MariaDB之MHA杂记

Posted 2020-10-27

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mysql复制及MHA

MHA

0、环境准备

master1:MHA Manager
master2:MariaDB master
master3:MariaDB slave
master4:MariaDB slave

各节点的/etc/hosts
10.201.106.131 master1 master1.com
10.201.106.132 master2 master2.com
10.201.106.133 master3 master3.com
10.201.106.134 master4 master4.com

1、配置主从

1.1 主节点配置

[[email protected] ~]# vim /etc/my.cnf

[mysqld]
datadir=/data/mysql
innodb_file_per_table = 1
skip_name_resolve = 1
log-bin = master-bin
relay-log = relay-bin
server_id = 1

[[email protected] ~]# systemctl start mariadb.service

创建一个拥有复制权限的账号：
MariaDB [(none)]> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO ‘repluser‘@‘10.201.106.%‘ IDENTIFIED BY ‘replpass‘;
MariaDB [(none)]> FLUSH PRIVILEGES;

查看二进制文件和位置
MariaDB [(none)]> SHOW MASTER STATUS;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-bin.000001 |      498 |              |                  |
                 |

1.2 从节点配置

从节点1配置：
[[email protected] ~]# vim /etc/my.cnf

[mysqld]
datadir=/var/lib/mysql
innodb_file_per_table = 1
skip_name_resolve = 1
log-bin = master-bin
relay-log = relay-bin
server_id = 2
read_only = 1
relay_log_purge = 0
[[email protected] ~]# systemctl restart mariadb.service

拷贝节点1配置到节点2：
[[email protected] ~]# scp /etc/my.cnf master4:/etc/
[email protected]‘s password: 
my.cnf                                                                100%  713     0.7KB/s   00:00    
[[email protected] ~]# 
节点2修改server_id
[[email protected] ~]# vim /etc/my.cnf

[mysqld]
server_id = 3
[[email protected] ~]# systemctl restart mariadb.service

1.3 从节点开启复制线程

[[email protected] mysql]# 
MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST=‘10.201.106.132‘,MASTER_USER=‘repluser‘,MASTER_PASSWORD=‘replpass‘,MASTER_LOG_FILE=‘master-bin.000001‘,MASTER_LOG_POS=245;

MariaDB [(none)]> START SLAVE;

查看状态：
MariaDB [(none)]> SHOW SLAVE STATUS\G

从节点2配置：
[[email protected] ~]# mysql

MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST=‘10.201.106.132‘,MASTER_USER=‘repluser‘,MASTER_PASSWORD=‘replpass‘,MASTER_LOG_FILE=‘master-bin.000001‘,MASTER_LOG_POS=245;

MariaDB [(none)]> START SLAVE;

2、主节点：创建一个可以远程连接拥有管理权限的账号

[[email protected] ~]# 
MariaDB [(none)]> GRANT ALL ON *.* TO ‘mhauser‘@‘10.201.106.%‘ IDENTIFIED BY ‘mhapass‘;

MariaDB [(none)]> FLUSH PRIVILEGES;

3、MHA 环境需要所有节点配置SSH密钥登录，互信通信

3.1 所有主机使用同一个私钥

创建覆盖密钥
[[email protected] ~]# ssh-keygen -t rsa -P ‘‘

将密钥内容覆盖到SSH密钥文件中
[[email protected] ~]# cat .ssh/id_rsa.pub > .ssh/authorized_keys

设置权限：
[[email protected] ~]# chmod 600 .ssh/authorized_keys 

复制文件到另外三个节点
[[email protected] ~]# scp -p .ssh/id_rsa .ssh/authorized_keys master2:/root/.ssh
id_rsa                                                                100% 1679     1.6KB/s   00:00    
authorized_keys                                                       100%  398     0.4KB/s   00:00    
[[email protected] ~]# scp -p .ssh/id_rsa .ssh/authorized_keys master3:/root/.ssh
id_rsa                                                                100% 1679     1.6KB/s   00:00    
authorized_keys                                                       100%  398     0.4KB/s   00:00    
[[email protected] ~]# scp -p .ssh/id_rsa .ssh/authorized_keys master4:/root/.ssh
id_rsa                                                                100% 1679     1.6KB/s   00:00    
authorized_keys                                                       100%  398     0.4KB/s   00:00    
[[email protected] ~]# 

测试：
[[email protected] ~]# ssh master2 ‘ifconfig ens33‘ | grep 13
        inet 10.201.106.132  netmask 255.255.255.0  broadcast 10.201.106.255
[[email protected] ~]# ssh master3 ‘ifconfig ens33‘ | grep 13
        inet 10.201.106.133  netmask 255.255.255.0  broadcast 10.201.106.255
[[email protected] ~]# ssh master4 ‘ifconfig ens33‘ | grep 13
        inet 10.201.106.134  netmask 255.255.255.0  broadcast 10.201.106.255

4、MHS Manger安装

4.1 Manger节点安装manger和node

[[email protected] ~]# yum -y install mha4mysql-*

[[email protected] ~]# scp mha4mysql-node-0.57-0.el7.noarch.rpm master2:/root
mha4mysql-node-0.57-0.el7.noarch.rpm                                  100%   35KB  34.5KB/s   00:00    
[[email protected] ~]# scp mha4mysql-node-0.57-0.el7.noarch.rpm master3:/root
mha4mysql-node-0.57-0.el7.noarch.rpm                                  100%   35KB  34.5KB/s   00:00    
[[email protected] ~]# scp mha4mysql-node-0.57-0.el7.noarch.rpm master4:/root
mha4mysql-node-0.57-0.el7.noarch.rpm                                  100%   35KB  34.5KB/s   00:00

