Centos系统安装mysql服务错误解决

作者: 我就想取个名字
来源: 51数据库
2020-08-31

最近在CentOS release 6.3上安装了mysql，但是mysqladmin -u root password 123456命令的时候，却出现如下的错误：

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1./usr/bin/mysqladmin -u root password 123456

2./usr/bin/mysqladmin: connect to server at 'localhost' failed

3.error: 'Can't connect to local <a server through socket '/var/lib/mysql/mysql.sock' (2)'

4.Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!

发现可能的错误应该是mysqld服务守护进程没运行的原因，然后使用service mysqld status命令查看当前mysqld的服务状态，发现它确实是处于stopped状态，随后便想用service mysqld start命令启动守护进程，却又出现启动服务失败的信息：

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1.service mysqld start

2.<a Daemon failed to start.

3.Starting mysqld: [FAILED]

这下就头大了，启动服务竟然失败了。而且又没有任何相关的错误信息，所以只能查看它的错误日志，如下所示：
www.it165.net

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01.tail -n 20 /var/log/mysqld.log

02.120907 13:52:30 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

03.120907 13:52:30 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

04.120907 14:06:24 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

05./usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist

06.120907 14:06:24 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

07.120907 14:06:24 InnoDB: Initializing buffer pool, size = 8.0M

08.120907 14:06:24 InnoDB: Completed initialization of buffer pool

09.InnoDB: Log scan progressed past the checkpoint lsn 0 37356

10.120907 14:06:24 InnoDB: Database was not shut down normally!

11.InnoDB: Starting crash recovery.

12.InnoDB: Reading tablespace information from the .ibd files...

13.InnoDB: Restoring possible half-written data pages from the doublewrite

14.InnoDB: buffer...

15.InnoDB: Doing recovery: scanned up to log sequence number 0 44233

16.120907 14:06:24 InnoDB: Starting an apply batch of log records to the database...

17.InnoDB: Progress in percents: 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

18.InnoDB: Apply batch completed

19.120907 14:06:24 InnoDB: Started; log sequence number 0 44233

20.120907 14:06:24 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

21.120907 14:06:24 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pi

从中发现出现一个致命的错误，Can't open and lock privilege tables: Table 'mysql.host' doesn't exist！这样问题也就找到了，table ‘mysql.host’不存在的原因是新安装的mysql服务后，一般需要执行数据库初始化操作，从而生成与权限相关的表，执行命令如下：

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1./usr/bin/mysql_install_db --user=mysql

以上命令中的mysql_install_db与你安装的mysql服务位置有关，如果不知道在哪，可以使用find / -name mysql_install_db找到其位置，然后执行上面的命令。
然后在执行数据库服务启动操作，便可以设置你mysql数据库的用户及密码了：

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01.service mysqld start

02.Starting mysqld: [ OK ]

03.[root@host usr]# mysqladmin -u root pass<a target="_blank" class="keylink">word</a> 123456

04.[root@host usr]# mysql -u root -p

05.Enter pass<a target="_blank"class="keylink">word</a>:

06.Welcome to the MySQL monitor. Commands end with ; or \g.

07.Your MySQL connection id is 3

08.Server version: 5.1.61 Source distribution

09.

11.

12.Oracle is a registered trademark of Oracle Corporation and/or its

13.affiliates. Other names may be trademarks of their respective

14.owners.

15.

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