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Nitrox for Docker Swarm

You can run Nitrox as a container or as a regular python script.

Usage

Pre-requisites

  1. Docker Swarm Cluster. Instructions assume you are running on the Swarm Manager/Master
  2. NetScaler pre-requisites are here
  3. An appkey that will be used to label the containers that comprise the apps/microservices. For example, com.citrix.lb.appname

As a container

Launch the 'nitrox' container

The code has been containerized into chiradeeptest/nitrox . Use this container from the swarm master:

[root@swarm-master ~]# eval "$(docker-machine env --swarm swarm-master)"
[root@swarm-master ~]# docker run \
           -e NS_IP=$NS_IP \
           -e NS_USER=$NS_USER \
           -e NS_PASSWORD=$NS_PASSWORD \
           -e APP_INFO='{"appkey": "com.citrix.lb.appname", "apps": [{"name": "AccountService"}, {"name": "ProductCatalog"}, {"name":"ShoppingCart"}, {"name":"OrderServer"}]}' \
           -d \
           -v /etc/docker:/etc/docker \
           --name nitrox \
           chiradeeptest/nitrox \
           --swarm-url=$DOCKER_HOST \
           --swarm-tls-ca-cert=/etc/docker/ca.pem \
           --swarm-tls-cert=/etc/docker/server.pem \
           --swarm-tls-key=/etc/docker/server-key.pem

Monitor the logs of the containers with docker logs nitrox

Test

Run some containers and see your NetScaler get reconfigured

for i in 0 1 2 3 4 
do
	   docker run -d -l com.citrix.lb.appname=AccountService --name AccountService$i -p 800$i:80 nginx
done

Kill a few container instances:

docker stop AccountService0
docker start AccountService0

Logs:

2015-12-01 00:55:37,045  - DEBUG - [docker_swarm.py:watch_app ]  (Thread-1) Event status: die, id: 97df5d1fa1d0 2015-12-01 00:55:37,048  - INFO - [docker_swarm.py:watch_app ]  (Thread-1) Configuring NS for app AccountService,container id=97df5d1fa1d0
2015-12-01 00:55:37,048  - INFO - [docker_swarm.py:get_backends_for_app]  (Thread-1) Getting backends for app label com.citrix.lb.appname=AccountService
2015-12-01 00:55:37,051  - DEBUG - [docker_swarm.py:configure_ns_for_app]  (Thread-1) Backends are [(u'10.71.137.30', 8004), (u'10.71.137.7', 8003), (u'10.71.137.38', 8002), (u'10.71.137.30', 8001)]
2015-12-01 00:55:37,129  - INFO - [netscaler.py:_create_service_group]  (Thread-1) Service group AccountService already configured 
2015-12-01 00:55:37,182  - INFO - [netscaler.py:_bind_service_group_lb]  (Thread-1) LB AccountService is already bound to service group AccountService
2015-12-01 00:55:37,240  - INFO - [netscaler.py:_configure_services]  (Thread-1) Unbinding 10.71.137.38:8000 from service group AccountService
2015-12-01 00:55:37,279  - INFO - [netscaler.py:_configure_services]  (Thread-1) 10.71.137.30:8002 is already bound to  service group AccountService
2015-12-01 00:55:37,279  - INFO - [netscaler.py:_configure_services]  (Thread-1) 10.71.137.38:8001 is already bound to  service group AccountService
2015-12-01 00:55:37,279  - INFO - [netscaler.py:_configure_services]  (Thread-1) 10.71.137.7:8004 is already bound to  service group AccountService

For developers / hackers

Download and install the Citrix NetScaler SDK for Python:

wget http://downloadns.citrix.com.edgesuite.net/11872/ns-11.0-65.31-sdk.tar.gz
tar xzf ns-11.0-65.31-sdk.tar.gz
tar xzvf ns-11.0-65.31-nitro-python.tgz 
cd nitro-python-1.0/
sudo python setup.py install

Install the docker python client

sudo pip install docker-py

Get the code:

git clone https://github.com/chiradeep/nitrox.git
cd nitrox

Run the code while pointing it to the Docker Swarm environment. (This assumes you are running on the Docker Swarm manager)

eval "$(docker-machine env --swarm swarm-master)"
python main.py  --swarm-url=$DOCKER_HOST --swarm-tls-ca-cert=$DOCKER_CERT_PATH/ca.pem --swarm-tls-cert=$DOCKER_CERT_PATH/cert.pem --swarm-tls-key=$DOCKER_CERT_PATH/key.pem

Containers instances for each app backend have to be started with a label of the form label=app_key=app_name. For instance

for i in 0 1 2 3 4 5
do
   docker run -d -l com.citrix.lb.appname=foo --name www$i -p 80$i:80 nginx
done

Try changing the state of a few containers:

docker stop www0 
docker start www0

The Netscaler will get reconfigured by removing the container from the load balancer service group (docker stop) or with the new location/port of the container (docker run).