如何使用 Ansible 的 community.kubernetes.k8s_info 模块等待 StatefulSet

问题描述

Ansible 有一个很棒的 community.kubernetes 模块。 k8s_info 的有用标志之一是为 Deployment、DaemonSet 和 Pod 实现的 wait。

对于其他 k8s kind，除非提供 wait_condition，否则它将立即返回。 应该提供什么 wait_condition 来等待 StatefulSet？

解决方法

我会使用“帮助程序”任务文件来执行此操作。假设我有一些 roles/commes/tasks/helpers/wait-for.yaml，它是这样的：

- name: "Waits for {{ obj_name }} to startup"
  block:     
  - name: "Checks latest {{ obj_name }} status" 
    debug:   
       msg: |    
         Object Kind {{ check_with.kind | default('nothing returned') }}                
    delay: "{{ wait_for | default(10) }}"
    ignore_errors: True
    retries: "{{ retries_for | default(10) }}"
    until:   
    - >          
        check_with.status is defined
        and check_with.kind is defined
        and check_with.status is defined
        and ((check_with.kind == 'Pod'
              and (check_with.status.containerStatuses[0].ready | default(False)))
             or (check_with.kind == 'DataVolume'
                 and (check_with.status.phase | default(False)) == 'Succeeded')
             or (check_with.kind in [ 'Deployment','DeploymentConfig' ]
                 and (check_with.status.availableReplicas | default(0)) >= 1)
             or (check_with.kind == 'Job'
                 and check_with.status.completionTime is defined
                 and check_with.status.succeeded is defined)
             or (check_with.kind == 'PersistentVolumeClaim'
                 and (check_with.status.phase | default(False)) == 'Bound')
             or (check_with.kind == 'StatefulSet'
                 and (check_with.status.readyReplicas | default(0)) >= 1))

然后，每当我需要等待 Kubernetes 资源时，我都会包含该任务文件，使用：

- include_role:
    name: commons
    tasks_from: helpers/wait-for.yaml
  vars:
    check_with: "{{ lookup('k8s',api_version='apps/v1',kind='StatefulSet',namespace='default',resource_name='my-statefulset') }}"
    obj_name: "Statefulset default/my-statefulset"
    retries_for: 30
    wait_for: 10