问题一：

MHA 检查复制集群参数配置时报错Master from which slave replicates is not defined in the configuration file!

Master 192.168.129.100:3306 from which slave 192.168.129.101(192.168.129.101:3306) replicates is not defined in the configuration file!

解决：

是因为MHA配置文件里面缺少了主库的配置
加入
[server1]
hostname=192.168.129.100
port=3306

---

问题二：

Can’t exec “mysqlbinlog”: 没有那个文件或目录 at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.mysqlbinlog version command failed with rc 1:0, please verify PATH,LD_LIBRARY_PATH, and client options at /usr/local/bin/apply_diff_relay_logs line 493.

解决:

在所有节点上执行如下命令
[root@centos7-01 ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
[root@centos7-01 ~]# ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql

[root@centos7-02 ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
[root@centos7-02 ~]# ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql

[root@centos7-03 ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
[root@centos7-03 ~]# ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql

---

问题三：

解决：重写一下master_ip_failover文件

#!/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 = '192.168.129.100';
#my $brdc = '192.168.56.255';
#my $ifdev = 'enp0s8';
#my $key = '1';
#my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev:$key $vip;iptables -F;";
#my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key";

my $vip = '192.168.129.100';
my $key = '0';
my $ssh_start_vip = "ifconfig ens33:0 $vip netmask 255.255.255.0 up";
my $ssh_stop_vip = "/sbin/ifconfig ens33:$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 \"`;
}
# 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 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";
}