DockerGDL kubernetes & Docker

# http://sebgoa.blogspot.mx/2015/04/1-command-to-kubernetes-with-docker.html

# You need to have docker installed on one machine.

# check for docker compose installation if not install it with
curl -L https://github.com/docker/compose/releases/download/1.2.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

# check for correct installation with
docker-compose version

#create the yaml fiel to be used to raise the kubernetes server, named as k8s.yml
# see the yaml included
# set the version of kubernetes of use (for these demo 0.17.0)
export K8S_VERSION=0.17.0

# And now, 1 command, in the same directory where is the k8s.yml file

docker-compose -f k8s.yml up -d

# check docker ps for the components of kubernetes
docker ps

# at this point you should have a running kubernetes cluster
# to test the cluster we need the client/cli -> kubctl
wget http://storage.googleapis.com/kubernetes-release/release/v${K8S_VERSION}/bin/linux/amd64/kubectl
chmod 755 kubectl
PATH=$PATH:`pwd`


# test by listing the nodes running in the cluster
kubectl get nodes

# running an app 
kubectl run-container nginx --image=nginx --port=80

# check for the pod where you new container app was grouped
# also you will see the pod for kubernetes (yeah kubernetes managed by kubernetes)
kubectl get pods

#check for the replication controller (rc)
kubectl get rc

# you can have some fun resize capability and see how a new container pop-up
kubectl resize --replicas=2 rc nginx

# Expose it as a service
kubectl expose rc nginx --port=80 --public-ip=the_instance_public_IP

# now go to http://the_instance_public_IP


# at the very very end
docker-compose -f k8s.yml stop

# kill them all 
docker kill $(docker ps -aq)

k8s.yml

etcd:
  image: kubernetes/etcd:2.0.5.1
  net: "host"
  command: /usr/local/bin/etcd --addr=127.0.0.1:4001 --bind-addr=0.0.0.0:4001 --data-dir=/var/etcd/data
master:
  image: gcr.io/google_containers/hyperkube:v0.17.0
  net: "host"
  volumes:
    - /var/run/docker.sock:/var/run/docker.sock
  command: /hyperkube kubelet --api_servers=http://localhost:8080 --v=2 --address=0.0.0.0 --enable_server --hostname_override=127.0.0.1 --config=/etc/kubernetes/manifests
proxy:
  image: gcr.io/google_containers/hyperkube:v0.17.0
  net: "host"
  privileged: true
  command: /hyperkube proxy --master=http://127.0.0.1:8080 --v=2