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https://github.com/udhos/hellokube


https://github.com/udhos/hellokube

Last synced: 17 days ago
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README 

          
# hellokube



# Cheat sheet



https://kubernetes.io/docs/reference/kubectl/cheatsheet/



# Install GCP SDK



More information here: https://cloud.google.com/sdk/docs/#linux



    wget https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-192.0.0-linux-x86_64.tar.gz

    tar xf google-cloud-sdk-192.0.0-linux-x86_64.tar.gz

    ./google-cloud-sdk/install.sh

    gcloud init



# Install kubectl



    gcloud components update

    gcloud components install kubectl



# Authorize the SDK



    gcloud auth list

    gcloud auth login



# Create cluster 'mycluster-1'



    gcloud container clusters create mycluster-1



## Output



    $ gcloud container clusters create mycluster-1

    WARNING: Currently node auto repairs are disabled by default. In the future this will change and they will be enabled by default. Use `--[no-]enable-autorepair` flag  to suppress this warning.

    WARNING: Starting in Kubernetes v1.10, new clusters will no longer get compute-rw and storage-ro scopes added to what is specified in --scopes (though the latter will remain included in the default --scopes). To use these scopes, add them explicitly to --scopes. To use the new behavior, set container/new_scopes_behavior property (gcloud config set container/new_scopes_behavior true).

    Creating cluster mycluster-1...done.

    Created [https://container.googleapis.com/v1/projects/proj-research/zones/us-central1-b/clusters/mycluster-1].

    To inspect the contents of your cluster, go to: https://console.cloud.google.com/kubernetes/workload_/gcloud/us-central1-b/mycluster-1?project=proj-research

    kubeconfig entry generated for mycluster-1.

    NAME         LOCATION       MASTER_VERSION  MASTER_IP      MACHINE_TYPE   NODE_VERSION  NUM_NODES  STATUS

    mycluster-1  us-central1-b  1.8.10-gke.0    35.224.225.63  n1-standard-1  1.8.10-gke.0  3          RUNNING



# Resize cluster



https://cloud.google.com/sdk/gcloud/reference/container/clusters/resize



    gcloud container clusters resize mycluster-1 --size=2



# Enable cluster autoscaling



One can define cluster autoscaling at creation:



    gcloud container clusters create mycluster-1 --num-nodes 3 --enable-autoscaling --min-nodes 2 --max-nodes 5



Or later:



    gcloud container clusters update mycluster-1 --enable-autoscaling --min-nodes 1 --max-nodes 5 --node-pool default-pool



Notice the cluster autoscaling is defined for every node pool.



# Verify cluster



    gcloud container clusters describe mycluster-1



Verify cluster autoscaling:



    $ gcloud container clusters describe mycluster-1 | grep -A 5 autoscaling

    - autoscaling:

        enabled: true

        maxNodeCount: 5

        minNodeCount: 1

      config:

        diskSizeGb: 100



Verify node count:



    $ gcloud container clusters describe mycluster-1 | grep Node

    currentNodeCount: 2

    currentNodeVersion: 1.8.10-gke.0

        maxNodeCount: 5

        minNodeCount: 1

      initialNodeCount: 3



# Disable cluster autoscaling



    gcloud container clusters update mycluster-1 --no-enable-autoscaling --node-pool default-pool



# Add another node pool



    gcloud container node-pools create pool-2 --cluster mycluster-1 --enable-autoscaling --min-nodes 1 --max-nodes 3



## Output



    $ gcloud container node-pools create pool-2 --cluster mycluster-1 --enable-autoscaling --min-nodes 1 --max-nodes 3

    WARNING: Currently node auto repairs are disabled by default. In the future this will change and they will be enabled by default. Use `--[no-]enable-autorepair` flag  to suppress this warning.

    WARNING: Starting in Kubernetes v1.10, new clusters will no longer get compute-rw and storage-ro scopes added to what is specified in --scopes (though the latter will remain included in the default --scopes). To use these scopes, add them explicitly to --scopes. To use the new behavior, set container/new_scopes_behavior property (gcloud config set container/new_scopes_behavior true).

    Creating node pool pool-2...done.

    Created [https://container.googleapis.com/v1/projects/proj-research/zones/us-central1-b/clusters/mycluster-1/nodePools/pool-2].

    NAME    MACHINE_TYPE   DISK_SIZE_GB  NODE_VERSION

    pool-2  n1-standard-1  100           1.8.10-gke.0



# Show nodes



    $ kubectl get nodes

    NAME                                         STATUS    ROLES     AGE       VERSION

    gke-mycluster-1-default-pool-fe9bc936-jq4l   Ready         4h        v1.8.10-gke.0

    gke-mycluster-1-default-pool-fe9bc936-v7cb   Ready         4h        v1.8.10-gke.0

    gke-mycluster-1-pool-2-6d597c7f-79vm         Ready         1h        v1.8.10-gke.0



# Build image



## Authorize docker



    gcloud auth configure-docker



## Build and push



    project_id="$(gcloud config get-value project -q)"

    docker build -t gcr.io/$project_id/hello-app:v1 .

    docker images

    docker push gcr.io/$project_id/hello-app:v1



## Explore image contents interactively



    docker run -it gcr.io/$project_id/hello-app:v1 sh



## Test image



    docker run --rm -p 8080:8080 gcr.io/$project_id/hello-app:v1



    $ curl http://localhost:8080

    Hello, world!

