Run two kubectl commands in a pipe, having output of the first one as an input for the second

[Kostya Kostyushko]

For apply / replace configMap I need to run two kubectl commands in the following way:

kubectl create configmap sb-products-files --from-file=configmap_files/ \

   -o yaml --dry-run=client | kubectl replace --namespace=myNamespace -f -

Basically, I need to run one command, and it's output send as input to another command.

Is there any way to accomplish it in bitbucket pipeline?

[Ziga Gregoric]

I've got similar issue. I need to execute `kubectl` to generate a manifest file on the fly. 

kubectl create configmap foo --from-file=foo.txt -o yaml --dry-run > foo.yaml

Using atlassian/kubectl-run would require me to configure and provide KUBE_CONFIG (because it's mandatory for that pipe) which I'd like to avoid. 

- pipe: atlassian/kubectl-run:3.1.2
  variables:
    KUBE_CONFIG: '<string>'
    KUBECTL_COMMAND: '<string>'

So I ended up adding an extra step with custom image to generate output file which I pass to the next step through as an artifact.

- step: 
    name: 'Create ConfigMap'
    image: bitnami/kubectl
    artifacts:
      - foo.yaml
    script:
      - kubectl create configmap foo --from-file=foo.txt -o yaml --dry-run > foo.yaml

For such cases, lifting requirement for mandatory KUBE_CONFIG in the official pipe would be practical (or to add `kubectl` to atlassian/default-image).

[Halyna Berezovska]

@Kostya Kostyushko you could execute create configmap firstly and save it to file, and then run a pipe with RESOURCE_PATH equal to that file you saved output to

Regards, Galyna

[Kostya Kostyushko]

Can you give examples please? I tried to make something, but it didn't work.

[Halyna Berezovska]

@Kostya Kostyushko I meant somethong like

script:
- kubectl ... > output.yml
- pipe: atlassian/kubectl-run:2.0.0
  variables:
    ...
    RESOURCE_PATH: 'output.yaml'

The location of your resource file can vary depending on your requirements and project structure.

Regards, Galyna

[Kostya Kostyushko]

bash: kubectl: command not found

I'm using

Images used:    build : docker.io/atlassian/default-image

[Kostya Kostyushko]

Ok. I found.
For those who need to run multiple kubectl commands
this will be a good solution:

      - step:
          # trigger: manual
          name: Deploy to Kubernetes
          image: atlassian/pipelines-kubectl
          script:
            # NOTE: $KUBECONFIG is secret stored as a base64 encoded string
            # Base64 decode our kubeconfig file into a temporary kubeconfig.yml file (this will be destroyed automatically after this step runs)
            - echo $KUBECONFIG | base64 -d > kubeconfig.yml
            # Tell our Kubernetes deployment to use the new Docker image tag
            - kubectl --kubeconfig=kubeconfig.yml --namespace=<namespace> set image deployment/<deployment-name> <deployment-name>=<docker-username>/<docker-image>:$BITBUCKET_COMMIT

by using  image: atlassian/pipelines-kubectl

[Halyna Berezovska]

@Kostya Kostyushko yeap, you can use also kubectl official version, whatever is suitable for you

In the future we may think about suppoorting output sharing from pipe execution, so that you can execute pipes sequentially passing output from previous execution