MySQL 部署 MHA 高可用架构 (二)
实现 MHA VIP 功能
配置 master_ip_failover 脚本(db3)
把 master_ip_failover 上传到 /iba/software 上
master_ip_failover 文件内容
``` #!/usr/bin/env perluse 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 = '192.168.31.88/24';
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$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";
}
</details>
cd /iba/software/
cp /iba/software/master_ip_failover /usr/local/bin/
修改脚本参数，改为自己的VIP，网卡设备
vi /usr/local/bin/master_ip_failover
my $vip = '192.168.31.88/24';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
修改 mha 配置
vi /etc/mha/app1.cnf
在 [server default] 下添加
master_ip_failover_script=/usr/local/bin/master_ip_failover
yum install dos2unix -y
dos2unix /usr/local/bin/master_ip_failover
chmod +x /usr/local/bin/master_ip_failover
### 在主库上手工生成第一个vip地址
ifconfig eth0:1 192.168.31.88/24
手动停止网卡的方法：ifconfig eth0:1 down
### 重启 MHA manager 使配置生效(db3)
masterha_stop --conf=/etc/mha/app1.cnf
nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null> /var/log/mha/app1/manager.log 2>&1 &
tail -f /var/log/mha/app1/manager.log
### 测试
停止主库
systemctl stop mysqld
查看 ip, 发现 vip 已经飘走
ip add
在 db3 上执行
masterha_check_repl --conf=/etc/mha/app1.cnf
结果显示 主库现在为 db1 ，经查看，vip 成功切换到 db1 上。
## 实现邮件报警
### 编写发邮件脚本(db3)
在 [server default] 下添加
vi /etc/mha/app1.cnf
report_script=/usr/local/bin/send_report
### 文件/usr/local/bin/send_report 内容
!/usr/bin/python
-- coding: UTF-8 --
import smtplib
from email.mime.text import MIMEText
from email.header import Header
第三方 SMTP 服务
mail_host="smtp.126.com" #设置服务器
mail_user="xxxxx@126.com" #用户名
mail_pass="xxxxx" #口令
sender = 'xxxxx@126.com'
receivers = 'yyyyyy@qq.com' # 接收邮件，可设置为你的QQ邮箱或者其他邮箱
message = MIMEText('MHA master 已经切换, 请查看', 'plain', 'utf-8')
message['From'] = sender
message['To'] = receivers
subject = 'MySQL MHA 邮件'
message['Subject'] = Header(subject, 'utf-8')
try:
smtpObj = smtplib.SMTP()
smtpObj.connect(mail_host, 25) # 25 为 SMTP 端口号
smtpObj.login(mail_user,mail_pass)
smtpObj.sendmail(sender, receivers, message.as_string())
print "邮件发送成功"
except smtplib.SMTPException, e:
print "Error:", evi /usr/local/bin/send_report
### 添加执行权限
chmod + x /usr/local/bin/send_report
### 重启 mha
masterha_stop --conf=/etc/mha/app1.cnf
nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null> /var/log/mha/app1/manager.log 2>&1 &
### MySQL 主库 down 时，切换成功发送邮件
### 邮件发送成功