Lab13 Complete

k8s/ARGOCD.md

@@ -0,0 +1,105 @@
+# ArgoCD Setup
+### Installation verification
+```bash
+kubectl get pods --namespace argocd
+```
+```text
+NAME                                                READY   STATUS    RESTARTS       AGE
+argocd-application-controller-0                     1/1     Running   0              78m
+argocd-applicationset-controller-559566846f-shch5   1/1     Running   0              78m
+argocd-dex-server-8f5687997-8t499                   1/1     Running   0              78m
+argocd-notifications-controller-56c7d65875-jbhv2    1/1     Running   0              78m
+argocd-redis-fcd76bcfb-x97cm                        1/1     Running   0              78m
+argocd-repo-server-7b8447858f-2vcj4                 1/1     Running   26 (10m ago)   78m
+argocd-server-7f857f54f-m56tl                       1/1     Running   0              78m
+```
+
+### UI access method
+![Argo UI](/k8s/screenshots/argo_ui.png)
+
+### CLI configuration
+![Argo UI](/k8s/screenshots/argo_cli_config.png)
+
+# Application Configuration
+### Application manifests
+Complete listing:
+```yaml
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: python-app
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/Error10556/DevOps-Core-Course.git
+    targetRevision: lab13
+    path: k8s/dinfochart
+    helm:
+      valueFiles:
+        - values.yaml
+        - values-dev.yaml
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: default
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true
+```
+
+# Multi-Environment
+### Dev vs Prod configuration differences
+The only differences are shown below:
+
+```diff
+--- argocd/application-dev.yaml	2026-04-23 19:12:06.412196521 +0300
++++ argocd/application-prod.yaml	2026-04-23 19:25:09.577043976 +0300
+@@ -12,13 +12,10 @@
+     helm:
+       valueFiles:
+         - values.yaml
+-        - values-dev.yaml
++        - values-prod.yaml
+   destination:
+     server: https://kubernetes.default.svc
+-    namespace: dev
++    namespace: prod
+   syncPolicy:
+-    automated:
+-      prune: true
+-      selfHeal: true
+     syncOptions:
+       - CreateNamespace=true
+```
+
+### Sync policy differences and rationale
+In production, automatic syncing may be dangerous. Syncing should be done manually when the team knows that the system
+is stable (for example, if the staging environment rolled out fine).
+
+### Namespace separation
+The development version of the app deployment will be located in the `dev` namespace, and the production will be in the
+`prod` namespace to ensure no collisions.
+
+# Self-Healing Evidence
+### Manual scale test with before/after
+For example, assuming that the dev application is launched:
+```bash
+kubectl scale deployment devops-infoservice -n dev --replicas=2
+```
+After this, `argocd` automatically resets the replica count to 1.
+
+### Pod deletion test
+Kubernetes restarts deleted pods on its own, I think, but still:
+```bash
+kubectl delete pods/python-app-dinfochart-6d448c7957-cxjxj
+```
+
+This command just resets the alive time counter.
+
+### Explanation of behaviors
+ArgoCD automatically detects differences between the desired state and the real state of the deployment and can sync it
+back to the desired state.
+
+# Screenshots
+
+See above.

k8s/argocd/application-dev.yaml

@@ -0,0 +1,24 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: python-app-dev
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/Error10556/DevOps-Core-Course.git
+    targetRevision: lab13
+    path: k8s/dinfochart
+    helm:
+      valueFiles:
+        - values.yaml
+        - values-dev.yaml
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: dev
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true

k8s/argocd/application-prod.yaml

@@ -0,0 +1,21 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: python-app-dev
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/Error10556/DevOps-Core-Course.git
+    targetRevision: lab13
+    path: k8s/dinfochart
+    helm:
+      valueFiles:
+        - values.yaml
+        - values-prod.yaml
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: prod
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true

k8s/argocd/application.yaml

@@ -0,0 +1,21 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: python-app
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/Error10556/DevOps-Core-Course.git
+    targetRevision: lab13
+    path: k8s/dinfochart
+    helm:
+      valueFiles:
+        - values.yaml
+        - values-dev.yaml
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: default
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true