在上一片博客中，讲述了怎么去配置MHA架构！这片博客不再细说，只说明其中MySQL主从搭建，这里使用的是gtid加上半同步复制！
步骤与上一片博客一样，不同之处在于MySQL主从的搭建！详细的gtid搭建过程https://www.cnblogs.com/wxzhe/p/10055154.html
上一片博客中，把MySQL主从的搭建由filename和pos的过程改变为如下的基于gtid的过程就可以，因此不再详细说明，只展示gtid的搭建！
四台服务器分配如下：
MHA管理节点： 10.0.102.214
MySQL主节点： 10.0.102.204
MySQL从节点1： 10.0.102.179 【这个节点可以作为备用的主】
MySQL从节点2： 10.0.102.221
搭建基于gtid的数据库复制！
第一步：保证三个服务器的数据是一致的【处于一致的状态】
第二步：在主上和备用的主上创建复制账户，用户名和密码要保持一致！
第三步：开启gtid，加载半同步复制的插件！
三台服务器中配置文件加入以下参照：
plugin_dir=/usr/local/mysql/lib/plugin/ #因为这里MySQL5.7是源码安装的位置，若是使用rpm包安装，则注意更改位置plugin_load=semisync_master.so #这两个插件尽量在每个服务器都安装吧 plugin_load=semisync_slave.so gtid-mode=on #开启gtid enforce-gtid-consistency #确保gtid全局的一致性 log-bin=character_set_server=utf8 #设置字符集 log_slave_updates #gtid复制时，一定要开启
设置完配置文件之后，重启服务器，然后再从上执行以下命令！
mysql> change master to master_host="10.0.102.204", master_user="repl",master_password="123456",master_auto_position = 1; Query OK, 0 rows affected, 2 warnings (0.09 sec) mysql> start slave; Query OK, 0 rows affected (0.01 sec)
若上面没有报错，则使用show slave status查看复制的状态！
检查MHA的状态
ssh状态检查：
[root@test3 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf Sun Dec 9 11:42:50 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 11:42:50 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Starting SSH connection tests.. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:50 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [info] All SSH connection tests passed successfully.
masterha_check_ssh --conf=/etc/masterha/app1.cnf
[root@test3 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf Sun Dec 9 11:42:50 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 11:42:50 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:42:50 2018 - [info] Starting SSH connection tests.. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:50 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.204(10.0.102.204:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.179(10.0.102.179:22) to root@10.0.102.221(10.0.102.221:22).. Sun Dec 9 11:42:51 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Sun Dec 9 11:42:51 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.204(10.0.102.204:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [debug] Connecting via SSH from root@10.0.102.221(10.0.102.221:22) to root@10.0.102.179(10.0.102.179:22).. Sun Dec 9 11:42:52 2018 - [debug] ok. Sun Dec 9 11:42:52 2018 - [info] All SSH connection tests passed successfully.[root@test3 ~]# masterha_check_repl --conf=/etc/masterha/app1.cnf Sun Dec 9 11:43:39 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 11:43:39 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:43:39 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 11:43:39 2018 - [info] MHA::MasterMonitor version 0.56. Sun Dec 9 11:43:39 2018 - [info] GTID failover mode = 1Sun Dec 9 11:43:39 2018 - [info] Dead Servers: Sun Dec 9 11:43:39 2018 - [info] Alive Servers: Sun Dec 9 11:43:39 2018 - [info] 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] 10.0.102.179(10.0.102.179:3306) Sun Dec 9 11:43:39 2018 - [info] 10.0.102.221(10.0.102.221:3306) Sun Dec 9 11:43:39 2018 - [info] Alive Slaves: Sun Dec 9 11:43:39 2018 - [info] 10.0.102.179(10.0.102.179:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled Sun Dec 9 11:43:39 2018 - [info] GTID ONSun Dec 9 11:43:39 2018 - [info] Replicating from 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] Primary candidate for the new Master (candidate_master is set) Sun Dec 9 11:43:39 2018 - [info] 10.0.102.221(10.0.102.221:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled Sun Dec 9 11:43:39 2018 - [info] GTID ONSun Dec 9 11:43:39 2018 - [info] Replicating from 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] Not candidate for the new Master (no_master is set) Sun Dec 9 11:43:39 2018 - [info] Current Alive Master: 10.0.102.204(10.0.102.204:3306) Sun Dec 9 11:43:39 2018 - [info] Checking slave configurations.. Sun Dec 9 11:43:39 2018 - [info] read_only=1 is not set on slave 10.0.102.179(10.0.102.179:3306). Sun Dec 9 11:43:39 2018 - [info] read_only=1 is not set on slave 10.0.102.221(10.0.102.221:3306). Sun Dec 9 11:43:39 2018 - [info] Checking replication filtering settings.. Sun Dec 9 11:43:39 2018 - [info] binlog_do_db= , binlog_ignore_db= Sun Dec 9 11:43:39 2018 - [info] Replication filtering