Kubernetes Sandbox with Docker, minikube and kubectl⚑

Contents⚑

Video⚑

Installations and Setup⚑

Install Script⚑
sudo cinst kubernetes-cli minikube docker-desktop
Review Help and Validate Versions⚑
kubectl version
kubectl help
minikube help

Minikube and Kubernetes CLI⚑

Minikube⚑

kubectl⚑

In our simplified minikube setup, kubectl is the powerhouse that works with and submits commands to create, destroy, and manipulate resources within the minikube cluster.

Start Services⚑

Start Docker:⚑

Ensure the Docker Daemon is running, otherwise you will recieve this error message:

![[Screenshot 2021-07-27 005944.png]]

**Note the highlighted lines**

Start-Process docker-desktop.exe

Start Minikube:⚑

Optional: Update kubectl via command line arguments passes to minikube start

# start minikube and upgrade 
minikube start --kubernetes-version=v1.21.2

Upon Successful start of the minikube service in the docker daemon:

Also, note the docker container and new volume:

Verify Setup Runtime⚑

kubectl get nodes
minikube status

Output:

Review kubectl get --help Information⚑

Review help for kubectl get via kubectl get --help:

kubectl get --help

Display one or many resources

 Prints a table of the most important information about the specified resources. You can filter the list using a label selector and the --selector flag. 
 If the desired resource type is namespaced you will only see results in your current namespace unless you pass --all-namespaces.

 Uninitialized objects are not shown unless --include-uninitialized is passed.

 By specifying the output as 'template' and providing a Go template as the value of the --template flag, you can filter the attributes of the fetched resources.

Use "kubectl api-resources" for a complete list of supported resources.

Examples:
  # List all pods in ps output format.
  kubectl get pods

  # List all pods in ps output format with more information (such as node name).
  kubectl get pods -o wide

  # List a single replication controller with specified NAME in ps output format.
  kubectl get replicationcontroller web

  # List deployments in JSON output format, in the "v1" version of the "apps" API group:
  kubectl get deployments.v1.apps -o json

  # List a single pod in JSON output format.
  kubectl get -o json pod web-pod-13je7

  # List a pod identified by type and name specified in "pod.yaml" in JSON output format.
  kubectl get -f pod.yaml -o json

  # List resources from a directory with kustomization.yaml - e.g. dir/kustomization.yaml.
  kubectl get -k dir/

  # Return only the phase value of the specified pod.
  kubectl get -o template pod/web-pod-13je7 --template={{.status.phase}}

  # List resource information in custom columns.
  kubectl get pod test-pod -o custom-columns=CONTAINER:.spec.containers[0].name,IMAGE:.spec.containers[0].image

