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Docker Machine - Kubernetes Minikube
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machine-minikube.md

Docker Machine - Kubernetes Minikube

Using a machine to run minikube.

This sets up a single-node Kubernetes installation, using the regular Boot2Docker ISO.

Tested with minikube version: v0.22.3 (latest) and kubernetes version: v1.8.0 (release)

Written by Anders Björklund (@afbjorklund)

External URLs

Kubernetes

#KUBERNETES_VERSION=$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)
KUBERNETES_VERSION=v1.8.0

curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 && chmod +x minikube
curl -Lo localkube https://storage.googleapis.com/minikube/k8sReleases/$KUBERNETES_VERSION/localkube-linux-amd64 && chmod +x localkube
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/$KUBERNETES_VERSION/bin/linux/amd64/kubectl && chmod +x kubectl
  • 50M kubectl
  • 86M minikube
  • 149M localkube

Boot2Docker

# Boot2Docker ISO uses Tiny Core Linux 7.x
http://repo.tinycorelinux.net/7.x/x86_64/tcz/
  • 348K tcz/bash.tcz
  • 4.0K tcz/bash.tcz.dep
  • 4.0K tcz/bash.tcz.md5.txt
  • 196K tcz/ncurses.tcz
  • 4.0K tcz/ncurses.tcz.md5.txt
  • 124K tcz/readline.tcz
  • 4.0K tcz/readline.tcz.dep
  • 4.0K tcz/readline.tcz.md5.txt
  • 688K total

Creating the machine

docker-machine create default
#   --virtualbox-cpu-count "1"
#   --virtualbox-memory "1024"

Running pre-create checks...
Creating machine...
(default) Copying /home/anders/.docker/machine/cache/boot2docker.iso to /home/anders/.docker/machine/machines/default/boot2docker.iso...
(default) Creating VirtualBox VM...
(default) Creating SSH key...
(default) Starting the VM...
(default) Check network to re-create if needed...
(default) Waiting for an IP...
Waiting for machine to be running, this may take a few minutes...
Detecting operating system of created instance...
Waiting for SSH to be available...
Detecting the provisioner...
Provisioning with boot2docker...
Copying certs to the local machine directory...
Copying certs to the remote machine...
Setting Docker configuration on the remote daemon...
Checking connection to Docker...
Docker is up and running!
To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: docker-machine env default

Copy to the machine

docker-machine scp kubectl default:kubectl
docker-machine scp minikube default:minikube
# Unfortunately, installing from a file URI seems to be broken (use cache location instead)
# docker-machine scp localkube default:/mnt/sda1/tmp/localkube
docker-machine ssh default mkdir -p .minikube/cache/localkube && \
docker-machine scp localkube default:.minikube/cache/localkube/localkube-$KUBERNETES_VERSION

# Prime the TCL package manager cache with the packages we need (bash and its dependencies)
for tcz in tcz/*; do docker-machine scp $tcz default:/tmp/tce/optional/; done

Logging in to machine

docker-machine ssh default

                        ##         .
                  ## ## ##        ==
               ## ## ## ## ##    ===
           /"""""""""""""""""\___/ ===
      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
           \______ o           __/
             \    \         __/
              \____\_______/
 _                 _   ____     _            _
| |__   ___   ___ | |_|___ \ __| | ___   ___| | _____ _ __
| '_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ '__|
| |_) | (_) | (_) | |_ / __/ (_| | (_) | (__|   <  __/ |
|_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|
Boot2Docker version 17.10.0-ce, build HEAD : 34fe485 - Wed Oct 18 17:16:34 UTC 2017
Docker version 17.10.0-ce, build f4ffd25

Installing bash shell

tce-load -i bash.tcz

docker@default:~$ tce-load -i bash.tcz
ncurses.tcz: OK
readline.tcz: OK
bash.tcz: OK

Installing minikube

# Unfortunately, installing from a file URI seems to be broken (use cache location instead)
#sudo -E ./minikube start --vm-driver=none --kubernetes-version=file:///mnt/sda1/tmp/localkube

export MINIKUBE_WANTUPDATENOTIFICATION=false
export MINIKUBE_WANTREPORTERRORPROMPT=false
export MINIKUBE_HOME=$HOME
export CHANGE_MINIKUBE_NONE_USER=true
./minikube config set WantKubectlDownloadMsg false 2>/dev/null # stfu
sudo -E ./minikube start --vm-driver=none --kubernetes-version=v1.8.0

Starting local Kubernetes v1.8.0 cluster...
Starting VM...
Getting VM IP address...
Moving files into cluster...
Setting up certs...
Connecting to cluster...
Setting up kubeconfig...
Starting cluster components...
Kubectl is now configured to use the cluster.
===================
WARNING: IT IS RECOMMENDED NOT TO RUN THE NONE DRIVER ON PERSONAL WORKSTATIONS
	The 'none' driver will run an insecure kubernetes apiserver as root that may leave the host vulnerable to CSRF attacks

Checking installation

> cat ~/.kube/config
apiVersion: v1
clusters:
- cluster:
    certificate-authority: /home/docker/.minikube/ca.crt
    server: https://127.0.0.1:8443
  name: minikube
contexts:
- context:
    cluster: minikube
    user: minikube
  name: minikube
current-context: minikube
kind: Config
preferences: {}
users:
- name: minikube
  user:
    client-certificate: /home/docker/.minikube/client.crt
    client-key: /home/docker/.minikube/client.key
$ sleep 60
$ ./kubectl get pods --all-namespaces
NAMESPACE     NAME                         READY     STATUS    RESTARTS   AGE
kube-system   kube-addon-manager-default   1/1       Running   0          1m
kube-system   kube-dns-6fc954457d-gfbcl    3/3       Running   0          46s
kube-system   kubernetes-dashboard-8v2z5   1/1       Running   0          46s
$ ./kubectl get service -n kube-system kubernetes-dashboard
NAME                   TYPE       CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes-dashboard   NodePort   10.0.0.144   <none>        80:30000/TCP   1m