5、另外三个节点安装mha-node

[[email protected] ~]# yum -y install mha4mysql-node-0.57-0.el7.noarch.rpm 
[[email protected] ~]# yum -y install mha4mysql-node-0.57-0.el7.noarch.rpm 
[[email protected] ~]# yum -y install mha4mysql-node-0.57-0.el7.noarch.rpm

6、配置manger

6.1 查看manger文件

[[email protected] ~]# rpm -ql mha4mysql-manager

查看node文件
[[email protected] ~]# rpm -ql mha4mysql-node

6.2 创建配置manger文件

[[email protected] ~]# mkdir /etc/masterha
[[email protected] ~]# vim /etc/masterha/app1.cnf

[server default]
user=mhauser
password=mhapass
manager_workdir=/data/masterha/app1
manager_log=/data/masterha/app1/manager.log
remote_workdir=/data/masterha/app1
ssh_user=root
repl_user=repluser
repl_password=replpass
ping_interval=1

[server1]
hostname=10.201.106.132
[server2]
hostname=10.201.106.133
candidate_master=1

[server3]
hostname=10.201.106.134

7、检查

7.1 SSH检查

[[email protected] ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf
Wed Jan 18 11:29:21 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Jan 18 11:29:21 2017 - [info] Reading application default configuration from /etc/mangerha/app1.cnf..
Wed Jan 18 11:29:21 2017 - [info] Reading server configuration from /etc/mangerha/app1.cnf..
Wed Jan 18 11:29:21 2017 - [info] Starting SSH connection tests..
Wed Jan 18 11:29:22 2017 - [debug] 
Wed Jan 18 11:29:21 2017 - [debug]  Connecting via SSH from [email protected](10.201.106.132:22) to [email protected](10.201.106.133:22)..
Wed Jan 18 11:29:21 2017 - [debug]   ok.
Wed Jan 18 11:29:21 2017 - [debug]  Connecting via SSH from [email protected](10.201.106.132:22) to [email protected](10.201.106.134:22)..
Wed Jan 18 11:29:22 2017 - [debug]   ok.
Wed Jan 18 11:29:23 2017 - [debug] 
Wed Jan 18 11:29:21 2017 - [debug]  Connecting via SSH from [email protected](10.201.106.133:22) to [email protected](10.201.106.132:22)..
Wed Jan 18 11:29:22 2017 - [debug]   ok.
Wed Jan 18 11:29:22 2017 - [debug]  Connecting via SSH from [email protected](10.201.106.133:22) to [email protected](10.201.106.134:22)..
Wed Jan 18 11:29:23 2017 - [debug]   ok.
Wed Jan 18 11:29:24 2017 - [debug] 
Wed Jan 18 11:29:22 2017 - [debug]  Connecting via SSH from [email protected](10.201.106.134:22) to [email protected](10.201.106.132:22)..
Wed Jan 18 11:29:23 2017 - [debug]   ok.
Wed Jan 18 11:29:23 2017 - [debug]  Connecting via SSH from [email protected](10.201.106.134:22) to [email protected](10.201.106.133:22)..
Wed Jan 18 11:29:24 2017 - [debug]   ok.
Wed Jan 18 11:29:24 2017 - [info] All SSH connection tests passed successfully.

7.2 检查主从复制环境

[[email protected] masterha]# masterha_check_repl --conf=/etc/masterha/app1.cnf

……
MySQL Replication Health is OK.

8、启动MHA服务

8.1 测试启动

[[email protected] masterha]# masterha_manager --conf=/etc/masterha/app1.cnf
Wed Jan 18 16:24:30 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Jan 18 16:24:30 2017 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Wed Jan 18 16:24:30 2017 - [info] Reading server configuration from /etc/masterha/app1.cnf..

8.2 切换测试

kill掉主mysql进程
[[email protected] mysql]# killall mysqld mysqld_safe

从节点2查看：
MariaDB [(none)]> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.201.106.133

从节点1的read_only已关掉：
MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘read_only‘;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| read_only     | OFF   |
+---------------+-------+

怎么加从节点：
1、先在主节点进行备份，记住新的日志文件名字和POS；
2、把备份二进制导入到从节点，让从节点从指定位置开始复制；
3、

8.3 将原来的主节点重新上线

[[email protected] ~]# vim /etc/my.cnf

[mysqld]

read_only = 1
relay_log_purge = 0

原来节点数据删除，重新做初始化。生产环境切勿操作：
[[email protected] ~]# rm -rf /var/lib/mysql/*

启动数据库：
[[email protected] ~]# systemctl start mariadb.service

从节点配置：
设置从头开始复制：
MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST=‘10.201.106.133‘,MASTER_USER=‘repluser‘,MASTER_PASSWORD=‘replpass‘;
MariaDB [(none)]> GRANT ALL ON *.* TO ‘mhauser‘@‘10.201.106.%‘ IDENTIFIED BY ‘mhapass‘;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO ‘repluser‘@‘10.201.106.%‘ IDENTIFIED BY ‘replpass‘;

开启从节点线程：
MariaDB [(none)]> START SLAVE;

8.4 检测

[[email protected] masterha]# masterha_check_repl --conf=/etc/masterha/app1.cnf

MySQL Replication Health is OK.

8.5 检测状态

[[email protected] masterha]# masterha_manager --conf=/etc/masterha/app1.cnf

[[email protected] ~]# masterha_check_status --conf=/etc/masterha/app1.cnf
app1 (pid:31234) is running(0:PING_OK), master:10.201.106.133

8.6 停止服务

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