时间：2021-07-01 10:21:17 帮助过：9人阅读
CentOS6.5x86_64
MySQL5.6.34编译安装版
MHA版本：mha4mysql-manager-0.56-0.el6.noarch.rpm mha4mysql-node-0.56-0.el6.noarch.rpm
节点角色：
node93：10.1.20.93 默认主库
node94：10.1.20.94 从库1，原先主库宕机后可提升为主库【mha管理节点也部署在这台机器上】
node95：10.1.20.95 从库2，不允许提升为主库
准备的VIP是 10.1.20.100/24
node93的/etc/my.cnf配置文件部分关键地方：
[mysqld]
port = 3306
socket = /tmp/mysql.sock
datadir = /bdata/data/nowdb2
innodb_file_per_table=ON
character-set-server = utf8
default_storage_engine = InnoDB
skip-innodb_adaptive_hash_index
master_info_repository = TABLE
relay_log_info_repository = TABLE
relay_log_recovery = 1 #crash safe
log-bin=mysql-bin
binlog_format=row
sync_binlog =1 #确保事务提交的时候BINLOG落盘
log-slave-updates
log_bin_trust_function_creators =1
binlog_rows_query_log_events=ON #记录执行的语句到BINLOG query event
server-id=1020093
relay_log_purge=0
read_only=1
node94的/etc/my.cnf配置文件部分关键地方：
[mysqld]
port = 3306
socket = /tmp/mysql.sock
datadir = /bdata/data/nowdb2
innodb_file_per_table=ON
character-set-server = utf8
default_storage_engine = InnoDB
skip-innodb_adaptive_hash_index
master_info_repository = TABLE
relay_log_info_repository = TABLE
relay_log_recovery = 1 #crash safe
log-bin=mysql-bin
binlog_format=row
sync_binlog =1 #确保事务提交的时候BINLOG落盘
log-slave-updates
log_bin_trust_function_creators =1
binlog_rows_query_log_events=ON #记录执行的语句到BINLOG query event
server-id=1020094
relay_log_purge=0
read_only=1
node95的/etc/my.cnf配置文件部分关键地方：
[mysqld]
port = 3306
socket = /tmp/mysql.sock
datadir = /bdata/data/nowdb2
innodb_file_per_table=ON
character-set-server = utf8
default_storage_engine = InnoDB
skip-innodb_adaptive_hash_index
master_info_repository = TABLE
relay_log_info_repository = TABLE
relay_log_recovery = 1 #crash safe
log-bin=mysql-bin
binlog_format=row
sync_binlog =1 #确保事务提交的时候BINLOG落盘
log-slave-updates
log_bin_trust_function_creators = 1
binlog_rows_query_log_events=ON #记录执行的语句到BINLOG query event
server-id=1020095
relay_log_purge=0
read_only=1
在node93上创建复制权限的账号，GRANT REPLICATION SLAVE ,REPLICATION CLIENT ON *.* TO ‘rpl‘@‘10.1.%.%‘ IDENTIFIED BY ‘rpl‘;
然后配置1主2从，（具体步骤略过）。
注意：我们要确保能成为主库的节点(node93、node94)都存在主从同步账号，如果node94上不存在rpl账号，就到node94节点去手工添加即可。
主从关系建立好后，我们在master上创建个mha管理账号，后期会用到：
grant all on *.* to ‘mhauser‘@‘10.1.%.%‘ identified by ‘Abcd@1234‘;
(管理账号要在node93、node94、node95所有节点都存在)
因为MHA依赖于SSH，因此需要在3台主机之间建立SSH免秘钥登陆。步骤略过。
3个节点都安装perl包：
yum install perl perl-DBD-MySQL perl-CPAN perl-devel perl-Time-HiRes
node93-node95上都安装node包：
rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm
node94上安装Manager包(当然，我们在3个节点都安装上Manager包也没问题)：
rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm
在node94初始化MHA
mkdir /etc/masterha/
vim /etc/masterha/app1.cnf 内容如下：
[server default]
user=mhauser
password=Abcd@1234
manager_workdir=/data/masterha/app1
manager_log=/data/masterha/app1/manager.log
remote_workdir=/data/masterha/app1
ssh_user=root
repl_user=rpl
repl_password=rpl
ping_interval=1
master_binlog_dir=/bdata/data/nowdb2/ # 这个路径和你的mysql的binlog存放路径要一致
master_ip_failover_script=/etc/masterha/master_ip_failover
report_script=/etc/masterha/send_report
#通过第三方机器确认目标主库是否存活,不是必须的,就算没有也是能用
#secondary_check_script=masterha_secondary_check -s remote_host1 -s remote_host2
#故障发生后关闭主机的脚本,不是必须的,但是你要设置为空
# shutdown_script=""
#手动在线切换VIP脚本,不是必须的,就算没有也是能用,
#如果你有keepalived这种来做切换VIP就可以直接不用了
master_ip_online_change_script==/etc/masterha/master_ip_online_change
[server1]
hostname=10.1.20.93
candidate_master=1
[server2]
hostname=10.1.20.94
candidate_master=1
[server3]
hostname=10.1.20.95
no_master=1 # 禁止
在node94上添加脚本/etc/masterha/master_ip_failover (里面填写上相关的VIP的信息)
#!/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,
$orig_master_ssh_port, $new_master_ssh_port
);
my $vip =‘10.1.20.100‘; # Virtual IP
my $devic=‘eth0‘;
my $key = "0";
my$net_mask=‘255.255.255.0‘;
my $ssh_start_vip ="/sbin/ifconfig $devic:$key $vip netmask $net_mask";
my $ssh_stop_vip ="/sbin/ifconfig $devic:$key down";
