前言

小编在Linux虚拟机上，使用命令安装mysql后，使用命令启动mysql时出现了一个错误，这个解决问题的过程很有意思，下面具体的来看一下吧。

一系列安装mysql的命令

1.安装mysql

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm //下载RPM包
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum update
yum install mysql-server

2.安装中

注意在执行命令的过程中，会出现这样一句话，输入"y"后，继续执行。

is this ok? [y/d/N]

安装mysql后

1.检查是否安装mysql的命令，可见已经成功安装mysql

[root@localhost admin]# rpm -qa |grep mysql
mysql-community-libs-5.6.42-2.el7.x86_64
mysql-community-client-5.6.42-2.el7.x86_64
mysql-community-common-5.6.42-2.el7.x86_64
mysql-community-release-el7-5.noarch
mysql-community-server-5.6.42-2.el7.x86_64

2.执行命令 mysqld --initialize时，发生了下面的错误。

[root@localhost admin]# mysqld --initialize
2018-10-29 23:16:46 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-10-29 23:16:46 0 [Note] mysqld (mysqld 5.6.42) starting as process 66214 ...
2018-10-29 23:16:46 66214 [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root!

2018-10-29 23:16:46 66214 [ERROR] Aborting

2018-10-29 23:16:46 66214 [Note] Binlog end
2018-10-29 23:16:46 66214 [Note] mysqld: Shutdown complete

关键思路

1.目的

我的目的是打开mysql数据库，不是初始化，所以我使用了另一篇博客中给出的命令，成功打开mysql数据库并创建了mysql用户。

2.打开mysql服务的命令

systemctl start mysql

查看mysql状态

[admin@localhost Desktop]$ systemctl status mysql
● mysqld.service - MySQL Community Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2018-10-29 23:02:14 PDT; 37min ago
  Process: 65641 ExecStartPost=/usr/bin/mysql-systemd-start post (code=exited, status=0/SUCCESS)
  Process: 65504 ExecStartPre=/usr/bin/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 65640 (mysqld_safe)
   CGroup: /system.slice/mysqld.service
           ├─65640 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
           └─65806 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql -...

Oct 29 23:02:09 localhost.localdomain mysql-systemd-start[65504]: 2018-10-29 ...
Oct 29 23:02:10 localhost.localdomain mysql-systemd-start[65504]: 2018-10-29 ...
Oct 29 23:02:10 localhost.localdomain mysql-systemd-start[65504]: PLEASE REME...
Oct 29 23:02:10 localhost.localdomain mysql-systemd-start[65504]: To do so, s...
Oct 29 23:02:10 localhost.localdomain mysql-systemd-start[65504]: /usr/bin/my...
Oct 29 23:02:10 localhost.localdomain mysql-systemd-start[65504]: /usr/bin/my...
Oct 29 23:02:10 localhost.localdomain mysql-systemd-start[65504]: Alternative...
Oct 29 23:02:11 localhost.localdomain mysqld_safe[65640]: 181029 23:02:11 mys...
Oct 29 23:02:11 localhost.localdomain mysqld_safe[65640]: 181029 23:02:11 mys...
Oct 29 23:02:14 localhost.localdomain systemd[1]: Started MySQL Community Ser...
Hint: Some lines were ellipsized, use -l to show in full.

3.创建mysql用户命令

[root@localhost Desktop]# mysqladmin -uroot password
Enter password:

4.登录mysql

[root@localhost Desktop]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 17
Server version: 5.6.42 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

小结

成功安装了mysql数据库并打开服务，创建用户，接下来就可以好好地操作mysql数据库啦！

感谢您的访问！

【Linux】Centos7安装mysql数据库

前言