Ignoring Differences in Argocd

Andrés Cabrera

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Sep 16, 2024

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Sometimes, ArgoCD struggles to synchronize dynamic changes in Kubernetes objects. To handle this, we can use the ignoreDifferences option within our Applications or ApplicationSets. This allows us to ignore specific differences, ensuring that our applications in ArgoCD remain in sync even when certain changes occur.

AppSet Example

Let’s look at an example involving Jenkins. In this scenario, the secret for the Jenkins application is always marked as OutOfSync because we’re using LDAP for user login, making the traditional secret no longer necessary.

YAML example:

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: devops-apps
  namespace: argocd
spec:
  goTemplate: true
  generators:
  - list:
      elements:
      - appName: jenkins
        url: https://charts.jenkins.io/
        chartName: jenkins
        revision: 5.1.21
        values:
          path: jenkins
      - appName: nexus
        url: https://stevehipwell.github.io/helm-charts/
        chartName: nexus3
        revision: 4.45.0
        values:
          path: nexus
  template:
    metadata:
      name: '{{.appName}}-app'
    spec:
      project: default
      sources:
      - repoURL: 'some_repo'
        targetRevision: master
        ref: values
      - chart: '{{.chartName}}'
        repoURL: '{{.url}}'…