Minikube installation on Windows wsl Ubuntu
curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube
Start your cluster
minikube start --mount=true --mount-string="/minikube-volume-abs:/minikube-volume-mount"
A more complete command to start a cluster with multiple options
start-minikube.sh
#!/bin/bash minikube start --static-ip 192.168.49.2 --nodes 1 --insecure-registry registry.mydavidh.org:5000 --mount=true --mount-string="/minikube-volume-abs:/minikube-volume-mount" --ports="30000:30000,30001:30001,8080:8080,8081:8081" kubectl config set-context --current --namespace=my-apps export DEV_IP=172.16.1.1 sudo ifconfig lo:0 $DEV_IP minikube ssh "echo \"$DEV_IP registry.mydavidh.org\" | sudo tee -a /etc/hosts" |
Helpful information:
– We use a static IP to be able to use with a constant address a reference from the pod to the minikube host. This is helpful for communication between pods
relying on cluster IP.
– We specify one node but we can specify more.
– We specify to use an insecure registry. Of course, this registry has to be defined separately.
– We use a mount
– We specify a port forwarding from the pod to the (external) host.
After the mini cube start we do some other tasks:
– We set the kubernetes context
– We define a fixed IP for the registry inside minikube host
The mount option in minikube
Only the start argument is required to start a cluster. But if we want to mount some volumes as host path in our kubernetes deployment objects, we need
to specify a mount.
Documentation:
--mount-string='/minikube-volume-abs:/minikube-volume-mount':
The argument to pass the minikube mount command on start.
The first part of the argument /minikube-volume-abs specifies the physical location of the directory on the host.
The second part of the argument minikube-volume-mount specifies the virtual location of the directory that we could specify on the kubernetes
deployment object.
Example:
david@david-PC / $ ls -lah total 2.0M drwxr-xr-x 21 root root 4.0K May 17 13:47 . drwxr-xr-x 21 root root 4.0K May 17 13:47 .. lrwxrwxrwx 1 root root 7 Feb 16 2022 bin -> usr/bin drwxr-xr-x 2 root root 4.0K Feb 16 2022 boot drwxr-xr-x 101 root root 4.0K May 17 15:46 etc drwxr-xr-x 3 root root 4.0K May 1 14:34 home ..................... drwxr-xr-x 4 root root 4.0K May 17 15:22 minikube-volume-abs |
volumes: - name: prometheus-config hostPath: path: /minikube-volume-mount/prometheus-config - name: prometheus-data hostPath: path: /minikube-volume-mount/prometheus-data |
Helpful information
Access to the host from a pod: host.minikube.internal
Start minikube to be able to use a local docker registry
Reference:
https://gist.github.com/trisberg/37c97b6cc53def9a3e38be6143786589
Here we also set a mount:
minikube start --insecure-registry registry.mydavidh.org:5000 --mount=true --mount-string="/minikube-volume-abs:/minikube-volume-mount"
A last step is required to make minikube to be able to query the registry: adding the host mapping.
export DEV_IP=172.16.1.1 sudo ifconfig lo:0 $DEV_IP minikube ssh "echo \"$DEV_IP registry.mydavidh.org\" | sudo tee -a /etc/hosts" |
How to use kubectl with minikube
– If you have kubectl installed, you can use it.
– Else minikube can download the appropriate version of kubectl if you run the subcommand kubectl:
minikube kubectl -- get pod
Enable completion :
alias kubectl="minikube kubectl --"
Other common Minikube commands
Stops a local Kubernetes cluster.
It stops the underlying VM or container, but keeps user data intact.
The cluster can be started again with the start command.
minikube stop
Pause Kubernetes.
It does not impact deployed applications.
minikube pause
Unpause a paused instance.
minikube unpause
Deletes a local Kubernetes cluster.
It deletes the underlying VM or container and removes all associated files.
minikube delete
Returns the Kubernetes URL(s) for service(s) in your local cluster.
minikube service -n
The -n parameter represents the service namespace.
By default, minikube uses the « default » namespace.
Example:
kubectl get -A service NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE default kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21h kube-system kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 21h tools prometheus NodePort 10.107.175.208 <none> 9090:31000/TCP 21h david@david-PC / $ minikube service -n tools prometheus |-----------|------------|--------------|---------------------------| | NAMESPACE | NAME | TARGET PORT | URL | |-----------|------------|--------------|---------------------------| | tools | prometheus | prom-ui/9090 | http://192.168.49.2:31000 | |-----------|------------|--------------|---------------------------| 🏃 Starting tunnel for service prometheus. |-----------|------------|-------------|------------------------| | NAMESPACE | NAME | TARGET PORT | URL | |-----------|------------|-------------|------------------------| | tools | prometheus | | http://127.0.0.1:36483 | |-----------|------------|-------------|------------------------| 🎉 Opening service tools/prometheus in default browser... 👉 http://127.0.0.1:36483 ❗ Because you are using a Docker driver on linux, the terminal needs to be open to run it. |
Provides instructions to point your terminal’s docker-cli to the Docker Engine inside minikube.
minikube docker-env
This command is useful to know how the docker containers are running and to run containers inside minikube context.
Example output:
minikube docker-env export DOCKER_TLS_VERIFY="1" export DOCKER_HOST="tcp://127.0.0.1:49186" export DOCKER_CERT_PATH="/home/david/.minikube/certs" export MINIKUBE_ACTIVE_DOCKERD="minikube" |
To point your shell to minikube’s docker-daemon:
eval $(minikube -p minikube docker-env)
Export a docker image from the docker host to the minikube host
docker save registry.mydavidh.org:5000/modeler-flask:1.0.0 -o modeler-flask.tar eval $(minikube docker-env) docker load -i modeler-flask.tar |
Common options
-p, --profile profile_foo : the name of the minikube VM being used.
This can be set to allow having multiple instances of minikube independently. (default « minikube »)