Some time after writing the first article , where I cleverly managed jsonnet and gitlab, I realized that pipelines are certainly good, but unnecessarily difficult and inconvenient.

In most cases, a typical task is required: "generate YAML and put it in Kubernetes". Actually, this is what the Argo CD does really well.

Argo CD allows you to connect a Git repository and sync its state to Kubernetes. By default, there is support for several types of applications: Kustomize, Helm charts, Ksonnet, bare Jsonnet or just directories with YAML / JSON manifests.

This set will be enough for most users, but not for everyone. In order to meet the needs of each and every Argo CD, it is possible to use custom tooling.

First of all, I am interested in the possibility of adding support for qbec and git-crypt , which were fully discussed in the previous article.

Before proceeding with the configuration, you must first understand how the Argo CD works.

For each app added, it has two phases:

init — , : , .
generate — , YAML stream, , .

, Argo , Helm. Argo CD Helm , .

Argo Helm-, .

QBEC

Qbec jsonnet, Helm-, Argo CD Helm-, Argo CD .

qbec argocd :

Argo CD custom plugin .
argocd-repo-server.

# cm.yaml
data:
  configManagementPlugins: |
    - name: qbec
      generate:
        command: [sh, -xc]
        args: ['qbec show "$ENVIRONMENT" -S --force:k8s-namespace "$ARGOCD_APP_NAMESPACE"']

( init )

$ kubectl -n argocd patch cm/argocd-cm -p "$(cat cm.yaml)"

, init-:

# deploy.yaml
spec:
  template:
    spec:
      # 1. Define an emptyDir volume which will hold the custom binaries
      volumes:
      - name: custom-tools
        emptyDir: {}
      # 2. Use an init container to download/copy custom binaries into the emptyDir
      initContainers:
      - name: download-tools
        image: alpine:3.12
        command: [sh, -c]
        args:
        - wget -qO- https://github.com/splunk/qbec/releases/download/v0.12.2/qbec-linux-amd64.tar.gz | tar -xvzf - -C /custom-tools/
        volumeMounts:
        - mountPath: /custom-tools
          name: custom-tools
      # 3. Volume mount the custom binary to the bin directory (overriding the existing version)
      containers:
      - name: argocd-repo-server
        volumeMounts:
        - mountPath: /usr/local/bin/qbec
          name: custom-tools
          subPath: qbec
        - mountPath: /usr/local/bin/jsonnet-qbec
          name: custom-tools
          subPath: jsonnet-qbec

$ kubectl -n argocd patch deploy/argocd-repo-server -p "$(cat deploy.yaml)"

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: qbec-app
  namespace: argocd
spec:
  destination: 
    namespace: default
    server: https://kubernetes.default.svc
  project: default
  source: 
    path: examples/test-app
    targetRevision: fix-example
    plugin: 
      env: 
        - name: ENVIRONMENT
          value: dev
      name: qbec
    repoURL: https://github.com/kvaps/qbec
  syncPolicy: 
    automated: 
      prune: true

ENVIRONMENT .

, !

git-crypt

Git-crypt . git.

git-crypt .

git-crypt unlock init- custom-, , . Helm Jsonnet, GUI- (values- ).

, .

Argo CD - , -, git:

#!/bin/sh
$(dirname $0)/git.bin "$@"
ec=$?
[ "$1" = fetch ] && [ -d .git-crypt ] || exit $ec
GNUPGHOME=/app/config/gpg/keys git-crypt unlock 2>/dev/null
exit $ec

Argo CD git fetch . git-crypt unlock .

docker- :

$ kubectl -n argocd set image deploy/argocd-repo-server argocd-repo-server=docker.io/kvaps/argocd-git-crypt:v1.7.3

, Argo . gpg- :

$ kubectl exec -ti deploy/argocd-repo-server -- bash

$ printf "%s\n" \
    "%no-protection" \
    "Key-Type: default" \
    "Subkey-Type: default" \
    "Name-Real: YOUR NAME" \
    "Name-Email: YOUR EMAIL@example.com" \
    "Expire-Date: 0" \
    > genkey-batch 

$ gpg --batch --gen-key genkey-batch
gpg: WARNING: unsafe ownership on homedir '/home/argocd/.gnupg'
gpg: keybox '/home/argocd/.gnupg/pubring.kbx' created
gpg: /home/argocd/.gnupg/trustdb.gpg: trustdb created
gpg: key 8CB8B24F50B4797D marked as ultimately trusted
gpg: directory '/home/argocd/.gnupg/openpgp-revocs.d' created
gpg: revocation certificate stored as '/home/argocd/.gnupg/openpgp-revocs.d/9A1FF8CAA917CE876E2562FC8CB8B24F50B4797D.rev'

8CB8B24F50B4797D . :

$ gpg --list-keys
gpg: WARNING: unsafe ownership on homedir '/home/argocd/.gnupg'
/home/argocd/.gnupg/pubring.kbx
-------------------------------
pub   rsa3072 2020-09-04 [SC]
      9A1FF8CAA917CE876E2562FC8CB8B24F50B4797D
uid           [ultimate] YOUR NAME <YOUR EMAIL@example.com>
sub   rsa3072 2020-09-04 [E]

$ gpg --armor --export-secret-keys 8CB8B24F50B4797D

# argocd-gpg-keys-secret.yaml
apiVersion: v1
kind: Secret
metadata:
  name: argocd-gpg-keys-secret
  namespace: argocd
stringData:
  8CB8B24F50B4797D: |-
    -----BEGIN PGP PRIVATE KEY BLOCK-----

    lQVYBF9Q8KUBDACuS4p0ctXoakPLqE99YLmdixfF/QIvXVIG5uBXClWhWMuo+D0c
    ZfeyC5GvH7XPUKz1cLMqL6o/u9oHJVUmrvN/g2Mnm365nTGw1M56AfATS9IBp0HH
    O/fbfiH6aMWmPrW8XIA0icoOAdP+bPcBqM4HRo4ssbRS9y/i
    =yj11
    -----END PGP PRIVATE KEY BLOCK-----

$ kubectl apply -f argocd-gpg-keys-secret.yaml

, argocd-repo-server, deployment:

$ kubectl -n argocd edit deploy/argocd-repo-server

gpg-keys volume projected, :

   spec:
     template:
       spec:
         volumes:
         - name: gpg-keys
           projected:
             sources:
             - secret:
                 name: argocd-gpg-keys-secret
             - configMap:
                 name: argocd-gpg-keys-cm

Argo CD gpg- , .

$ kubectl -n argocd exec -ti deploy/argocd-repo-server -- bash
$ GNUPGHOME=/app/config/gpg/keys gpg --list-secret-keys
gpg: WARNING: unsafe ownership on homedir '/app/config/gpg/keys'
/app/config/gpg/keys/pubring.kbx
--------------------------------
sec   rsa2048 2020-09-05 [SC] [expires: 2021-03-04]
      ED6285A3B1A50B6F1D9C955E5E8B1B16D47FFC28
uid           [ultimate] Anon Ymous (ArgoCD key signing key) <noreply@argoproj.io>

sec   rsa3072 2020-09-03 [SC]
      9A1FF8CAA917CE876E2562FC8CB8B24F50B4797D
uid           [ultimate] YOUR NAME <YOUR EMAIL@example.com>
ssb   rsa3072 2020-09-03 [E]

, ! Argo CD .

$ GNUPGHOME=/app/config/gpg/keys gpg --armor --export 8CB8B24F50B4797D > 8CB8B24F50B4797D.pem
$ gpg --import 8CB8B24F50B4797D.pem

$ gpg --edit-key 8CB8B24F50B4797D
trust
5

argo :

$ git-crypt add-gpg-user 8CB8B24F50B4797D

Understanding Custom Tooling in Argo CD

QBEC

git-crypt

More articles: