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mysql mha高可用架构
2018-08-10 09:54:23           
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实验环境的搭建:

准备: 在主从复制(GTID)的基础上面去做一主两从,必须保证一主二从可以实时

同步数据。

主从复制可以参考

https://blog.csdn.net/aaaaaab_/article/details/81515111

server1:172.25.38.1(master)

server2:172.25.38.2(slave)

server3:172.25.38.3(slave)

server4:172.25.38.4(mha)

在server1:

[root@server1 MHA]# ls

master_ip_failover

master_ip_online_change

mha4mysql-manager-0.56-0.el6.noarch.rpm

mha4mysql-node-0.56-0.el6.noarch.rpm

perl-Config-Tiny-2.12-7.1.el6.noarch.rpm

perl-Email-Date-Format-1.002-5.el6.noarch.rpm

perl-Log-Dispatch-2.27-1.el6.noarch.rpm

perl-Mail-Sender-0.8.16-3.el6.noarch.rpm

perl-Mail-Sendmail-0.79-12.el6.noarch.rpm

perl-MIME-Lite-3.027-2.el6.noarch.rpm

perl-MIME-Types-1.28-2.el6.noarch.rpm

perl-Parallel-ForkManager-0.7.9-1.el6.noarch.rpm

send_report

[root@server1 MHA]# yum install mha4mysql-node-0.56-0.el6.noarch.rpm -y

这里写图片描述

[root@server1 .ssh]# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

/root/.ssh/id_rsa already exists.

Overwrite (y/n)? y

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

72:c7:15:ad:e4:17:bb:b0:a3:0f:15:48:d8:45:f0:4d root@server1

The key's randomart image is:

+--[ RSA 2048]----+

| oo++.E |

| ...o.+o |

| .o+..o |

| . .+.o |

| . S o .+ . |

| o . .o . |

| .. . |

| .. |

| .. |

+-----------------+

[root@server1 .ssh]# ls

id_rsa id_rsa.pub known_hosts

这里写图片描述

[root@server1 .ssh]# ssh-copy-id root@172.25.38.3

root@172.25.38.3's password:

Now try logging into the machine, with "ssh 'root@172.25.38.3'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@server1 .ssh]# ssh-copy-id root@172.25.38.2

Now try logging into the machine, with "ssh 'root@172.25.38.2'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

这里写图片描述

在server2:

[root@server2 MHA]# ls

master_ip_failover

master_ip_online_change

mha4mysql-manager-0.56-0.el6.noarch.rpm

mha4mysql-node-0.56-0.el6.noarch.rpm

perl-Config-Tiny-2.12-7.1.el6.noarch.rpm

perl-Email-Date-Format-1.002-5.el6.noarch.rpm

perl-Log-Dispatch-2.27-1.el6.noarch.rpm

perl-Mail-Sender-0.8.16-3.el6.noarch.rpm

perl-Mail-Sendmail-0.79-12.el6.noarch.rpm

perl-MIME-Lite-3.027-2.el6.noarch.rpm

perl-MIME-Types-1.28-2.el6.noarch.rpm

perl-Parallel-ForkManager-0.7.9-1.el6.noarch.rpm

send_report

[root@server2 MHA]# yum install mha4mysql-node-0.56-0.el6.noarch.rpm -y

这里写图片描述

[root@server2 MHA]# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

f9:df:dc:8e:9f:b1:69:50:77:88:a8:63:3b:f0:da:7f root@server2

The key's randomart image is:

+--[ RSA 2048]----+

| |

| |

| . . . |

| .. . ..o|

| S. . o|

| . +. . |

| + o. .. |

| .+ .Eo +=|

| ...o... =*+|

+-----------------+

这里写图片描述

[root@server2 MHA]# ssh-copy-id 172.25.38.1

[root@server2 MHA]# ssh-copy-id 172.25.38.3

这里写图片描述

[root@server2 MHA]# mysql -p

mysql> grant replication slave on *.* to yiyi@'172.25.38.%' identified by 'YIYI=bushe24';

Query OK, 0 rows affected, 1 warning (0.00 sec)

这里写图片描述

在server3重新配置slave数据库的初始化:

[root@server3 ~]# ls

MHA

[root@server3 ~]# cd MHA/

[root@server3 MHA]# ls

master_ip_failover

master_ip_online_change

mha4mysql-manager-0.56-0.el6.noarch.rpm

mha4mysql-node-0.56-0.el6.noarch.rpm

perl-Config-Tiny-2.12-7.1.el6.noarch.rpm

perl-Email-Date-Format-1.002-5.el6.noarch.rpm

perl-Log-Dispatch-2.27-1.el6.noarch.rpm

perl-Mail-Sender-0.8.16-3.el6.noarch.rpm

perl-Mail-Sendmail-0.79-12.el6.noarch.rpm

perl-MIME-Lite-3.027-2.el6.noarch.rpm

perl-MIME-Types-1.28-2.el6.noarch.rpm

perl-Parallel-ForkManager-0.7.9-1.el6.noarch.rpm

send_report

[root@server3 MHA]# yum install mha4mysql-node-0.56-0.el6.noarch.rpm -y

这里写图片描述

[root@server3 ~]# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

2b:8b:36:e7:dc:aa:b0:65:10:13:9b:62:b4:16:c2:3f root@server3

The key's randomart image is:

+--[ RSA 2048]----+

|oo. |

|o.o+ |

|.+* |

|o. E |

| . . S |

| . . |

| . o . . |

| =oo.+ |

| ..o==.. |

+-----------------+

这里写图片描述

[root@server3 ~]# ssh-copy-id 172.25.38.1

[root@server3 ~]# ssh-copy-id 172.25.38.2

这里写图片描述

mysql> grant replication slave on *.* to yiyi@'172.25.38.%' identified by 'YIYI=bushe24';

Query OK, 0 rows affected, 1 warning (0.00 sec)

这里写图片描述

在server4(mha主机):

[root@server4 ~]# ls

MHA

[root@server4 ~]# cd MHA/

[root@server4 MHA]# ls

master_ip_failover

master_ip_online_change

mha4mysql-manager-0.56-0.el6.noarch.rpm

mha4mysql-node-0.56-0.el6.noarch.rpm

perl-Config-Tiny-2.12-7.1.el6.noarch.rpm

perl-Email-Date-Format-1.002-5.el6.noarch.rpm

perl-Log-Dispatch-2.27-1.el6.noarch.rpm

perl-Mail-Sender-0.8.16-3.el6.noarch.rpm

perl-Mail-Sendmail-0.79-12.el6.noarch.rpm

perl-MIME-Lite-3.027-2.el6.noarch.rpm

perl-MIME-Types-1.28-2.el6.noarch.rpm

perl-Parallel-ForkManager-0.7.9-1.el6.noarch.rpm

send_report

[root@server4 MHA]# yum install * -y

这里写图片描述

mkdir /etc/mha ##创建工作目录workdir

mkdir /etc/mha ##创建配置文件所在目录

cd /etc/mha/

vim app.conf

[root@server4 mha]# cat app.conf

[server default]

manager_workdir=/usr/local/bingrep master_ip_failover /etc/masterha/app1.cnf

manager_log=/usr/local/bin/mha.log

master_binlog_dir=/var/lib/mysql

#master_ip_failover_script=/usr/local/bin/master_ip_failover

master_ip_online_change_script=/usr/local/bin/master_ip_online_change

user=root

password=Aa@+123456

ping_interval=1

remote_workdir=/tmp

repl_user=yiyi

repl_password=YIYI+bushe24

report_script=/usr/local/send_report

#secondary_check_script=/usr/local/bin/masterha_secondary_check -s server03 -s server02

#shutdown_script=""

ssh_user=root

[server1]

hostname=172.25.38.1

port=3306

[server2]

hostname=172.25.38.2

port=3306

candidate_master=1

check_repl_delay=0

[server3]

hostname=172.25.38.3

port=3306

#no_master=1

这里写图片描述

[root@server4 mha]# masterha_check_ssh --conf=/etc/mha/app.conf

Thu Aug 9 15:40:10 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Thu Aug 9 15:40:10 2018 - [info] Reading application default configuration from /etc/mha/app.conf..