Leave the machine

exit

start ssh tunnels

Run ssh in the background

docker-machine ssh default -L 8443:127.0.0.1:8443 -L 30000:127.0.0.1:30000 -N &
  • 8443 (minikube api-server)
  • 30000 (dashboard NodePort)

setup local config

Copy and modify configuration

docker-machine scp default:.kube/config admin.conf

docker-machine scp default:.minikube/ca.crt .
docker-machine scp default:.minikube/client.crt .
docker-machine scp default:.minikube/client.key .

sed -e 's|/home/docker/.minikube|.|' -i admin.conf

kubernetes client

Using tunnel and configuration

export KUBECONFIG=$PWD/admin.conf

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.0", GitCommit:"6e937839ac04a38cac63e6a7a306c5d035fe7b0a", GitTreeState:"clean", BuildDate:"2017-09-28T22:57:57Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.0", GitCommit:"0b9efaeb34a2fc51ff8e4d34ad9bc6375459c4a4", GitTreeState:"dirty", BuildDate:"2017-10-17T15:09:55Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
$ kubectl get nodes
NAME      STATUS    ROLES     AGE       VERSION
default   Ready     <none>    1m        v1.8.0
$ kubectl get pods --all-namespaces
NAMESPACE     NAME                         READY     STATUS    RESTARTS   AGE
kube-system   kube-addon-manager-default   1/1       Running   0          2m
kube-system   kube-dns-6fc954457d-bldll    3/3       Running   0          1m
kube-system   kubernetes-dashboard-gc89w   1/1       Running   0          1m

minikube dashboard

xdg-open http://127.0.0.1:30000

Kubernetes Dashboard

minikube docker-env

eval $(docker-machine env default)

$ docker ps
CONTAINER ID        IMAGE                                                  COMMAND                  CREATED             STATUS              PORTS               NAMES
5c90876081b6        gcr.io/google_containers/k8s-dns-sidecar-amd64         "/sidecar --v=2 --..."   6 minutes ago       Up 6 minutes                            k8s_sidecar_kube-dns-6fc954457d-gfbcl_kube-system_faf22751-b71e-11e7-a492-d61753289c7c_0
e5e2c8b10439        gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64   "/dnsmasq-nanny -v..."   6 minutes ago       Up 6 minutes                            k8s_dnsmasq_kube-dns-6fc954457d-gfbcl_kube-system_faf22751-b71e-11e7-a492-d61753289c7c_0
33f6c4ee6a32        gcr.io/google_containers/k8s-dns-kube-dns-amd64        "/kube-dns --domai..."   6 minutes ago       Up 6 minutes                            k8s_kubedns_kube-dns-6fc954457d-gfbcl_kube-system_faf22751-b71e-11e7-a492-d61753289c7c_0
afe81f9e5706        gcr.io/google_containers/kubernetes-dashboard-amd64    "/dashboard --inse..."   6 minutes ago       Up 6 minutes                            k8s_kubernetes-dashboard_kubernetes-dashboard-8v2z5_kube-system_fabefb1e-b71e-11e7-a492-d61753289c7c_0
ffa1e9356c6e        gcr.io/google_containers/pause-amd64:3.0               "/pause"                 6 minutes ago       Up 6 minutes                            k8s_POD_kube-dns-6fc954457d-gfbcl_kube-system_faf22751-b71e-11e7-a492-d61753289c7c_0
750992f0c468        gcr.io/google_containers/pause-amd64:3.0               "/pause"                 6 minutes ago       Up 6 minutes                            k8s_POD_kubernetes-dashboard-8v2z5_kube-system_fabefb1e-b71e-11e7-a492-d61753289c7c_0
e97e57d72cdb        gcr.io/google-containers/kube-addon-manager            "/opt/kube-addons.sh"    6 minutes ago       Up 6 minutes                            k8s_kube-addon-manager_kube-addon-manager-default_kube-system_9831e93c3188555873fdb49f43198eef_0
00fc4262d487        gcr.io/google_containers/pause-amd64:3.0               "/pause"                 6 minutes ago       Up 6 minutes                            k8s_POD_kube-addon-manager-default_kube-system_9831e93c3188555873fdb49f43198eef_0
$ docker images
REPOSITORY                                             TAG                 IMAGE ID            CREATED             SIZE
gcr.io/google_containers/k8s-dns-sidecar-amd64         1.14.5              fed89e8b4248        3 weeks ago         41.8MB
gcr.io/google_containers/k8s-dns-kube-dns-amd64        1.14.5              512cd7425a73        3 weeks ago         49.4MB
gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64   1.14.5              459944ce8cc4        3 weeks ago         41.4MB
gcr.io/google_containers/kubernetes-dashboard-amd64    v1.6.3              691a82db1ecd        2 months ago        139MB
gcr.io/google-containers/kube-addon-manager            v6.4-beta.2         0a951668696f        4 months ago        79.2MB
gcr.io/google_containers/pause-amd64                   3.0                 99e59f495ffa        17 months ago       747kB
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