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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，接下来就让丸趣 TV 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
}
“MHA 的安装和部署步骤”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注丸趣 TV 网站，丸趣 TV 小编将为大家输出更多高质量的实用文章！
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