MHA安装文档
准备四台服务器
192.168.126.177 manager
192.168.126.178 主
192.168.126.179 从
192.168.126.180 从
四台服务器需要做ssh免密操作：
178、179、180需要安装mariadb
yum -y install mariadb mariadb-server
Mariadb配置文件修改
178，主上的操作：
```bash=
server-id=1
log-bin=mysql-bin
179，从1的操作：
server-id=2
log-bin=slave1-bin
relay-log=slave1-log
180，从2上的操作：
server-id=3
log-bin=slave2-bin
relay-log=slave2-log
开启数据库（mariadb）
systemctl start mariadb
进入数据库做主从复制：
178主上的操作：
grant all on *.* to 'tom'@'192.168.126.%' identified by '123';
179、180两台从上的操作：
change master to master_host='192.168.126.178,master_user='tom',master_password='123',master_log_file='slave1-bin.000003',master_log_pos=519;
set global read_only=1;
178、179、180主从上都需要的操作：
grant all privileges on *.* to 'tom'@'192.168.126.% identified by '123';
四台都做时间同步操作：
yum -y install ntpdate
ntpdate ntp.aliyun.com
四台机器同装node节点，一致操作:
yum -y install perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker perl-DBD-MySQL perl-devel perl-CPAN
mkdir -p /etc/mha
tar zxf mha4mysql-node-0.57.tar.gz -C /etc/mha/
mv /etc/mha/mha4mysql-node-0.57/ /etc/mha/node
cd /etc/mha/node/
perl Makefile.PL
make && make install
177 安装manager节点:
yum -y install epel-release --nogpgcheck
yum install -y perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes
tar zxf mha4mysql-manager-0.57.tar.gz -C /etc/mha/
mv /etc/mha/mha4mysql-manager-0.57/ /etc/mha/manager
cd /etc/mha/manager/
perl Makefile.PL
make && make install
[server default]
manager_workdir=/etc/mha/app1
manager_log=/etc/mha/app1/manager.log
master_binlog_dir="/var/lib/mysql"
remote_workdir=/etc/mha/app1
master_ip_failover_script=/etc/mha/master_ip_failover
master_ip_online_change_script=/etc/mha/master_ip_online_change
report_script=/etc/mha/send_report
user=tom
password=123
repl_user=tom
repl_password=123
ping_interval=1
secondary_check_script= masterha_secondary_check -s 192.168.181.168 -s 192.168.181.169
[server1]
hostname=192.168.181.142
port=3306
ssh_port=22
[server2]
hostname=192.168.181.168
port=3306
ssh_port=22
candidate_master=1
check_repl_delay=0
[server3]
hostname=192.168.181.169
port=3306
no_master=1
ssh_port=22
179,180 两从
set global relay_log_purge=0;
mkdir /var/lib/mysql/logs1
ln /var/lib/mysql/relay-log.* /var/lib/mysql/logs1/
#!/bin/bash
user=root
passwd=123
port=3306
log_dir='/var/lib/mysql/'
work_dir='/var/lib/mysql/logs1'
purge='/usr/local/bin/purge_relay_logs'
if [ ! -d $log_dir ]
then
mkdir $log_dir -p
fi
$purge --user=$user --password=$passwd --disable_relay_log_purge --port=$port --host=localhost --workdir=$work_dir >> $log_dir/purge_relay_logs.log 2>&1
测试
mysqladmin -uroot password 123
purge_relay_logs --user=root --host=localhost --port=3306 --password=123 -disable_relay_log_purge --workdir=/var/lib/mysql/
crontab -e
0 0 */3 * * sh /etc/auto_clean_relay_log.sh
177 179 180 manager+两从
vim /etc/mha/master_ip_failover 自动切换脚本
#!/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 = '192.168.181.111/24';
my $key = '0';
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig ens33:$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";
}
vim /etc/mha/master_ip_online_change 手动切换脚本
#!/usr/bin/env perl
use strict;
use warnings FATAL =>'all';
use Getopt::Long;
my $vip = '192.168.181.111/24'; # Virtual IP
my $key = "0";
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";
my $exit_code = 0;
my (
$command, $orig_master_is_new_slave, $orig_master_host,
$orig_master_ip, $orig_master_port, $orig_master_user,
