1.安装

1.查看yum列表，发现没有mysql
[root@server-mysql src]# yum list mysql
    已加载插件：fastestmirror
    Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
    Loading mirror speeds from cached hostfile
     * base: centos.ustc.edu.cn * extras: centos.ustc.edu.cn * updates: centos.ustc.edu.cn 错误：没有匹配的软件包可以列出 2.使用wget下载一个mysql的repo源 [root@server-mysql src]# wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm -bash: wget: 未找到命令 3.发现wget也没有，那就安装一个wget [root@server-mysql src]# yum list wget 已加载插件：fastestmirror Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast Loading mirror speeds from cached hostfile * base: centos.ustc.edu.cn * extras: centos.ustc.edu.cn * updates: centos.ustc.edu.cn 可安装的软件包 wget.x86_64 1.14-15.el7_4.1 base [root@server-mysql src]# yum -y install wget.x86_64 ...... 依赖关系解决 ======================================================================================== Package 架构 版本 源 大小 ======================================================================================== 正在安装: wget x86_64 1.14-15.el7_4.1 base 547 k 事务概要 ======================================================================================== 安装 1 软件包 总下载量：547 k 安装大小：2.0 M Downloading packages: wget-1.14-15.el7_4.1.x86_64.rpm | 547 kB 00:00:10 Running transaction check Running transaction test Transaction test succeeded Running transaction 正在安装 : wget-1.14-15.el7_4.1.x86_64 1/1 验证中 : wget-1.14-15.el7_4.1.x86_64 1/1 已安装: wget.x86_64 0:1.14-15.el7_4.1 完毕！ 4.在次下载mysql的repo源 [root@server-mysql src]# wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm --2018-09-08 14:45:20-- http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm 正在解析主机 repo.mysql.com (repo.mysql.com)... 104.124.241.153 正在连接 repo.mysql.com (repo.mysql.com)|104.124.241.153|:80... 已连接。 已发出 HTTP 请求，正在等待回应... 200 OK 长度：6140 (6.0K) [application/x-redhat-package-manager] 正在保存至: “mysql-community-release-el7-5.noarch.rpm” 100%[========================================================>] 6,140 --.-K/s 用时 0.001s 2018-09-08 14:45:20 (8.39 MB/s) - 已保存 “mysql-community-release-el7-5.noarch.rpm” [6140/6140]) 5.用命令查看当前目录，已经下载好了 [root@server-mysql src]# ll | grep mysql -rw-r--r--. 1 root root 6140 11月 12 2015 mysql-community-release-el7-5.noarch.rpm 6.安装一下 [root@server-mysql src]# rpm -ivh mysql-community-release-el7-5.noarch.rpm 准备中... ################################# [100%] 正在升级/安装... 1:mysql-community-release-el7-5 ################################# [100%] 7.再次查看yum列表，发现已经有mysql的包了 [root@server-mysql src]# yum list mysql 已加载插件：fastestmirror mysql-connectors-community | 2.5 kB 00:00:00 mysql-tools-community | 2.5 kB 00:00:00 mysql56-community | 2.5 kB 00:00:00 (1/3): mysql-connectors-community/x86_64/primary_db | 26 kB 00:00:00 (2/3): mysql-tools-community/x86_64/primary_db | 45 kB 00:00:00 8.执行安装(会替换自带的mariadb库) [root@server-mysql src]# yum -y install mysql-server 已加载插件：fastestmirror ....... 已安装: mysql-community-libs.x86_64 0:5.6.41-2.el7 mysql-community-server.x86_64 0:5.6.41-2.el7 作为依赖被安装: mysql-community-client.x86_64 0:5.6.41-2.el7 mysql-community-common.x86_64 0:5.6.41-2.el7 net-tools.x86_64 0:2.0-0.22.20131004git.el7 perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7 perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 perl-DBI.x86_64 0:1.627-4.el7 perl-Data-Dumper.x86_64 0:2.145-3.el7 perl-IO-Compress.noarch 0:2.061-2.el7 perl-Net-Daemon.noarch 0:0.48-5.el7 perl-PlRPC.noarch 0:0.2020-14.el7 替代: mariadb-libs.x86_64 1:5.5.56-2.el7 完毕！ 

2.初始化

1.尝试进入mysql，  报错了，是没有权限
[root@server-mysql src]# mysql -u root
    ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

2.查看mysql所属的用户，发现是mysql
[root@server-mysql src]# ll /var/lib/ | grep mysql
    drwxr-xr-x. 2 mysql   mysql      6 6月  15 21:36 mysql
    drwxr-x---. 2 mysql   mysql      6 6月  15 21:36 mysql-files

3.将其更改为当前用户(root)
[root@server-mysql src]# chown -R root:root /var/lib/mysql*
[root@server-mysql src]# ll /var/lib/ | grep mysql
    drwxr-xr-x. 2 root    root       6 6月  15 21:36 mysql
    drwxr-x---. 2 root    root       6 6月  15 21:36 mysql-files

4.重启mysql
[root@server-mysql src]# systemctl restart mysqld

5.再次进入数据库，并查看已有数据库
[root@server-mysql src]# mysql -u root
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 3
    Server version: 5.6.41 MySQL Community Server (GPL)

    Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.

    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | +--------------------+ 3 rows in set (0.00 sec) 

3.设置/修改密码

方式一：
    1.登陆到mysql中，将密码修改为root
    mysql> set password for root@localhost = password('root');
        Query OK, 0 rows affected (0.00 sec)

    2.退出mysql
    mysql> exit;
        Bye

    3.再次登陆需要使用密码登陆
    [root@server-mysql src]# mysql -u root -p Enter password: root 方式二： 1.登陆到mysql中，切换到mysql库 mysql> use mysql; 2.直接更新user表 mysql> update user set password=password('root') where user='root' and host='localhost'; 3.刷新权限表 mysql> flush privileges; 方式三： 使用navicat修改，需要使用navicat连接上这个数据库，见文章最后有图示 

4.修改远程连接权限

1.切换到mysql库
mysql> use mysql;
    Database changed

2.查看用户和能连接的主机, 发现root用户只能在本机连接(host中地址都是代表本机)，不能远程用navicat连接
mysql> select user, host from user where user = 'root';
    +------+--------------+
    | user | host         | +------+--------------+ | root | 127.0.0.1 | | root | ::1 | | root | localhost | | root | server-mysql | +------+--------------+ 4 rows in set (0.00 sec) 3.修改用户访问的地址 mysql> Grant all privileges on *.* to root@'%' identified by 'root' with grant option; Query OK, 0 rows affected (0.00 sec) 说明：*.*指对数据的所有权限(增删改查), root指连接上来的用户名, ‘%’指所有外部ip地址都可以连接上来，如果要指定地址可以这样写 ‘100.100.100.100’, identified by 后跟的是连接上来的密码 4.再次查看, 发现root用户多了一个主机地址（%） mysql> select user, host from user where user = 'root'; +------+--------------+ | user | host | +------+--------------+ | root | % | | root | 127.0.0.1 | | root | ::1 | | root | localhost | | root | server-mysql | +------+--------------+ 5 rows in set (0.00 sec) 5.刷新一下权限表 mysql> flush privileges; Query OK, 0 rows affected (0.01 sec) 6.开放端口 [root@server-mysql src]# firewall-cmd --add-port=3306/tcp --permanent success [root@server-mysql src]# firewall-cmd --reload success 

5.使用navicat连接数据库

 

 

 

 

6.使用navicat修改用户密码