Introduction
- JS7 can be set up for use with a Helm Chart. Using the Linux-based JS7 images for Docker® containers which ship with a current Alpine base image and OpenJDK.
- Docker® images for JS7 are publicly available from https://hub.docker.com/r/sosberlin/js7.
- Deploying containers using Kubernetes Cluster is publicly available from JS7 - How to deploy to a Kubernetes Cluster.
- Instructions on how to run containers for JS7 components can be found in the JS7 - Installation for Docker Containers article series.
- Users deploy JS7 components by creating a Kubernetes deployment object from a deployment YAML file.
- For this purpose, users have to first install and set up the Kubernetes Cluster see JS7 - How to install a Kubernetes Cluster.
- With the Helm Chart being up and running users can use values YAML files to deploy JS7 components.
Deployment Files
The YAML sample files for deployment to Kubernetes using Helm are attached to the article.
Download the archive file: buildachart_js7_working.zip
The archive includes the following files.
Deployment of JS7 Components: js7-deployment.yaml
js7-deplotment.yaml
apiVersion: apps/v1 kind: Deployment metadata: name: {{ include "buildachart.fullname" . }} labels: {{- include "buildachart.labels" . | nindent 4 }} spec: {{- if not .Values.autoscaling.enabled }} replicas: {{ .Values.replicaCount }} {{- end }} selector: matchLabels: {{- include "buildachart.selectorLabels" . | nindent 6 }} template: metadata: {{- with .Values.podAnnotations }} annotations: {{- toYaml . | nindent 8 }} {{- end }} labels: {{- include "buildachart.selectorLabels" . | nindent 8 }} spec: {{- with .Values.imagePullSecrets }} imagePullSecrets: {{- toYaml . | nindent 8 }} {{- end }} serviceAccountName: {{ include "buildachart.serviceAccountName" . }} securityContext: {{- toYaml .Values.podSecurityContext | nindent 8 }} volumes: - name: hibernate-config configMap: name: hibernate-config containers: - name: {{ .Chart.Name }} securityContext: {{- toYaml .Values.securityContext | nindent 12 }} image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}" imagePullPolicy: {{ .Values.image.pullPolicy }} ports: - name: http containerPort: {{ .Values.service.port }} protocol: TCP volumeMounts: - name: hibernate-config mountPath: /var/sos-berlin.com/js7/joc/resources/joc/ - name: js7con image: "{{ .Values.imageController.repository }}:{{ .Values.imageController.tag | default .Chart.AppVersion }}" ports: - name: http containerPort: {{ .Values.serviceController.port }} protocol: TCP - name: js7ag image: "{{ .Values.imageAgent.repository }}:{{ .Values.imageAgent.tag | default .Chart.AppVersion }}" ports: - name: http containerPort: {{ .Values.serviceAgent.port }} protocol: TCP 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 }}
The YAML file describes a single Pod for deployment to Kubernetes which is a group of one or more containers and a ConfigMap. The Pod includes three containers:
- The
js7joc
container runs thejoc-2-5-1
image and exposes port4446
. It uses a ConfigMap with the namehibernate-config
to specify a volume mounted to the/var/sos-berlin.com/js7/joc/resources/joc
directory. - The
js7con
container runs thecontroller-2-5-1
image and exposes port4444
. - The
js7agent
container runs theagent-2-5-1
image and exposes port4445.
The following implications apply:
- Each container runs a different image from the
sosberlin/js7
repository and is assigned a unique port. For the
js7joc
container the volumeMounts element specifies thehibernate-config
ConfigMap which is mounted to the/var/sos-berlin.com/js7/joc/resources/joc
directory.
Values for Kubernetes JS7 deployment file: js7-service.yaml
Example for values.yaml
replicaCount: 1 image: repository: sosberlin/js7 pullPolicy: IfNotPresent tag: "joc-2-5-1" imageController: repository: sosberlin/js7 pullPolicy: IfNotPresent tag: "controller-2-5-1" imageAgent: repository: sosberlin/js7 pullPolicy: IfNotPresent tag: "agent-2-5-1" imagePullSecrets: [] nameOverride: "" fullnameOverride: "" serviceAccount: create: true annotations: {} name: "" podAnnotations: {} podSecurityContext: {} securityContext: {} service: type: ClusterIP port: 4446 serviceController: type: ClusterIP port: 4444 serviceAgent: type: ClusterIP port: 4445 ingress: enabled: false className: "" annotations: {} hosts: - host: chart-example.local paths: - path: / pathType: ImplementationSpecific tls: [] resources: {} autoscaling: enabled: false minReplicas: 1 maxReplicas: 100 targetCPUUtilizationPercentage: 80 nodeSelector: {} tolerations: [] affinity: {}
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