MHA安装和部署步骤

来源：这里教程网时间：2026-03-01 11:49:45 作者：

##################MHA安装和部署#################### 1.服务器 192.168.0.21 mydb1 #Master 192.168.0.22 mydb2 #Slave 192.168.0.23 mydb3 #MHA manager 2. 所有机器修改vim /etc/hosts 192.168.0.21 mydb1 192.168.0.22 mydb2 192.168.0.23 mydb3 3.设置SSH公钥免密码登录 #root用户操作(/root),pwd mkdir ~/.ssh chmod 700 ~/.ssh cd ~/.ssh ssh-keygen -t rsa #一直回车 ls -al cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys ls -al chmod 600 ~/.ssh/authorized_keys cd .. scp -r .ssh 192.168.0.22:/root/ scp -r .ssh 192.168.0.23:/root/ ssh mydb1 ssh mydb2 ssh mydb3 4.下载mha4mysql-manager和mha4mysql-node https://github.com/yoshinorim/mha4mysql-manager https://github.com/yoshinorim/mha4mysql-node 5.在三个节点（node 和 manager）安装perl-DBD-MySQL，用光盘作yum源，#包括了3个包：Perl-DBD-MySQL,mysql-libs,perl-DBI yum install perl-DBD-MySQL yum install perl-DBI yum install mysql-libs 6.在三个节点安装node（包括管理节点） tar xzvf mha4mysql-node-0.56.tar.gz cd mha4mysql-node-0.56 perl Makefile.PL make && make install 7.在管理节点安装manager rpm -ivh perl-Config-Tiny-2.12-1.el5.rf.noarch.rpm rpm -ivh perl-Params-Validate-0.95-1.el5.rf.i386.rpm rpm -ivh perl-MIME-Types-1.28-2.el6.noarch.rpm rpm -ivh perl-Email-Date-Format-1.002-5.el6.noarch.rpm rpm -ivh perl-Mail-Sender-0.8.16-3.el6.noarch.rpm rpm -ivh perl-Mail-Sendmail-0.79-12.el6.noarch.rpm rpm -ivh perl-TimeDate-1.16-11.1.el6.noarch.rpm rpm -ivh perl-MailTools-2.04-4.el6.noarch.rpm rpm -ivh perl-MIME-Lite-3.027-2.el6.noarch.rpm rpm -ivh perl-Log-Dispatch-2.26-1.el5.rf.noarch.rpm rpm -ivh perl-Parallel-ForkManager-0.7.5-2.2.el5.rf.noarch.rpm yum install perl-Time-HiRes #光盘yum源 tar xzvf mha4mysql-manager-0.56.tar.gz cd mha4mysql-manager-0.56 perl Makefile.PL make && make install ####################常用命令############### /usr/local/bin/masterha_check_ssh --conf=/u01/mha/etc/app.cnf /usr/local/bin/masterha_check_repl --conf=/u01/mha/etc/app.cnf /usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf & /u01/mha/etc/masterha_check_status --conf=/u01/mha/etc/app.cnf /usr/local/bin/masterha_stop --conf=/u01/mha/etc/app.cnf ###################切换###################### 一、failover故障切换 1.模拟主库宕机 [root@mydb3~]# ssh mydb1 "killall -r mysqld" 2.查看管理节点日志，可以看到VIP已经漂移 [root@mydb3 ~]# cat /u01/mha/log/manager.log |grep -i vip 3. 验证VIP是否位于节点mydb2 [root@mydb3 ~]# ssh mydb2 "ifconfig |grep 0.201 -B1" 4. 查看管理节点MHA切换日志 [root@mydb3 ~]# tail /u01/mha/log/manager.log 5. new master(old slave) show master status\G 6. new slave(old:master) (1)打开MySQL mysqld_safe --defaults-file=/u01/my3306/my.cnf & (2)检查数据库 show master status\G show slave status\G (3)在管理节点日志中查主库的日志文件和位置 cat /u01/mha/etc/app/manager.log |grep -i change (4)在slave连接master CHANGE MASTER TO MASTER_HOST='192.168.0.21', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000005', MASTER_LOG_POS=120, MASTER_USER='repl', MASTER_PASSWORD='123456'; 7.启动管理节点 /usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf & /usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf --ignore_last_failover & 二、switchover线上切换 1.master：关闭event_scheduler（即192.168.0.21） set global event_scheduler=off; 2.manager：关闭管理进程（即192.168.0.23） /usr/local/bin/masterha_stop --conf=/u01/mha/etc/app.cnf 3.manager：检查配置文件 /u01/mha/etc/app.cnf 有没有被修改破坏。如果破坏需要重新编辑正确配置文件：/u01/mha/etc/app.cnf cp /u01/mha/etc/app.cnf.bak /u01/mha/etc/app.cnf 4.开始切换： /u01/mha/etc/masterha_master_switch --master_state=alive --conf=/u01/mha/etc/app.cnf 5.new master(old slave) mysql> show master status\G *************************** 1. row *************************** File: binlog.000021 Position: 299 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: 1 row in set (0.00 sec) 6.new slave(old master) CHANGE MASTER TO MASTER_HOST='192.168.0.22', MASTER_PORT=3306, MASTER_LOG_FILE='binlog.000021', MASTER_LOG_POS=299, MASTER_USER='repl', MASTER_PASSWORD='123456'; mysql> start slave; Query OK, 0 rows affected (0.01 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.56.12 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: binlog.000017 Read_Master_Log_Pos: 299 Relay_Log_File: relaylog.000002 Relay_Log_Pos: 280 Relay_Master_Log_File: binlog.000017 Slave_IO_Running: Yes Slave_SQL_Running: Yes 7.