check ok. Sun Dec 9 11:43:39 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Sun Dec 9 11:43:39 2018 - [info] Checking SSH publickey authentication settings on the current master.. Sun Dec 9 11:43:39 2018 - [info] HealthCheck: SSH to 10.0.102.204 is reachable. Sun Dec 9 11:43:39 2018 - [info] 10.0.102.204(10.0.102.204:3306) (current master) +--10.0.102.179(10.0.102.179:3306) +--10.0.102.221(10.0.102.221:3306)Sun Dec 9 11:43:39 2018 - [info] Checking replication health on 10.0.102.179.. Sun Dec 9 11:43:39 2018 - [info] ok. Sun Dec 9 11:43:39 2018 - [info] Checking replication health on 10.0.102.221.. Sun Dec 9 11:43:39 2018 - [info] ok. Sun Dec 9 11:43:39 2018 - [info] Checking master_ip_failover_script status: Sun Dec 9 11:43:39 2018 - [info] /usr/local/bin/master_ip_failover --ssh_user=root --command=status --ssh_user=root --orig_master_host=10.0.102.204 --orig_master_ip=10.0.102.204 --orig_master_port=3306 IN SCRIPT TEST====service keepalived stop==service keepalived start===Checking the Status of the script.. OK Sun Dec 9 11:43:39 2018 - [info] OK. Sun Dec 9 11:43:39 2018 - [warning] shutdown_script is not defined. Sun Dec 9 11:43:39 2018 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK.[root@test3
复制状态检查：
Sun Dec 9 12:14:28 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun Dec 9 12:14:28 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun Dec 9 12:14:28 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun Dec 9 12:14:28 2018 - [info] MHA::MasterMonitor version 0.56. Sun Dec 9 12:14:28 2018 - [info] GTID failover mode = 1Sun Dec 9 12:14:28 2018 - [info] Dead Servers: Sun Dec 9 12:14:28 2018 - [info] Alive Servers: Sun Dec 9 12:14:28 2018 - [info] 10.0.102.204(10.0.102.204:3306) Sun Dec 9 12:14:28 2018 - [info] 10.0.102.179(10.0.102.179:3306) Sun Dec 9 12:14:28 2018 - [info] 10.0.102.221(10.0.102.221:3306) Sun Dec 9 12:14:28 2018 - [info] Alive Slaves: Sun Dec 9 12:14:28 2018 - [info] 10.0.102.179(10.0.102.179:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled Sun Dec 9 12:14:28 2018 - [info] GTID ONSun Dec 9 12:14:28 2018 - [info] Replicating from 10.0.102.204(10.0.102.204:3306) Sun Dec 9 12:14:28 2018 - [info] Primary candidate for the new Master (candidate_master is set) Sun Dec 9 12:14:28 2018 - [info] 10.0.102.221(10.0.102.221:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled Sun Dec 9 12:14:28 2018 - [info] GTID ONSun Dec 9 12:14:28 2018 - [info] Replicating from 10.0.102.204(10.0.102.204:3306) Sun Dec 9 12:14:28 2018 - [info] Not candidate for the new Master (no_master is set) Sun Dec 9 12:14:28 2018 - [info] Current Alive Master: 10.0.102.204(10.0.102.204:3306) Sun Dec 9 12:14:28 2018 - [info] Checking slave configurations.. Sun Dec 9 12:14:28 2018 - [info] read_only=1 is not set on slave 10.0.102.179(10.0.102.179:3306). Sun Dec 9 12:14:28 2018 - [info] read_only=1 is not set on slave 10.0.102.221(10.0.102.221:3306). Sun Dec 9 12:14:28 2018 - [info] Checking replication filtering settings.. Sun Dec 9 12:14:28 2018 - [info] binlog_do_db= , binlog_ignore_db= Sun Dec 9 12:14:28 2018 - [info] Replication filtering check ok. Sun Dec 9 12:14:28 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Sun Dec 9 12:14:28 2018 - [info] Checking SSH publickey authentication settings on the current master.. Sun Dec 9 12:14:28 2018 - [info] HealthCheck: SSH to 10.0.102.204 is reachable. Sun Dec 9 12:14:28 2018 - [info] 10.0.102.204(10.0.102.204:3306) (current master) +--10.0.102.179(10.0.102.179:3306) +--10.0.102.221(10.0.102.221:3306)Sun Dec 9 12:14:28 2018 - [info] Checking replication health on 10.0.102.179.. Sun Dec 9 12:14:28 2018 - [info] ok. Sun Dec 9 12:14:28 2018 - [info] Checking replication health on 10.0.102.221.. Sun Dec 9 12:14:28 2018 - [info] ok. Sun Dec 9 12:14:28 2018 - [info] Checking master_ip_failover_script status: Sun Dec 9 12:14:28 2018 - [info] /usr/local/bin/master_ip_failover --ssh_user=root --command=status --ssh_user=root --orig_master_host=10.0.102.204 --orig_master_ip=10.0.102.204 --orig_master_port=3306 IN SCRIPT TEST====service keepalived stop==service keepalived start===Checking the Status of the script.. OK Sun Dec 9 12:14:28 2018 - [info] OK. Sun Dec 9 12:14:28 2018 - [warning] shutdown_script is not defined. Sun Dec 9 12:14:28 2018 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK.