Thu Aug 9 15:40:10 2018 - [info] Reading server configuration from /etc/mha/app.conf..

Thu Aug 9 15:40:10 2018 - [info] Starting SSH connection tests..

Thu Aug 9 15:40:11 2018 - [debug]

Thu Aug 9 15:40:10 2018 - [debug] Connecting via SSH from root@172.25.38.1(172.25.38.1:22) to root@172.25.38.2(172.25.38.2:22)..

Thu Aug 9 15:40:11 2018 - [debug] ok.

Thu Aug 9 15:40:11 2018 - [debug] Connecting via SSH from root@172.25.38.1(172.25.38.1:22) to root@172.25.38.3(172.25.38.3:22)..

Thu Aug 9 15:40:11 2018 - [debug] ok.

Thu Aug 9 15:40:12 2018 - [debug]

Thu Aug 9 15:40:11 2018 - [debug] Connecting via SSH from root@172.25.38.2(172.25.38.2:22) to root@172.25.38.1(172.25.38.1:22)..

Thu Aug 9 15:40:11 2018 - [debug] ok.

Thu Aug 9 15:40:11 2018 - [debug] Connecting via SSH from root@172.25.38.2(172.25.38.2:22) to root@172.25.38.3(172.25.38.3:22)..

Thu Aug 9 15:40:12 2018 - [debug] ok.

Thu Aug 9 15:40:12 2018 - [debug]

Thu Aug 9 15:40:11 2018 - [debug] Connecting via SSH from root@172.25.38.3(172.25.38.3:22) to root@172.25.38.1(172.25.38.1:22)..

Thu Aug 9 15:40:12 2018 - [debug] ok.

Thu Aug 9 15:40:12 2018 - [debug] Connecting via SSH from root@172.25.38.3(172.25.38.3:22) to root@172.25.38.2(172.25.38.2:22)..

Thu Aug 9 15:40:12 2018 - [debug] ok.

Thu Aug 9 15:40:12 2018 - [info] All SSH connection tests passed successfully

这里写图片描述

通过脚本检测状态:

[root@server4 mha]# touch /usr/local/bin/master_ip_failover

[root@server4 mha]# cd /usr/local/bin/

[root@server4 bin]# touch /usr/local/bin/master_ip_online_change

[root@server4 bin]# vim master_ip_failover

[root@server4 bin]# vim master_ip_online_change

[root@server4 bin]# chmod +x master_ip_failover

[root@server4 bin]# chmod +x master_ip_online_change

这里写图片描述

保证三台虚拟机的/etc/my.cnf一致server-id区分即可,在每个虚拟机重启服务即可

[root@server1 ~]# scp /etc/my.cnf server2:/etc/my.cnf

The authenticity of host 'server2 (172.25.38.2)' can't be established.

RSA key fingerprint is 2f:cc:a7:97:6a:d8:41:5b:90:f3:91:b6:e8:87:4c:b3.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added 'server2' (RSA) to the list of known hosts.

my.cnf 100% 1034 1.0KB/s 00:00

[root@server1 ~]# scp /etc/my.cnf server3:/etc/my.cnf

my.cnf 100% 1034 1.0KB/s 00:00

这里写图片描述

开启MHA Manager监控

[root@server4 bin]# masterha_check_repl --conf=/etc/mha/app.conf

Thu Aug 9 23:48:32 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Thu Aug 9 23:48:32 2018 - [info] Reading application default configuration from /etc/mha/app.conf..

Thu Aug 9 23:48:32 2018 - [info] Reading server configuration from /etc/mha/app.conf..

Thu Aug 9 23:48:32 2018 - [info] MHA::MasterMonitor version 0.56.

