rukavina / ansible-docker-experiment

ansible-docker-experiment

There are 3 machines:

• lb - load balancer 10.100.193.200
• app-01 - app server 1 10.100.194.201
• app-02 - app server 2 10.100.194.202

        /- app-01 (apache+php/docker)
lb(nginx/docker)
        \_ app-02 (apache+php/docker)

registrator and consul runs on all nodes. registrator "watches" docker system and registers services info in consul db. consul-template on lb node, generates proxy rules based on consul data and templates.

provision nodes

vagrant up
ansible-playbook ansible/app.yml -i ansible/hosts/app
#haproxy version
ansible-playbook ansible/lb-haproxy.yml -i ansible/hosts/lb

#or nginx version
ansible-playbook ansible/lb-nginx.yml -i ansible/hosts/lb

test service registry

vagrant ssh lb
curl 127.0.0.1:8500/v1/catalog/nodes
curl 127.0.0.1:8500/v1/catalog/services
curl 127.0.0.1:8500/v1/catalog/service/php1
curl 127.0.0.1:8500/v1/catalog/service/php2

manual nginx template generation

consul-template roles runs bg process which watches consul and automatically updates config and reload proxy container. So there's no need to generate files manually, but this just describes the process.

vagrant ssh lb

consul-template -template "/data/consul-template/nginx_locations_php_api.ctmpl:/tmp/locations_php_api.conf" -once
consul-template -template "/data/consul-template/nginx_upstreams_php_api.ctmpl:/tmp/upstreams_php_api.conf" -once

cp /tmp/locations_php_api.conf /data/nginx/includes/
cp /tmp/upstreams_php_api.conf /data/nginx/upstreams/

sudo docker kill -s HUP nginx

or

bash /data/consul-template/regenerate-nginx-config.sh
sudo docker kill -s HUP nginx

haproxy template generation

consul-template roles runs bg process which watches consul and automatically updates config and reload proxy container. So there's no need to generate files manually, but this just describes the process.

vagrant ssh lb

#stop nginx container if running
sudo docker ps
sudo docker stop nginx

#generate config for running services
bash /data/consul-template/regenerate-haproxy-config.sh

#initial start
sudo docker restart haproxy

#while running
sudo docker kill -s HUP haproxy

test calls

from front-end:

For now this works only with nGinx!

in the host machine add to /etc/hosts the line:

127.0.0.1  api.horisen.test front1.horisen.test content.horisen.test

Now open in browser http://front1.horisen.test:8081/ where you should see debug info with server used and headers. Click on the button and watch the console, you should see api response json.

from host machine:

curl http://127.0.0.1:8081/php1
curl http://127.0.0.1:8081/php2

from lb

curl http://127.0.0.1/php1
curl http://127.0.0.1/php2

from app

to get ports run curl 127.0.0.1:8500/v1/catalog/service/php1 and curl 127.0.0.1:8500/v1/catalog/service/php2

curl http://127.0.0.1:{port1}/php1
curl http://127.0.0.1:{port2}/php2