centos7 install keepalived problem

● 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.

Precautions for building keepalived:

surroundings

Main nginx [load balance] (https://cloud.tencent.com/product/clb?from=10680) device: 192.168.5.129 (VIP is configured through keepalived: 192.168.5.101/0 for external use)
Deputy nginx load balancer: 192.168.5.130 (VIP is configured through keepalived: 192.168.5.101/0 for external use)

Install 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

Configure keepalived file

copy/sbin/keepalived to/usr/sbin
> cp /keepalived/sbin/keepalived /usr/sbin/

keepalived will read by default/etc/keepalived/keepalived.conf configuration file
> mkdir /etc/keepalived
> cp /keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

Copy the sysconfig file to/etc/under sysconfig
> cp /keepalived/etc/sysconfig/keepalived /etc/sysconfig/

Copy the startup script to/etc/init.under d
> cd /keepalived-1.3.4> cp ./keepalived/etc/init.d/keepalived /etc/init.d/> chmod 755/etc/init.d/keepalived

Configure keepalived.conf startup file

! Configuration File for keepalived

global_defs {
 notification_email {
  [email protected]
  [email protected]
  [email protected]
   }
 notification_email_from [email protected]
 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)interfaceens33--Pay attention to the network card name
 virtual_router_id 51
 priority 50
 advert_int 1
 authentication {
  auth_type PASS
  auth_pass 1111}
    
 virtual_ipaddress {192.168.5.100192.168.5.101}}

Start and verify keepalievd

service keepalived start

systemctl status keepalived.service

Remaining issues:

When the service is started, the service is automatically closed for a period of time; (about a few minutes later)

Set centos7 to start the service automatically

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 reload

2: systemctl enable keepalived.service set to start automatically

3: systemctl disable keepalived.service cancel automatic startup

4: systemctl start keepalived.service start

5: systemctl stop keepalived.service stop

Set nginx to start automatically

vim /lib/systemd/system/keepalived.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 start nginx

systemctl stop nginx.service ends nginx

systemctl restart nginx.service restart nginx

Configure listening file

vi /root/check_nginx.sh

#! /bin/bash
if[`ps -C nginx --no-header |wc -l`-eq 0]
 then
 systemctl start nginx.service
 sleep 2if[`ps -C nginx --no-header |wc -l`-eq 0]
   then
    systemctl stop keepalived.service
 fi
fi

chmod +x /root/check_nginx.sh

Add to job plan
crontab -e
* /1****/root/check_nginx.sh >>/root/check_nginx.log

Append keepalived.conf file

vrrp_script check_nginx {                   ######Define the script to monitor nginx
 script "/root/check_nginx.sh"
 interval 2                            ######Monitoring interval
 weight 2                              ######Load parameter
}

vrrp_instance vrrptest {
track_script {                       
 check_nginx
}

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