masterha_check_repl --conf=/etc/masterha/app1.cnf
复制状态信息中会显示gtid的信息提示！
若上面两步检查都没有错误，可以开启MHA的监控！
nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover &
查看MHA的运行状态：
[root@test3 ~]# masterha_check_status --conf=/etc/masterha/app1.cnf app1 (pid:22124) is running(0:PING_OK), master:10.0.102.204#显示app1正在运行，集群中主服务器为10.0.102.204
这时候MHA集群已经搭建完毕，只要停掉主服务器，就会自动选择备用的从作为主服务器的！
配置VIP漂移
目前集群master是204这台服务器，想一个场景，前端应用正在连接这台数据库，然后master服务器因某种原因宕掉了，这时候在MHA看来，我们可以把备用的主也就是179这台服务器作为新的master，维持集群的正常运行；但是对于前端应用来说，不可能集群没宕一次就修改一次源码中的数据库的IP地址。我们需要一个VIP来和前端相连，这个VIP总是指向正常运行数据库服务器！
MHA引入VIP有两种方式，一种是使用keepalive，另一种是使用MHA自带的脚本！
使用keepalive配置VIP漂移
按照keepalive软件，在当前的主和要作为备份的主上，按照keepalive！
#直接yum按照即可 yum install -y keepalived
然后编辑配置文件，yum安装默认配置在/etc/下面
/etc/keepalived/! Configuration File .. /etc/keepalived/! Configuration File ..
注意：上面两台服务器的keepalived都设置为了BACKUP模式，在keepalived中2种模式，分别是master->backup模式和backup->backup模式。这两种模式有很大区别。在master->backup模式下，一旦主库宕机，虚拟ip会自动漂移到从库，当主库修复后，keepalived启动后，还会把虚拟ip抢占过来，即使设置了非抢占模式（nopreempt）抢占ip的动作也会发生。在backup->backup模式下，当主库宕机后虚拟ip会自动漂移到从库上，当原主库恢复和keepalived服务启动后，并不会抢占新主的虚拟ip，即使是优先级高于从库的优先级别，也不会发生抢占。为了减少ip漂移次数，通常是把修复好的主库当做新的备库。
keepalive配置完成之后，启动keepalive，可以先测试keepalive是否会完成VIP的漂移！
keepalive配置完成之后，可以设置failover脚本！
需要注意的是，这里我们要测试VIP漂移，因此需要指定failover的脚本位置，在配置文件中指定！
datamysqldata masterha_secondary_check s test1 s mgt01 usrlocalbinmaster_ip_failover # shutdown_script scriptmasterha usrlocalbin scriptmasterhamaster_ip_online_change
failover脚步需要自己编辑，在网上找了http://www.ywnds.com/?p=8116 这片博客中给出的failover脚步，测试的时候有点问题，MHA得不到failover的状态！我自己改了一下【删了两个变量的引用】，能用，如下！
#!/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 $ssh_start_vip = "service keepalived start";
#my $ssh_start_vip = "systemctl start keepalived.service";
#my $ssh_stop_vip = "systemctl stop keepalived.service";
my $ssh_stop_vip = "service keepalived stop";
GetOptions( 'command=s' => \$command, 'ssh_user=s' => \$ssh_user, 'orig_master_host=s' => \$orig_master_host, 'orig_master_ip=s' => \$orig_master_ip, 'orig_master_port=i' => \$orig_master_port, 'new_master_host=s' => \$new_master_host, 'new_master_ip=s' => \$new_master_ip, 'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$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 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";
#`ssh $ssh_user\@cluster1 \" $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 $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() { return 0 unless ($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 master_ip_failover
配置了脚本之后，再次检查复制状态：
masterha_check_repl --conf=/etc/masterha/app1.cnf
若复制状态检查中，显示failover错误的信息，可以单独执行下面的命令，查看脚本的状态及报错提示！
/usr/local/bin/master_ip_failover --ssh_user=root --command=status --ssh_user=root --orig_master_host=10.0.102.179 --orig_master_ip=10.0.102.179 --orig_master_port=3306
开启MHA的监控状态，若正常启动没有报错，则说明配置完成！
当前的状态是：
204的服务器是当前的master，并且有VIP。
179服务器上是备用的主。
221服务器仅是从！
停掉204的数据库服务，查看vip是否会转移到179上，集群的主服务器是否也会转到179上？
停掉204的数据库
[root@test2 ~: lo:
查看179服务器的VIP：
#可以看到VIP已经漂移，并且179服务器已经变为master服务器！ [root@test1 ~: lo:
还可以MHA的日志：
cat /data/log/app1/manager.log
上面使用keepalive来做高可用，完成了VIP的漂移的测试，下面使用MHA自带的脚本来测试一下！
使用自带脚本配置VIP漂移
需要修改master_ip_failover脚本。
注意修改脚本中的VIP地址，以及ifconfig命令的绝对路径！
