启动MYSQL数据库时，报 ERROR! The server quit without updating PID file
[root@localhost bin]# ps -ef |grep mysql
root 155995 110447 0 03:24 pts/0 00:00:00 grep --color=auto mysql
[root@localhost bin]# service mysqld start
Starting MySQL.Logging to '/data/mysql/data/localhost.localdomain.err'.
2023-11-06T08:24:13.596845Z mysqld_safe The file /usr/local/mysql/bin/mysqld
does not exist or is not executable. Please cd to the mysql installation
directory and restart this script from there as follows:
./bin/mysqld_safe&
See http://dev.mysql.com/doc/mysql/en/mysqld-safe.html for more information
ERROR! The server quit without updating PID file (/data/mysql/data/localhost.localdomain.pid).
主要原因是我没有修改mysqld_safe文件中的安装目录和数据目录。
[root@localhost bin]# ./mysql
mysql mysql_config_editor mysqldumpslow mysql_secure_installation mysql_upgrade
mysqladmin mysqld mysql_embedded mysqlshow mysqlxtest
mysqlbinlog mysqld-debug mysqlimport mysqlslap
mysqlcheck mysqld_multi mysql_install_db mysql_ssl_rsa_setup
mysql_client_test_embedded mysqld_safe mysql_plugin mysqltest_embedded
mysql_config mysqldump mysqlpump mysql_tzinfo_to_sql
[root@localhost bin]# ./mysqld_safe --datadir=/data/mysql/data/
2023-11-06T08:32:36.755407Z mysqld_safe Logging to '/data/mysql/data//localhost.localdomain.err'.
2023-11-06T08:32:36.758791Z mysqld_safe error: log-error set to '/data/mysql/data//localhost.localdomain.err', however file don't exists. Create writable for user 'mysql'.
[root@localhost bin]# chown -R mysql:mysql /data/mysql/
[root@localhost bin]# chmod -R 777 /data/mysql/
[root@localhost bin]# ./mysqld_safe --datadir=/data/mysql/data/
2023-11-06T08:33:47.980123Z mysqld_safe Logging to '/data/mysql/data//localhost.localdomain.err'.
2023-11-06T08:33:47.983541Z mysqld_safe error: log-error set to '/data/mysql/data//localhost.localdomain.err', however file don't exists. Create writable for user 'mysql'.
修改完数据库可以启动了，开始修改数据库密码，又以下错误，原来是没有权限创建sock文件，做了软链接
[mysql@localhost bin]$ ./mysql -u root -p'S>Vqjfffwl2344444444455e2vJ'
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
[mysql@localhost bin]$ ln -s /var/lib/mysql/mysql.sock /tmp
[mysql@localhost bin]$ ./mysql -u root -p'S>qVwjffwle2evJ'
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.17
Copyright © 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> alter user 'root'@'localhost' identified by 'password';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql>
搞定。