Revision as of 15:43, 3 August 2020

Soon to be changed - a Helm chart is being made to handle this

The following set of files works with release 20.01 and later for a manual build and containerizing an already configured database. If you use local file authentication, you need to modify the Dockerfile to copy over your .htaccess file, accordingly. If you are unsure what that is, I point back to the header at the top of this page - this is pre-release, work-in-process. Don't distract developers from actually completing work by asking them how to do things that they are trying to automate in the first place.

You should migrate your /pictures and /drawings folders to shared storage, such as NFS, which is used in the example deployment.yaml file. You will then change your paths in the openDCIM Configuration tab to assets/pictures and assets/drawings, and then run the

Deploying to Kubernetes

Periodic (CRON) Jobs

Containers don't run the full set of background daemons, so there is no cron running in the openDCIM container. However, Kubernetes has a built-in function that will allow you to run periodic jobs. Here are some sample ones, which assume that you store the configuration environment variables in a secret named 'dcim'.

poll-temp-sensors.yaml

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: poll-temp-sensors
spec:
  schedule: "*/15 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: opendcim-sensors
            image: opendcim/opendcim:20.01
            args:
            - /usr/bin/php
            - /var/www/html/poll_temperature_sensors.php
            envFrom:
            - secretRef:
                name: dcim
          restartPolicy: Never

poll-pdu-stats.yaml

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: poll-pdu-stats
spec:
  schedule: "*/15 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: opendcim-pdu
            image: opendcim/opendcim:20.01
            args:
            - /usr/bin/php
            - /var/www/html/poll_pdu_stats.php
            envFrom:
            - secretRef:
                name: dcim
          restartPolicy: Never

configmap.yaml

These are your environment variables that will change the behavior of openDCIM. They are dynamically updated, so as soon as you make a change in the configMap, it will change the values in the running containers.

apiVersion: v1
kind: ConfigMap
metadata:
  name: opendcim
  namespace: opendcim
data:
  OPENDCIM_DB_HOST: mysql
  OPENDCIM_DB_NAME: dcim
  OPENDCIM_DB_PASS: dcim
  OPENDCIM_DB_USER: dcim
  OPENDCIM_AUTH_METHOD: "LDAP"
  OPENDCIM_DEVMODE: "FALSE"

service.yaml

This defines a service so that it can be exposed through a LoadBalancer or, in this example, an ingress rule.

apiVersion: v1
kind: Service
metadata:
  name: opendcim-svc
  namespace: opendcim
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    name: http
  selector:
    app: opendcim

ingress.yaml

Definition of the inbound rule for ingress to the service. Swap out dcim.YOURDOMAIN.COM with the URL you are using. This ingress rule assumes that you are running cert-manager for automatic certificate management. Adjust accordingly.

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    certmanager.k8s.io/cluster-issuer: ca-issuer
    kubernetes.io/ingress.class: nginx
    nginx.org/ssl-services: opendcim-service
  name: opendcim-ingress
  namespace: opendcim
spec:
  rules:
  - host: dcim.YOURDOMAIN.COM
    http:
      paths:
      - backend:
          serviceName: opendcim-svc
          servicePort: 80
        path: /
  tls:
  - hosts:
    - dcim.YOURDOMAIN.COM
    secretName: opendcim-tls

cert.yaml

This only works if you have CertManager installed and running in your Kubernetes cluster, otherwise you have to follow documentation on how to add the opendcim-tls secret the old fashioned way.

apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: dcim.YOURDOMAIN.COM
  namespace: opendcim
spec:
  secretName: opendcim-tls
  issuerRef:
    name: ca-issuer
    kind: ClusterIssuer
  commonName: dcim.YOURDOMAIN.COM
  dnsNames:
  - dcim.YOURDOMAIN.COM

deployment.yaml

This is the main controller. Suggested minimum of 2 replicas for some level of fault tolerance, but that is only useful if your MySQL/Maria database is a fault-tolerant cluster. There are plenty of example online for how to set up a Galera cluster, including some in Kubernetes.

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: opendcim
  name: opendcim-deployment
spec:
  replicas: 2
  revisionHistoryLimit: 5
  selector:
    matchLabels:
      app: opendcim
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: opendcim
    spec:
      containers:
      - envFrom:
        - configMapRef:
            name: opendcim
        image: MY_REPO/opendcim:latest
        imagePullPolicy: Always
        name: opendcim
        ports:
        - containerPort: 80
          protocol: TCP
        resources:
          limits:
            cpu: "2"
            memory: 2Gi
          requests:
            cpu: "1"
            memory: 512Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: FallbackToLogsOnError
        volumeMounts:
        - mountPath: /var/www/html/assets
          name: opendcim-persistent-storage
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      terminationGracePeriodSeconds: 30
      volumes:
      - name: opendcim-persistent-storage
        nfs:
          path: /opendcim-data
          server: nfs-server.yourdomain.com