mysql5.7.36采用yum部署MHA

準備作業

服務器之間需要做免密認證

#192.168.0.135上做免密認證
ssh-keygen
ssh-copy-id root@192.168.0.185
ssh-copy-id root@192.168.0.186
ssh-copy-id root@192.168.0.187

其他三臺主機都要做相同操作

Installing MHA NODE

yum -y install perl-DBD-MySQL   #安裝依賴包

下載地址：

https://code.google.com/archive/p/mysql-master-ha/downloadshttps://code.google.com/archive/p/mysql-master-ha/downloads下載包（本次使用）：mha4mysql-node-0.54-1.el5.noarch.rpm

#四臺服務器都要安裝
rpm -ivh mha4mysql-node-0.54-1.el5.noarch.rpm

Installing MHA Manager

部署服務器地址192.168.0.135

#安裝依賴包
yum install perl-DBD-MySQL
yum install perl-Config-Tiny
yum install perl-Log-Dispatch
yum install perl-Parallel-ForkManager

下載地址：

https://code.google.com/archive/p/mysql-master-ha/downloads

下載包（本次使用）：mha4mysql-manager-0.55-1.el5.noarch.rpm

#注意必須先安裝node，才能安裝manager
rpm -ivh mha4mysql-manager-0.55-1.el5.noarch.rpm

創建組態檔

vi /etc/mha/app1.conf

[server default]

password=password
user=mha

#日志目錄和檔案自己創建
manager_workdir=/var/log/masterha/app1

#vip腳本
master_ip_failover_script=/etc/mha/master_ip_failover
master_ip_online_change_script=""
ping_interval=1
remote_workdir=/var/log/masterha/app1
report_script=""
shutdown_script=""

ssh_port=22
ssh_user=root

#主從同步賬號
repl_password=password
repl_user=slave

[server1]
hostname=192.168.0.185

[server2]
hostname=192.168.0.186

[server3]
hostname=192.168.0.187

VIP配置方式

#必須手動先創建VIP
ssh 192.168.0.185 "/sbin/ifconfig ens192:0 192.168.0.128 netmask 255.255.255.0 up"

VIP腳本

vi /etc/mha/master_ip_failover

安裝網路修改IP地址和網卡名稱

#!/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 = '192.168.0.128/24';
my $key = '0';
my $ssh_start_vip = "/sbin/ifconfig ens192:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig ens192:$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,
);
 
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();
            $exit_code = 0;
        };
        if ($@) {
            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 $@;
            exit $exit_code;
        }
        exit $exit_code;
    }
    elsif ( $command eq "status" ) {
        print "Checking the Status of the script.. OK \n";
        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";
}

SSH互相檢測

masterha_check_ssh --conf=/etc/mha/app1.conf

主從狀態檢查

masterha_check_repl --conf=/etc/mha/app1.conf

檢查結果如下：

可能出現報錯，解決方式：

node 
ln -s /usr/lib/perl5/vendor_perl/MHA /usr/lib64/perl5/vendor_perl/

manager
vi /etc/profile
export PERL5LIB=$PERL5LIB:/usr/lib/perl5/vendor_perl/
source /etc/profile

正式啟動服務

#前臺運行
masterha_manager --conf=/etc/mha/app1.conf  --remove_dead_master_conf --ignore_last_failover

#后臺運行，自己想辦法去