homework 13.4: complete first task, partially complete 2 task

readme.md

@@ -44,7 +44,7 @@
 * [08.6. Создание собственных modules](/src/homework/08-ansible/8.6)
 * [09.1. Жизненный цикл ПО](/src/homework/09-ci/9.1)
 * [09.3. CI\CD](/src/homework/09-ci/9.3)
-* [09.4 Jenkins](/src/homework/09-ci/9.4)
+* [09.4. Jenkins](/src/homework/09-ci/9.4)
 * [09.5. Teamcity](/src/homework/09-ci/9.5)
 * [09.6. Gitlab](/src/homework/09-ci/9.6)
 * [10.1. Зачем и что нужно мониторить](/src/homework/10-monitoring/10.1)
@@ -65,3 +65,4 @@
 * [13.1. контейнеры, поды, deployment, statefulset, services, endpoints](/src/homework/13-kubernates-config/13.1)
 * [13.2. разделы и монтирование](/src/homework/13-kubernates-config/13.2)
 * [13.3. работа с kubectl](/src/homework/13-kubernates-config/13.3)
+* [13.4. инструменты для упрощения написания конфигурационных файлов. Helm и Jsonnet](/src/homework/13-kubernates-config/13.4)

src/homework/13-kubernates-config/13.4/project/.helmignore

@@ -0,0 +1,23 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

src/homework/13-kubernates-config/13.4/project/Chart.yaml

@@ -0,0 +1,24 @@
+apiVersion: v2
+name: project
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 1.0.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.0.0"

src/homework/13-kubernates-config/13.4/project/templates/NOTES.txt

@@ -0,0 +1,6 @@
+---------------------------------------------------------
+
+Content of NOTES.txt appears after deploy.
+Deployed version {{ .Chart.AppVersion }}.
+
+---------------------------------------------------------

src/homework/13-kubernates-config/13.4/project/templates/backend_deployment.yaml

@@ -0,0 +1,34 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: backend
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-backend
+  namespace: {{ .Values.namespace }}
+spec:
+  replicas: {{ .Values.backend.replicasCount }}
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}-{{ .Values.environment }}
+      service: backend
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}-{{ .Values.environment }}
+        service: backend
+    spec:
+      containers:
+        - image: {{ .Values.image.name }}:backend-latest
+          imagePullPolicy: Always
+          name: backend
+          env:
+            - name: DATABASE_URL
+              value: "postgresql://{{ .Values.database.settings.user }}:{{ .Values.database.settings.password }}@postgres:5432/{{ .Values.database.settings.dbName }}"
+          ports:
+            - name: web
+              containerPort: 9000
+          resources:
+            {{- toYaml .Values.backend.resources | nindent 12 }}
+      terminationGracePeriodSeconds: 30

src/homework/13-kubernates-config/13.4/project/templates/backend_service.yaml

@@ -0,0 +1,13 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-backend
+  namespace: {{ .Values.namespace }}
+spec:
+  ports:
+    - name: web
+      port: 9000
+  selector:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: backend

src/homework/13-kubernates-config/13.4/project/templates/database_configmap.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-config
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: database
+  namespace: {{ .Values.namespace }}
+data:
+  POSTGRES_DB: {{ .Values.database.settings.dbName }}
+  POSTGRES_USER: {{ .Values.database.settings.user }}
+  POSTGRES_PASSWORD: {{ .Values.database.settings.password }}
+  PGDATA: {{ .Values.database.settings.dbPath | quote }}

src/homework/13-kubernates-config/13.4/project/templates/database_pv.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-pv-volume
+  labels:
+    type: local
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: database
+  namespace: {{ .Values.namespace }}
+spec:
+  storageClassName: manual
+  capacity:
+    storage: 1Gi
+  accessModes:
+    - ReadWriteMany
+  hostPath:
+    path: {{ .Values.database.hostVolumePath | quote }}

src/homework/13-kubernates-config/13.4/project/templates/database_pvc.yaml

@@ -0,0 +1,16 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-pv-claim
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: database
+  namespace: {{ .Values.namespace }}
+spec:
+  storageClassName: manual
+  accessModes:
+    - ReadWriteMany
+  resources:
+    requests:
+      storage: 1Gi

src/homework/13-kubernates-config/13.4/project/templates/database_service.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-database
+  namespace: {{ .Values.namespace }}
+spec:
+  type: ClusterIP
+  clusterIP: None
+  ports:
+    - name: {{ .Chart.Name }}-{{ .Values.environment }}-postgresql
+      port: 5432
+      targetPort: 5432
+      protocol: TCP
+  selector:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: database
+    db-kind: postgresql

src/homework/13-kubernates-config/13.4/project/templates/database_statefulset.yaml

@@ -0,0 +1,47 @@
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: database
+    db-kind: postgresql
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-database
+  namespace: {{ .Values.namespace }}
+spec:
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}-{{ .Values.environment }}
+      service: database
+      db-kind: postgresql
+  serviceName: postgres
+  replicas: 1
+  podManagementPolicy: "Parallel"
+  updateStrategy:
+    type: "RollingUpdate"
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}-{{ .Values.environment }}
+        service: database
+        db-kind: postgresql
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+        - name: postgres
+          image: postgres:13-alpine
+          imagePullPolicy: "IfNotPresent"
+          ports:
+            - name: postgresql
+              containerPort: 5432
+              protocol: TCP
+          envFrom:
+            - configMapRef:
+                name: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-config
+          volumeMounts:
+            - mountPath: {{ .Values.database.settings.dbPath | quote }}
+              name: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-volume
+      volumes:
+        - name: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-volume
+          persistentVolumeClaim:
+            claimName: {{ .Chart.Name }}-{{ .Values.environment }}-postgres-pv-claim

src/homework/13-kubernates-config/13.4/project/templates/frontend_deployment.yaml

@@ -0,0 +1,34 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: frontend
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-frontend
+  namespace: {{ .Values.namespace }}
+spec:
+  replicas: {{ .Values.frontend.replicasCount }}
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}-{{ .Values.environment }}
+      service: frontend
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}-{{ .Values.environment }}
+        service: frontend
+    spec:
+      containers:
+        - image: {{ .Values.image.name }}:frontend-latest
+          imagePullPolicy: Always
+          name: frontend
+          env:
+            - name: BASE_URL
+              value: "http://{{ .Chart.Name }}-{{ .Values.environment }}-backend:9000"
+          ports:
+            - name: web
+              containerPort: 80
+          resources:
+            {{- toYaml .Values.frontend.resources | nindent 12 }}
+      terminationGracePeriodSeconds: 30

src/homework/13-kubernates-config/13.4/project/values.yaml

@@ -0,0 +1,33 @@
+environment: production
+namespace: app1
+
+image:
+  name: dannecron/netology-devops-k8s-app
+
+backend:
+  replicasCount: 1
+  resources:
+    limits:
+      cpu: 200m
+      memory: 256Mi
+    requests:
+      cpu: 100m
+      memory: 128Mi
+
+frontend:
+  replicasCount: 1
+  resources:
+    limits:
+      cpu: 200m
+      memory: 256Mi
+    requests:
+      cpu: 100m
+      memory: 128Mi
+
+database:
+  settings:
+    user: db_user
+    password: db_passwd
+    dbName: news
+    dbPath: "/var/lib/postgresql/data"
+  hostVolumePath: "/mnt/pgsql_data"

src/homework/13-kubernates-config/13.4/readme.md

@@ -0,0 +1,150 @@
+Выполнение [домашнего задания](https://github.com/netology-code/devkub-homeworks/blob/main/13-kubernetes-config-04-helm.md)
+по теме "13.4. инструменты для упрощения написания конфигурационных файлов. Helm и Jsonnet"
+
+## Q/A
+
+> В работе часто приходится применять системы автоматической генерации конфигураций.
+> Для изучения нюансов использования разных инструментов нужно попробовать упаковать приложение каждым из них.
+
+### Задание 1
+
+> Подготовить helm чарт для приложения.
+>
+> Необходимо упаковать приложение в чарт для деплоя в разные окружения. Требования:
+> * каждый компонент приложения деплоится отдельным deployment’ом/statefulset’ом;
+> * в переменных чарта измените образ приложения для изменения версии.
+
+Helm-чарт находится в директории [project](./project). Каждый компонент приложения выделен в отдельный шаблон.
+
+Различные переменные вынесены в файл [values.yaml](./project/values.yaml).
+
+### Задание 2
+
+> Запустить 2 версии в разных неймспейсах.
+>
+> Подготовив чарт, необходимо его проверить. Попробуйте запустить несколько копий приложения:
+> * одну версию в namespace=app1;
+> * вторую версию в том же неймспейсе;
+> * третью версию в namespace=app2. 
+
+Перед выполнением команд `helm`, необходимо создать новый неймспейс `app1` в кластере. Для этого нужно выполнить следующую команду:
+
+```shell
+kubectl create namespace app1
+```
+
+И убедиться, что новые неймспесы есть в списке:
+
+```shell
+kubectl get ns
+```
+
+```text
+NAME              STATUS   AGE
+app1              Active   66s
+default           Active   35m
+kube-node-lease   Active   35m
+kube-public       Active   35m
+kube-system       Active   35m
+```
+
+По умолчанию задан `namespace=app1`, таким образом для деплоя chart необходимо выполнить команду:
+
+```shell
+helm install netology-project project
+```
+
+```text
+NAME: netology-project
+LAST DEPLOYED: Mon Dec 19 10:36:23 2022
+NAMESPACE: default
+STATUS: deployed
+REVISION: 1
+TEST SUITE: None
+NOTES:
+---------------------------------------------------------
+
+Content of NOTES.txt appears after deploy.
+Deployed version 1.0.0.
+
+---------------------------------------------------------
+```
+
+Следующим шагом нужно проверить, что chart появился в списке:
+
+```shell
+helm list
+```
+
+```text
+NAME                    NAMESPACE       REVISION        UPDATED                                 STATUS CHART            APP VERSION
+netology-project        default         1               2022-12-19 10:36:23.9408923 +0700 +07   deployeproject-1.0.0    1.0.0
+```
+
+И что все поды запустились:
+
+```shell
+kubectl get po --namespace app1
+```
+
+```text
+NAME                                           READY   STATUS    RESTARTS   AGE
+database-0                                     1/1     Running   0          113s
+project-production-backend-768887dd4b-vn4ct    1/1     Running   0          113s
+project-production-frontend-74d8bb648d-w9wlz   1/1     Running   0          113s
+```
+
+Предполагается, что в том же неймспейсе необходимо развернуть данное приложение, но с другим `environment` и с количеством реплик = 2.
+Для этого нужно выполнить следующую команду:
+
+```shell
+helm install --set "environment=testing" --set "backend.replicasCount=2" netology-project-test project
+```
+
+```text
+NAME: netology-project-test
+LAST DEPLOYED: Mon Dec 19 10:51:48 2022
+NAMESPACE: default
+STATUS: deployed
+REVISION: 1
+TEST SUITE: None
+NOTES:
+---------------------------------------------------------
+
+Content of NOTES.txt appears after deploy.
+Deployed version 1.0.0.
+
+---------------------------------------------------------
+```
+
+Следующим шагом проверим состояние подов:
+
+```shell
+kubectl get po --namespace app1
+```
+
+```text
+NAME                                           READY   STATUS    RESTARTS   AGE
+database-0                                     1/1     Running   0          15m
+project-production-backend-768887dd4b-vn4ct    1/1     Running   0          15m
+project-production-frontend-74d8bb648d-w9wlz   1/1     Running   0          15m
+project-testing-backend-688cb58bdc-74k2m       1/1     Running   0          21s
+project-testing-backend-688cb58bdc-r97xv       1/1     Running   0          21s
+project-testing-database-0                     1/1     Running   0          21s
+project-testing-frontend-7648dfbcb6-th89l      1/1     Running   0          21s
+```
+
+Затем необходимо сделать деплой в новый неймспейс. Для этого необходимо выполнить команду:
+
+```shell
+helm install --set "namespace=app2" --namespace=app2 --create-namespace netology-project project
+```
+
+// todo ошибка
+> Error: INSTALLATION FAILED: rendered manifests contain a resource that already exists.
+> Unable to continue with install: PersistentVolume "project-production-postgres-pv-volume" in namespace "" exists
+> and cannot be imported into the current release: invalid ownership metadata;
+> annotation validation error: key "meta.helm.sh/release-name" must equal "netology-project-app2":
+> current value is "netology-project";
+> annotation validation error: key "meta.helm.sh/release-namespace" must equal "app2":
+> current value is "default"