MHA的安装和部署步骤
本篇内容介绍了"MHA的安装和部署步骤"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
##################MHA安装和部署####################
1.服务器
192.168.0.21 mydb1 #Master
192.168.0.22 mydb2 #Slave
192.168.0.23 mydb3 #MHA manager
2. 所有机器修改vim /etc/hosts
192.168.0.21 mydb1
192.168.0.22 mydb2
192.168.0.23 mydb3
3.设置SSH公钥免密码登录
#root用户操作(/root),pwd
mkdir ~/.ssh
chmod 700 ~/.ssh
cd ~/.ssh
ssh-keygen -t rsa #一直回车
ls -al
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
ls -al
chmod 600 ~/.ssh/authorized_keys
cd ..
scp -r .ssh 192.168.0.22:/root/
scp -r .ssh 192.168.0.23:/root/
ssh mydb1
ssh mydb2
ssh mydb3
4.下载mha4mysql-manager和mha4mysql-node
https://github.com/yoshinorim/mha4mysql-manager
https://github.com/yoshinorim/mha4mysql-node
5.在三个节点（node 和 manager）安装perl-DBD-MySQL，用光盘作yum源，#包括了3个包：Perl-DBD-MySQL,mysql-libs,perl-DBI
yum install perl-DBD-MySQL
yum install perl-DBI
yum install mysql-libs
6.在三个节点安装node（包括管理节点）
tar xzvf mha4mysql-node-0.56.tar.gz
cd mha4mysql-node-0.56
perl Makefile.PL
make && make install
7.在管理节点安装manager
rpm -ivh perl-Config-Tiny-2.12-1.el5.rf.noarch.rpm
rpm -ivh perl-Params-Validate-0.95-1.el5.rf.i386.rpm
rpm -ivh perl-MIME-Types-1.28-2.el6.noarch.rpm
rpm -ivh perl-Email-Date-Format-1.002-5.el6.noarch.rpm
rpm -ivh perl-Mail-Sender-0.8.16-3.el6.noarch.rpm
rpm -ivh perl-Mail-Sendmail-0.79-12.el6.noarch.rpm
rpm -ivh perl-TimeDate-1.16-11.1.el6.noarch.rpm
rpm -ivh perl-MailTools-2.04-4.el6.noarch.rpm
rpm -ivh perl-MIME-Lite-3.027-2.el6.noarch.rpm
rpm -ivh perl-Log-Dispatch-2.26-1.el5.rf.noarch.rpm
rpm -ivh perl-Parallel-ForkManager-0.7.5-2.2.el5.rf.noarch.rpm
yum install perl-Time-HiRes #光盘yum源
tar xzvf mha4mysql-manager-0.56.tar.gz
cd mha4mysql-manager-0.56
perl Makefile.PL
make && make install
####################常用命令###############
/usr/local/bin/masterha_check_ssh --conf=/u01/mha/etc/app.cnf
/usr/local/bin/masterha_check_repl --conf=/u01/mha/etc/app.cnf
/usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf &
/u01/mha/etc/masterha_check_status --conf=/u01/mha/etc/app.cnf
/usr/local/bin/masterha_stop --conf=/u01/mha/etc/app.cnf
###################切换######################
一、failover故障切换
1.模拟主库宕机
[root@mydb3~]# ssh mydb1 "killall -r mysqld"
2.查看管理节点日志，可以看到VIP已经漂移
[root@mydb3 ~]# cat /u01/mha/log/manager.log |grep -i vip
3. 验证VIP是否位于节点mydb2
[root@mydb3 ~]# ssh mydb2 "ifconfig |grep 0.201 -B1"
4. 查看管理节点MHA切换日志
[root@mydb3 ~]# tail /u01/mha/log/manager.log
5. new master(old slave)
show master status\G
6. new slave(old:master)
(1)打开MySQL
mysqld_safe --defaults-file=/u01/my3306/my.cnf &
(2)检查数据库
show master status\G
show slave status\G
(3)在管理节点日志中查主库的日志文件和位置
cat /u01/mha/etc/app/manager.log |grep -i change
(4)在slave连接master
CHANGE MASTER TO
MASTER_HOST='192.168.0.21',
MASTER_PORT=3306,
MASTER_LOG_FILE='mysql-bin.000005',
MASTER_LOG_POS=120,
MASTER_USER='repl',
MASTER_PASSWORD='123456';
7.启动管理节点
/usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf &
/usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf --ignore_last_failover &
二、switchover线上切换
1.master：关闭event_scheduler（即192.168.0.21）
set global event_scheduler=off;
