Minikube Operations: Difference between revisions

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=External=
=External=
* https://minikube.sigs.k8s.io/docs/start/
* https://minikube.sigs.k8s.io/docs/start/
* https://minikube.sigs.k8s.io/docs/commands/


=Internal=
=Internal=
Line 9: Line 10:


Administration is done with <code>minikube</code>.
Administration is done with <code>minikube</code>.
=Addons=
minikube instance must be running for "addons" to work.
<syntaxhighlight lang='text'>
minikube addons list
</syntaxhighlight>
<syntaxhighlight lang='text'>
minikube addons enable <addon-name>
</syntaxhighlight>


=Start=
=Start=
{{External|https://minikube.sigs.k8s.io/docs/commands/start/}}
==Start Overview==
==Start Example==
<syntaxhighlight lang='bash'>
<syntaxhighlight lang='bash'>
minikube start
 
minikube start [-v=10] [--driver=none] [--kubernetes-version "v1.19.1"]


   minikube v1.12.3 on Darwin 10.14.6
   minikube v1.12.3 on Darwin 10.14.6
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</syntaxhighlight>
</syntaxhighlight>


==Start with Admission Controller Enabled==
--driver=none option is relevant to accessing host-level directories from pods and exposing them as hostPaths. Also see {{Internal|Minikube Concepts#Drivers|Minikube Concepts &124; Drivers}}
 
==Kubernetes Configuration at Startup==
{{External|https://minikube.sigs.k8s.io/docs/handbook/config/#modifying-kubernetes-defaults}}
<syntaxhighlight lang='bash'>
minikube start --extra-config=.... --extra-config=...
</syntaxhighlight>
 
<syntaxhighlight lang='bash'>
minikube start --extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy
</syntaxhighlight>
 
===Custom Configuration Files===
 
Files placed in ~/.minikube/files (including recursive directories) are transferred into minikube VM. A file placed in ~/.minikube/files/etc/tokens.csv is copied in the VM as /etc/token.csv. That can actually be verified by <code>minikube ssh</code> into the VM after boot.
 
===Start with Admission Controller Enabled===
See [[#Enable_Pod_Security_Policies|Enable Pod Security Policies]] below for an example how to start with a PodSecurityPolicy admission controller.
See [[#Enable_Pod_Security_Policies|Enable Pod Security Policies]] below for an example how to start with a PodSecurityPolicy admission controller.


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=Stop=
=Stop=
{{External|https://minikube.sigs.k8s.io/docs/commands/stop/}}
Stop the local Kubernetes cluster. This command stops the underlying VM or container, but keeps [[Minikube_Concepts#User_Data|user data]] intact. The cluster can be started again with the [[#Start|start]] command.
<syntaxhighlight lang='bash'>
<syntaxhighlight lang='bash'>
minikube stop
minikube stop
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🛑  1 nodes stopped.
🛑  1 nodes stopped.
</syntaxhighlight>
</syntaxhighlight>
=Delete=
{{External|https://minikube.sigs.k8s.io/docs/commands/delete/}}
Deletes a local Kubernetes cluster. This command deletes the VM, and removes all associated files.
<syntaxhighlight lang='bash'>
minikube delete --all --purge
</syntaxhighlight>
--all deletes all profiles.
--purge deletes  delete the '.minikube' folder from the user directory.


=Dashboard=
=Dashboard=
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=Version=
=Version=
<syntaxhighlight lang='bash'>
<syntaxhighlight lang='bash'>
minikube version
minikube version
</syntaxhighlight>
</syntaxhighlight>
=Delete=
==Kubernetes Version==
 
After minikube starts:
<syntaxhighlight lang='bash'>
kubectl version
</syntaxhighlight>
Also, nodes report their Kubernetes version:
<syntaxhighlight lang='bash'>
<syntaxhighlight lang='bash'>
minikube delete --all
kubectl get nodes
</syntaxhighlight>
</syntaxhighlight>
Also see: {{Internal|Minikube_Configuration#Configure_Kubernetes_Version|Minikube Configuration}}
=Node Operations=
{{External|https://minikube.sigs.k8s.io/docs/commands/node/}}


