CentOS7安装mysql

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安装mysql
# 配置环境变量，并立即更新
vi /etc/profile
export MYSQL_HOME="/usr/local/mysql"
export PATH="$PATH:$MYSQL_HOME/bin"
source /etc/profile

groupadd mysql #添加用户组mysql
useradd -r -g mysql mysql -d $MYSQL_HOME #添加用户mysql，指定其用户组是mysql，home路径是$MYSQL_HOME
passwd mysql #设置mysql用户的登陆密码

wget http://120.52.72.24/cdn.mysql.com/c3pr90ntc0td//Downloads/MySQL-5.7/mysql-5.7.16-linux-glibc2.5-x86_64.tar.gz -O /usr/local/src #glibc是编译过后的版本，不需要make install
cd /usr/local/src
tar -zxvf mysql-5.7.16-linux-glibc2.5-x86_64.tar.gz
mv /usr/local/src/mysql-5.7.16-linux-glibc2.5-x86_64 $MYSQL_HOME
chown -R mysql:mysql $MYSQL_HOME #更改$MYSQL_HOME权限为mysql:mysql

yum install -y perl-Module-Install.noarch

$MYSQL_HOME/bin/mysqld --initialize --explicit_defaults_for_timestamp --user=mysql --basedir=$MYSQL_HOME --datadir=$MYSQL_HOME/data #第一次启动

2016-12-08T05:12:08.916945Z 0 [Warning] InnoDB: New log files created, LSN=45790
2016-12-08T05:12:08.993901Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2016-12-08T05:12:09.048289Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: de6b7880-bd04-11e6-8efb-080027798ca2.
2016-12-08T05:12:09.048994Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2016-12-08T05:12:09.049893Z 1 [Note] A temporary password is generated for root@localhost: 0w=a_KV.gT_k

cp $MYSQL_HOME/support-files /etc/my.cnf #mysql服务启动配置文件
cp $MYSQL_HOME/support-files/mysql.server /etc/init.d/mysql #将mysql加入到可控制启动的服务的文件夹内，并命名mysql，即service可控制的服务名，至此可用service mysql start控制启动mysql
chkconfig --add mysql
chkconfig mysql on
service mysql start

mysql -u root -p
输入密码：0w=a_KV.gT_k
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456'; #第一次改密码为'123456'

mysqladmin -uroot -p123456 password '123' #第二次及以后改密码

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