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资源安装/Mysql双主部署.md
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资源安装/Mysql双主部署.md
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> 本文作者：丁辉
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# 部署 Mysql 双主
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[Mysql-Rpm文件下载](https://dev.mysql.com/downloads/repo/yum/)
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## 部署
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> 双节点都执行以下操作
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1. 下载 Mysql Rpm 文件
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```bash
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yum install -y wget
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wget https://dev.mysql.com/get/mysql80-community-release-el7-7.noarch.rpm
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```
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2. 安装 MySQL
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```bash
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yum install -y mysql80-community-release-el7-7.noarch.rpm
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yum -y install mysql-community-server --enablerepo=mysql80-community --nogpgcheck
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```
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3. 启动 MySQL Server
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```bash
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systemctl start mysqld
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systemctl enable mysqld
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systemctl status mysqld
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```
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## 配置
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1. 查看临时密码
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```bash
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grep 'temporary password' /var/log/mysqld.log
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```
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2. 修改临时密码并配置允许远程登录
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```sql
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ALTER USER 'root'@'localhost' IDENTIFIED BY 'password';
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USE mysql;
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UPDATE user SET host = '%' WHERE user = 'root';
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FLUSH PRIVILEGES;
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```
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### Mysql 1号主节点配置
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1. 停止数据库
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```bash
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systemctl stop mysqld
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```
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备份并编辑配置文件
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```bash
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cp /etc/my.cnf /etc/my.cnf.bak
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vi /etc/my.cnf
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```
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```bash
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[mysqld]
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pid-file=/var/run/mysqld/mysqld.pid
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socket=/var/lib/mysql/mysql.sock
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datadir=/var/lib/mysql
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log-error=/var/log/mysqld.log
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secure-file-priv=NULL
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# Disabling symbolic-links is recommended to prevent assorted security risks
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symbolic-links=0
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# 服务端默认utf8编码
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character-set-server=utf8mb4
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# 默认存储引擎
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default-storage-engine=INNODB
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# 主从配置
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log-bin=binlog
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server-id=121
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gtid-mode=on
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enforce-gtid-consistency=on
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log-slave-updates=on
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expire_logs_days=14
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# Compatible with versions before 8.0
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default_authentication_plugin=mysql_native_password
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skip-host-cache
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skip-name-resolve
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[client]
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#设置客户端编码
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default-character-set=utf8mb4
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[mysql]
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# 设置mysql客户端默认编码
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default-character-set=utf8mb4
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```
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2. 重新启动
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```bash
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systemctl start mysqld
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```
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3. 登录数据库授权
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```sql
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CREATE USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY 'password';
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GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%';
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flush privileges;
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SHOW MASTER STATUS; #此信息记录等会配置另外一台节点需要用
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```
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### Mysql 2号主配置
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1. 停止数据库
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```bash
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systemctl stop mysqld
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```
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备份并编辑配置文件
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```bash
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cp /etc/my.cnf /etc/my.cnf.bak
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vi /etc/my.cnf
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```
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```bash
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[mysqld]
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pid-file=/var/run/mysqld/mysqld.pid
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socket=/var/lib/mysql/mysql.sock
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datadir=/var/lib/mysql
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log-error=/var/log/mysqld.log
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secure-file-priv=NULL
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# Disabling symbolic-links is recommended to prevent assorted security risks
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symbolic-links=0
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# 服务端默认utf8编码
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character-set-server=utf8mb4
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# 默认存储引擎
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default-storage-engine=INNODB
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# 主从配置
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log-bin=binlog
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server-id=122
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gtid-mode=on
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enforce-gtid-consistency=on
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log-slave-updates=on
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expire_logs_days=14
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# Compatible with versions before 8.0
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default_authentication_plugin=mysql_native_password
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skip-host-cache
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skip-name-resolve
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[client]
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#设置客户端编码
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default-character-set=utf8mb4
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[mysql]
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# 设置mysql客户端默认编码
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default-character-set=utf8mb4
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```
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2. 重新启动
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```bash
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systemctl start mysqld
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```
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3. 登录数据库授权
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```sql
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CREATE USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY 'password';
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GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%';
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flush privileges;
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SHOW MASTER STATUS; #此信息记录等会配置另外一台节点需要用
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```
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### Mysql 1号主节点配置
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1. 开启同步
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```sql
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CHANGE MASTER TO
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MASTER_HOST='', #IP地址
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MASTER_USER='slave',
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MASTER_PASSWORD='password', #密码
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MASTER_PORT=3306,
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MASTER_LOG_FILE='binlog.000002', #节点2 binlog 信息
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MASTER_LOG_POS=821; #节点2 log_pos信息
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```
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2. 开启主从同步
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```sql
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start slave;
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```
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3. 查看同步状态
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```sql
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show slave status\G;
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```
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### Mysql 2号主节点配置
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1. 开启同步
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```sql
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CHANGE MASTER TO
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MASTER_HOST='', #IP地址
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MASTER_USER='slave',
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MASTER_PASSWORD='password', #密码
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MASTER_PORT=3306,
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MASTER_LOG_FILE='binlog.000002', #节点1 binlog 信息
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MASTER_LOG_POS=821; #节点1 log_pos信息
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```
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2. 开启主从同步
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```sql
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start slave;
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```
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3. 查看同步状态
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```sql
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show slave status\G;
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```
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## Mysql 配置密码等级
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```bash
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set global validate_password.policy=0;
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set global validate_password.mixed_case_count=0;
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set global validate_password.number_count=0;
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set global validate_password.special_char_count=0;
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set global validate_password.length=3;
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```
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> 1.修改密码强度等级为0，即是LOW;
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> 2.修改密码至少要包含的大写字母和小写字母的个数为0;
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> 3.修改密码至少要包含的数字个数为0;
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> 4.修改密码至少要包含的特殊字符的个数为0;
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> 5.修改密码的长度最小个数为3;
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