mha总结
一.功能
1.自动的master监控及故障切换（10-30s）
9-12s检测到主节点故障
7-10s关闭主机避免脑裂
几秒钟应用relay log
2.人为的主节点故障切换
3.非人为的主节点故障切换（如果已经部署了主节点故障检测监控，可以用这种模式）
4.在线的主节点切换
二.架构
三.安装
下载地址
https://github.com/yoshinorim/mha4mysql-manager/releases
https://github.com/yoshinorim/mha4mysql-node/releases
前提条件，一主两从配置及互信
安装依赖
yum install epel-release
yum install perl-DBD-MySQL perl-CPAN -y
yum install -y perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes
yum update -y
所有节点安装mha-node
$ tar xvf mha4mysql-node-0.58.tar.gz
$ cd mha4mysql-node-0.58
$ perl Makefile.PL
$ make && make install
安装完成后 /usr/local/bin 下会出现4个脚本
apply_diff_relay_logs //识别差异的中继日志事件并将其差异的事件应用于其他的slave
save_binary_logs //保存和复制master的二进制日志
filter_mysqlbinlog //去除不必要的ROLLBACK事件（MHA已不再使用这个工具）
purge_relay_logs //清除中继日志（不会阻塞SQL线程）
安装mha-manager
$ tar xvf mha4mysql-manager-0.58.tar.gz
$ cd mha4mysql-manager-0.58
$ perl Makefile.PL
$ make && make install
安装完成后 /usr/local/bin下出现以下脚本
masterha_check_repl
masterha_check_ssh
masterha_check_status
masterha_conf_host
masterha_manager
masterha_master_monitor
masterha_master_switch
masterha_secondary_check
masterha_stop
配置文件
[server default] manager_log=/root/duanzexun/mha/log/manager.log manager_workdir=/root/duanzexun/mha master_binlog_dir=/data0/mha/3306/mysql-bin master_ip_failover_script=/root/duanzexun/mha/config/master_ip_failover master_ip_online_change_script=/root/duanzexun/mha/config/master_ip_failover_online password=Dba@2019huohua! ping_interval=3 remote_workdir=/root/duanzexun/mha repl_password=Dba@2019huohua! repl_user=root secondary_check_script=/usr/local/bin/masterha_secondary_check -s 10.89.91.181 -s 10.89.91.203 --user=root --port=22 --master_host=10.89.91.231 --master_port=3306 ssh_port=22 ssh_user=root user=root [server1] candidate_master=1 hostname=10.89.91.231 port=3306 [server2] candidate_master=1 hostname=10.89.91.203 port=3306 [server3] candidate_master=1 hostname=10.89.91.181 port=3306
master_ip_failover_online
#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
my (
$command, $orig_master_host, $orig_master_ip,
$orig_master_port, $new_master_host, $new_master_ip, $new_master_port
);
my $vip = '10.10.200.44/24';
my $key = '0';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
my $ssh_user = 'root';
GetOptions(
'command=s' => \$command,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$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";
}
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 = '10.10.200.44/24';
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";
}
切换步骤可以参考
https://www.cnblogs.com/cmgg/p/11070599.html
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