CentOS7.X搭建MySQL集群(互为主从)

2021-10-31 14:14:17

MySQL集群(双工、多工)

  1. 参考链接
  2. 参考链接

  3. 准备2台服务器假设IP为

    # 192.168.0.11
# 192.168.0.12

  4. 安装前的准备

    yum install \
lua \
vim \
git \
gcc \
gcc-c++ \
wget \
make \
cmake \
automake \
autoconf \
libaio \
libtool \
net-tools \
bison-devel \
libaio-devel \
ncurses-devel \
perl-Data-Dumper \
-y

  5. 获取源码资源包

    wget http://repo.mysql.com/mysql57-community-release-el7.rpm

  6. 安装源码资源包

    rpm -ivh mysql57-community-release-el7.rpm

  7. 通过资源包安装mysql

    yum install mysql-server -y

  8. 修改my.conf

    > /etc/my.cnf

vim /etc/my.cnf

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
datadir=/data/mysql
character-set-server=utf8mb4
init_connect='SET NAMES utf8mb4'
collation-server=utf8mb4_unicode_ci
character-set-client-handshake=FALSE

symbolic-links=0
log-error=/var/log/mysqld.log
socket=/var/lib/mysql/mysql.sock
pid-file=/var/run/mysqld/mysqld.pid

secure_file_priv=/var/lib/mysql-files
sql-mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

ESC
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  9. 创建数据文件目录、所属组、用户改为mysql

    mkdir /data
mkdir /data/mysql
chown -R mysql:mysql /etc/my.cnf
chown -R mysql:mysql /data/mysql/
chown -R mysql:mysql /var/*/mysql*

  10. 修改SELinux

    vim /etc/sysconfig/selinux

SELINUX=permissive

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setenforce 0

  11. 启动数据库(2台服务器均执行)

    systemctl enable mysqld
systemctl start mysqld
cat /var/log/mysqld.log|grep password
# 结果显示
A temporary password is generated for root@localhost: **************

  12. 修改数据库初始密码(2台服务器均执行)

    mysql -u root -p
# 输入原始密码
**************
# 设置允许使用弱密码
SET GLOBAL validate_password_policy=0;
ALTER USER 'root'@'localhost' IDENTIFIED BY '**************';
GRANT ALL PRIVILEGES ON *.* TO 'mysql'@'192.168.%' IDENTIFIED BY '**************' WITH GRANT OPTION;
FLUSH PRIVILEGES;
QUIT;

  13. 初始化数据库(2台服务器均执行)

    # 如果是数据库【安装】则只执行下面这步(除了密码一律选择Y)
mysql_secure_installation

# 如果是数据库【升级】则只执行下面这步(**************表示数据库之前的密码)
mysql_upgrade -u root -p
**************

  14. 修改集群相关配置

    vim /etc/my.cnf

# 192.168.0.11
server-id=1
binlog-format=Row
log-bin=/data/mysql/mysql-bin
relay-log=localhost1-relay-bin

# 192.168.0.12
server-id=2
binlog-format=Row
log-bin=/data/mysql/mysql-bin
relay-log=localhost2-relay-bin

ESC
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# 重启各服务器MySQL!重启各服务器MySQL!!重启各服务器MySQL!!!

  15. 配置防火墙(2台服务器均执行)

    yum install firewalld -y
systemctl enable firewalld
systemctl start  firewalld
firewall-cmd --permanent --zone=public --add-port=3306/tcp
firewall-cmd --reload

  16. 创建服务器数据同步账号密码

    mysql -u root -p
**************
SET GLOBAL validate_password_policy=0;
GRANT REPLICATION SLAVE ON *.* TO 'mysql'@'192.168.%' IDENTIFIED BY '**************';
FLUSH PRIVILEGES;

  17. 从服务器中指定二进制文件路径

    # 这里如果是n台服务器，则1为2的MASTER，2为3的MASTER，(...)，n为1的MASTER。
# 因为这里n=2，所以1为2的MASTER，2为1的MASTER
# 192.168.0.11执行
mysql -u root -p
**************
CHANGE MASTER TO
MASTER_HOST='192.168.0.12',
MASTER_USER='mysql',
MASTER_PASSWORD='**************',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=600;

# 192.168.0.12
mysql -u root -p
**************
CHANGE MASTER TO
MASTER_HOST='192.168.0.11',
MASTER_USER='mysql',
MASTER_PASSWORD='**************',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=600;

# 重启各服务器MySQL!重启各服务器MySQL!!重启各服务器MySQL!!!

SHOW SLAVE STATUS\G

# Slave_IO_Running:  Yes
# Slave_SQL_Running: Yes
# 表示配置成功！！！
# 如果没成功，检查防火墙3306端口是否打开

  18. 解决Slave_IO_Running: No

    # 显示相应服务器MASTER状态
SHOW MASTER STATUS;
# 修改MASTER状态配置
CHANGE MASTER TO Master_Log_File = 'mysql-bin.000002', Master_Log_Pos = 154;

# 重启各服务器MySQL!重启各服务器MySQL!!重启各服务器MySQL!!!
  19. 分别在任意一台数据库服务器操作数据，看另一台是否发生了变化，如果发生相同变化，则数据库服务器集群搭建成功

MySQL官方不推荐mysql-proxy，以下内容仅供参考

  1. 假设mysql-proxy服务器为192.168.0.13，则在该服务器执行如下操作

    cd ~
wget https://cdn.mysql.com/archives/mysql-proxy/mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz
tar -zxvf mysql-proxy-0.8.5-linux-el6-x86-64bit.tar.gz
mv mysql-proxy-0.8.5-linux-el6-x86-64bit /usr/local/mysql-proxy
vim /etc/profile
export PATH=$PATH:/usr/local/mysql-proxy/bin
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source /etc/profile

  2. 配置防火墙(mysql-proxy服务器执行)

    systemctl enable firewalld
systemctl start  firewalld
firewall-cmd --permanent --zone=public --add-port=4040/tcp
firewall-cmd --permanent --zone=public --add-port=4041/tcp
firewall-cmd --reload

  3. 编写lua脚本

    vim /usr/local/mysql-proxy/mysql-proxy.lua

if not proxy.global.config.rwsplit then
    proxy.global.config.rwsplit={
        min_idle_connections=1,
        max_idle_connections=1,
        is_debug=false
    }
end

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  4. 编写mysql-proxy脚本

    vim /usr/local/mysql-proxy/mysql-proxy.sh

#!/bin/bash
/usr/local/mysql-proxy/bin/mysql-proxy \
--proxy-address=192.168.0.13:4040 \
--proxy-backend-addresses=192.168.0.11:3306 \
--proxy-backend-addresses=192.168.0.12:3306 \
--log-level=info \
--proxy-lua-script=/usr/local/mysql-proxy/mysql-proxy.lua \
--log-file=/var/lib/mysql/mysql-proxy.log \
--daemon

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chmod u+x /usr/local/mysql-proxy/mysql-proxy.sh
/usr/local/mysql-proxy/mysql-proxy.sh

  5. 查看运行情况

    ps aux | grep mysql-proxy

  6. 测试读写分离(每台服务器都执行)

    SET GLOBAL general_log_file='/tmp/mysql.log';
SET GLOBAL general_log=ON;
tail -f /tmp/mysql.log
SET GLOBAL general_log=OFF;
  7. 领支付宝红包支持作者

    CentOS7.X搭建MySQL集群(互为主从)

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