    Version: 1.0.0

    Hostname: f42424a8d554



## Deploy the application



    kubectl run hello-web --image=gcr.io/$project_id/hello-app:v1 --requests=cpu=100m --port 8080



## List deployments



    kubectl get deployments



## List pods



Notice there is a single replica because the app has been deployment with default replica number.



    $ kubectl get pods

    NAME                         READY     STATUS    RESTARTS   AGE

    hello-web-78fdd597bc-bw9kp   1/1       Running   0          8m



## Expose application to Internet



    kubectl expose deployment hello-web --type=LoadBalancer --port 80 --target-port 8080



## List services



    $ kubectl get services

    NAME         TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE

    hello-web    LoadBalancer   10.47.250.102   35.225.5.98   80:32137/TCP   1m

    kubernetes   ClusterIP      10.47.240.1             443/TCP        6h



## Test service



Open http://35.225.5.98



## Verify application scale



    $ kubectl get deployment hello-web

    NAME        DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE

    hello-web   1         1         1            1           4m



## Scale up application



    kubectl scale deployment hello-web --replicas=3



    $ kubectl get deployment hello-web

    NAME        DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE

    hello-web   3         3         3            3           6m



Notice there are 3 replicas:



    $ kubectl get pods

    NAME                         READY     STATUS    RESTARTS   AGE

    hello-web-78fdd597bc-bw9kp   1/1       Running   0          7m

    hello-web-78fdd597bc-qptws   1/1       Running   0          1m

    hello-web-78fdd597bc-xspcr   1/1       Running   0          1m



## Create Horizontal Pod Autoscaler



https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/



    kubectl autoscale deployment hello-web --cpu-percent=50 --min=1 --max=10

    kubectl get hpa

    kubectl describe hpa



## Create and push image v2



    docker build -t gcr.io/$project_id/hello-app:v2 .

    docker push gcr.io/$project_id/hello-app:v2



## Apply rolling update to deployment



    kubectl set image deployment/hello-web hello-web=gcr.io/$project_id/hello-app:v2



Check http://35.225.5.98/



## Delete resources



Delete service:



    kubectl delete service hello-web



Wait until the load balancer is deleted by using:



    gcloud compute forwarding-rules list



Delete deployment:



    kubectl delete deployment hello-web



Delete images in registry:



    $ gcloud container images list

    NAME

    gcr.io/proj-research/hello-app

    Only listing images in gcr.io/proj-research. Use --repository to list images in other repositories.



    $ gcloud container images list-tags gcr.io/proj-research/hello-app

    DIGEST        TAGS   TIMESTAMP

    d1c50bc05b2e  v1,v2  2018-06-26T18:47:59

    88b076cd90f4         2018-06-26T18:38:12

    4f2dacbeca43         2018-06-26T18:17:34



    gcloud container images delete gcr.io/proj-research/hello-app@sha256:d1c50bc05b2e --force-delete-tags

    gcloud container images delete gcr.io/proj-research/hello-app@sha256:88b076cd90f4 --force-delete-tags

    gcloud container images delete gcr.io/proj-research/hello-app@sha256:4f2dacbeca43 --force-delete-tags



# Create deployment 'hello-server'



    kubectl run hello-server --image gcr.io/google-samples/hello-app:1.0 --port 8080



# Show deployments



    $ kubectl get deployments

    NAME           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE

    hello-server   1         1         1            1           3h



# Show pods



    $ kubectl get pod

    NAME                            READY     STATUS    RESTARTS   AGE

    hello-server-66cb56b679-88sxq   1/1       Running   0          3h



# Expose the application to Internet by creating a Service



    kubectl expose deployment hello-server --type LoadBalancer --port 80 --target-port 8080



# List services



    $ kubectl get services

    NAME           TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)        AGE

    hello-server   LoadBalancer   10.47.241.238   35.193.87.157  80:31906/TCP   34m

    kubernetes     ClusterIP      10.47.240.1               443/TCP        2h



# Inspect application



    $ kubectl get service hello-server

    NAME           TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)        AGE

    hello-server   LoadBalancer   10.47.241.238   35.193.87.157   80:31384/TCP   1h



Application is available on TCP 35.225.112.179:30



# Delete resources



## Delete horizontal pod autoscaller



    kubectl delete hpa hello-server



## Delete load balancer



    kubectl delete service hello-server



## Delete pod



    kubectl delete pod hello-server-66cb56b679-88sxq



## Delete deployment



    kubectl delete deployment hello-server



## Delete cluster



    gcloud container clusters delete mycluster-1



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