首先，执行订单时
mysql -u root -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)，它会出错。
第二，执行订单时
systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/etc/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 三 2019-10-30 01:29:29 CST; 20min ago
Process: 30824 ExecStart=/usr/bin/mysqld --defaults-file=/etc/mysql/my.cnf --datadir=/var/lib/mysql/data --socket=/var/run/mysqld/mysqld.sock User=mysql (code=exited, status=203/EXEC)
Main PID: 30824 (code=exited, status=203/EXEC)
10月 30 01:29:29 VM_0_6_centos systemd[1]: Started MySQL Server.
10月 30 01:29:29 VM_0_6_centos systemd[1]: Starting MySQL Server...
10月 30 01:29:29 VM_0_6_centos systemd[1]: mysqld.service: main process exited, code=exited, status=203/EXEC
10月 30 01:29:29 VM_0_6_centos systemd[1]: Unit mysqld.service entered failed state.
10月 30 01:29:29 VM_0_6_centos systemd[1]: mysqld.service failed.
第三，mysql的default_file是my.cnf：
1 # For advice on how to change settings please see
2 # http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
3
4 [mysqld]
5 #
6 # Remove leading # and set to the amount of RAM for the most important data
7 # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
8 # innodb_buffer_pool_size = 128M
9 #
10 # Remove the leading "# " to disable binary logging
11 # Binary logging captures changes between backups and is enabled by
12 # default. It's default setting is log_bin=binlog
13 # disable_log_bin
14 #
15 # Remove leading # to set options mainly useful for reporting servers.
16 # The server defaults are faster for transactions and fast SELECTs.
17 # Adjust sizes as needed, experiment to find the optimal values.
18 # join_buffer_size = 128M
19 # sort_buffer_size = 2M
20 # read_rnd_buffer_size = 2M
21 #
22 # Remove leading # to revert to previous value for default_authentication_plugin,
23 # this will increase compatibility with older clients. For background, see:
24 # https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentic ation_plugin
25 # default-authentication-plugin=mysql_native_password
26
27 datadir=/var/lib/mysql
28 socket=/var/lib/mysql/mysql.sock
29
30 log-error=/var/log/mysqld.log
31 pid-file=/var/run/mysqld/mysqld.pid
32
33 [mysql]
34
35 socket=/var/lib/mysql/mysql.sock
36 [client]
37 socket=/tmp/mysql.sock
第四，在我的机器上找不到mysql.sock，mysql.server和mysql_safe。安装mysql-server后，仍然出错。
yum install mysql-server
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Package mysql-community-server-8.0.18-1.el7.x86_64 already installed and latest version
Nothing to do
[root@VM_0_6_centos /root]# find ./* -name mysql.server
我该怎么办？