  # List all replication controllers and services together in ps output format.
  kubectl get rc,services

  # List one or more resources by their type and names.
  kubectl get rc/web service/frontend pods/web-pod-13je7

Options:
  -A, --all-namespaces=false: If present, list the requested object(s) across all namespaces. 
                                                            Namespace in current context is ignored even if specified with --namespace.
      --allow-missing-template-keys=true: If true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang
                                                                                    and jsonpath output formats.
      --chunk-size=500: Return large lists in chunks rather than all at once. Pass 0 to disable. This flag is beta and may change in the future.
      --field-selector='': Selector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). 
                                                     The server only supports a limited number of field queries per type.
  -f, --filename=[]: Filename, directory, or URL to files identifying the resource to get from a server.
      --ignore-not-found=false: If the requested object does not exist the command will return exit code 0.
  -k, --kustomize='': Process the kustomization directory. This flag can't be used together with -f or -R.
  -L, --label-columns=[]: Accepts a comma separated list of labels that are going to be presented as columns. Names are case-sensitive. You can also use
                                                    multiple flag options like -L label1 -L label2...
      --no-headers=false: When using the default or custom-column output format, don't print headers (default print headers).
  -o, --output='': Output format. One of: json|yaml|wide|name|custom-columns=...|custom-columns-file=...|go-template=...|go-template-
                                                                    file=...|jsonpath=...|jsonpath-file=... See custom columns [http://kubernetes.io/docs/user-guide/kubectl-overview/#custom-
                                                                    columns], golang template [http://golang.org/pkg/text/template/#pkg-overview] and jsonpath template
                                                                    [http://kubernetes.io/docs/user-guide/jsonpath].
      --output-watch-events=false: Output watch event objects when --watch or --watch-only is used. Existing objects are output as initial ADDED events.
      --raw='': Raw URI to request from the server.  Uses the transport specified by the kubeconfig file.
  -R, --recursive=false: Process the directory used in -f, --filename recursively. Useful when you want to manage related manifests organized within the same
                                                    directory.
  -l, --selector='': Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)
      --server-print=true: If true, have the server return the appropriate table output. Supports extension APIs and CRDs.
      --show-kind=false: If present, list the resource type for the requested object(s).
      --show-labels=false: When printing, show all labels as the last column (default hide labels column)
      --show-managed-fields=false: If true, keep the managedFields when printing objects in JSON or YAML format.
      --sort-by='': If non-empty, sort list types using this field specification.  The field specification is expressed as a JSONPath expression (e.g.
                                        '{.metadata.name}'). The field in the API resource specified by this JSONPath expression must be an integer or a string.
      --template='': Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format is golang templates
                                         [http://golang.org/pkg/text/template/#pkg-overview].
  -w, --watch=false: After listing/getting the requested object, watch for changes. Uninitialized objects are excluded if no object name is provided.
      --watch-only=false: Watch for changes to the requested object(s), without listing/getting first.

Usage:
  kubectl get [(-o|--output=)json|yaml|wide|custom-columns=...|custom-columns-file=...|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=...]
    (TYPE[.VERSION][.GROUP] [NAME | -l label] | TYPE[.VERSION][.GROUP]/NAME ...) [flags] [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).

Nodes, Pods, Services⚑

kubectl get nodes
kubectl get services
kubectl get pod

kubectl get pod will fail because we need to create a cluster.

Create the Kubernetes Cluster Deployment⚑

kubernetes create --help

Pod needs to be based on a certain deployment-based image:

Here I will create a deployment based off the default Nginx docker image called nginx-depl:

kubectl create deployment nginx-depl --image=nginx

# wait for pod to get ready...

kubectl get deployment
kubectl get pod
kubectl get replicaset

Edit Nginx Deployment⚑

kubectl edit deployment nginx-depl

Opens a YAML configuration file: kubectl.exe-edit-3fcpn.yaml which we can edit:

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: "2021-07-27T05:42:46Z"
  generation: 1
  labels:
    app: nginx-depl
  name: nginx-depl
  namespace: default
  resourceVersion: "2826"
  uid: 8c69d8d5-f2d7-4315-ae48-4a0fe2ecfe5a
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: nginx-depl
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx-depl
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status:
  availableReplicas: 1
  conditions:
  - lastTransitionTime: "2021-07-27T05:43:13Z"
    lastUpdateTime: "2021-07-27T05:43:13Z"
    message: Deployment has minimum availability.
    reason: MinimumReplicasAvailable
    status: "True"
    type: Available
  - lastTransitionTime: "2021-07-27T05:42:46Z"
    lastUpdateTime: "2021-07-27T05:43:13Z"
    message: ReplicaSet "nginx-depl-5c8bf76b5b" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  observedGeneration: 1
  readyReplicas: 1
  replicas: 1
  updatedReplicas: 1

Logs⚑

MongoDB Deployment⚑

```powershell kubectl create deployment mongo-depl --image=mongodb

Logs via kubectl logs⚑

Links: 020 - Development | [[Docker]] | Kubernetes | Windows Developer Environment

Sources: - https://www.youtube.com/embed/X48VuDVv0do