=Enable Pod Security Policies=
=Enable Pod Security Policies=
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minikube start --extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy --addons=pod-security-policy
minikube start --extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy --addons=pod-security-policy
</syntaxhighlight>
</syntaxhighlight>
=CRI-O=
{{Internal|CRI-O minikube|CRI-O Support on minikube}}
=Mount=
{{External|https://minikube.sigs.k8s.io/docs/handbook/mount/}}
If minikube runs in its own VM, host directories can be exposed as hostPath only if they are mounted in the VM. This issue does not exist if minikube does not use a VM and runs in "bare-metal" configuration. See minikube start --driver=none option. Also see {{Internal|Minikube Concepts#Drivers|Minikube Concepts &#124; Drivers}}
Also see: {{Internal|Kubernetes_Storage_Concepts#hostPath_on_single-node_Kubernetes_Clusters_.28minikube.2C_Docker_Desktop_Kubernetes.29|hostPath on single-node Kubernetes Clusters (minikube, Docker_Desktop_Kubernetes)}}
=Configuration=
{{Internal|Minikube Configuration|Minikube Configuration}}
=Troubleshooting=
{{External|https://minikube.sigs.k8s.io/docs/handbook/troubleshooting/}}
<syntaxhighlight lang='bash'>
minikube logs
</syntaxhighlight>
<syntaxhighlight lang='bash'>
minikube start --alsologtostderr --v=2
</syntaxhighlight>
Obtaining details about kube-apiserver startup arguments:
<syntaxhighlight lang='bash'>
kubectl -n kube-system describe pod kube-apiserver-minikube
</syntaxhighlight>
SSH into the minikube VM:
<syntaxhighlight lang='bash'>
minikube ssh
</syntaxhighlight>
To get more details about IP and port:
<syntaxhighlight lang='bash'>
minikube ssh --v=2 --alsologtostderr
</syntaxhighlight>
Then you can use the IP address (127.0.0.1) and the port to connect via native SSH:
<syntaxhighlight lang='bash'>
ssh docker@127.0.0.1 -p 32799 -i ~/.minikube/machines/minikube/id_rsa
</syntaxhighlight>
For file transfer, a local directory can be mounted into the minikube VM (failed last time I tried it):
<syntaxhighlight lang='bash'>
minikube mount ~/tmp/minikube:/tmp/temporary
</syntaxhighlight>
Files can be transferred back and forth via scp:
<syntaxhighlight lang='bash'>
scp -P 32799 -i ~/.minikube/machines/minikube/id_rsa docker@127.0.0.1:/var/tmp/minikube/kubeadm.yaml .
</syntaxhighlight>
==hostPath Mount Troubleshooting==
ssh into the VM:
<syntaxhighlight lang='bash'>
minikube ssh
</syntaxhighlight>
Find the container for the pod in question:
<syntaxhighlight lang='bash'>
docker ps
</syntaxhighlight>
Describe the container:
<syntaxhighlight lang='bash'>
docker inspect <container-id>
</syntaxhighlight>
Look for "Binds".

Latest revision as of 06:07, 10 June 2021

External

Internal

Overview

Administration is done with minikube.

Addons

minikube instance must be running for "addons" to work. 

minikube addons list

minikube addons enable <addon-name>

Start

https://minikube.sigs.k8s.io/docs/commands/start/

Start Overview

Start Example

minikube start [-v=10] [--driver=none] [--kubernetes-version "v1.19.1"] 

  minikube v1.12.3 on Darwin 10.14.6
✨  Automatically selected the docker driver
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
💾  Downloading Kubernetes v1.18.3 preload ...
    > preloaded-images-k8s-v5-v1.18.3-docker-overlay2-amd64.tar.lz4: 510.91 MiB
🔥  Creating docker container (CPUs=2, Memory=8100MB) ...
🐳  Preparing Kubernetes v1.18.3 on Docker 19.03.8 ...
🔎  Verifying Kubernetes components...
🌟  Enabled addons: default-storageclass, storage-provisioner
🏄  Done! kubectl is now configured to use "minikube"

❗  /usr/local/bin/kubectl is version 1.16.6-beta.0, which may be incompatible with Kubernetes 1.18.3.
💡  You can also use 'minikube kubectl -- get pods' to invoke a matching version

--driver=none option is relevant to accessing host-level directories from pods and exposing them as hostPaths. Also see

Minikube Concepts &124; Drivers

Kubernetes Configuration at Startup

https://minikube.sigs.k8s.io/docs/handbook/config/#modifying-kubernetes-defaults
minikube start --extra-config=.... --extra-config=...

minikube start --extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy

Custom Configuration Files

Files placed in ~/.minikube/files (including recursive directories) are transferred into minikube VM. A file placed in ~/.minikube/files/etc/tokens.csv is copied in the VM as /etc/token.csv. That can actually be verified by minikube ssh into the VM after boot.

Start with Admission Controller Enabled

See Enable Pod Security Policies below for an example how to start with a PodSecurityPolicy admission controller.

Status

minikube status

minikube
type: Control Plane
host: Running
kubelet: Running
apiserver: Running
kubeconfig: Configured

Stop

https://minikube.sigs.k8s.io/docs/commands/stop/

Stop the local Kubernetes cluster. This command stops the underlying VM or container, but keeps user data intact. The cluster can be started again with the start command. 

minikube stop

✋  Stopping node "minikube"  ...
🛑  Powering off "minikube" via SSH ...
🛑  1 nodes stopped.

Delete

https://minikube.sigs.k8s.io/docs/commands/delete/

Deletes a local Kubernetes cluster. This command deletes the VM, and removes all associated files. 

minikube delete --all --purge

--all deletes all profiles.

--purge deletes delete the '.minikube' folder from the user directory.

Dashboard

minikube dashboard

Version

minikube version

Kubernetes Version

After minikube starts: 

kubectl version

Also, nodes report their Kubernetes version: 

kubectl get nodes

Also see:

Minikube Configuration

Node Operations

https://minikube.sigs.k8s.io/docs/commands/node/

Enable Pod Security Policies

https://minikube.sigs.k8s.io/docs/tutorials/using_psp/
minikube stop
minikube start --extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy --addons=pod-security-policy

CRI-O

CRI-O Support on minikube

Mount

https://minikube.sigs.k8s.io/docs/handbook/mount/

If minikube runs in its own VM, host directories can be exposed as hostPath only if they are mounted in the VM. This issue does not exist if minikube does not use a VM and runs in "bare-metal" configuration. See minikube start --driver=none option. Also see

Minikube Concepts | Drivers

Also see:

hostPath on single-node Kubernetes Clusters (minikube, Docker_Desktop_Kubernetes)

Configuration

Minikube Configuration

Troubleshooting

https://minikube.sigs.k8s.io/docs/handbook/troubleshooting/
minikube logs

minikube start --alsologtostderr --v=2

Obtaining details about kube-apiserver startup arguments: 

kubectl -n kube-system describe pod kube-apiserver-minikube

SSH into the minikube VM: 

minikube ssh

To get more details about IP and port: 

minikube ssh --v=2 --alsologtostderr

Then you can use the IP address (127.0.0.1) and the port to connect via native SSH: 

ssh docker@127.0.0.1 -p 32799 -i ~/.minikube/machines/minikube/id_rsa

For file transfer, a local directory can be mounted into the minikube VM (failed last time I tried it): 

minikube mount ~/tmp/minikube:/tmp/temporary

Files can be transferred back and forth via scp: 

scp -P 32799 -i ~/.minikube/machines/minikube/id_rsa docker@127.0.0.1:/var/tmp/minikube/kubeadm.yaml .

hostPath Mount Troubleshooting

ssh into the VM: 

minikube ssh

Find the container for the pod in question: 

docker ps

Describe the container: 

docker inspect <container-id>

Look for "Binds".

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