MHA installation document
Prepare four servers
192.168.126.177 manager
192.168.126.178 master
192.168.126.179 slave
192.168.126.180 slave
Four servers need to do ssh secret-free operation:
178, 179, 180 need to install mariadb
yum -y install mariadb mariadb-server
Mariadb configuration file modification
178. Operation on the master:
```bash=
server-id=1
log-bin=mysql-bin
179, operation from 1:
server-id=2
log-bin=slave1-bin
relay-log=slave1-log
180, from the operation on 2:
server-id=3
log-bin=slave2-bin
relay-log=slave2-log
Open the database (mariadb)
systemctl start mariadb
Enter the database to do master-slave replication:
Operation on the 178 master:
grant all on *.* to 'tom'@'192.168.126.%' identified by '123';
Operation of 179 and 180 from above:
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;
Operations required for 178, 179, and 180 master and slave:
grant all privileges on *.* to 'tom'@'192.168.126.% identified by '123';
All four stations do time synchronization operation:
yum -y install ntpdate
ntpdate ntp.aliyun.com
The four machines are installed with node nodes and operate in the same way:
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 Install the manager node:
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 two slaves
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
test
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+two slaves
vim /etc/mha/master_ip_failover automatically switch script
#!/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 Manually switch scripts
#!/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 alarm script
#!/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
The following conditions are correct
178 masters
ifconfig ens33:0 192.168.126.111 netmask 255.255.255.0
130 manager
start up
nohup /etc/mha/manager/bin/masterha_manager --conf=/etc/mha/app1.cnf --ignore_last_failover >/tmp/mha_manager.log < /dev/null 2>&1 &
Check status
/etc/mha/manager/bin/masterha_check_status --conf=/etc/mha/app1.cnf
test
tail -300f /etc/mha/app1/manager.log
Close 178 main mysql
179 servers from
Vip drifted to the 179 machine and became the new master, and then activated the mariadb of the old master 178, acting as master-slave for 178 and 179
Show master status;
178
177
Modify the configuration file
Start mha:
nohup /etc/mha/manager/bin/masterha_manager --conf=/etc/mha/app1.cnf --ignore_last_failover >/tmp/mha_manager.log < /dev/null 2>&1 &
You can view the status of the current master:
/etc/mha/manager/bin/masterha_check_status --conf=/etc/mha/app1.cnf
Then go to close 178mariadb:
Systemctl stop mariadb
Go to the 178 server to check, VIP drifted to 179, and 179 became the new master.
Then open the mariadb of 178 to act as master and slave for 178 and 179.
Error report solution: Error message:
solution:
grant all on *.* to tom@'192.168.126.%' identified by '123';