快速安装mysql5.7

1、检查我们的yum源，我们服务器的yum源必须要是正常的，不管是本地源还是网络源都可以。

yum.repos.d]# cat Centos7.repo 
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#
 
[base]
name=CentOS-$releasever - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#released updates 
[updates]
name=CentOS-$releasever - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/centosplus/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/contrib/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

2、检查我们的网关（再这个绝对路径，可能有些人的网卡名称不是这个 /etc/sysconfig/network-scripts/ifcfg-ens33）

3、

ping baidu.com #看看能不能通
4、我们的服务器需要拥有wget这个命令

yum install -y wget

5、我们要下载MySQL的yum源配置

wget http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

6、安装MySQL的yum源

yum -y install mysql57-community-release-el7-11.noarch.rpm

7、使用yum方式安装MySQL5.7（下载需要点时间，我们可以在网速比较好的地方下载）

yum -y install mysql-server --nogpgcheck --nogpgcheck #不校验数字签名

8、MySQL5.7的开启关闭和开机自启命令

systemctl start mysqld.service 
systemctl status mysql.service

9、登录mysql前需找到mysql的默认密码 cat /var/log/mysqld.log| grep password

[root@server99 ~]$ cat /var/log/mysqld.log| grep password 
2022-11-02T15:01:52.976608Z 1 [Note] A temporary password is generated for root@localhost: !Th7<vMBA2w_

10、登录mysql

因为MySQL的默认密码具有特殊符号，所以我们要用单引号’ '来去除特殊符号的含义

mysql -uroot -p’!Th7 11登陆不上 显示密码过期
设置/etc/my.conf

skip-grant-tables

直接登录后设置新密码

update mysql.user set authentication_string=password('123123') where user='root';

退出MySQL

设置/etc/my.conf

#skip-grant-tables

回退配置后重新启动，登录新密码即可

 mysql -uroot -p123123