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MHA 学习（二）配置文件

发表于：2025-11-13 作者：千家信息网编辑

千家信息网最后更新 2025年11月13日，一配置所有主机的 ssh key 认证ssh-keygen -t rsassh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.10.103二数据库

千家信息网最后更新 2025年11月13日MHA 学习（二）配置文件一配置所有主机的 ssh key 认证
ssh-keygen -t rsa
ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.10.103

二数据库授权
grant all privileges on *.* TO mha@'192.168.%' IDENTIFIED BY 'test';

三配额文件
/etc/masterha_default.cnf
[server default]
user=mha
password=test
ssh_user=root
master_binlog_dir= /zx/mysql/data
remote_workdir=/var/log/mha/app1
# secondary_check_script= masterha_secondary_check -s master1 -s master2
ping_interval=3
master_ip_failover_script=/etc/mha/scripts/master_ip_failover
# shutdown_script= /etc/mha/scripts/power_manager
# report_script= /etc/mha/scripts/send_master_failover_mail
#master_ip_online_change_script=/etc/mha/scripts/master_ip_online_change

[root@manager mha]# cat /etc/mha/app1.cnf
[server default]
manager_log=/var/log/mha/app1/manager.log
manager_workdir=/var/log/mha/app1.log
master_binlog_dir=/zx/mysql/data
password=test
ping_interval=2
repl_password=zhangxu
repl_user=repl_user
ssh_user=root
user=mha

[server1]
candidate_master=1
check_repl_delay=0
hostname=master2
port=3306

[server2]
candidate_master=1
check_repl_delay=0
hostname=master1
port=3306

[root@manager mha]# cat scripts/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 = '192.168.248.100'; # Virtual IP
my $gateway = '192.168.1.1';#Gateway IP
my $interface = 'eth2';
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig $interface:$key $vip;/sbin/arping -I $interface -c 3 -s $vip $gateway >/dev/null 2>&1";
my $ssh_stop_vip = "/sbin/ifconfig $interface:$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";
`ssh $ssh_user\@$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 $ssh_user\@$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";
}

启动脚本

nohup masterha_manager --ignore_last_failover --remove_dead_master_conf --conf=/etc/mha/app1.cnf --remove_dead_master_conf < /dev/null > /var/log/mha/app1/app1.log 2>&1 &

检查复制
masterha_check_repl --conf=/etc/mha/app1.cnf
检查ssh
masterha_check_ssh --conf=/etc/mha/app1.cnf
检查 mha 状态
masterha_check_status --conf=/etc/mha/app1.cnf

切换完成后

进程就死掉了重新修改配置文件

很赞哦！