MHA MySQL 高可用集群搭建

软件版本
MySQL: 5.7
MHA: 0.56
CentOS: 7.4

MySQL服务器
Master: 192.168.1.224 mysql01
Slave1: 192.168.1.225 mysql02
Slave2: 192.168.1.226 mysql03

MHA
Manager: 192.168.1.224 mysql01
Node1: 192.168.1.225 mysql02
Node2: 192.168.1.226 mysql03

VIP
192.168.1.221

配置主机解析

cat /etc/hosts
192.168.1.224   mysql01
192.168.1.225   mysql02
192.168.1.226   mysql03

在三台服务器搭建MySQL主从复制集群
1、配置MySQL yum安装源

cat /etc/yum.repos.d/MySQL.repo 
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

2、安装MySQL

yum install mysql-community-{server,client,common,libs}-*

3、修改配置文件

#Master
server-id=1
gtid_mode=on
enforce_gtid_consistency=on
log_bin
binlog_format=row
#Slave1
server-id=2
log_bin
gtid_mode=on
enforce_gtid_consistency=on
log_slave_updates=1
binlog_format=row
#Slave2
server-id=3
log_bin
gtid_mode=on
enforce_gtid_consistency=on
log_slave_updates=1
binlog_format=row

4、启动MySQL,并获取初始密码

systemctl start mysqld
grep password /var/log/mysqld.log

5、在三台服务器上修改root密码和创建复制账户

mysql -u root -p
set sql_log_bin=0;
alter user root@'localhost' identified by 'MySQL5.7';
create user root@'192.168.1.%' identified by 'MySQL5.7'
grant all on *.* to root@'192.168.1.%';
flush privileges; 
set sql_log_bin=1;

6、指定Slave的Master,启动slave,查看状态

change master to master_host='192.168.1.224',master_user='root',master_password='MySQL5.7',master_auto_position=1;
start slave;
show slave status\G

在三台服务器实现免密码登录

ssh-keygen -t rsa
ssh-copy-id mysql01
ssh-copy-id mysql02
ssh-copy-id mysql03

安装MHA
1、配置epel源,安装依赖包

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum install -y perl-CPAN* perl-DBD-MySQL* perl-Params-Validate perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes

2、在三台服务器上安装node

tar -zxvf mha4mysql-node-0.56.tar.gz 
cd mha4mysql-node-0.56
perl Makefile.PL
make && make install

3、在Mater安装manager

tar -zxvf mha4mysql-manager-0.57.tar.gz 
perl Makefile.PL
make 
make install

4、创建目录和配置文件

mkdir -p /usr/local/mha
mkdir -p /etc/mhacd /etc/mha/
cat /etc/mha/mha.conf 
----------------------------------------------------------------------------------------------------
[server default]
user=root
password=MySQL5.7
manager_workdir=/usr/local/mha
manager_log=/usr/local/mha/manager.log
remote_workdir=/usr/local/mha
ssh_user=root
repl_user=root
repl_password=MySQL5.7
ping_interval=1
master_ip_failover_script=/usr/local/scripts/master_ip_failover
master_ip_online_change_script=/usr/local/scripts/master_ip_online_change

[server1]
hostname=192.168.1.224
ssh_port=22
master_binlog_dir=/var/lib/mysql
candidate_master=1
port=3306

[server2]
hostname=192.168.1.225
ssh_port=22
master_binlog_dir=/var/lib/mysql
candidate_master=1
port=3306

[server3]
hostname=192.168.1.226
ssh_port=22
master_binlog_dir=/var/lib/mysql
no_master=1
port=3306
----------------------------------------------------------------------------------------------------

5、创建目录和脚本,注意根据具体情况修个IP和网卡名

mkdir -p /usr/local/scripts
cat /usr/local/scripts/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 = '192.168.1.221/24';  
my $key = '0';  
my $ssh_start_vip = "/sbin/ifconfig ens160:$key $vip";  
my $ssh_stop_vip = "/sbin/ifconfig ens160:$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";  
}
----------------------------------------------------------------------------------------------------
cat /usr/local/scripts/master_ip_online_change 
----------------------------------------------------------------------------------------------------
#!/usr/bin/env perl  
use strict;  
use warnings FATAL =>'all';  

use Getopt::Long;  

my $vip = '192.168.1.221/24';  # Virtual IP  
my $key = "0";  
my $ssh_start_vip = "/sbin/ifconfig ens160:$key $vip";  
my $ssh_stop_vip = "/sbin/ifconfig ens160:$key down";  
my $exit_code = 0;  

my (  
  $command,              $orig_master_is_new_slave, $orig_master_host,  
  $orig_master_ip,       $orig_master_port,         $orig_master_user,  
  $orig_master_password, $orig_master_ssh_user,     $new_master_host,  
  $new_master_ip,        $new_master_port,          $new_master_user,  
  $new_master_password,  $new_master_ssh_user,  
);  
GetOptions(  
  'command=s'                => \$command,  
  'orig_master_is_new_slave' => \$orig_master_is_new_slave,  
  'orig_master_host=s'       => \$orig_master_host,  
  'orig_master_ip=s'         => \$orig_master_ip,  
  'orig_master_port=i'       => \$orig_master_port,  
  'orig_master_user=s'       => \$orig_master_user,  
  'orig_master_password=s'   => \$orig_master_password,  
  'orig_master_ssh_user=s'   => \$orig_master_ssh_user,  
  '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,  
  'new_master_ssh_user=s'    => \$new_master_ssh_user,  
);  

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 "\n\n\n***************************************************************\n";  
            print "Disabling the VIP - $vip on old master: $orig_master_host\n";  
            print "***************************************************************\n\n\n\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 "\n\n\n***************************************************************\n";  
            print "Enabling the VIP - $vip on new master: $new_master_host \n";  
            print "***************************************************************\n\n\n\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 $orig_master_ssh_user\@$orig_master_host \" $ssh_start_vip \"`;  
        exit 0;  
}  
else {  
&usage();  
        exit 1;  
}  
}  

# A simple system call that enable the VIP on the new master  
sub start_vip() {  
`ssh $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`;  
}  
# A simple system call that disable the VIP on the old_master  
sub stop_vip() {  
`ssh $orig_master_ssh_user\@$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=po  
rt –new_master_host=host –new_master_ip=ip –new_master_port=port\n";  

}
----------------------------------------------------------------------------------------------------
chmod +x /usr/local/scripts/*

6、检查配置

/usr/local/bin/masterha_check_ssh --conf=/etc/mha/mha.conf

7、在Master上添加vip、启动mha、检查状态

ip addr add 192.168.1.221 dev ens160
nohup masterha_manager --conf=/etc/mha/mha.conf > /tmp/mha_manager.log  < /dev/null 2>&1 &
masterha_check_status --conf=/etc/mha/mha.conf

注意:切换后需要将mha.failover.complete文件删除,否则后面切换会失败

参考文档:企业中MySQL主流高可用架构实战三部曲之MHA

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