IgnoreDifference

[milalima]

Hello guys, I am having an issue with my Argo configuration, and after a long talk into Slack, another guy and I are thinking that maybe it is a bug. Follow the information below:

I am using the following spec:

spec:
  # The Argo project the application belongs to.
  project: {{ $.Values.spec.project }}

  # Destination cluster and namespace to deploy the application
  destination:
    name: {{ $.Values.spec.destination.name }}
    namespace: {{ $.Values.spec.destination.namespace | default $.Values.defaults.namespace }}
  
  # argo sometimes will always be out of sync after a deploy. 
  ignoreDifferences:
  # various keys getting injected by bank-vaults
  - kind: Secret
    jsonPointers:
    - /data/tls.crt
    - /data/tls.key
    - /data/cert.pem
    - /data/connection
    - /data/.dockerconfigjson

However, I need to ignore the last line of this part of the spec in the Stateful

spec:
  podManagementPolicy: OrderedReady
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      component: alertmanager
      release: astronomer-infra-dev
      tier: monitoring
  serviceName: astronomer-infra-dev-alertmanager
  template:
    metadata:
      annotations:
        checksum/configmap: 5fdcab044e2f6a53afb49f098c8cf4632033bdbb37594636aaa373cba35d7dd2
      creationTimestamp: null
      labels:
        component: alertmanager
        release: astronomer-infra-dev
        tier: monitoring
    spec:
      affinity: {}
      containers:
      - args:
        - --config.file=/etc/config/alertmanager.yaml
        - --storage.path=/data
        - --web.external-url=https://alertmanager.infra-dev-astro.infra.activision.com
        - --cluster.listen-address=

I tried the following ways to ignore this code snippet:

• group: apps
  kind: StatefulSet
  jsonPointers:
  - /template/spec/containers

or this way:

kind: StatefulSet
jsonPointers:
- /spec/template/spec/containers

or this way:

• kind: StatefulSet
  jsonPointers:
  • /spec/template/spec/containers/args

or:

• group: apps
  kind: StatefulSet
  jsonPointers:
  • /spec/template/spec/containers/args

or

• group: apps
  kind: StatefulSet
  jsonPointers:
  - /spec/template/spec/containers/0/args/0
  - /spec/template/spec/containers/0/args/1
  - /spec/template/spec/containers/0/args/2
  - /spec/template/spec/containers/0/args/3

or

• group: apps
  kind: StatefulSet
  jsonPointers:
  - '/spec/template/spec/containers/0/args/1'

And none seems to work, and I was wondering if this is a bug into Argo. Does any have any idea?

Thanks

[jannfis]

The following works fine with the guestbook example app (although applied to a Deployment rather than a StatefulSet, and the container's port list instead of start-up arguments, but I guess it should behave the same for both):

To ignore differences on first port:

  ignoreDifferences:                          
  - group: apps                               
    jsonPointers:                             
    - /spec/template/spec/containers/0/ports/0
    kind: Deployment                                       

To ignore differences on all ports:

  ignoreDifferences:                          
  - group: apps                               
    jsonPointers:                             
    - /spec/template/spec/containers/0/ports
    kind: Deployment                                       

[milalima]

Hey Jannfis, you are right. If i choose deployment as kind is working perfectly. However, if I change the kind to Stateful is not working and the ignore difference is not working.