[root@localhost download]# service mysqld start

Redirecting to /bin/systemctl start  mysqld.service

Job for mysqld.service failed because a timeout was exceeded. See "systemctl status mysqld.service" and "journalctl -xe" for details.

解决了一个安装包的问题，然后安装后mysql起不来啊

 more /etc/my.cnf |grep -v ^#

[root@localhost ~]# more /etc/my.cnf |grep -v ^#

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

symbolic-links=0

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

配置看起来都正常

systemctl status -l mysqld 找了错误日志/var/log/mysqld.log

  CGroup: /system.slice/mysqld.service

           ├─5472 /bin/sh /usr/bin/mysqld_safe

           └─5638 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock

Nov 04 17:21:49 localhost.localdomain systemd[1]: mysqld.service holdoff time over, scheduling restart.

Nov 04 17:21:49 localhost.localdomain systemd[1]: Starting MySQL Community Server...

Nov 04 17:21:49 localhost.localdomain mysqld_safe[5472]: 161104 17:21:49 mysqld_safe Logging to ‘/var/log/mysqld.log‘.

Nov 04 17:21:50 localhost.localdomain mysqld_safe[5472]: 161104 17:21:50 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

Nov 04 17:21:50 localhost.localdomain systemd[1]: Started MySQL Community Server.

tail 下日志然后搜索了下这个错误

Fatal error: Can‘t open and lock privilege tables: Table ‘mysql.host‘ doesn‘t exist

使用脚本初始化数据库，无效

scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql --ldata=http://www.mamicode.com/var/lib/mysql

权限不足，然后加了2个目录的权限

chown -R mysql /var/lib/mysql

chgrp -R mysql /var/lib/mysql

终于进来了

[root@localhost ~]# mysql

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

Your MySQL connection id is 3

Server version: 5.6.34 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> 

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Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist