mysql8 MHA集群部署

服务器环境

系统	主机名	IP
centos7.9	mha-master	192.168.200.41、192.168.200.45（vip）
centos7.9	mha-slave01	192.168.200.42
centos7.9	mha-slave02	192.168.200.43
centos7.9	mha-monitor	192.168.200.40

SSH互信

mha-master、mha-slave01、mha-slave02、mha-monitor四台机器之间设置免密互信

mysql安装

1. mha-master、mha-slave01、mha-slave02安装mysql8

   tar zxvf mysql-8.0.19-1.el7.x86_64.rpm-bundle.tar.gz
   
   rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64
   
   rpm -ivh mysql-community-common-8.0.19-1.el7.x86_64.rpm --nodeps --force
   rpm -ivh mysql-community-libs-8.0.19-1.el7.x86_64.rpm --nodeps --force
   rpm -ivh mysql-community-client-8.0.19-1.el7.x86_64.rpm --nodeps --force
   rpm -ivh mysql-community-server-8.0.19-1.el7.x86_64.rpm --nodeps --force
   # yum 安装perl-DBD-MySQL依赖
   rpm -ivh mysql-community-libs-compat-8.0.19-1.el7.x86_64.rpm --nodeps --force
   
   

   mkdir -p /data/mysql/data /data/mysql/mysql-files /data/mysql/mysql-keyring
   chown -R mysql:mysql /data/mysql
   rm -rf /var/lib/mysql
   rm -rf /var/lib/mysql-files
   rm -rf /var/lib/mysql-keyring
   ln -s /data/mysql/data /var/lib/mysql
   ln -s /data/mysql/mysql-files /var/lib/mysql-files
   ln -s /data/mysql/mysql-keyring /var/lib/mysql-keyring
   

2. 修改my.cnf

   [mysqld]
   port=3308
   default-time-zone='+08:00' 
   server-id=41 # server的唯一标识
   log-bin=mysql-bin
   binlog_format=row
   
   binlog-ignore-db=mysql #要忽略的数据库
   binlog-ignore-db=information_schema
   binlog-ignore-db=performance_schema
   binlog-ignore-db=sys
   
   replicate_ignore_db=mysql
   replicate_ignore_db=information_schema
   replicate_ignore_db=performance_schema
   replicate_ignore_db=sys
   
   log-slave-updates=1 # 允许从服务器将复制时间写入binglog日志
   skip-name-resolve # 禁用DNS解析，加快IP方式的连接
   
   auto-increment-increment=1
   auto-increment-offset=1
   
   gtid-mode=on # 开启gtid模式
   enforce-gtid-consistency=1 # 开启gtid安全限制
   report_host=192.168.200.41 # 报告主机监控地址
   
   default-authentication-plugin=mysql_native_password
   
   datadir=/var/lib/mysql
   socket=/var/lib/mysql/mysql.sock
   pid-file=/var/run/mysqld/mysqld.pid
   
   log-error=/var/lib/mysql/mysqld.log
   slow_query_log = 1
   long_query_time = 2
   slow_query_log_file = /var/lib/mysql/mysql-slow.log
   
   
   character-set-client-handshake = FALSE
   character-set-server = utf8mb4
   collation-server = utf8mb4_general_ci
   init_connect='SET NAMES utf8mb4'
   
   max_connections = 1024
   max_connect_errors = 6000
   open_files_limit = 65535
   table_open_cache = 128
   max_allowed_packet = 200M
   binlog_cache_size = 1M
   max_heap_table_size = 8M
   tmp_table_size = 16M
   read_buffer_size = 2M
   read_rnd_buffer_size = 8M
   sort_buffer_size = 8M
   join_buffer_size = 8M
   thread_cache_size = 64
   key_buffer_size = 4M
   ft_min_word_len = 4
   transaction_isolation = REPEATABLE-READ
   
   performance_schema = 0
   explicit_defaults_for_timestamp=true
   lower_case_table_names=1
   skip-external-locking 
   default-storage-engine = InnoDB 
   innodb_file_per_table = 1
   
   innodb_open_files = 500
   
   innodb_buffer_pool_size = 6G
   innodb_buffer_pool_chunk_size = 128M
   innodb_buffer_pool_instances = 16
   
   innodb_write_io_threads = 4
   innodb_read_io_threads = 4
   innodb_thread_concurrency = 0
   innodb_purge_threads = 1
   innodb_flush_log_at_trx_commit = 2
   innodb_log_buffer_size = 2M
   innodb_log_file_size = 32M
   innodb_log_files_in_group = 3
   innodb_max_dirty_pages_pct = 90
   innodb_lock_wait_timeout = 120 
   bulk_insert_buffer_size = 8M
   myisam_sort_buffer_size = 8M
   myisam_max_sort_file_size = 10G
   myisam_repair_threads = 1
   interactive_timeout = 7200
   wait_timeout = 86400
   
   [client]
   default-character-set = utf8mb4
   [mysql]
   socket=/var/lib/mysql/mysql.sock
   default-character-set = utf8mb4
   

3. mha-master、mha-slave01、mha-slave02启动mysql服务并修改root密码

   # 修改mysql的root账号初始权限
   alter user 'root'@'localhost' identified with mysql_native_password by "p2+EH+zA|#qOSdn^fNT8";
   flush privileges;
   

4. mha-master创建MHA账号和主从同步账号repl

   # 创建主从同步账号repl,并授权
   create user 'repl'@'192.168.200.%' identified with mysql_native_password by 'Test0102@.';
   
   GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.200.%';
   

   # 创建MHA账号并授权
   create user 'mha'@'192.168.200.%' identified with mysql_native_password by 'Test0102@.';
   
   grant all privileges on *.* to 'mha'@'192.168.200.%';
   
   flush privileges;
   

5. mha-slave01、mha-slave02从库设置

   change master to master_host='192.168.200.41',master_port=3308,master_user='repl',master_password='Test0102@.',master_auto_position=1;
   

MHA 安装部署

1. 所有节点安装MHA Node

   
   # 依赖安装
   yum -y install perl-DBD-MySQL perl-ExtUtils-MakeMaker perl-CPAN
   
   # 软件下载地址
   https://github.com/yoshinorim/mha4mysql-node/releases/download/v0.58/mha4mysql-node-0.58.tar.gz
   
   # 源码编译安装
   tar -zxf mha4mysql-node-0.58.tar.gz
   cd mha4mysql-node-0.58/
   
   perl Makefile.PL
   make
   sudo make install
   
   # 查看安装成功后的脚本文件
   ll /usr/local/bin/
   
   

2. mha-monitor节点安装MHA Manager

   # 安装依赖（需要epel的yum源，否则perl-Log-Dispatch，perl-Parallel-ForkManager这2个包安装不了）
   yum -y install perl-DBD-MySQL perl-ExtUtils-MakeMaker perl-CPAN perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager
   
   # 软件下载地址
   https://github.com/yoshinorim/mha4mysql-manager/releases/download/v0.58/mha4mysql-manager-0.58.tar.gz
   
   # 源码编译安装
   tar -zxf mha4mysql-manager-0.58.tar.gz
   cd mha4mysql-manager-0.58/
   perl Makefile.PL
   make
   sudo make install
   
   # 拷贝脚本文件至/usr/local/bin/
   cp samples/scripts/master_ip_failover /usr/local/bin/
   cp samples/scripts/master_ip_online_change /usr/local/bin/
   
   # 查看安装成功后的脚本文件
   ll /usr/local/bin/
   

   # 配置 MHA Manager
   mkdir /etc/mha
   mkdir /usr/local/mha
   mkdir -p /var/log/masterha/app1
   
   cat > /etc/mha/mha.cnf << EOF
   
   [server default]
   manager_workdir=/var/log/masterha/app1
   manager_log=/var/log/masterha/app1/app1.log
   master_ip_failover_script=/usr/local/bin/master_ip_failover
   master_ip_online_change_script=/usr/local/bin/master_ip_online_change
   ping_interval=1
   secondary_check_script=/usr/local/bin/masterha_secondary_check -s 192.168.200.42 -s 192.168.200.43
   ssh_user=root
   user=mha
   password=Test0102@.
   repl_user=repl
   repl_password=Test0102@.
   
   [server1]
   hostname=192.168.200.41
   port=3308
   
   [server2]
   hostname=192.168.200.42
   port=3308
   candidate_master=1
   
   
   [server3]
   hostname=192.168.200.43
   port=3308
   
   EOF
   

   # 修改手动vip切换脚本
   cat > /usr/local/bin/master_ip_failover << EOF
   #!/usr/bin/env perl
   
   use strict;
   use warnings FATAL => 'all';
   
   use Getopt::Long;
   use MHA::DBHelper;
   
   my (
     $command,        $ssh_user,         $orig_master_host,
     $orig_master_ip, $orig_master_port, $new_master_host,
     $new_master_ip,  $new_master_port,  $new_master_user,
     $new_master_password
   );
   
   ##############该部分按实际修改
   my $vip = '192.168.200.45/24';
   my $ifdev = 'ens33';
   my $key = '1';
   my $ssh_start_vip = "/sbin/ifconfig $ifdev:$key $vip";
   my $ssh_stop_vip = "/sbin/ifconfig $ifdev:$key  down";
   
   ##############
   
   GetOptions(
     'command=s'             => \$command,
     'ssh_user=s'            => \$ssh_user,
     'orig_master_host=s'    => \$orig_master_host,
     'orig_master_ip=s'      => \$orig_master_ip,
     'orig_master_port=i'    => \$orig_master_port,
     'new_master_host=s'     => \$new_master_host,
     'new_master_ip=s'       => \$new_master_ip,
     'new_master_port=i'     => \$new_master_port,
     'new_master_user=s'     => \$new_master_user,
     'new_master_password=s' => \$new_master_password,
   );
   
   exit &main();
   
   sub main {
     print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
     if ( $command eq "stop" || $command eq "stopssh" ) {
   
       my $exit_code = 1;
       eval {
   
         print "Disabling the VIP on old master: $orig_master_host \n";
         &stop_vip();
         # updating global catalog, etc
         $exit_code = 0;
       };
       if ($@) {
         warn "Got Error: $@\n";
         exit $exit_code;
       }
       exit $exit_code;
     }
     elsif ( $command eq "start" ) {
   
       my $exit_code = 10;
       eval {
   
         print "Enabling the VIP - $vip on the new master - $new_master_host \n";
         &start_vip();
         $exit_code = 0;
       };
       if ($@) {
         warn $@;
   
         # If you want to continue failover, exit 10.
         exit $exit_code;
       }
       exit $exit_code;
     }
     elsif ( $command eq "status" ) {
   
       print "Checking the Status of the script.. OK \n";
       # do nothing
       exit 0;
     }
     else {
       &usage();
       exit 1;
     }
   }
   sub start_vip() {
   
       `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
   
   }
   
   sub stop_vip() {
   
        return 0  unless  ($ssh_user);
   
       `ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
   
   }
   
   
   sub usage {
     print
   "Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
   }
   
   EOF
   

   # 手动测试切换VIP/usr/local/bin/master_ip_failover
   
   停
   /usr/local/bin/master_ip_failover --command=stop --ssh_user=root --orig_master_host=192.168.200.42 --orig_master_ip=192.168.200.42 --orig_master_port=3308 --new_master_host=192.168.200.41 --new_master_ip=192.168.200.41 --new_master_port=3308
   
   启
   /usr/local/bin/master_ip_failover --command=start --ssh_user=root --orig_master_host=192.168.200.41 --orig_master_ip=192.168.200.41 --orig_master_port=3308 --new_master_host=192.168.200.42 --new_master_ip=192.168.200.42 --new_master_port=3308
   
   # 自动切换脚本/usr/local/bin/master_ip_online_change
   
   # MHA 检测ssh状态
   masterha_check_ssh --conf=/etc/mha/mha.cnf
   
   # MHA 检测mysql集群主从状态
   masterha_check_repl --conf=/etc/mha/mha.cnf
   
   # MHA Manager启动
   nohup masterha_manager --conf=/etc/mha/mha.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/app1.log 2>&1 &
   
   # MHA Manager关闭
   masterha_stop --conf=/etc/mha/mha.cnf