IPVS on AWS EC2

IPVS on AWS EC2

ip_vs & ipvsadm

Note: ipvsadm is just the cli tools for interacting with the IP virtual server table in the kernel. 
"ip_vs" is the kernel module that does the actual connection manipulating.

ipvsadm command options:
Either long or short options are allowed.
  --add-service     		-A        add virtual service with options
  --edit-service    		-E        edit virtual service with options
  --add-server      		-a        add real server with options
  --edit-server     		-e        edit real server with options
  --tcp-service  		-t         service-address   service-address is host[:port]
  --udp-service  		-u        service-address   service-address is host[:port]


sudo yum install -y ipvsadm
sudo ipvsadm -l

mkdir /home/ec2-user/srv
mkdir /home/ec2-user/srv/A
mkdir /home/ec2-user/srv/B
echo "This is A" > /home/ec2-user/srv/A/index.html
echo "This is B" > /home/ec2-user/srv/B/index.html

sudo docker run --rm -d -v "/home/ec2-user/srv/A:/usr/share/nginx/html" --name nginx-a nginx
sudo docker run --rm -d -v "/home/ec2-user/srv/B:/usr/share/nginx/html" --name nginx-b nginx

sudo docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' nginx-a
172.17.0.2

sudo docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' nginx-b
172.17.0.3

curl 172.17.0.2
This is A

curl 172.17.0.3
This is B

sudo ipvsadm -A -t 172.31.20.35:80 -s rr
sudo ipvsadm -a -t 172.31.20.35:80 -r 172.17.0.2 -m
sudo ipvsadm -a -t 172.31.20.35:80 -r 172.17.0.3 -m
sudo ipvsadm -l -n

for i in {1..10}; do curl private-ip; done
This is B
This is A
This is B
This is A
This is B
This is A
This is B
This is A
This is B
This is A

http://public-ip/ this worked well in mozilla browser