Docker & Kubernetes: Multi-node Local Kubernetes cluster - Kubeadm-dind(docker-in-docker)

This post is based on kubeadm-dind-cluster. Might be better off follow the directions of the Readme on that repository.

Found the "dind ("docker in docker") while looking for a local alternative to EKS. Though AWS provides us Quick Start for Kubernetes by VMware on the AWS Cloud, it's not free.

Kubeadm-dind is a multi-node (while minikube is single-node) Kubernetes cluster which only requires a docker daemon. It uses docker-in-docker technique to spawn the Kubernetes cluster.

For more on Kubernetes solutions: https://kubernetes.io/docs/setup/pick-right-solution/#custom-solutions

We can start Kubernetes 1.13 as follows:

$ wget https://github.com/kubernetes-sigs/kubeadm-dind-cluster/releases/download/v0.1.0/dind-cluster-v1.13.sh

$ chmod +x dind-cluster-v1.13.sh

$ # start the cluster
$ ./dind-cluster-v1.13.sh up

$ # add kubectl directory to PATH
$ export PATH="$HOME/.kubeadm-dind-cluster:$PATH"
...
kube-proxy and the nodes 
....[done]
* Bringing up coredns and kubernetes-dashboard 
deployment.extensions/coredns scaled
deployment.extensions/kubernetes-dashboard scaled
................[done]
NAME          STATUS    ROLES     AGE       VERSION
kube-master   Ready     master    3m7s      v1.13.0
kube-node-1   Ready     <none>    100s      v1.13.0
kube-node-2   Ready     <none>    98s       v1.13.0
* Access dashboard at: http://127.0.0.1:32768/api/v1/namespaces/kube-system/services/kubernetes-dashboard:/proxy

If got an error, "./dind-cluster-v1.13.sh: line 802: sha1sum: command not found", just run the script again after setting up the new PATH.

We can check the locally available context:

$ kubectl config get-contexts
CURRENT   NAME       CLUSTER    AUTHINFO   NAMESPACE
*         dind       dind                  
          minikube   minikube   minikube   

The nodes are ready for use:

$ kubectl get nodes
NAME          STATUS    ROLES     AGE       VERSION   INTERNAL-IP   EXTERNAL-IP   OS-IMAGE                       KERNEL-VERSION     CONTAINER-RUNTIME
kube-master   Ready     master    15m      v1.13.0   10.192.0.2    <none>        Debian GNU/Linux 9 (stretch)   4.9.125-linuxkit   docker://18.9.0
kube-node-1   Ready     <none>    14m      v1.13.0   10.192.0.3    <none>        Debian GNU/Linux 9 (stretch)   4.9.125-linuxkit   docker://18.9.0
kube-node-2   Ready     <none>    14m      v1.13.0   10.192.0.4    <none>        Debian GNU/Linux 9 (stretch)   4.9.125-linuxkit   docker://18.9.0

We can see containers are running:

$ docker ps
CONTAINER ID        IMAGE                                                                          COMMAND                  CREATED             STATUS              PORTS                       NAMES
18115fa26c03        mirantis/kubeadm-dind-cluster:596f7d093470c1dc3a3e4466bcdfb34438a99b90-v1.13   "/sbin/dind_init sys…"   21 minutes ago      Up 21 minutes       8080/tcp                    kube-node-2
1166d83520c1        mirantis/kubeadm-dind-cluster:596f7d093470c1dc3a3e4466bcdfb34438a99b90-v1.13   "/sbin/dind_init sys…"   21 minutes ago      Up 21 minutes       8080/tcp                    kube-node-1
a584c8fe9e05        mirantis/kubeadm-dind-cluster:596f7d093470c1dc3a3e4466bcdfb34438a99b90-v1.13   "/sbin/dind_init sys…"   21 minutes ago      Up 21 minutes       127.0.0.1:32769->8080/tcp   kube-master

Using the port from the output of ./dind-cluster-v1.13.sh up, we can see k8s dashboard at "http://localhost:port/api/v1/namespaces/kube-system/services/kubernetes-dashboard:/proxy":

Cluster up/down/teardown:

# restart the cluster, this should happen much quicker than initial startup
$ ./dind-cluster-v1.13.sh up
* Making sure DIND image is up to date 
sha256:0fcb655948a1fa20f5a2100983755edc8f0d763248bda217b3454d82d5cd3be4: Pulling from mirantis/kubeadm-dind-cluster
Digest: sha256:0fcb655948a1fa20f5a2100983755edc8f0d763248bda217b3454d82d5cd3be4
Status: Image is up to date for mirantis/kubeadm-dind-cluster@sha256:0fcb655948a1fa20f5a2100983755edc8f0d763248bda217b3454d82d5cd3be4
* Restoring containers 
* Restoring master container 
* Restoring node container: 1
* Restoring node container: 2
* Starting DIND container: kube-node-2
* Starting DIND container: kube-node-1
* Starting DIND container: kube-master
* Node container restored: 1
* Node container restored: 2
* Master container restored 
Creating static routes for bridge/PTP plugin
* Setting cluster config 
Cluster "dind" set.
Context "dind" modified.
Switched to context "dind".
* Waiting for kube-proxy and the nodes 
.......[done]
* Bringing up coredns and kubernetes-dashboard 
deployment.extensions/coredns scaled
deployment.extensions/kubernetes-dashboard scaled
..........................[done]
NAME          STATUS    ROLES     AGE       VERSION
kube-master   Ready     master    14h       v1.13.0
kube-node-1   Ready     <none>    14h       v1.13.0
kube-node-2   Ready     <none>    14h       v1.13.0
* Access dashboard at: http://127.0.0.1:32769/api/v1/namespaces/kube-system/services/kubernetes-dashboard:/proxy

# stop the cluster
$ ./dind-cluster-v1.13.sh down
* Removing container: f5ccf609a243f5ccf609a243
* Removing container: 13f8382cdd7713f8382cdd77
* Removing container: a62ca7dab7fda62ca7dab7fd

# remove DIND containers and volumes
$ ./dind-cluster-v1.13.sh clean

1. kubeadm-dind-cluster
2. Quick Start for Kubernetes by VMware on the AWS Cloud

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