this is demo of traffic management with open resty, Consul, and registrator

0 Create machines (if necessary)

docker-machine create -d virtualbox default docker-machine create -d virtualbox host1 docker-machine create -d virtualbox host2 docker-machine create -d virtualbox host3

1 Start machines

docker-machine start default docker-machine start host1 docker-machine start host2 docker-machine start host3

NAME      ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER    ERRORS
default   -        virtualbox   Running   tcp://192.168.99.100:2376           v1.12.1   
host1     -        virtualbox   Running   tcp://192.168.99.101:2376           v1.12.1   
host2     -        virtualbox   Running   tcp://192.168.99.102:2376           v1.12.1
host3     -        virtualbox   Running   tcp://192.168.99.103:2376           v1.12.1

(regenerate certs if necessary docker-machine regenerate-certs default host1 host2 host3 )

1.1 Build parts

cd base-resty; ./build-base-image.sh; cd -

cd api-gateway; ./build-gateway-image.sh; cd -

2 Start Consul

eval $(docker-machine env host3)

docker run --rm -p 8400:8400 -p 8500:8500 consul agent -datacenter=kgi -server -client=0.0.0.0 -bootstrap -ui

3 Start Registrator on machines host1 and host2

http://gliderlabs.com/registrator/latest/

./deploy-registrator.sh 1 ./deploy-registrator.sh 2

at this time we can see that consul console show only consul service at http://192.168.99.103:8500

4 Deploy echo service on one or 2 hosts

./deploy-echo-service.sh host1 ./deploy-echo-service.sh host2

http://192.168.99.103:8500/ui/#/vbtdev/services now show one or two instances available

4 Start Nginx on a gateway host

Consul UI http://192.168.99.103:8500

Consul API http://192.168.99.103:8500/v1/catalog/services

Echo-service call http://192.168.99.100:8000/api/echo-service/headers

we can manage registration info by simply specifying different environment variables docker run --rm -P
-e "SERVICE_NAME=echo-service-test"
-e "SERVICE_TAGS=http,v1-candidate"
echo-service

docker-machine stop host3 host2 host1 default

Useful Links

https://blog.uship.com/shippingcode/connectivity-between-nginx-and-consul-template/

http://blog.cloud66.com/9-crtitical-decisions-needed-to-run-docker-in-production/

https://www.consul.io/

https://github.com/hashicorp/consul-template

https://openresty.org/en/

https://github.com/hashicorp/envconsul

https://studio.zerobrane.com/ Debugging Lua on nginx server http://notebook.kulchenko.com/zerobrane/debugging-openresty-nginx-lua-scripts-with-zerobrane-studio

Register a service manually

curl -X PUT 192.168.99.104:8500/v1/catalog/register
--data @register-service.json