The database is shut down in the afternoon, ready to modify modify the root through skip-granted-tables password, and then shut down, restart unsuccessful.
[root@iZ2zehmkcpexiu333gfymtZ ~]# service mysqld start
MySQL Daemon failed to start.
Starting mysqld: [FAILED]
mysql After closing does not start normally, suggesting that failed to start.
View mysql start the log:
tail -20 /var/log/mysqld.log
180516 18:33:07 [ERROR] /usr/libexec/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13)
180516 18:33:07 [ERROR] Can't start server: can't create PID file: Permission denied
180516 18:33:07 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
180516 18:33:20 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
180516 18:33:20 InnoDB: Initializing buffer pool, size = 8.0M
180516 18:33:20 InnoDB: Completed initialization of buffer pool
180516 18:33:20 InnoDB: Started; log sequence number 0 1455648
180516 18:33:20 [ERROR] /usr/libexec/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13)
180516 18:33:20 [ERROR] Can't start server: can't create PID file: Permission denied
180516 18:33:20 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid endedTips can not start the service, you can not create PID file, insufficient permissions
Can't create/write to file '/var/run/mysqld/mysqld.pid' 提示不能创建pid文件，目录为 /var/run/mysqld/ 看了下目录权限为nobody And using the mysql mysql user runs, the rights to modify chmod 777 / var / run / mysqld -R
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Reset Password steps:
1, first check if mysql start, find the path to mysqld_safe
[root@iZ2zehmkcpexiu333gfymtZ ~]# ps -ef | grep mysqld
root 8702 1 0 18:35 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql
mysql 8804 8702 0 18:35 ? 00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
root 9106 9069 0 18:45 pts/4 00:00:00 grep mysqld 2, shut down mysqld
[root@iZ2zehmkcpexiu333gfymtZ ~]# service mysqld stop
Stopping mysqld: [ OK ]3, --skip-grant-tables to skip the grant tables start mysql, mysql restart when this place needs attention, this time can only be connected in this mysql server does not require a user name and password, you can directly mysql command line, you can after this command in price & means that the process linked to run in the background
[root@iZ2zehmkcpexiu333gfymtZ ~]# /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql --skip-grant-tables
180516 18:47:14 mysqld_safe Logging to '/var/log/mysqld.log'.
180516 18:47:14 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql4, enter mysql, can be directly manipulated
[root@iZ2zehmkcpexiu333gfymtZ ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.73 Source distribution
Copyright (c) 2000, 2013, 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> 5, the user query tables, wherein% represents the corresponding Host allows any host to access, to limit access to specific ip, ip modify the specified line
mysql> select * from user \G;
*************************** 1. row ***************************
Host: %
User: root
Password: *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Reload_priv: Y
Shutdown_priv: Y
Process_priv: Y
File_priv: Y
Grant_priv: Y
References_priv: Y
Index_priv: Y
Alter_priv: Y
Show_db_priv: Y
Super_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Execute_priv: Y
Repl_slave_priv: Y
Repl_client_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Create_user_priv: Y
Event_priv: Y
Trigger_priv: Y
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
1 row in set (0.00 sec)6, modify the root password, refresh permission, change your password MYSQL different versions in different ways (ps: remember to refresh every time you modify the permissions)
mysql> update user set Password=password('123456');
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> 7, close mysql, mysql restart
[root@iZ2zehmkcpexiu333gfymtZ ~]# ps -ef | grep mysql
root 9314 9052 0 18:47 pts/3 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql --skip-grant-tables
mysql 9416 9314 0 18:47 pts/3 00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --skip-grant-tables --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
root 9798 9069 0 19:02 pts/4 00:00:00 grep mysql
[root@iZ2zehmkcpexiu333gfymtZ ~]# killall mysqld_safe
[root@iZ2zehmkcpexiu333gfymtZ ~]# kill -7 9314
[root@iZ2zehmkcpexiu333gfymtZ ~]# service mysqld start
Starting mysqld: [ OK ]
[root@iZ2zehmkcpexiu333gfymtZ ~]#