MySQL MHA部署实战

MySQL MHA部署

环境：CentOS7

master 192.168.1.4

slave1 192.168.1.5

slave2 192.168.1.2

mha 192.168.1.7

• 安装依赖

yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker perl-CPAN

安装epel yum源
yum install epel-release

• 查找centos默认的mariadb

  rpm -qa|grep mariadb

• 移除centos默认的mariadb

  rpm -e mariadb-libs-5.5.41-2.el7_0.x86_64 --nodeps

• 解压mysql

  tar xvf mysql-5.7.28-1.el7.x86_64.rpm-bundle.tar

• 依次安装

  rpm -ivh mysql-community-common-5.7.28-1.el7.x86_64.rpm
  rpm -ivh mysql-community-libs-5.7.28-1.el7.x86_64.rpm
  rpm -ivh mysql-community-libs-compat-5.7.28-1.el7.x86_64.rpm
  rpm -ivh mysql-community-client-5.7.28-1.el7.x86_64.rpm 
  rpm -ivh mysql-community-server-5.7.28-1.el7.x86_64.rpm 
  rpm -ivh mysql-community-devel-5.7.28-1.el7.x86_64.rpm
  

• 初始化mysql，初始化一个用户

  mysqld --initialize --user=mysql

• 查看初始密码

  cat /var/log/mysqld.log

  9jwYrpb&3H>w

• 设置系统默认启动mysql服务

  systemctl start mysqld.service

• 设置新密码

  set password=password('root');

• 关闭防火墙，禁止自动启动

  systemctl stop iptables
  systemctl stop firewalld
  systemctl disable firewalld.service
  

• 编辑主库和从库配置文件/etc/my.cnf

server-id=1|2|3
log_bin=mysql-bin
relay_log=mysql-relay-bin
sync-binlog=1
binlog-ignore-db=performance_schema
binlog-ignore-db=information_schema
binlog-ignore-db=sys

• 重启mysql服务

  systemctl restart mysqld

• 授权并刷新

  grant replication slave on *.* to 'root'@'%' identified by 'root';
  grant all privileges on *.* to 'root'@'%' identified by 'root';
  flush privileges;
  

• 开启同步

  主库

  show master status;
  记录log和位置
  mysql-bin.000003	154
  

  从库设置主库：

  change master to master_host='192.168.1.4',master_port=3306,master_user='root',master_password='root',master_log_file='mysql-bin.000003',master_log_pos=154;
  

• 由于从库的虚拟机是克隆出来的，因此从库的/var/lib/mysql/auto.cnf中的server-uuid是和主库相同的，会提示

  Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work

  因此需要停止服务，删除该文件，重启服务。

  systemctl stop mysqld.service
  mv /var/lib/mysql/auto.cnf /var/lib/mysql/auto.cnf.bak
  systemctl start mysqld.service
  

• 开启/关闭同步

  start slave;

  stop slave;

安装mha

• 在4个节点安装node

  rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch.rpm

• 更新yum

  yum -y update

• 在manager节点安装依赖

  yum install -y perl-Log-Dispatch

  yum install -y perl-Parallel-ForkManager

  这里安装失败，yum源中没有相关包，且安装最新epel后也没有包，只能手动从网站下载包安装

  http://www.rpmfind.net/linux/rpm2html/search.php?query=perl-mail-send&submit=Search+…&system=&arch=

  依次下载安装

  perl-Email-Date-Format-1.002-15.el7.noarch.rpm

  perl-MIME-Types-1.38-2.el7.noarch.rpm

  perl-MIME-Lite-3.030-1.el7.noarch.rpm

  perl-Mail-Sendmail-0.79-21.el7.noarch.rpm

  perl-Mail-Sender-0.8.23-1.el7.noarch.rpm

  perl-Log-Dispatch-2.41-1.el7.1.noarch.rpm

  perl-Parallel-ForkManager-1.18-2.el7.noarch.rpm

  以上包， 页面Ctrl+F搜索el7 ，选择x86_64即可找到。

• 在manager节点安装mha manager

  rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm

• 配置ssh免密

  提示输入直接回车即可。

  #master  192.168.1.4下执行
  
  ssh-keygen -t rsa
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  
  #slave1   192.168.1.5下执行
  ssh-keygen -t rsa
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  
  #slave2   192.168.1.2下执行
  ssh-keygen -t rsa
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  
  #mha      192.168.1.7下执行
  ssh-keygen -t rsa
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
  

