mysql mha自动切换_mha+mysql自动切换
manager:192.168.2.254
master:192.168.2.252
slave:192.168.2.253
VIP:192.168.2.144
操作系统：centos6.5 64位
1.配置ssh互信(root用户 每台都执行)
# ssh-keygen
# ssh-copy-id 192.168.2.252
# ssh-copy-id 192.168.2.253
# ssh-copy-id 192.168.2.254
2.在manager节点上安装mha
# yum install epel-release
# yum install perl-DBD-MySQL
# yum install perl-Config-Tiny
# yum install perl-Log-Dispatch
# yum install perl-Parallel-ForkManager
# rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm
# rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm
3.在node节点上装Mha(也就是master和slave上)
# yum install epel-release
# yum install perl-DBD-MySQL
4.安装配置mysql半同步插件(master和slave都操作)
mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';
mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';
[mysqld]
rpl_semi_sync_master_enabled=1
rpl_semi_sync_master_timeout=1000
rpl_semi_sync_slave_enabled=1
relay_log_purge=0
skip-name-resolve
server-id = 1 //只是这个参数不一样
log-bin=mysql-bin
read_only=1
slave-skip-errors=1396
在master和slave节点做软连接，否则可能会报错
ln -s /usr/local/mysql/bin/* /usr/bin/
masterha_check_repl --conf=/root/masterha/app1.cnf
masterha_check_ssh --conf=/root/masterha/app1.cnf
5.在master和slave里搭建主从mysql环境
此处略1万行
6.配置管理的MHA
[server default]
manager_workdir=/root/masterha
manager_log=/root/masterha/manager.log
user=root
password=redhat
ssh_user=root
repl_user=webslave
repl_password=redhat
ping_interval=1
shutdown_script=""
master_ip_online_change_script=""
master_ip_failover_script="/root/masterha/master_ip_failover"
report_script=""
[server1]
hostname=192.168.2.252
master_binlog_dir=/usr/local/mysql/data
candidate_master=1
[server2]
hostname=192.168.2.253
master_binlog_dir=/usr/local/mysql/data
candidate_master=1
[server3]
hostname=192.168.2.248
master_binlog_dir=/usr/local/mysql/data
candidate_master=1
master_ip_failover 脚本内容如下:
#!/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, $new_master_user,
$new_master_password
);
my $vip = '192.168.2.144/24'; # Virtual IP
my $key = '1';
my $gateway = '192.168.2.1';
my $ssh_start_vip = "sudo /sbin/ifconfig eth0:$key $vip;sudo /sbin/arping -I eth0 -c 3 -s $vip $gateway >/dev/null 2>&1";
my $ssh_stop_vip = "sudo /sbin/ifconfig eth0:$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" ) {
# $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 "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" ) {
# 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 "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;
}
}
# 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 {
"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";
}
7.MHA启动及基本维护
nohup masterha_manager --conf=/root/masterha/app1.cnf > /tmp/mha_manager.log &1 & --这是启动
masterha_check_ssh --conf=/root/masterha/app1.cnf --查看ssh互信是否正常
masterha_check_repl --conf=/root/masterha/app1.cnf --查看主从复制是否正常
masterha_stop --conf=/root/masterha/app1.cnf --停止
8.测试
1.主库断电
2.主库断网
3.主库重启
4.主库关机
以上情况都测试过都能自动切换~
请看日志分析切换过程
9.主库模拟故障后的恢复
在mha的日志里查看
Sat Jun 13 19:31:17 2015 - [info] All other slaves should start replication from here. Statement should be:
CHANGE MASTER TO MASTER_HOST='192.168.2.253', MASTER_PORT=3306, MASTER_LOG_FILE='binlog.000003', MASTER_LOG_POS=120, MASTER_USER='webslave', MASTER_PASSWORD='xxx';
然后再就得主库里执行下,再start slave ,然后就得主库就变为了新的主库的从库了。
记得看下show slave status\G;