CentOS安装MySql

一、下载

普通的下载安装，直接就复制其他帖子了；参考贴

两种下载方式：1、下载上传；2、直接wget下载；

1、下载上传

下载地址：https://www.mysql.com/downloads/

点击第一个链接地址，进入MySQL官方网站，单击“Downloads”下载Tab页，进入下载界面

进入下拉下载列表，选择在CentOS7上tar包安装

然后使用FTP工具上传到服务器；

2、wget下载

先获取连接

进入到服务器某目录下，然后输入命令

# wget https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.26-1.el7.x86_64.rpm-bundle.tar

下载速度非常6，下载完毕；

二、安装

查看mysql是否安装，如果安装了，卸载mysql

rpm -qa|grep mysql

卸载之前的

rpm -e --nodeps mysql-libs-5.1.73-7.el6.x86_64

创建目录

# mkdir -p /usr/local/mysql

 解压

# tar xvf mysql-5.7.26-1.el7.x86_64.rpm-bundle.tar  -C /usr/local/mysql
mysql-community-client-5.7.26-1.el7.x86_64.rpm
mysql-community-common-5.7.26-1.el7.x86_64.rpm
mysql-community-devel-5.7.26-1.el7.x86_64.rpm
mysql-community-embedded-5.7.26-1.el7.x86_64.rpm
mysql-community-embedded-compat-5.7.26-1.el7.x86_64.rpm
mysql-community-embedded-devel-5.7.26-1.el7.x86_64.rpm
mysql-community-libs-5.7.26-1.el7.x86_64.rpm
mysql-community-libs-compat-5.7.26-1.el7.x86_64.rpm
mysql-community-minimal-debuginfo-5.7.26-1.el7.x86_64.rpm
mysql-community-server-5.7.26-1.el7.x86_64.rpm
mysql-community-server-minimal-5.7.26-1.el7.x86_64.rpm
mysql-community-test-5.7.26-1.el7.x86_64.rpm

安装

依次执行（几个包有依赖关系，所以执行有先后）下面命令安装

# cd /usr/local/mysql/
# rpm -ivh mysql-community-libs-5.7.26-1.el7.x86_64.rpm
# rpm -ivh mysql-community-client-5.7.26-1.el7.x86_64.rpm
# rpm -ivh mysql-community-server-5.7.26-1.el7.x86_64.rpm

注：如果上述操作出现报错如：

warning: mysql-community-libs-5.7.26-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
    mysql-community-common(x86-64) >= 5.7.9 is needed by mysql-community-libs-5.7.26-1.el7.x86_64
    mariadb-libs is obsoleted by mysql-community-libs-5.7.26-1.el7.x86_64

解决方法是：

后面加上  --force --nodeps 如：

# rpm -ivh mysql-community-libs-5.7.26-1.el7.x86_64.rpm --force --nodeps 

安装结束

三、初始化数据库

1、初始化命令

# mysqld --initialize --user=mysql

2、查看初始化的密码

# cat /var/log/mysqld.log

显示内容如下：

2019-05-19T05:53:03.738829Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentat
ion for more details).2019-05-19T05:53:03.739304Z 0 [ERROR] Can't find error-message file '/usr/share/mysql/errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuratio
n directive.2019-05-19T05:53:08.434726Z 0 [Warning] InnoDB: New log files created, LSN=45790
2019-05-19T05:53:08.872448Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2019-05-19T05:53:08.954300Z 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 U
UID: 0fb455fb-6560-11e8-a2f0-000c29c94111.2018-05-19T05:53:08.956569Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2019-05-19T05:53:08.958761Z 1 [Note] A temporary password is generated for root@localhost: ?2nt4!-t&s#M

注：上述标红位置就是初始化密码

3、启动数据库

# service mysqld start

4、登陆

# mysql -u root -p

输入上述默认密码，登陆成功；

5、修改密码

#修改密码
mysql>ALTER USER 'root'@'localhost' IDENTIFIED BY '123';

# 查询user表
mysql>select User,host,authentication_string from user;

# 修改user表，把Host表内容修改为%
mysql> update user set host='%' where host='localhost';

#删除root用户的其他host
mysql> delete from user where host != '%';

#刷新退出
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> exit;

  注：上述3、4、5步如有报错，如下：

ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

解决方法：修改/etc/my.cnf

# 添加以下内容到/etc/my.conf:
[client]
socket = /Data/mydata/mysql.sock
[mysqld]
socket = /Data/mydata/mysql.sock