MYSQL实战-MHA搭建及问题总结

##################MHA部署####################
1.服务器
 192.168.56.21 mydb1   #Master
 192.168.56.22 mydb2   #Slave
 192.168.56.23 mydb3   #MHA manager

2. 所有机器修改vim /etc/hosts
192.168.56.21   mydb1
192.168.56.22   mydb2
192.168.56.23   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 192.168.56.22:/root/
   scp -r .ssh 192.168.56.23:/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）
 yum -y install perl-CPAN 下载perl需要的依赖包库
 perl -MCPAN -e "install inc::Module::Install 在依赖包库中，查找和安装Makefile.PL需要的包，具体程序是 use inc::Module::Install;
 参考https://perlmaven.com/cant-locate-inc-module-install-in-inc
 上面实际下载的是Module-Install-1.18.tar.gz 这个包
 //perl -MCPAN -e shell
 //perl -MCPAN -e "install Module::Depends"
 参考 http://cache.baiducontent.com/c?m=9f65cb4a8c8507ed4fece7631046893b4c4380147d8c8c4668d4e419ce3b4c413037bfa6663f405a8e906b6075ab4f5bbdf06270670123b598c8d40895ac925f75ce786a6459db0144dc42f39a5125b07fcd0caef14ef0ba8169cfef9480810a44cb23127af7e78a2a424bdd6f814f6df4a6e85f135d07bb9d6b39ae&p=8b2a971cc89401ff57ee967c525285&newp=80769a478a8702c308e2977c0f43cc231610db2151d7d0106b82c825d7331b001c3bbfb423241a05d8ce7c6d04aa4b5feaf4357534072ba3dda5c91d9fb4c57479d463771c&user=baidu&fm=sc&query=inc/Module/Install%2Epm+in+%40INC&qid=e9eec041000013a8&p1=10
 
  tar xzvf mha4mysql-node-0.56.tar.gz
  cd mha4mysql-node-0.56
  perl Makefile.PL
  注意 在安装perl install模块后，这里终于可以正常执行了，在执行PL后，系统会验证哪些包missing，这时就可以根据他的提示安装少的包了
 
  make && make install

 
  
 7.在管理节点安装manager
 
   //可以先查看本机已安的包名
  
   rpm -qa perl-Config-Tiny perl-Params-Validate perl-MIME-Types perl-Email-Date-Format perl-Mail-Sender perl-Mail-Sendmail perl-TimeDate perl-MailTools perl-MIME-Lite perl-Log-Dispatch perl-Parallel-ForkManager
   共11个包
   rpm -qa perl-Config-Tiny perl-Params-Validate perl-MIME-Types perl-Email-Date-Format perl-Mail-Sender perl-Mail-Sendmail perl-TimeDate perl-MailTools perl-MIME-Lite perl-Log-Dispatch perl-Parallel-ForkManager | xargs rpm -ivh
   上面命令直接安装
  
   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
   如果上面包都没有，直接从yum源下载并安装
   yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes -y
   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

 8 配置主从同步GTID方式
 这里用的是init.sh脚本，能自动搭建主从GTID服务器，且在一台机器上。当机器上没有mysql用户时，此脚本有些问题，在脚本初始化后要
 做的修改是
  show grants for 'rpl_user@127.0.0.1';
  主库上建立repl用户
  grant replication slave on *.* to rpl_user@% identified by '1234';
  从库上去掉多余的rpl_user,注意要先去掉权限才能删除这个用户
  revoke replication slave on *.*  from rpl_user@127.0.0.1
  revoke replication slave on *.*  from 'rpl_user'@'%';
  drop user 'rpl_user'@'%';
   
 9修改root用户默认密码
 安装mysql开始 root用户没有密码，怕影响mha，所以建立root用户密码
 use mysql;
 mysql>  (老版本)update user set password=password("123456") where user="root";
（5.7.11）update user set authentication_string=password("123456") where user="root";
 flush privileges;
 
 ln -s /usr/local/mysql_5.7/bin/mysql /usr/bin //软链接调用mysql命令

####################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

masterha_check_ssh --conf=/u01/mha/etc/app.cnf //监控ssh是否正常
masterha_check_repl --conf=/u01/mha/etc/app.cnf //监控主从复制是否正常
MHA masterha_check_repl 检测过程
###################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 56.201 -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='192.168.56.21',
        MASTER_PORT=3306,
        MASTER_LOG_FILE='mysql-bin.000005',
        MASTER_LOG_POS=120,
        MASTER_USER='rep',
        MASTER_PASSWORD='rep123';

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192.168.56.21）
set global event_scheduler=off;

2.manager：关闭管理进程 （即192.168.56.23）
/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='192.168.56.22',
        MASTER_PORT=3306,
        MASTER_LOG_FILE='binlog.000021',
        MASTER_LOG_POS=299,
        MASTER_USER='rep',
        MASTER_PASSWORD='rep123';

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
 

https://www.cnblogs.com/zhoujinyi/p/3808673.html

#################配置文件###################
vim /u01/mha/etc/app.cnf

[server default]
user = root
password = 123456
ssh_user = root
repl_user = rpl_user
repl_password = rpl_pass
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/mysql_5.7/s1/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=iZ2zehy7gff0kpg1swp1czZ
port=33091
master_binlog_dir="/apps/dbdat/mysql5_data33091/log"
candidate_master=1
ignore_fail=1

[server2]
hostname=iZ2zehy7gff0kpg1swp1czZ
port=33092
master_binlog_dir="/u01/mysql_5.7/s2/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 = '192.168.56.201/24';  # 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 -s192.168.56.201 -I $int 192.168.56.1 -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";
}