Thu Aug 9 23:48:32 2018 - [info] GTID failover mode = 1

Thu Aug 9 23:48:32 2018 - [info] Dead Servers:

Thu Aug 9 23:48:32 2018 - [info] Alive Servers:

Thu Aug 9 23:48:32 2018 - [info] 172.25.254.1(172.25.254.1:3306)

Thu Aug 9 23:48:32 2018 - [info] 172.25.254.2(172.25.254.2:3306)

Thu Aug 9 23:48:32 2018 - [info] 172.25.254.3(172.25.254.3:3306)

Thu Aug 9 23:48:32 2018 - [info] Alive Slaves:

Thu Aug 9 23:48:32 2018 - [info] 172.25.254.2(172.25.254.2:3306) Version=5.7.17-log (oldest major version between slaves) log-bin:enabled

Thu Aug 9 23:48:32 2018 - [info] GTID ON

Thu Aug 9 23:48:32 2018 - [info] Replicating from 172.25.254.1(172.25.254.1:3306)

Thu Aug 9 23:48:32 2018 - [info] Primary candidate for the new Master (candidate_master is set)

Thu Aug 9 23:48:32 2018 - [info] 172.25.254.3(172.25.254.3:3306) Version=5.7.17-log (oldest major version between slaves) log-bin:enabled

Thu Aug 9 23:48:32 2018 - [info] GTID ON

Thu Aug 9 23:48:32 2018 - [info] Replicating from 172.25.254.1(172.25.254.1:3306)

Thu Aug 9 23:48:32 2018 - [info] Current Alive Master: 172.25.254.1(172.25.254.1:3306)

Thu Aug 9 23:48:32 2018 - [info] Checking slave configurations..

Thu Aug 9 23:48:32 2018 - [info] read_only=1 is not set on slave 172.25.254.2(172.25.254.2:3306).

Thu Aug 9 23:48:32 2018 - [info] read_only=1 is not set on slave 172.25.254.3(172.25.254.3:3306).

Thu Aug 9 23:48:32 2018 - [info] Checking replication filtering settings..

Thu Aug 9 23:48:32 2018 - [info] binlog_do_db= , binlog_ignore_db=

Thu Aug 9 23:48:32 2018 - [info] Replication filtering check ok.

Thu Aug 9 23:48:32 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking.

Thu Aug 9 23:48:32 2018 - [info] Checking SSH publickey authentication settings on the current master..

Thu Aug 9 23:48:32 2018 - [info] HealthCheck: SSH to 172.25.254.1 is reachable.

Thu Aug 9 23:48:32 2018 - [info]

172.25.254.1(172.25.254.1:3306) (current master)

+--172.25.254.2(172.25.254.2:3306)

+--172.25.254.3(172.25.254.3:3306)

Thu Aug 9 23:48:32 2018 - [info] Checking replication health on 172.25.254.2..

Thu Aug 9 23:48:32 2018 - [info] ok.

Thu Aug 9 23:48:32 2018 - [info] Checking replication health on 172.25.254.3..

Thu Aug 9 23:48:32 2018 - [info] ok.

Thu Aug 9 23:48:32 2018 - [warning] master_ip_failover_script is not defined.

Thu Aug 9 23:48:32 2018 - [warning] shutdown_script is not defined.

Thu Aug 9 23:48:32 2018 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

这里写图片描述

[root@server4 bin]# cat /etc/mha/app.conf

[server default]

manager_workdir=/etc/mha

manager_log=/usr/local/bin/mha.log

master_binlog_dir=/var/lib/mysql

#master_ip_failover_script=/usr/local/bin/master_ip_failover

master_ip_online_change_script=/usr/local/bin/master_ip_online_change

user=root

password=Aa@+123456

ping_interval=1

remote_workdir=/tmp

repl_user=repl

repl_password=Yakexi+007

report_script=/usr/local/send_report

#secondary_check_script=/usr/local/bin/masterha_secondary_check -s server03 -s server02

#shutdown_script=""

ssh_user=root

[server1]

hostname=172.25.254.1

port=3306

[server2]

hostname=172.25.254.2

port=3306

candidate_master=1

check_repl_delay=0

[server3]

hostname=172.25.254.3

port=3306

#no_master=1

这里写图片描述

通过master_check_status脚本查看Manager的状态

[root@server4 bin]# masterha_check_status --conf=/etc/mha/app.conf

app is stopped(2:NOT_RUNNING).