• 配置mha配置文件

  mkdir /etc/masterha 
  mkdir /etc/masterha/app1 
  cd /etc/masterha/ 
  vim app.cnf
  

  [server default]
  manager_log=/etc/masterha/mha.log
  manager_workdir=/etc/masterha/
  
  manager_log=/var/log/masterha/app1/manager.log
  master_binlog_dir=/var/lib/mysql
  #master_ip_online_change_script=/etc/masterha/master_ip_online_change
  # master_ip_online_change_script=/usr/local/bin/master_ip_online_change
  ping_interval=1
  remote_workdir=/tmp
  
  repl_user=root
  repl_password=root
  ssh_user=root
  user=root
  password=root
   
  [server1]
  hostname=192.168.1.4
  port=3306
   
  [server2]
  hostname=192.168.1.5
  port=3306
  check_repl_delay=0
   
  [server3]
  hostname=192.168.1.2
  port=3306
  

• 测试ssh连通

  masterha_check_ssh --conf=/etc/masterha/app.cnf

  此时提示MHA/NodeConst.pm did not return a true value at /usr/share/perl5/vendor_perl/MHA/ManagerConst.pm line 25.

  检查NodeConst.pm文件，发现内容为空，于是卸载manager，卸载node，重新安装node，重新安装manager则正常连接。

​ 校验时提示

[error][/usr/share/perl5/vendor_perl/MHA/ManagerUtil.pm, ln122] Got error when getting node version. Error:node version on 192.168.1.5 not found! Is MHA Node package installed

​ 这里是没有安装好mhanode，检查/usr/share/perl5/vendor_perl/MHA/ManagerUtil.pm文件发现是空的。

​ 卸载后重新安装，发现有提示有缺少的需求 libmysqlclient.so.18()，但是之前安装node的时候被我忽略了，这个是上面mysql的mysql-community-libs-compat-5.7.28-1.el7.x86_64安装掉了

​ 卸载noderpm -e mha4mysql-node-0.58-0.el7.centos.noarch

​ 安装libs-compat

​ rpm -ivh mysql-community-libs-compat-5.7.28-1.el7.x86_64.rpm

​ 安装node

​ yum install mha4mysql-node-0.58-0.el7.centos.noarch.rpm

• 校验server状态

  masterha_check_repl --conf=/etc/masterha/app.cnf

• 启动

  nohup masterha_manager --conf=/etc/masterha/app.cnf --remove_dead_master_conf --ignore_last_failover /tmp/mha_manager.log 2>&1 &

• 检测是否启动

  masterha_check_status --conf=/etc/masterha/app.cnf

  这里发现启动失败，检查/tmp/mha_manager.log，发现提示Cannot write to ‘/var/log/masterha/app1/manager.log’: 没有那个文件或目录 at /usr/share/perl5/vendor_perl/Log/Dispatch/File.pm

  这里的目录是在app.cnf中配置的，创建该目录即可

  mkdir -p /var/log/masterha/app1/

测试

启动成功后
systemctl stop mysqld
systemctl start mysqld

重新启动后根据日志/var/log/masterha/app1/manager.log中记录的logbin位置，配置到master，再start slave;即可作为从服务器同步到master

change master to master_host=‘192.168.1.4’,master_port=3306,master_user=‘root’,master_password=‘root’,master_log_file=‘mysql-bin.000005’,master_log_pos=154;

参考

安装https://blog.csdn.net/ko0491/article/details/108572596

官方文档https://github.com/yoshinorim/mha4mysql-manager/wiki/Installation#installing-mha-node

宕机恢复https://blog.csdn.net/qq_34457768/article/details/79554586