start  mysqld.service
Failed to issue method call: Unit mysqld.service failed to load: No such file or directory.
[root@hostname ~]# mysqld
-bash: mysqld: command not found
[root@hostname ~]# mysql.server start
-bash: mysql.server: command not found
[root@hostname ~]# 

这就是我迷路的地方。查看实际安装的内容，没有服务器/守护程序

[root@hostname ~]# ls -la /bin/my*
-rwxr-xr-x 1 root root 3419136 Jun 24 10:27 /bin/myisamchk
-rwxr-xr-x 1 root root 3290760 Jun 24 10:27 /bin/myisam_ftdump
-rwxr-xr-x 1 root root 3277032 Jun 24 10:27 /bin/myisamlog
-rwxr-xr-x 1 root root 3320200 Jun 24 10:27 /bin/myisampack
-rwxr-xr-x 1 root root 2914904 Jun 24 10:27 /bin/my_print_defaults
-rwxr-xr-x 1 root root 3533016 Jun 24 10:27 /bin/mysql
-rwxr-xr-x 1 root root  111587 Jun 24 10:24 /bin/mysqlaccess
-rwxr-xr-x 1 root root 3089712 Jun 24 10:27 /bin/mysqladmin
-rwxr-xr-x 1 root root 3253112 Jun 24 10:27 /bin/mysqlbinlog
lrwxrwxrwx 1 root root      26 Sep  8 03:06 /bin/mysqlbug -> /etc/alternatives/mysqlbug
-rwxr-xr-x 1 root root 3090832 Jun 24 10:27 /bin/mysqlcheck
-rwxr-xr-x 1 root root    4247 Jun 24 10:24 /bin/mysql_convert_table_format
-rwxr-xr-x 1 root root   24558 Jun 24 10:24 /bin/mysqld_multi
-rwxr-xr-x 1 root root   27313 Jun 24 10:24 /bin/mysqld_safe
-rwxr-xr-x 1 root root 3173968 Jun 24 10:27 /bin/mysqldump
-rwxr-xr-x 1 root root    7913 Jun 24 10:24 /bin/mysqldumpslow
-rwxr-xr-x 1 root root    3315 Jun 24 10:24 /bin/mysql_find_rows
-rwxr-xr-x 1 root root    1261 Jun 24 10:24 /bin/mysql_fix_extensions
-rwxr-xr-x 1 root root   34826 Jun 24 10:24 /bin/mysqlhotcopy
-rwxr-xr-x 1 root root 3082072 Jun 24 10:27 /bin/mysqlimport
-rwxr-xr-x 1 root root   16204 Jun 24 10:24 /bin/mysql_install_db
-rwxr-xr-x 1 root root 2923136 Jun 24 10:27 /bin/mysql_plugin
-rwxr-xr-x 1 root root   11578 Jun 24 10:24 /bin/mysql_secure_installation
-rwxr-xr-x 1 root root   17473 Jun 24 10:24 /bin/mysql_setpermission
-rwxr-xr-x 1 root root 3084760 Jun 24 10:27 /bin/mysqlshow
-rwxr-xr-x 1 root root 3104240 Jun 24 10:27 /bin/mysqlslap
-rwxr-xr-x 1 root root 3442464 Jun 24 10:27 /bin/mysqltest
-rwxr-xr-x 1 root root 2918416 Jun 24 10:27 /bin/mysql_tzinfo_to_sql
-rwxr-xr-x 1 root root 2995400 Jun 24 10:27 /bin/mysql_upgrade
-rwxr-xr-x 1 root root 2913960 Jun 24 10:27 /bin/mysql_waitpid
-rwxr-xr-x 1 root root    3888 Jun 24 10:24 /bin/mysql_zap

有人指出我在做什么错吗？

如果有人偶然发现，我在这里找到了解决方案：https : //ask.fedoraproject.org/en/question/43459/how-to-start-mysql-mysql-isnt-starting/

在下面重新发布

要在Fedora 20上启动MariaDB，请执行以下命令：

systemctl start mariadb.service

要在Fedora 20上自动启动MariaDB，请执行以下命令：

systemctl enable mariadb.service

启动MariaDB（仅执行一次）之后，执行以下命令：

/usr/bin/mysql_secure_installation

运行时：

yum install mysql

该命令默认会安装MariaDB而不是MySQL。

因此，请尝试以下命令：

yum list installed | grep mariadb

如果mariadb-server缺少，请尝试以下命令：

yum install mariadb-server

它安装服务器软件包，然后启动服务：

systemctl start mariadb

要么：

service mariadb start

我的问题就这样解决了。

服务名称是，mariadb因此您可以使用以下命令启动它：

service mariadb start

使用以下命令停止它：

service mariadb stop

并使用以下命令重新启动它：

service mariadb restart

查看是否mysqld在/usr/libexec/目录下。至少在CentOS 6.5中，通常的MySQL将服务器本身安装在此处。

另请参阅输出，systemctl list-units以查看您的MariaDB服务器的名称。

我在尝试启动mariadb服务时遇到了类似的问题

错误2002（HY000）：无法通过套接字'/var/lib/mysql/mysql.sock'连接到本地MySQL服务器

我认为问题出在不匹配的yum软件包中-有些是从特殊的mariadb存储库安装的，而另一些是从centos官方存储库安装的。因此，我必须删除自定义的yum repo条目，删除MariaDB软件包并重新安装mariadb-server，然后服务才能启动而不会出现问题。

@OP请选择最佳答案；@主持人请锁定问题；

遇到同样的问题，尝试了所提到的其他步骤，但均无济于事；我的问题是在退出su并运行后以root / sudo su身份登录，$ systemctl status mariadb我收到了

mariadb.service - MariaDB database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

然后我跑$ sudo systemctl enable mariadbrecieving

Created symlink from /etc/systemd/system/multi-user.target.wants/mariadb.service to /usr/lib/systemd/system/mariadb.service.

然后使用以下命令启动mariadb- $ sudo systemctl start mariadb没有错误/消息，因此应该不错，但对检查没有害处$ systemctl status mariadb

mariadb.service - MariaDB database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2018-10-17 10:07:00 CDT; 5min ago
  Process: 18093 ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID (code=exited, status=0/SUCCESS)
  Process: 18000 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=0/SUCCESS)
 Main PID: 18092 (mysqld_safe)
    Tasks: 20
   CGroup: /system.slice/mariadb.service
           ├─18092 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
           └─18261 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mariadb/mariadb.log --pid-file=/var/run/mariadb/mariadb.pid --socket=/var/lib/mysql/mysql.sock

Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: MySQL manual for more instructions.
Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: Please report any problems at http://mariadb.org/jira
Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: The latest information about MariaDB is available at http://mariadb.org/.
Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: You can find additional information about the MySQL part at:
Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: http://dev.mysql.com
Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: Consider joining MariaDB's strong and vibrant community:
Oct 17 10:06:58 centos-7.shared mariadb-prepare-db-dir[18000]: https://mariadb.org/get-involved/
Oct 17 10:06:58 centos-7.shared mysqld_safe[18092]: 181017 10:06:58 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
Oct 17 10:06:58 centos-7.shared mysqld_safe[18092]: 181017 10:06:58 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Oct 17 10:07:00 centos-7.shared systemd[1]: Started MariaDB database server.