gitlab+keepalived

1. 192.168.1.247 节点01

　　1.1 安装keepalived01

　　```bash
　　root@ubuntu-server03:~# apt-cache search keepalived
　　keepalived - Failover and monitoring daemon for LVS clusters
　　root@ubuntu-server03:~# apt-cache policy keepalived
　　keepalived:
　　　　已安装： 1:1.2.7-1ubuntu1
　　　　候选软件包：1:1.2.7-1ubuntu1
　　　　版本列表：
　　　　　　1:1.2.13-1~ubuntu14.04.1 0
　　　　　　100 http://mirrors.163.com/ubuntu/ trusty-backports/main amd64 Packages
　　　　*** 1:1.2.7-1ubuntu1 0
　　　　　　500 http://mirrors.163.com/ubuntu/ trusty/main amd64 Packages
　　　　　　100 /var/lib/dpkg/status
　　　　root@ubuntu-server03:~# apt-get install -y keepalived
　　　　root@ubuntu-server03:~# dpkg -l | grep keepalived
　　　　ii keepalived 1:1.2.7-1ubuntu1 amd64 Failover and monitoring daemon for LVS clusters
　　　　```

1.2 配置keepalived01

　　```bash
　　root@ubuntu-server03:~# cat /etc/keepalived/keepalived.conf
　　global_defs { #自由定义
　　notification_email {
　　xxxxx@mail.com
　　　　}
　　notification_email_from keepalived@chtopnet.com
　　smtp_server 127.0.0.1
　　smtp_connect_timeout 30
　　router_id 51
　　　　}

　　vrrp_script chk_gitlab {
　　script "/etc/keepalived/check_gitlab.sh" #定义一个监测脚本
　　interval 2 #脚本执行频率（单位:s）
　　　　}

　　vrrp_script check_mysqld {
　　script "/etc/keepalived/check_mysql.sh" #定义一个监测脚本
　　interval 2
　　　　}

　　vrrp_instance VI_1 {
　　state BACKUP #两个主机都写BACKUP即可
　　nopreempt #非抢占模式，只需要在主设置即可
　　interface em1 #绑定的网卡
　　virtual_router_id 51 #两个主机id一致
　　mcast_src_ip 192.168.1.247 #vrrp实体服务器的IP
　　priority 100 #权重高于另一个即可
　　advert_int 1
　　authentication {
　　auth_type PASS #验证方式
　　auth_pass chtopnet
　　　　}
　　virtual_ipaddress {
　　192.168.1.245/24 #虚拟IP　　
　　　　}
　　track_script {
　　check_mysqld #应用监测脚本
　　chk_gitlab
　　　　}
　　}
　　root@ubuntu-server03:~# service keepalived restat
　　```

2. 192.168.1.248 节点02

　 2.1 安装keepalived02

　安装步骤和keepalived01 一样

　2.3 配置keepalived02

　```bash
　root@ubuntu-server04:~# cat /etc/keepalived/keepalived.conf
　global_defs {
　notification_email {
　xxxxx@mail.com
　}

　notification_email_from keepalived@chtopnet.com
　smtp_server 127.0.0.1
　smtp_connect_timeout 30
　router_id 51
　}

　vrrp_script chk_gitlab {
　script "/etc/keepalived/check_gitlab.sh"
　interval 2
　}
　vrrp_script check_mysqld {
　script "/etc/keepalived/check_mysql.sh"
　interval 2
　}

　vrrp_instance VI_1 {
　state BACKUP
　interface em1
　virtual_router_id 51
　mcast_src_ip 192.168.1.248
　priority 99
　advert_int 1
　authentication {
　auth_type PASS
　auth_pass chtopnet
　}
　virtual_ipaddress {
　192.168.1.245/24
　}
　track_script {
　check_mysqld
　chk_gitlab
　}
}
root@ubuntu-server04:~# service keepalived restat
```

3. 监测脚本

check\_gitlab.sh

```bash
root@ubuntu-server03:~# cat /etc/keepalived/check_gitlab.sh
#!/bin/bash

container_state=`docker ps -a | grep gitlabnew_boxfish-gitlab | awk '{print $1}' | xargs docker inspect --format='{{.State.Status}}'`

if [ ${container_state} = "running" ]; then
　　exit 0
else
　　exit 1
fi
```

check\_gitlab.sh

```bash
root@ubuntu-server04:~# cat /etc/keepalived/check_mysql.sh
#!/bin/bash
Mysqlbin=/usr/bin/mysql
user=root
pw='boxfish123'
port=3306
host=127.0.0.1
sbm=120

#Check for $Mysqlbin
if [ ! -f $Mysqlbin ];then
　　echo 'Mysqlbin not found,check the variable Mysqlbin'
　　exit 99
fi

#Get Mysql Slave Status
IOThread=`$Mysqlbin -h $host -P $port -u$user -p$pw -e 'show slave status\G' 2>/dev/null|grep 'Slave_IO_Running:'|awk '{print $NF}'`
SQLThread=`$Mysqlbin -h $host -P $port -u$user -p$pw -e 'show slave status\G' 2>/dev/null|grep 'Slave_SQL_Running:'|awk '{print $NF}'`
SBM=`$Mysqlbin -h $host -P $port -u$user -p$pw -e 'show slave status\G' 2>/dev/null|grep 'Seconds_Behind_Master:'|awk '{print $NF}'`

#Check if the mysql run
if [[ -z "$IOThread" ]];then
　　exit 1
fi

#Check if the thread run
if [[ "$IOThread" = "No" || "$SQLThread" = "No" ]];then
　　exit 1
elif [[ $SBM -ge $sbm ]];then
　　exit 1
else
　　exit 0
fi
```