centos7安装keepalived问题

● 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注意事项：

环境

主nginx负载均衡器：192.168.5.129 (通过keepalived配置了VIP：192.168.5.101/0供外使用)
副nginx负载均衡器：192.168.5.130(通过keepalived配置了VIP：192.168.5.101/0供外使用)

1.安装 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

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

keepalived默认会读取/etc/keepalived/keepalived.conf配置文件
> mkdir /etc/keepalived
> cp /keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

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

复制启动脚本到/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启动文件

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   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    -- 注意网卡名字
    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.启动与验证keepalievd  <ip addr list>

service keepalived start

systemctl status keepalived.service

  ps -aux|grep keepalived

 5. 遗留问题：

当服务启动后一段时间就自动关闭了服务；(大约几分钟后)

原因：并未设置监听服务，导致自动关闭服务

6. 设置centos7开机自动启动服务

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  重新加载

2:systemctl enable keepalived.service  设置开机自动启动

3:systemctl disable keepalived.service 取消开机自动启动

4:systemctl start keepalived.service 启动

5:systemctl stop keepalived.service停止

设置nginx开机自启动

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    启动nginx

systemctl stop nginx.service    结束nginx

systemctl restart nginx.service    重启nginx

7.配置监听文件

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

加入到作业计划
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 {
 acassen@firewall.loc
 failover@firewall.loc
 sysadmin@firewall.loc
 }
 notification_email_from Alexandre.Cassen@firewall.loc
 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 { ######执行监控nginx进程的脚本
 check_nginx
 }
 virtual_ipaddress {
 192.168.5.100
 }
}

 参考：​​用shell脚本监控进程是否存在 不存在则启动的实例​​

8.知识补充：学习shell编程

9. usr/bin 与 usr/local/bin 的区别

usr/bin 是系统自带的应用

usr/local/bin 是自己安装的应用和自己写的全局脚本