2.manager：关闭管理进程 （即192.168.0.23）
/usr/local/bin/masterha_stop --conf=/u01/mha/etc/app.cnf
3.manager：检查配置文件
/u01/mha/etc/app.cnf 有没有被修改破坏。如果破坏需要重新编辑正确配置文件：/u01/mha/etc/app.cnf
cp /u01/mha/etc/app.cnf.bak /u01/mha/etc/app.cnf
4.开始切换：
/u01/mha/etc/masterha_master_switch --master_state=alive --conf=/u01/mha/etc/app.cnf
5.new master(old slave)
mysql> show master status\G
*************************** 1. row ***************************
File: binlog.000021
Position: 299
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
6.new slave(old master)
CHANGE MASTER TO
MASTER_HOST='192.168.0.22',
MASTER_PORT=3306,
MASTER_LOG_FILE='binlog.000021',
MASTER_LOG_POS=299,
MASTER_USER='repl',
MASTER_PASSWORD='123456';
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.12
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000017
Read_Master_Log_Pos: 299
Relay_Log_File: relaylog.000002
Relay_Log_Pos: 280
Relay_Master_Log_File: binlog.000017
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
7.启动管理节点
/u01/mha/etc/masterha_manager --conf=/u01/mha/etc/app.cnf &
/u01/mha/etc/masterha_manager --conf=/u01/mha/etc/app.cnf --remove_dead_master_conf --ignore_last_failover
#################配置文件###################
vim /u01/mha/etc/app.cnf
[server default]
user = root
password = root123
ssh_user = root
repl_user = rep
repl_password = 123456
ping_interval = 1
ping_type = SELECT
manager_workdir=/u01/mha/etc/app
manager_log=/u01/mha/log/manager.log
remote_workdir=/u01/mha/etc/app
master_binlog_dir="/u01/my3306/log/binlog"
master_ip_failover_script="/u01/mha/etc/master_ip_failover"
master_ip_online_change_script="/u01/mha/etc/master_ip_failover"
shutdown_script=""
report_script=""
#check_repl_delay=0
[server1]
hostname=mydb1
port=3306
master_binlog_dir="/apps/dbdat/mysql5_data3306/log"
candidate_master=1
ignore_fail=1
[server2]
hostname=mydb2
port=3306
master_binlog_dir="/u01/my3306/log/binlog"
candidate_master=1
ignore_fail=1
---------------------------------------------------------------------------------
vim /u01/mha/etc/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 = '192.168.0.201/24'; # Virtual IP
my $key = "1";
my $int = "eth0";
my $ssh_start_vip = "/sbin/ifconfig $int:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig $int:$key down";
my $arp_effect = "/sbin/arping -Uq -s192.168.0.201 -I $int 192.168.0.1 -c 3"; # Virtual IP and gat
eway
#my $test = "echo successfull >/tmp/test.txt";
$ssh_user = "root";
GetOptions(
'command=s' => \$command,
'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$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\@cluster1 \" $ssh_start_vip \"`;
&status();
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 \"`;
`ssh $ssh_user\@$new_master_host \" $arp_effect \"`;
# `ssh $ssh_user\@$new_master_host \" $test \"`;
}
# 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 status() {
print `ssh $ssh_user\@$orig_master_host \" ip add show $int \"`;
}
sub usage {
"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_maste
r_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}
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