centos7中安裝mysql

1.新建組、新建用戶
[root@ticent admin]# groupadd mysql
[root@ticent admin]# useradd -m -g mysql mysql
[root@ticent admin]# 
2.查看是否已經安裝，如已經安裝，需要先移除
[root@ticent admin]# rpm -qa | grep mysql
[root@ticent admin]# 
3.修改mysql用戶密碼
[root@ticent admin]# passwd mysql
4.下載
[mysql@ticent ~]$ wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-client-5.7.18-1.el7.x86_64.rpm
[mysql@ticent ~]$ wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-libs-5.7.18-1.el7.x86_64.rpm
[mysql@ticent ~]$ wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-common-5.7.18-1.el7.x86_64.rpm
[mysql@ticent ~]$ wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-server-5.7.18-1.el7.x86_64.rpm
[mysql@ticent ~]$ ll
總用量 157960
-rw-rw-r--. 1 mysql mysql  25079412 3月  20 17:40 mysql-community-client-5.7.18-1.el7.x86_64.rpm
-rw-rw-r--. 1 mysql mysql    277784 3月  20 17:40 mysql-community-common-5.7.18-1.el7.x86_64.rpm
-rw-rw-r--. 1 mysql mysql   2237888 3月  20 17:40 mysql-community-libs-5.7.18-1.el7.x86_64.rpm
-rw-rw-r--. 1 mysql mysql 128210634 6月   6 01:02 mysql-community-server-5.7.18-1.el7.x86_64.rpm

5.可以使用root用戶安裝，也可以使用mysql用戶安裝。若使用mysql，則需要先修改/etc/sudoers文件，如下，添加標記的內容。使用root則不需要設置。
[root@ticent admin]# vi /etc/sudoers

6.移除mariadb-libs
[mysql@ticent ~]$ sudo rpm -e mariadb-libs-5.5.52-1.el7.x86_64 --nodeps
7.安裝perl
[root@ticent mysql]# yum install perl
8.安裝mysql
[mysql@ticent ~]$ sudo rpm -ivh mysql-community-common-5.7.18-1.el7.x86_64.rpm 
警告：mysql-community-common-5.7.18-1.el7.x86_64.rpm: 頭V3 DSA/SHA1 Signature, 密鑰 ID 5072e1f5: NOKEY
準備中...                          ################################# [100%]
正在升級/安裝...
   1:mysql-community-common-5.7.18-1.e################################# [100%]
[mysql@ticent ~]$ sudo rpm -ivh mysql-community-libs-5.7.18-1.el7.x86_64.rpm 
警告：mysql-community-libs-5.7.18-1.el7.x86_64.rpm: 頭V3 DSA/SHA1 Signature, 密鑰 ID 5072e1f5: NOKEY
準備中...                          ################################# [100%]
正在升級/安裝...
   1:mysql-community-libs-5.7.18-1.el7################################# [100%]
[mysql@ticent ~]$ sudo rpm -ivh mysql-community-client-5.7.18-1.el7.x86_64.rpm 
警告：mysql-community-client-5.7.18-1.el7.x86_64.rpm: 頭V3 DSA/SHA1 Signature, 密鑰 ID 5072e1f5: NOKEY
準備中...                          ################################# [100%]
正在升級/安裝...
   1:mysql-community-client-5.7.18-1.e################################# [100%]
[mysql@ticent ~]$ sudo rpm -ivh mysql-community-server-5.7.18-1.el7.x86_64.rpm 
警告：mysql-community-server-5.7.18-1.el7.x86_64.rpm: 頭V3 DSA/SHA1 Signature, 密鑰 ID 5072e1f5: NOKEY
準備中...                          ################################# [100%]
正在升級/安裝...
   1:mysql-community-server-5.7.18-1.e################################# [100%]
9.初始化
[mysql@ticent ~]$ mysqld --initialize
10.啟動服務
[mysql@ticent ~]$ service mysqld start
11.查看臨時密碼
[mysql@ticent ~]$ cat /var/log/mysqld.log

12.使用初始密碼登錄，修改密碼
[mysql@ticent ~]$ mysql -u root -p
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123';

mysql> flush privileges;

13.再次登錄驗證成功