mysql双主安装

mysql双主安装（一）

mysql双主安装之mysql软件安装

（两个节点都执行）

一、环境介绍

CentOS7.6+Mysql 8.0.18

二、安装步骤

2.1、环境检查

由于CentOS自带mariadb，在安装mysql时会出现冲突

因而在安装mysql前先卸载mariadb

 卸载系统自带mariadb-libs，否则会导致无法安装mysql-community-libs。

# rpm -qa|grep mariadb
mariadb-libs-5.5.64-1.el7.aarch64

2.2、下载安装包

https://downloads.mysql.com/archives/community/

2.3、 上传安装包到服务器并解压

（上传可以用WinSCP工具）

[root@mysqldb3 mysql-rpm]# tar -xvf mysql-8.0.18-1.el7.x86_64.rpm-bundle.tar
mysql-community-libs-8.0.18-1.el7.x86_64.rpm
mysql-community-devel-8.0.18-1.el7.x86_64.rpm
mysql-community-embedded-compat-8.0.18-1.el7.x86_64.rpm
mysql-community-libs-compat-8.0.18-1.el7.x86_64.rpm
mysql-community-common-8.0.18-1.el7.x86_64.rpm
mysql-community-test-8.0.18-1.el7.x86_64.rpm
mysql-community-server-8.0.18-1.el7.x86_64.rpm
mysql-community-client-8.0.18-1.el7.x86_64.rpm

2.4、安装

[root@mysqldb2 mysql-rpm]# rpm -ivh mysql-community-common-8.0.18-1.el7.x86_64.rpm 
warning: mysql-community-common-8.0.18-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-common-8.0.18-1.e################################# [100%]
[root@mysqldb2 mysql-rpm]# rpm -ivh mysql-community-libs-8.0.18-1.el7.x86_64.rpm 
warning: mysql-community-libs-8.0.18-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-libs-8.0.18-1.el7################################# [100%]
[root@mysqldb2 mysql-rpm]# rpm -ivh mysql-community-client-8.0.18-1.el7.x86_64.rpm 
warning: mysql-community-client-8.0.18-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-client-8.0.18-1.e################################# [100%]
[root@mysqldb2 mysql-rpm]# rpm -ivh mysql-community-server-8.0.18-1.el7.x86_64.rpm 
warning: mysql-community-server-8.0.18-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-server-8.0.18-1.e################################# [100%]

2.5、修改配置文件

[root@mysqldb1 soft]# vi /etc/my.cnf 
先把/etc/my.cnf配置文件中的"default-authentication-plugin=mysql_native_password"的注释去掉
port=6612
lower_case_table_names=1
max_connections=2000
log_bin_trust_function_creators=1

2.6、启动mysql服务

systemctl start mysqld

2.7、查看密码文件

MySQL会给我们在/var/log/mysqld.log下，为root用户生成了一个新的密码
查看初始化密码：
grep 'temporary password' /var/log/mysqld.log
[root@mysqldb3 mysql-rpm]# grep 'temporary password' /var/log/mysqld.log
2019-03-08T08:56:56.984943Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: efkAnA)S1py,

2.8、登录并修改密码

mysql -uroot -p

mysql> alter user 'root'@'localhost' identified with mysql_native_password by 'Hankey12#$';
Query OK, 0 rows affected (0.03 sec)

mysql> select host,user,plugin from mysql.user;
+-----------+------------------+-----------------------+
| host      | user             | plugin                |
+-----------+------------------+-----------------------+
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session    | caching_sha2_password |
| localhost | mysql.sys        | caching_sha2_password |
| localhost | root             | mysql_native_password |
+-----------+------------------+-----------------------+
4 rows in set (0.00 sec)

mysql> 

2.9、远程客户端登录设置

上图中的这个root用户就铁定不能从远程登录，其实略作修改即可
update mysql.user set plugin='mysql_native_password' where user='root'; #若plugin的值为mysql_native_password正常则不用修改 
同时，上图的root用户也不能从远程登录，而root的原因是由于host的类型只允许本机 
update mysql.user set host='%' where user='root'; 
执行完成后，刷新权限 
flush privileges; 
即可使用root远程登录