Kubernetes Ansible Operators - Patch an Existing Kubernetes Resource fails

[George Tsoumplekas]

Hello,

I am newbie in Kubernetes, ansible and operators

I try to rollback a current deployment , but fails with invalid patch error.

I have the following kubernetes command

kubectl patch deployment -n my-namespace mydeployment --type='json' -p='[ {"op": "replace", "path": "/spec/template/spec/containers/0/image", "value":"192.168.1.1:5000/mydeployment:image_version"} ]

Is any way to introduce a json array in kubernetes ansible command and patch my deployment?

I defined the  following role  in my playbook

- name: Demo

  k8s:

    api_version: apps/v1

    kind: Deployment

    state: present

    namespace: '{{ meta.namespace }}'

    name: my-operator

    definition: |

      spec:

       template:

         spec:

          containers:

            my-operator:

              image: "{{ installed_software_image }}"    

  register: output

- name: Demo k8s: api_version: apps/v1 kind: Deployment state: present namespace: '{{ meta.namespace }}' name: my-operator definition: | spec: template: spec: containers: my-operator: image: {{ installed_software_image }} register: output

Due to the fact that containers is an array , the patch command fails . I get the following error

v1.Deployment.Spec: v1.DeploymentSpec.Template: v1.PodTemplateSpec.Spec: v1.PodSpec.Containers: []v1.Container: decode slice: expect [ or n, but found {, error found in #10 byte of ...|tainers\\\

Is any way to do debug or to print the command that actually is sent to kubernetes server?

I will appreciate your help

The question has been posted in stack overflow as well

https://stackoverflow.com/questions/66790966/kubernetes-ansible-operators-patch-an-existing-deployment-fails

[Carlos Santana]

Hi George

The error is indicating that “containers:” is an array. 

Try adding “- “ in front of “my-operaror:” to indicate that it's the first item in the array 

[Melvin Hillsman]

Your playbook is YAML and here is the documentation on creating an array https://www.w3schools.io/file/yaml-arrays/

You need a - before my-operator

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[George Tsoumplekas]

Thank you for the hint and for the tutorial. I have no experience in kubernetes , ansible e.t.c

I put the - before my operator .Seems that , array is recongized . However a new error was generated 

Deployment.apps \\\\\"my-operator\\\\\" is invalid: [spec.template.spec.containers[0].name: Required value, spec.template.spec.containers[0].image: Required value]\

[Melvin Hillsman]

Your container needs an image to run. Familiarize yourself with Kubernetes via the upstream documentation or a book, even though it is quite outdated now, Kubernetes In Action is good; a second edition is being written https://www.manning.com/books/kubernetes-in-action-second-edition

Ansible has good documentation - https://docs.ansible.com - and review the K8s collection docs as well https://galaxy.ansible.com/community/kubernetes

To view this discussion on the web visit https://groups.google.com/d/msgid/operator-framework/012ff306-99d5-42f8-9a9e-cc1e84ae27a1n%40googlegroups.com.

[tsoumplekas_giorgos]

Hello Melvin,

I am confused.  The playbook runs in a container.

I need to roll back the image .. I set this image to spec.template.spec.containers[0].image. The image name is stored in installed_software_image variable . I printed this value and it is not empty.. 

After the aforementioned changes the format is the following 

- name: Demo

  k8s:

    api_version: apps/v1

    kind: Deployment

    state: present

    namespace: '{{ meta.namespace }}'

    name: my-operator

    definition: |

      spec:

       template:

         spec:

          containers:

             - my-operator:

               image: "{{ installed_software_image }}"    

Probably I am missing something.