使用YUM在Linux(CentOS 7)下安装mysql 5.7.18的教程详解

Red Hat Enterprise Linux 7 / Oracle Linux 7 (Architecture Independent), RPM Package  25.1K 
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(mysql57-community-release-el7-11.noarch.rpm)

shell> yum search libaio # search for info（Mysql安装需要以来libaio库，所以需要先安装libaio库）
shell> yum install libaio # install library
shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql
shell> cd /usr/local
shell> tar zxvf /path/to/mysql-VERSION-OS.tar.gz
shell> ln -s full-path-to-mysql-VERSION-OS mysql
shell> cd mysql
shell> mkdir mysql-files
shell> chmod 750 mysql-files
shell> chown -R mysql .
shell> chgrp -R mysql .
shell> bin/mysql_install_db --user=mysql  # MySQL 5.7.5 （mysql5.7.5选择使用这个命令，如果你的mysql是5.7.6及以上，不需要执行这个命令）
shell> bin/mysqld --initialize --user=mysql # MySQL 5.7.6 and up
shell> bin/mysql_ssl_rsa_setup       # MySQL 5.7.6 and up
shell> chown -R root .
shell> chown -R mysql data mysql-files
shell> bin/mysqld_safe --user=mysql &
# Next command is optional
shell> cp support-files/mysql.server /etc/init.d/mysql.server

[root@***** /]# cd ~ #这里有一个问题，不知道需要需要切换到 “~”目录，之前没有“~”，启动不成功，不确定是我sytemctl start mysqld.service命令输入错了还是别的原因。
[root@***** ~]# sytemctl start mysqld.service

[root@***** ~]# sytemctl status mysqld.service

grep'temporary
 password'/var/log/mysqld.log
2017-05-10T00:55:46.982233Z
 1 [Note] A temporary password is generated for root@localhost: 5C::+lMjqi+z

[root@****** ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.7.18

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'newpassword';
Query OK, 0 rows affected (0.00 sec)