mysql数据库的安装
1、【5.7版本】
# wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm
安装 yum repo文件
# yum localinstall mysql80-community-release-el7-1.noarch.rpm
查看 YUM 仓库关于 MySQL 的所有仓库列表
# yum repolist all | grep mysql
只查看启用的
# yum repolist enabled | grep mysql
安装 YUM 管理工具包，此包提供了 yum-config-manager 命令工具
# yum install yum-utils
禁用 8.0
# yum-config-manager --disable mysql80-community
启用 5.7
# yum-config-manager --enable mysql57-community
或手动修改
# Enable to use MySQL 5.7
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=1 # 这里改为 1, 当然其他的版本就需要改为 0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
再次确认启用的 MySQL 仓库
yum repolist enabled | grep mysql
开始安装 MySQL
# yum install -y mysql-community-server
启动
# systemctl start mysqld.service
查看状态
# systemctl status mysqld.service
开机自启动
# systemctl enable mysqld.server
查看监听端口，默认 3306
# ss -natl |grep 3306
查看原有密码
grep 'temporary password' /var/log/mysqld.log
修改密码
mysqladmin -p'原密码' password '新密码'
2、【8.0版本】
先清掉之前装的mysql的环境
[root@rpm-mysql ~]# rpm -qa |grep -i mysql
mysql80-community-release-el7-2.noarch
[root@rpm-mysql ~]# yum history undo 9
[root@rpm-mysql ~]# rpm -e mysql80-community-release
[root@rpm-mysql yum.repos.d]# rm -rf /var/lib/mysql/
[root@rpm-mysql yum.repos.d]# rm -rf /etc/my.cnf
安装mysql
[root@server mysql]# wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.14-1.el7.x86_64.rpm-bundle.tar
[root@rpm-mysql ~]# tar xf mysql-8.0.14-1.el7.x86_64.rpm-bundle.tar
[root@rpm-mysql ~]# yum -y install net-tools
[root@rpm-mysql ~]# rpm -ivh mysql-community-server-8.0.14-1.el7.x86_64.rpm mysql-community-client-8.0.14-1.el7.x86_64.rpm mysql-community-common-8.0.14-1.el7.x86_64.rpm mysql-community-libs-8.0.14-1.el7.x86_64.rpm
启动服务
[root@xiaochen ~]# systemctl restart mysqld
[root@xiaochen ~]# systemctl enable mysqld
[root@node01 ~]# ss -antp | grep "mysqld"
LISTEN 0 80 :::3306 :::* users:(("mysqld",pid=2293,fd=22))
=====================修改密码===================================
获取root用户的临时密码，并修改
[root@node01 ~]# grep "password" /var/log/mysqld.log
2017-03-09T05:48:24.711787Z 1 [Note] A temporary password is generated for root@localhost: >DK+,(%2qNl&
2017-03-09T05:51:32.429509Z 3 [Note] Access denied for user 'root'@'localhost' (using password: NO)
修改root用户密码方法1：
# mysql -u root -p
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Www.1.com';
mysql> FLUSH PRIVILEGES; >>>>刷新授权表
mysql> exit
修改root用户密码方法2：
[root@node01 ~]# mysqladmin -u root -p password "Www.2.com"
Enter password:
实验环境不知道root密码的操作方法如下
[root@xiaochen day4]# systemctl stop mysqld
[root@xiaochen day4]# rm -rf /var/lib/mysql
[root@xiaochen day4]# systemctl restart mysqld
[root@xiaochen day4]# grep password /var/log/mysqld.log
2017-08-04T03:31:32.983327Z 1 [Note] A temporary password is generated for root@localhost: krqK<_wQg8RF
[root@xiaochen day4]# mysql -p
Enter password:
生产环境不知道root密码的操作如下:
[root@xiaochen ~]# systemctl stop mysqld
[root@xiaochen ~]# vim /etc/my.cnf
skip-grant-tables
[root@xiaochen ~]# systemctl restart mysqld
[root@xiaochen ~]# mysql
mysql> update mysql.user set authentication_string='' where user='root' and Host='localhost';
mysql> flush privileges;
mysql> select user,authentication_string,host,password_expired from mysql.user;
[root@xiaochen 7]# vim /etc/my.cnf
#skip-grant-tables
[root@xiaochen 7]# systemctl restart mysqld
将mysql的密码重置为空之后，重新修改mysql的密码
[root@mysql ~]# mysqladmin -uroot -p password "Www1.baidu.com"
