MySQL 部署 MHA 高可用架构 (二)

实现 MHA VIP 功能

配置 master_ip_failover 脚本(db3)

把 master_ip_failover 上传到 /iba/software 上

master_ip_failover 文件内容

#!/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 = '192.168.31.88/24';
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$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";
}

cd /iba/software/
cp /iba/software/master_ip_failover /usr/local/bin/

# 修改脚本参数，改为自己的VIP，网卡设备
vi /usr/local/bin/master_ip_failover 
my $vip = '192.168.31.88/24';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";

# 修改 mha 配置 
vi /etc/mha/app1.cnf 
# 在 [server default] 下添加
master_ip_failover_script=/usr/local/bin/master_ip_failover

yum install dos2unix -y
dos2unix /usr/local/bin/master_ip_failover
chmod +x /usr/local/bin/master_ip_failover

在主库上手工生成第一个vip地址

ifconfig eth0:1 192.168.31.88/24

# 手动停止网卡的方法：ifconfig eth0:1 down

重启 MHA manager 使配置生效(db3)

masterha_stop --conf=/etc/mha/app1.cnf
nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover  < /dev/null> /var/log/mha/app1/manager.log 2>&1 &
tail -f /var/log/mha/app1/manager.log

测试

# 停止主库
systemctl stop mysqld

# 查看 ip, 发现 vip 已经飘走
ip add

# 在 db3 上执行
masterha_check_repl  --conf=/etc/mha/app1.cnf

# 结果显示 主库现在为 db1 ，经查看，vip 成功切换到 db1 上。

实现邮件报警

编写发邮件脚本(db3)

# 在 [server default] 下添加
vi /etc/mha/app1.cnf 
report_script=/usr/local/bin/send_report

文件/usr/local/bin/send_report 内容

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
import smtplib
from email.mime.text import MIMEText
from email.header import Header
 
# 第三方 SMTP 服务
mail_host="smtp.126.com"  #设置服务器
mail_user="xxxxx@126.com"    #用户名
mail_pass="xxxxx"   #口令 
 
 
sender = 'xxxxx@126.com'
receivers = 'yyyyyy@qq.com'  # 接收邮件，可设置为你的QQ邮箱或者其他邮箱
 
message = MIMEText('MHA master 已经切换, 请查看', 'plain', 'utf-8')
message['From'] = sender
message['To'] = receivers
 
subject = 'MySQL MHA 邮件'
message['Subject'] = Header(subject, 'utf-8')
 
 
try:
    smtpObj = smtplib.SMTP() 
    smtpObj.connect(mail_host, 25)    # 25 为 SMTP 端口号
    smtpObj.login(mail_user,mail_pass)  
    smtpObj.sendmail(sender, receivers, message.as_string())
    print "邮件发送成功"
except smtplib.SMTPException, e:
    print "Error:", evi /usr/local/bin/send_report

添加执行权限

chmod + x /usr/local/bin/send_report

重启 mha

masterha_stop --conf=/etc/mha/app1.cnf
nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover  < /dev/null> /var/log/mha/app1/manager.log 2>&1 &

MySQL 主库 down 时，切换成功发送邮件

邮件发送成功

来源：https://www.cnblogs.com/klvchen/p/11932120.html

标签

MHA

ssh

ifconfig

mysql

host

master