my$mysql_conf="/etc/my.cnf";
my $open_readonly="/bin/sed-i ‘s/.*read_only.*/read_only=1/g‘ $mysql_conf ";
my $close_readonly="/bin/sed-i ‘s/.*read_only.*/read_only=0/g‘ $mysql_conf ";
my $open_relaylog_purge="/bin/sed-i ‘s/.*relay_log_purge.*/relay_log_purge=0/g‘ $mysql_conf ";
my$close_relaylog_purge="/bin/sed -i‘s/.*relay_log_purge.*/relay_log_purge=0/g‘ $mysql_conf ";
GetOptions(
‘command=s‘ =>\$command,
‘ssh_user=s‘ =>\$ssh_user,
‘orig_master_host=s‘ => \$orig_master_host,
‘orig_master_ip=s‘ =>\$orig_master_ip,
‘orig_master_port=i‘ => \$orig_master_port,
‘orig_master_ssh_port=i‘ => \$orig_master_ssh_port,
‘new_master_host=s‘ => \$new_master_host,
‘new_master_ip=s‘ =>\$new_master_ip,
‘new_master_port=i‘ =>\$new_master_port,
‘new_master_ssh_port=i‘ => \$new_master_ssh_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPTTEST====$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 atglobal catalog database,
# invalidate orig_master_ip here.
my $exit_code = 1;
eval {
print "Disabling the VIP onold 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 atglobal 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 - $vipon 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 thescript.. OK \n";
# `ssh $ssh_user\@cluster1 \"$ssh_start_vip \"`;
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enablethe VIP on the new master
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
print "Disable read_only and relay_log_purge in my.cnf - on the new master - $new_master_host\n";
`ssh $ssh_user\@$new_master_host \" $close_readonly \"`;
`ssh $ssh_user\@$new_master_host \" $close_relaylog_purge \"`;
}
# A simple system call thatdisable the VIP on the old_master
sub stop_vip() {
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
print "Enable read_only and relay_log_purge in my.cnf - on the orig master - $orig_master_host\n";
`ssh $ssh_user\@$orig_master_host \" $open_readonly \"`;
`ssh $ssh_user\@$orig_master_host \" $open_relaylog_purge \"`;
}
sub usage {
"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--orig_master_ssh_port=ssh_port --new_master_ssh_port = ssh_port\n";
}
在node94上添加脚本/etc/masterha/send_report(里面填写上相关的smtp账号的信息)：
#!/usr/bin/perl
# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
## Note: This is a sample scriptand is not complete. Modify the script based on your environment.
use strict;
use warnings FATAL => ‘all‘;
use Mail::Sender;
use Getopt::Long;
#new_master_host and new_slave_hostsare set only when recovering master succeeded
my ( $dead_master_host,$new_master_host, $new_slave_hosts, $subject, $body ,$conf);
my$smtp=‘smtp.exmail.qq.com‘;
my$mail_from=‘zabbix@xxxx.com‘;
my$mail_user=‘zabbix@xxxx.com‘;
my $mail_pass=‘xxxxxxx‘;
my$mail_to=[‘lixxxx@xxxx.com‘];
GetOptions(
‘orig_master_host=s‘ => \$dead_master_host,
‘new_master_host=s‘ =>\$new_master_host,
‘new_slave_hosts=s‘ =>\$new_slave_hosts,
‘subject=s‘ =>\$subject,
‘body=s‘ => \$body,
‘conf=s‘ => \$conf,
);
mailToContacts($smtp,$mail_from,$mail_user,$mail_pass,$mail_to,$subject,$body);
check_if_sendmail_ok(‘/tmp/monitormail.log‘);
sub mailToContacts {
my ( $smtp, $mail_from, $user, $passwd, $mail_to, $subject, $msg ) = @_;
open my $DEBUG, "> /tmp/monitormail.log"
or die "Can‘t open the debug file:$!\n";
my $sender = new Mail::Sender {
ctype => ‘text/plain; charset=utf-8‘,
encoding => ‘utf-8‘,
smtp => $smtp,
from => $mail_from,
auth => ‘LOGIN‘,
TLS_allowed => ‘0‘,
authid => $user,
authpwd => $passwd,
to => $mail_to,
subject => $subject,
debug => $DEBUG
};
$sender->MailMsg(
{ msg => $msg,
debug => $DEBUG
}
) or print $Mail::Sender::Error;
return 1;
}
sub check_if_sendmail_ok{
#>>250 2.0.0 Ok: queued as 3532C6DA009D
#<<QUIT
#>>221 2.0.0 Bye
my$logf = shift;
openRLOG, $logf or die "cannot open file $logf.\n";
my@log = <RLOG>;
closeRLOG;
my$val = 0;
if($log[$#log]=~ m/\>\>\s221\s.*\sBye/){
print"Meet Bye.\t";
$val++;
}
if($log[$#log-1]=~ m/\<\<\sQUIT/){