centos7安裝keepalived問題

● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled)
Active: failed (Result: resources) since Sat 2018-08-04 13:06:35 EDT; 16s ago
Process: 3435 ExecStart=/usr/local/keepalived/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Aug 04 13:06:35 localhost.localdomain systemd[1]: Starting LVS and VRRP High Availability Monitor...
Aug 04 13:06:35 localhost.localdomain systemd[1]: PID file /var/run/keepalived.pid not readable (yet?) after start.
Aug 04 13:06:35 localhost.localdomain systemd[1]: Failed to start LVS and VRRP High Availability Monitor.
Aug 04 13:06:35 localhost.localdomain systemd[1]: Unit keepalived.service entered failed state.
Aug 04 13:06:35 localhost.localdomain systemd[1]: keepalived.service failed.

 

搭建keepalived注意事項：

環境

主nginx負載均衡器：192.168.5.129 （通過keepalived配置了VIP：192.168.5.101/0供外使用）
副nginx負載均衡器：192.168.5.130（通過keepalived配置了VIP：192.168.5.101/0供外使用）

1.安裝 keepalived-1.4.1

 tar xf keepalived-1.3.4.tar.gz
 cd keepalived-1.3.4
 ./configure --prefix=/usr/local/keepalived
 make && make install

2.配置keepalived文件

復制/sbin/keepalived到/usr/sbin下
> cp /keepalived/sbin/keepalived /usr/sbin/

keepalived默認會讀取/etc/keepalived/keepalived.conf配置文件
> mkdir /etc/keepalived
> cp /keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

復制sysconfig文件到/etc/sysconfig下
> cp /keepalived/etc/sysconfig/keepalived /etc/sysconfig/

復制啟動腳本到/etc/init.d下
> cd /keepalived-1.3.4
> cp ./keepalived/etc/init.d/keepalived /etc/init.d/
> chmod 755 /etc/init.d/keepalived
　　

 

3.配置keepalived.conf啟動文件

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER(BACKUP)
    interface ens33    -- 注意網卡名字
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    
    virtual_ipaddress {
        192.168.5.100
        192.168.5.101
    }
}

 

 

4.啟動與驗證keepalievd  <ip addr list>

service keepalived start

systemctl status keepalived.service

  ps -aux|grep keepalived

 

 

 5. 遺留問題：

當服務啟動后一段時間就自動關閉了服務；（大約幾分鍾后）

 

原因：並未設置監聽服務，導致自動關閉服務

6. 設置centos7開機自動啟動服務

vim /lib/systemd/system/keepalived.service

[Unit]
Description=Keepalived
After=syslog.target network.target remote-fs.target nss-lookup.target
 
[Service]
Type=forking
PIDFile=/var/run/keepalived.pid
ExecStart=/usr/local/keepalived/sbin/keepalived -D
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
PrivateTmp=true
 
[Install]
WantedBy=multi-user.target

 

1;systemctl daemon-reload  重新加載

2:systemctl enable keepalived.service  設置開機自動啟動

3:systemctl disable keepalived.service 取消開機自動啟動

4:systemctl start keepalived.service 啟動

5:systemctl stop keepalived.service停止

　　

設置nginx開機自啟動

vim /lib/systemd/system/nginx.service

[Unit]
Description=nginx 
After=network.target 
   
[Service] 
Type=forking 
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx reload
ExecStop=/usr/local/nginx/sbin/nginx quit
PrivateTmp=true 
   
[Install] 
WantedBy=multi-user.target

systemctl enable nginx.service

systemctl start nginx.service    啟動nginx

systemctl stop nginx.service    結束nginx

systemctl restart nginx.service    重啟nginx

 

7.配置監聽文件

vi /root/check_nginx.sh

#!/bin/sh
count=`ps aux | grep nginx | grep -v grep | wc -l`
if [ $count -eq 0 ]
then
　　echo "running....., please starting...."
　　systemctl start nginx.service
　　sleep 2
else
　　echo "running...."
fi

chmod +x /root/check_nginx.sh

　　

加入到作業計划
crontab -e
*/1 * * * * /root/check_nginx.sh >>/root/check_nginx.log

追加keepalived.conf文件

! Configuration File for keepalived

global_defs {
notification_email {
[e-mail]
[e-mail]
[e-mail]
}
notification_email_from [e-mail]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}

vrrp_script check_nginx {
script "/root/check_nginx.sh"
interval 2
weight 2
}

vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
mcast_src_ip 192.168.5.129
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 111111
}

track_script { ######執行監控nginx進程的腳本
check_nginx
}
virtual_ipaddress {
192.168.5.100
}
}

 參考：用shell腳本監控進程是否存在 不存在則啟動的實例

8.知識補充：學習shell編程

 

9. usr/bin 與 usr/local/bin 的區別

usr/bin 是系統自帶的應用

usr/local/bin 是自己安裝的應用和自己寫的全局腳本