Kubernetes Cluster with docker-compose

you can run a local kubernetes cluster with a master and 4 nodes

Based on the great K3s Lightweight Kubernetes image

Made with love by Rancher Labs

Configuration

none!

USAGE

Start the master and set $KUBECONFIG for you

source start-cluster.sh

by default it will spawn 4 nodes if you want any other number let say 8

source start-cluster.sh 8

you can use the command above to size up or down the nodes

you'll get something like this at start-up

$ source ./start-cluster.sh 
SCALE: 4
starting server....
Building with native build. Learn about native build in Compose here: https://docs.docker.com/go/compose-native-build/
Recreating k3s_server_1 ... done
Recreating k3s_agent_1  ... done
Recreating k3s_agent_2  ... done
Recreating k3s_agent_3  ... done
Recreating k3s_agent_4  ... done

loading profile in KUBECONFIG AS: default
K3S_TOKEN=86731535528966
    Name           Command       State                    Ports                  
---------------------------------------------------------------------------------
k3s_agent_1    /bin/k3s agent    Up                                              
k3s_agent_2    /bin/k3s agent    Up                                              
k3s_agent_3    /bin/k3s agent    Up                                              
k3s_agent_4    /bin/k3s agent    Up                                              
k3s_server_1   /bin/k3s server   Up      0.0.0.0:6443->6443/tcp,:::6443->6443/tcp

Now you can use kubectl as in any other kubernetes cluster

 $ kubectl cluster-info
Kubernetes control plane is running at https://127.0.0.1:6443
CoreDNS is running at https://127.0.0.1:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
Metrics-server is running at https://127.0.0.1:6443/api/v1/namespaces/kube-system/services/https:metrics-server:/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

if you want persistent storage in your nodes

./storage-install.sh

Then you can start a echo test Application

 ./echo-install.sh 
deployment.apps/echo created
service/echo-service created
ingress.networking.k8s.io/echo-ingress created

Then you can open http://localhost/echo

If you want to start it all over again then:

./remove-cluster.sh

install kubernetes dashboard

./dashboard-install.sh

have fun!

Requirements

• Docker & docker-compose installed
• kubectl
• internet access

optionals:

• helm
• kubectx
• kubens
• k9s
• stern

Features

2 stages

source ./start-server.sh

see your master come up! then

source ./start-cluster.sh

will start the worker-nodes

get token: get a fresh token from registry

publish

Author

• 2019 - now : Borda Juan Ignacio

License

This code is distributed under the MIT license, see the LICENSE file.