$orig_master_password, $orig_master_ssh_user, $new_master_host,
$new_master_ip, $new_master_port, $new_master_user,
$new_master_password, $new_master_ssh_user,
);
GetOptions(
'command=s' => \$command,
'orig_master_is_new_slave' => \$orig_master_is_new_slave,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'orig_master_user=s' => \$orig_master_user,
'orig_master_password=s' => \$orig_master_password,
'orig_master_ssh_user=s' => \$orig_master_ssh_user,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
'new_master_user=s' => \$new_master_user,
'new_master_password=s' => \$new_master_password,
'new_master_ssh_user=s' => \$new_master_ssh_user,
);
exit &main();
sub main {
#print "\n\nIN SCRIPT TEST====$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 "\n\n\n***************************************************************\n";
print "Disabling the VIP - $vip on old master: $orig_master_host\n";
print "***************************************************************\n\n\n\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 "\n\n\n***************************************************************\n";
print "Enabling the VIP - $vip on new master: $new_master_host \n";
print "***************************************************************\n\n\n\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 $orig_master_ssh_user\@$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 $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $orig_master_ssh_user\@$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=po
rt -new_master_host=host -new_master_ip=ip -new_master_port=port\n";
}
vim /etc/mha/send_report 报警脚本
#!/usr/bin/perl
use strict;
use warnings FATAL => 'all';
use Mail::Sender;
use Getopt::Long;
#new_master_host and new_slave_hosts are set only when recovering master succeeded
my ( $dead_master_host, $new_master_host, $new_slave_hosts, $subject, $body );
my $smtp='smtp.qq.com';
my $mail_from='[email protected]';
my $mail_user='[email protected]';
my $mail_pass='xxxxxxxxxxxx';
my $mail_to=['[email protected]'];
GetOptions(
'orig_master_host=s' => \$dead_master_host,
'new_master_host=s' => \$new_master_host,
'new_slave_hosts=s' => \$new_slave_hosts,
'subject=s' => \$subject,
'body=s' => \$body,
);
mailToContacts($smtp,$mail_from,$mail_user,$mail_pass,$mail_to,$subject,$body);
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;
}
# Do whatever you want here
exit 0;
177manager：
/etc/mha/manager/bin/masterha_check_ssh --conf=/etc/mha/app1.cnf
/etc/mha/manager/bin/masterha_check_repl --conf=/etc/mha/app1.cnf
出现以下情况说明正确
178主
ifconfig ens33:0 192.168.126.111 netmask 255.255.255.0
130 manager
启动
nohup /etc/mha/manager/bin/masterha_manager --conf=/etc/mha/app1.cnf --ignore_last_failover >/tmp/mha_manager.log < /dev/null 2>&1 &
查看状态
/etc/mha/manager/bin/masterha_check_status --conf=/etc/mha/app1.cnf
测试
tail -300f /etc/mha/app1/manager.log
关闭178主mysql
179服务器 从
Vip漂移到179机器，成为了新主，然后启动旧主178的mariadb，为178和179做主从
Show master status;
178
177
修改配置文件
启动mha:
nohup /etc/mha/manager/bin/masterha_manager --conf=/etc/mha/app1.cnf --ignore_last_failover >/tmp/mha_manager.log < /dev/null 2>&1 &
可以查看当前主的状态:
/etc/mha/manager/bin/masterha_check_status --conf=/etc/mha/app1.cnf
然后去关闭178mariadb:
Systemctl stop mariadb
去178服务器查看，vip漂移到了179上，179成为了新主
然后开启178的mariadb，为178和179做主从
报错解决方案： 报错信息：
解决方案：
grant all on *.* to tom@'192.168.126.%' identified by '123';