解决报错打开监控即可

[root@server4 bin]# nohup masterha_manager --conf=/etc/mha/app.conf --remove_dead_master_conf --ignore_last_failover < /dev/null > /usr/local/mha/mha.log 2>&1 &

[1] 1646

[root@server4 bin]# masterha_check_status --conf=/etc/mha/app.confapp (pid:1646) is running(0:PING_OK), master:172.25.254.1

这里写图片描述

查看日志会出来成功:

[root@server4 bin]# tail -10 /usr/local/bin/mha.log

172.25.254.1(172.25.254.1:3306) (current master)

+--172.25.254.2(172.25.254.2:3306)

+--172.25.254.3(172.25.254.3:3306)

Thu Aug 9 23:52:03 2018 - [warning] master_ip_failover_script is not defined.

Thu Aug 9 23:52:03 2018 - [warning] shutdown_script is not defined.

Thu Aug 9 23:52:03 2018 - [info] Set master ping interval 1 seconds.

Thu Aug 9 23:52:03 2018 - [warning] secondary_check_script is not defined. It is highly recommended setting it to check master reachability from two or more routes.

Thu Aug 9 23:52:03 2018 - [info] Starting ping health check on 172.25.254.1(172.25.254.1:3306)..

Thu Aug 9 23:52:03 2018 - [info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond..

这里写图片描述

[root@server4 ~]# vim /etc/mha/app.conf

master_ip_failover_script=/usr/local/bin/master_ip_failover

master_ip_online_change_script=/usr/local/bin/master_ip_online_change

#将注释的两行打开,脚本拷到指定位置

分享两个脚本都需要更改虚拟IP:

[root@server4 bin]# cat 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 = '172.25.254.100/24';

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";

}

[root@server4 bin]# cat master_ip_online_change

#!/usr/bin/env perl

use strict;

use warnings FATAL =>'all';

use Getopt::Long;

my $vip = '172.25.254.100/24'; # Virtual IP

my $key = "1";

my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";

my $ssh_stop_vip = "/sbin/ifconfig eth0:$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=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";

}

进行测试:

[root@server1 etc]# /etc/init.d/mysqld stop 将主端关闭mysql

Stopping mysqld: [ OK ]

[root@server1 etc]#

server2会出来顶替成为主端:

[root@server2 MHA]# mysql -pAa@+123456

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 46

Server version: 5.7.17-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show master status;

+------------------+----------+--------------+------------------+----------------------------------------------------------------------------------+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+----------------------------------------------------------------------------------+

| mysql-bin.000001 | 445 | | | bac7ebff-9bde-11e8-8767-5254004b3455:1-2,

c152f584-9bde-11e8-a530-525400e41981:1 |

+------------------+----------+--------------+------------------+----------------------------------------------------------------------------------+

1 row in set (0.00 sec)

mysql> show slave status\G

Empty set (0.00 sec)

这里写图片描述

将server1重新打开还是主端:

[root@server1 etc]# /etc/init.d/mysqld start

Starting mysqld: [ OK ]

[root@server1 etc]# mysql -pAa@+123456

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 4

Server version: 5.7.17-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show master status;

+------------------+----------+--------------+------------------+------------------------------------------+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+------------------------------------------+

| mysql-bin.000003 | 194 | | | bac7ebff-9bde-11e8-8767-5254004b3455:1-2 |

+------------------+----------+--------------+------------------+------------------------------------------+

1 row in set (0.00 sec)

mysql> show slave status\G

Empty set (0.00 sec)

这里写图片描述
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