启动管理节点 /u01/mha/etc/masterha_manager --conf=/u01/mha/etc/app.cnf & /u01/mha/etc/masterha_manager --conf=/u01/mha/etc/app.cnf --remove_dead_master_conf --ignore_last_failover #################配置文件################### vim /u01/mha/etc/app.cnf [server default] user = root password = root123 ssh_user = root repl_user = rep repl_password = 123456 ping_interval = 1 ping_type = SELECT manager_workdir=/u01/mha/etc/app manager_log=/u01/mha/log/manager.log remote_workdir=/u01/mha/etc/app master_binlog_dir="/u01/my3306/log/binlog" master_ip_failover_script="/u01/mha/etc/master_ip_failover" master_ip_online_change_script="/u01/mha/etc/master_ip_failover" shutdown_script="" report_script="" #check_repl_delay=0 [server1] hostname=mydb1 port=3306 master_binlog_dir="/apps/dbdat/mysql5_data3306/log" candidate_master=1 ignore_fail=1 [server2] hostname=mydb2 port=3306 master_binlog_dir="/u01/my3306/log/binlog" candidate_master=1 ignore_fail=1 --------------------------------------------------------------------------------- vim /u01/mha/etc/master_ip_failover #!/usr/bin/env perl use strict; use warnings FATAL => 'all'; use Getopt::Long; my ( $command, $ssh_user, $orig_master_host, $orig_master_ip, $orig_master_port, $new_master_host, $new_master_ip, $new_master_port ); my $vip = '192.168.0.201/24'; # Virtual IP my $key = "1"; my $int = "eth0"; my $ssh_start_vip = "/sbin/ifconfig $int:$key $vip"; my $ssh_stop_vip = "/sbin/ifconfig $int:$key down"; my $arp_effect = "/sbin/arping -Uq -s192.168.0.201 -I $int 192.168.0.1 -c 3"; # Virtual IP and gat eway #my $test = "echo successfull >/tmp/test.txt"; $ssh_user = "root"; GetOptions( 'command=s' => \$command, 'ssh_user=s' => \$ssh_user, 'orig_master_host=s' => \$orig_master_host, 'orig_master_ip=s' => \$orig_master_ip, 'orig_master_port=i' => \$orig_master_port, 'new_master_host=s' => \$new_master_host, 'new_master_ip=s' => \$new_master_ip, 'new_master_port=i' => \$new_master_port, ); exit &main(); sub main { print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n"; if ( $command eq "stop" || $command eq "stopssh" ) { # $orig_master_host, $orig_master_ip, $orig_master_port are passed. # If you manage master ip address at global catalog database, # invalidate orig_master_ip here. my $exit_code = 1; eval { print "Disabling the VIP on old master: $orig_master_host \n"; &stop_vip(); $exit_code = 0; }; if ($@) { warn "Got Error: $@\n"; exit $exit_code; } exit $exit_code; } elsif ( $command eq "start" ) { # all arguments are passed. # If you manage master ip address at global catalog database, # activate new_master_ip here. # You can also grant write access (create user, set read_only=0, etc) here. 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 $@; exit $exit_code; } exit $exit_code; } elsif ( $command eq "status" ) { print "Checking the Status of the script.. OK \n"; #`ssh $ssh_user\@cluster1 \" $ssh_start_vip \"`; &status(); exit 0; } else { &usage(); exit 1; } } # A simple system call that enable the VIP on the new master sub start_vip() { `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`; `ssh $ssh_user\@$new_master_host \" $arp_effect \"`; # `ssh $ssh_user\@$new_master_host \" $test \"`; } # A simple system call that disable the VIP on the old_master sub stop_vip() { `ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`; } sub status() { print `ssh $ssh_user\@$orig_master_host \" ip add show $int \"`; } sub usage { print "Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_maste r_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n"; }

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MHA安装和部署步骤

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