nginx+keepalived+tomcat做web负债均衡高可用

1. tomcat1-2:
   yum install tomcat -y
   java -version

2. nginx1-2:
   yum install nginx keepalived -y

3. nginx1(keepalived):
   vim /etc/keepalived/keepalved.conf

            vrrp_script check_nginx

   {
   script "/etc/keepalived/check_nginx.sh"
   interval 2
   weight 5
   user root

}
vrrp_instance VI_1 {
state MASTER
interface eth0
mcast_src_ip 10.110.200.201
virtual_router_id 51
preempt
priority 120
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}

track_script {
check_nginx
}
virtual_ipaddress {
10.110.200.200
}
}

vim /etc/keepalived/check_nginx.sh

#!/bin/bash
count=0
for (( k=0; k<2; k++ ))
do
check_code=$( curl --connect-timeout 3 -sL -w "%{http_code}\n" http://localhost -o /dev/null )
if [ "$check_code" != "200" ]; then
count=count+1
continue
echo $count
else
count=0
break
echo "break"
fi
done
if [ "$count" != "0" ]; then
systemctl stop keepalived
echo "keepalived is stoped"
exit 1
else
exit 0
fi
或者：
#!/bin/bash

check_code=curl -o /dev/null -s -m 10 --connect-timeout 10 -w"%{http_code}" "localhost"
if [ "$check_code" != 200 ];then
systemctl stop keepalived
break
else
break
fi

4. nginx2(keepalived):
   vim /etc/keepalived/keepalved.conf

            vrrp_script check_nginx

   {
   script "/etc/keepalived/check_nginx.sh"
   interval 2
   weight -5
   user root
   enable_script_security
   }
   vrrp_instance VI_1 {
   state BACKUP
   interface eth0
   mcast_src_ip 10.110.200.202
   virtual_router_id 51
   preempt
   priority 120
   advert_int 1
   authentication {
   auth_type PASS
   auth_pass 1111
   }

track_script {
check_nginx
}
virtual_ipaddress {
10.110.200.200
}
}

vim /etc/keepalived/check_nginx.sh

#!/bin/bash
count=0
for (( k=0; k<2; k++ ))
do
check_code=$( curl --connect-timeout 3 -sL -w "%{http_code}\n" http://localhost -o /dev/null )
if [ "$check_code" != "200" ]; then
count=count+1
continue
echo $count
else
count=0
break
echo "break"
fi
done
if [ "$count" != "0" ]; then
systemctl stop keepalived
echo "keepalived is stoped"
exit 1
else
exit 0
fi

nginx+keepalived+tomcat做web负债均衡高可用

原文：https://blog.51cto.com/hzcto/2387174