#!/usr/bin/env perluse 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 = '10.0.102.110/22';
my $key = '0';
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";
}
cat /usr/local/bin/master_ip_failover
注意要给脚本加上可执行权限
chmod +x master_ip_failover
然后修改配置文件：
=/data/log/app1/=/data/log/=/data/=/usr/local/bin/===/data/log/===/usr/local/bin/=masterha_secondary_check -s test1 -s mgt01 --user=root --port= --master_host=test2 --master_port======.=
[server2] candidate_master=1hostname=10.0.102.179port=3306
=.==
然后进行repl测试，若测试通过，在启动MHA监控！
使用自带的脚本做failover需要手动添加虚拟IP，在当前的master上添加VIP！
[root@test1 ~]# ifconfig eth0:0 10.0.102.110/22 #添加虚拟IP[root@test1 ~]# ifconfigeth0 Link encap:Ethernet HWaddr FA:BC:66:8D:2E:00 inet addr:10.0.102.179 Bcast:10.0.103.255 Mask:255.255.252.0 inet6 addr: fe80::f8bc:66ff:fe8d:2e00/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3861480 errors:0 dropped:0 overruns:0 frame:0 TX packets:1279028 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7747611623 (7.2 GiB) TX bytes:2717743084 (2.5 GiB) eth0:0 Link encap:Ethernet HWaddr FA:BC:66:8D:2E:00 inet addr:10.0.102.110 Bcast:10.0.103.255 Mask:255.255.252.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2742 errors:0 dropped:0 overruns:0 frame:0 TX packets:2742 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:370558 (361.8 KiB) TX bytes:370558 (361.8 KiB)
这是179的服务器上即有虚拟IP，也是MySQL集群的主服务器！然后停掉MySQL服务，查看VIP的漂移和主从的切换！
[root@test1 ~]# service mysqld stop #停掉主服务器，虚拟IP已经漂移 Shutting down MySQL............ SUCCESS! [root@test1 ~]# ifconfigeth0 Link encap:Ethernet HWaddr FA:BC:66:8D:2E:00 inet addr:10.0.102.179 Bcast:10.0.103.255 Mask:255.255.252.0 inet6 addr: fe80::f8bc:66ff:fe8d:2e00/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3864276 errors:0 dropped:0 overruns:0 frame:0 TX packets:1280993 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7747800974 (7.2 GiB) TX bytes:2717898739 (2.5 GiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2744 errors:0 dropped:0 overruns:0 frame:0 TX packets:2744 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:370642 (361.9 KiB) TX bytes:370642 (361.9 KiB)
在备用主服务器204上查看：
[root@test2 ~]# ip addr1: lo:mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever2: eth0:mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether fa:1d:ae:12:52:00 brd ff:ff:ff:ff:ff:ff inet 10.0.102.204/22 brd 10.0.103.255 scope global eth0 inet 10.0.102.110/22 brd 10.0.103.255 scope global secondary eth0:0 inet6 fe80::f81d:aeff:fe12:5200/64 scope link valid_lft forever preferred_lft forever [root@test2 ~]# mysql -e "show processlist"+----+------+--------------------+------+------------------+------+---------------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+------+--------------------+------+------------------+------+---------------------------------------------------------------+------------------+ | 19 | repl | 10.0.102.221:52375 | NULL | Binlog Dump GTID | 1860 | Master has sent all binlog to slave; waiting for more updates | NULL | | 20 | root | localhost | NULL | Query | 0 | starting | show processlist | +----+------+--------------------+------+------------------+------+---------------------------------------------------------------+------------------+[root@test2 ~]#
可以看到虚拟IP已经漂移，并且主从已经切换！