Troubleshooting Tools

The document describes how to use argocd admin subcommands to simplify Argo CD settings customizations and troubleshot connectivity issues.

Settings

Argo CD provides multiple ways to customize system behavior and has a lot of settings. It might be dangerous to modify settings on Argo CD used in production by multiple users. Before applying settings you can use argocd admin subcommands to make sure that settings are valid and Argo CD is working as expected.

The argocd admin settings validate command performs basic settings validation and print short summary of each settings group.

Diffing Customization

Diffing customization allows excluding some resource fields from diffing process. The diffing customizations are configured in resource.customizations field of argocd-cm ConfigMap.

The following argocd admin command prints information about fields excluded from diffing in the specified ConfigMap.

  1. argocd admin settings resource-overrides ignore-differences ./deploy.yaml --argocd-cm-path ./argocd-cm.yaml

Health Assessment

Argo CD provides built-in health assessment for several Kubernetes resources which can be further customized by writing your own health checks in Lua. The health checks are configured in the resource.customizations field of argocd-cm ConfigMap.

The following argocd admin command assess resource health using Lua script configured in the specified ConfigMap.

  1. argocd admin settings resource-overrides health ./deploy.yaml --argocd-cm-path ./argocd-cm.yaml

Resource Actions

Resource actions allows configuring named Lua script which performs resource modification.

The following argocd admin command executes action using Lua script configured in the specified ConfigMap and prints applied modifications.

  1. argocd admin settings resource-overrides run-action /tmp/deploy.yaml restart --argocd-cm-path /private/tmp/argocd-cm.yaml

The following argocd admin command lists actions available for a given resource using Lua script configured in the specified ConfigMap.

  1. argocd admin settings resource-overrides list-actions /tmp/deploy.yaml --argocd-cm-path /private/tmp/argocd-cm.yaml

Cluster credentials

The argocd admin cluster kubeconfig is useful if you manually created Secret with cluster credentials and trying need to troubleshoot connectivity issues. In this case, it is suggested to use the following steps:

1 SSH into [argocd-application-controller] pod.

  1. kubectl exec -n argocd -it \
  2.   $(kubectl get pods -n argocd -l app.kubernetes.io/name=argocd-application-controller -o jsonpath='{.items[0].metadata.name}') bash

2 Use argocd admin cluster kubeconfig command to export kubeconfig file from the configured Secret:

  1. argocd admin cluster kubeconfig https://<api-server-url> /tmp/kubeconfig --namespace argocd

3 Use kubectl to get more details about connection issues, fix them and apply changes back to secret:

  1. export KUBECONFIG=/tmp/kubeconfig
  2. kubectl get pods -v 9