centos7安装mysql

sudo yum install wget

wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm

sudo rpm -ivh mysql57-community-release-el7-8.noarch.rpm

sudo yum install mysql-server

mysql -uroot -p
root
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

sudo chown -R root:root /var/lib/mysql

service mysqld restart
Enter password: root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

cat /var/log/mysqld.log  | grep password
2018-04-18T02:06:03.625052Z 1 [Note] A temporary password is generated for root@localhost: 1,,F6rSt?Q_I
2018-04-18T02:06:31.479870Z 2 [Note] Access denied for user 'root'@'localhost' (using password: YES)

mysql -u root -p
Enter password: 1,,F6rSt?Q_I
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.21

Copyright (c) 2000, 2018, 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> use mysql
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> SET PASSWORD = PASSWORD('root');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> SET PASSWORD = PASSWORD('root123456');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> SET PASSWORD = PASSWORD('1qaz@wsx');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> SET PASSWORD = PASSWORD('1qaz@wsxCMC');
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql>