Add exec-host

helmcharts/TestApp/TestApp.Cli-Exec-Host.Dockerfile

@@ -0,0 +1,28 @@
+# Build standard .NET Core application
+FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS builder
+WORKDIR /app
+
+# WARNING: This is completely unoptimised!
+COPY . .
+
+# Publish the CLI project to the path /app/output/cli
+RUN dotnet publish ./src/TestApp.Cli -c Release -o /app/output/cli
+
+###################
+
+# Runtime image 
+FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-alpine
+
+# Copy the background script that keeps the pod alive
+WORKDIR /background
+COPY ./keep_alive.sh ./keep_alive.sh
+# Ensure the file is executable
+RUN chmod +x /background/keep_alive.sh
+
+# Set the command that runs when the pod is started
+CMD "/background/keep_alive.sh"
+
+WORKDIR /app
+
+# Copy the CLI tool into this container
+COPY --from=builder ./app/output/cli .

helmcharts/TestApp/build_and_deploy.sh

@@ -12,6 +12,7 @@ CHART="./charts/test-app" \
 RELEASE_NAME="my-test-app-release" \
 NAMESPACE="local" \
 HELM_ARGS="--set test-app-cli.image.tag=$1 \
+  --set test-app-cli-exec-host.image.tag=$1 \
   --set test-app-api.image.tag=$1 \
   --set test-app-service.image.tag=$1 \
 " \

helmcharts/TestApp/charts/test-app/Chart.yaml

@@ -15,7 +15,7 @@ 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: 0.1.1
+version: 0.1.2
 
 # 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

helmcharts/TestApp/charts/test-app/charts/test-app-cli-exec-host/Chart.yaml

@@ -0,0 +1,23 @@
+apiVersion: v2
+name: test-app-cli-exec-host
+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: 0.1.0
+
+# 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.
+appVersion: 1.16.0

helmcharts/TestApp/charts/test-app/charts/test-app-cli-exec-host/templates/_helpers.tpl

@@ -0,0 +1,62 @@
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "test-app-cli-exec-host.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "test-app-cli-exec-host.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "test-app-cli-exec-host.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "test-app-cli-exec-host.labels" -}}
+helm.sh/chart: {{ include "test-app-cli-exec-host.chart" . }}
+{{ include "test-app-cli-exec-host.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "test-app-cli-exec-host.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "test-app-cli-exec-host.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "test-app-cli-exec-host.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "test-app-cli-exec-host.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

helmcharts/TestApp/charts/test-app/charts/test-app-cli-exec-host/templates/deployment.yaml

@@ -0,0 +1,53 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "test-app-cli-exec-host.fullname" . }}
+  labels:
+    {{- include "test-app-cli-exec-host.labels" . | nindent 4 }}
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      {{- include "test-app-cli-exec-host.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+    {{- with .Values.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+      labels:
+        {{- include "test-app-cli-exec-host.selectorLabels" . | nindent 8 }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      serviceAccountName: {{ include "test-app-cli-exec-host.serviceAccountName" . }}
+      securityContext:
+        {{- toYaml .Values.podSecurityContext | nindent 8 }}
+      containers:
+        - name: {{ .Chart.Name }}
+          securityContext:
+            {{- toYaml .Values.securityContext | nindent 12 }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          env:
+          {{- $env := merge (.Values.env | default dict) (.Values.global.env | default dict) -}}
+          {{ range $k, $v := $env }}
+            - name: {{ $k | quote }}
+              value: {{ $v | quote }}
+          {{- end }}
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}

helmcharts/TestApp/charts/test-app/values.yaml

@@ -15,6 +15,16 @@ test-app-cli:
     ## Should the job be rescheduled on the same node if it fails, or just stopped
     restartPolicy: Never
 
+test-app-cli-exec-host:
+
+  image:
+    repository: andrewlock/my-test-cli-exec-host
+    pullPolicy: IfNotPresent
+    tag: ""
+
+  serviceAccount:
+    create: false
+
 test-app-api:
 
   replicaCount: 1

helmcharts/TestApp/docker_build.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+set -eu
 
 # in case we are being run from outside this directory
 cd "$(dirname "$0")"
@@ -9,5 +10,6 @@ if [ -z "$*" ]; then
 fi
 
 docker build -f TestApp.Cli.Dockerfile . -t andrewlock/my-test-cli:$1
+docker build -f TestApp.Cli-Exec-Host.Dockerfile . -t andrewlock/my-test-cli-exec-host:$1
 docker build -f TestApp.Api.Dockerfile . -t andrewlock/my-test-api:$1
 docker build -f TestApp.Service.Dockerfile . -t andrewlock/my-test-service:$1

helmcharts/TestApp/keep_alive.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# https://superuser.com/a/1299463
+die_func() {
+    echo "Terminating"
+    exit 1
+}
+
+trap die_func TERM
+
+echo "Sleeping..."
+# restarts once a day
+sleep 86400 &
+wait

helmcharts/TestApp/src/TestApp.Cli/Program.cs

@@ -7,8 +7,16 @@ class Program
     {
         static void Main(string[] args)
         {
-            Thread.Sleep(30_000);
-            Console.WriteLine("Hello World!");
+            if(args.Length > 0 && args[0] == "say-hello")
+            {
+                Console.WriteLine("Hello world!");
+            }
+            else
+            {
+                Console.WriteLine("Running migrations...");
+                Thread.Sleep(30_000);
+                Console.WriteLine("Mmigrations complete!");
+            }
         }
     }
 }