centos8部署MySQL5.7故障集

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错误日志：

[root@confluence packages]# /etc/init.d/mysqld restart
 ERROR! MySQL server PID file could not be found!
Starting MySQL.2022-01-15T03:58:44.753030Z mysqld_safe error: log-error set to '/var/log/mariadb/mariadb_error.log', however file don't exists. Create writable for user'mysql'.
 ERROR! The server quit without updating PID file (/home/confluence/mysql/mysql_data/confluence.pid).
1.2.3.4.

根据日志提示，MySQL 无法启动是因为指定的日志文件 /var/log/mariadb/mariadb_error.log 不存在
touch 创建 /var/log/mariadb/mariadb_error.log，并修改权限为 mysql:mysql，该错误解决。

错误日志：

[root@confluence packages]# /etc/init.d/mysqld start
Starting MySQL.. ERROR! The server quit without updating PID file (/home/confluence/mysql/mysql_data/confluence.pid).
[root@confluence packages]#

1.2.3.

原因是 /etc/my.cnf 文件是空的，什么配置都没有。
查看 /etc/my.cnf，文件没有配置数据目录等信息，文件内容如下：

[root@confluence mysql]# cat /etc/my.cnf
#
# This group is read both both by the client and the server
# use it for options that affect everything
#
[client-server]

#
# include all files from the config directory
#
!includedir /etc/my.cnf.d

[root@confluence mysql]# 
1.2.3.4.5.6.7.8.9.10.11.12.13.
/etc/my.cnf.d 目录下只存在 client.cnf 一个文件，内容也是空的：[root@confluence mysql]# cat /etc/my.cnf.d/client.cnf 
#
# These two groups are read by the client library
# Use it for options that affect all clients, but not the server
#
[client]
# This group is not read by mysql client library,
# If you use the same .cnf file for MySQL and MariaDB,
# use it for MariaDB-only client options
[client-mariadb]

[root@confluence mysql]# 
1.2.3.4.5.6.7.8.9.10.11.12.

把 /etc/my.cnf 文件补充完整，问题即解决。

错误日志：

[root@confluence etc]# /etc/init.d/mysqld start
my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
Starting MySQL.my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
.. ERROR! The server quit without updating PID file (/home/confluence/mysql/mysql_data/confluence.pid).
[root@confluence etc]#

原因是因为 /etc/my.cnf 文件是从其它节点拷贝拷贝过来的，上传后默认的权限过大。把 /etc/my.cnf 文件的权限改成 644，重新启动 MySQL 则成功。

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