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An ECD Patch is meant to provide a flexible option to define and provision Kubernetes objects that suit your system architecture, or to tailor the ECD to their preferred flavor.

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Note!

An ECD Patch is NOT the same as using the kubectl patch command. Although they are conceptually similar, they do not necessarily behave in the same way.

Introduction

The ECD patch functionality enables you to add, change, and remove certain fields and functionality that might not be supported directly in the ECD specification, from the different Kubernetes objects created by the Operator through the ECD specification. The patch and patchType fields are part of the ECD CRD structure.

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Before ECD Patch

After ECD Patch

k kubectl apply -f file.yaml

Code Block

apiVersion: mz.digitalroute.com/v1alpha1
kind: ECDeployment
metadata:
  name: ecd-test-rolling-strategy
spec:
  enabled: true
  patchType: "application/strategic-merge-patch+json"
  patch: |
    spec:
      strategy:
        type: Recreate
  image: dtr.digitalroute.com/dr/mz10:10.1.0.0-dev-20200813052033.a224284-ec
  workflows:
  - template: Default.http2
    instances:
      - name: server-1
        parameters: |
          {
            "port": 8989
          }

k kubectl get deploy ecd-test-rolling-strategy -o yaml

Code Block

apiVersion: apps/v1
kind: Deployment
metadata:
  ...
  ...
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: ecd-test-rolling-strategy
  strategy:
    type: Recreate
  template:
    ...
    ...

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In the example below, with a 3 node implementation of a Kubernetes cluster, 2 nodes are tainted color=blue and 1 node is tainted color=red. The test is to add toleration to ECD so that it will get deployed into node tainted with color=red.

Code Block

$kubectl k taint nodes kl-kube-node01.digitalroute.com kl-kube-node02.digitalroute.com color=blue:NoSchedule
node/kl-kube-node01.digitalroute.com tainted
node/kl-kube-node02.digitalroute.com tainted
$ kkubectl taint nodes kl-kube-node03.digitalroute.com color=red:NoSchedule
node/kl-kube-node03.digitalroute.com tainted

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Before ECD Patch

After ECD Patch

k kubectl apply -f file.yaml

Code Block

apiVersion: mz.digitalroute.com/v1alpha1
kind: ECDeployment
metadata:
  name: ecd-test-tolerations
spec:
  enabled: true
  patchType: "application/strategic-merge-patch+json"
  patch: |
    spec:                                 # Spec for Deployment
      template:                           # Template for Pods
        spec:                             # Spec for Pods
          tolerations:                    # Toleration added to each Pod
          - key: "color"
            value: "red"                  
            operator: "Equal"
            effect: "NoSchedule"
  image: dtr.digitalroute.com/dr/mz10:10.1.0.0-dev-20200813052033.a224284-ec
  workflows:
  - template: Default.http2
    instances:
      - name: server-1
        parameters: |
          {
            "port": 8989
          }

k kubectl get pods ecd-test-tolerations-5d646c45cd-g9x8n -o wide

Code Block
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES ecd-test-tolerations-5d646c45cd-g9x8n 1/1 Running 0 80s 10.244.2.10 kl-kube-node03.digitalroute.com <none> <none>

k kubectl describe pods ecd-test-tolerations-5d646c45cd-g9x8n| grep -i toleration

Code Block

Name:         ecd-test-tolerations-5d646c45cd-g9x8n
Labels:       ECDeployment=ecd-test-tolerations
              app=ecd-test-tolerations
Controlled By:  ReplicaSet/ecd-test-tolerations-5d646c45cd
  ecd-test-tolerations:
Tolerations:     color=red:NoSchedule
  Normal   Scheduled  5m21s  default-scheduler                         Successfully assigned castle-black/ecd-test-tolerations-5d646c45cd-g9x8n to kl-kube-node03.digitalroute.com
  Normal   Created    5m21s  kubelet, kl-kube-node03.digitalroute.com  Created container ecd-test-tolerations
  Normal   Started    5m20s  kubelet, kl-kube-node03.digitalroute.com  Started container ecd-test-tolerations

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Before ECD Patch

After ECD Patch

k kubectl apply -f file.yaml

Code Block

apiVersion: mz.digitalroute.com/v1alpha1
kind: ECDeployment
metadata:
  name: ecd-test-2
spec:
  enabled: true
  patchType: "application/strategic-merge-patch+json"
  patch: |
    spec:  
      template:              
        spec:     
          containers:
          - name: ecd-test-2
            env:
            - name: ENV 
              value: dev
  image: dtr.digitalroute.com/dr/mz10:10.1.0.0-dev-20200813052033.a224284-ec
  workflows:
  - template: Default.http2
    instances:
      - name: server-1
        parameters: |
          {
            "port": 8989
          }

kex kubectl exec ecd-test-2-7487469546-s77xx bash -- /bin/bash printenv | grep ENV

Code Block
ENV=dev

k kubectl describe pods ecd-test-2-7487469546-s77xx

Code Block

Name:         ecd-test-2-7487469546-s77xx
Namespace:    castle-black
Priority:     0
Node:         kl-kube-node03.digitalroute.com/10.60.10.143
Start Time:   Tue, 25 Aug 2020 17:05:04 +0800
Labels:       ECDeployment=ecd-test-2
              app=ecd-test-2
              pod-template-hash=7487469546
Annotations:  Status:  Running
IP:           10.244.2.14
IPs:
  IP:           10.244.2.14
Controlled By:  ReplicaSet/ecd-test-2-7487469546
Containers:
  ecd-test-2:
    Container ID:  docker://a07de37d1cfff80b7ce240d7a6d3821cea393a49b58f8a9f43f97a229efd236f
    Image:         dtr.digitalroute.com/dr/mz10:10.1.0.0-dev-20200813052033.a224284-ec
    Image ID:      docker-pullable://dtr.digitalroute.com/dr/mz10@sha256:6e5efb5bb8e526679d2e0878f5cf69011d0f8724be1dc90f26e631f33afe8227
    Port:          <none>
    Host Port:     <none>
    Command:
      /opt/mz/entrypoint/docker-entrypoint.sh
    Args:
      -e accepts.any.scheduling.criteria=false
    State:          Running
      Started:      Tue, 25 Aug 2020 17:05:05 +0800
    Ready:          True
    Restart Count:  0
    Liveness:       http-get http://:9090/health/live delay=90s timeout=10s period=15s #success=1 #failure=3
    Readiness:      http-get http://:9090/health/ready delay=0s timeout=1s period=5s #success=1 #failure=60
    Environment:
      ENV:  dev
      TZ:   UTC

...

Before ECD Patch

After ECD Patch

k kubectl apply -f file.yaml

Code Block

apiVersion: mz.digitalroute.com/v1alpha1
kind: ECDeployment
metadata:
  name: ecd-test-2
spec:
  enabled: true
  patchType: "application/strategic-merge-patch+json"
  patch: |
    spec:  
      template:              
        spec:     
          containers:
          - name: ecd-test-2
            volumeMounts:
            - mountPath: /cdr_volume
              name: cdr-volume
              $patch: delete
          volumes:
          - name: cdr-volume
            emptyDir: {}
            $patch: delete
  image: dtr.digitalroute.com/dr/mz10:10.2.0-xe-2080-bugfix-latest-ec
  workflows:
  - template: Default.http2
    instances:
      - name: server-1
        parameters: |
          {
            "port": 8989
          }

kg kubectl get pods ecd-test-2-678ccb76d6-s49ql -o yaml

Code Block

apiVersion: v1
kind: Pod
metadata:
  ...
  ...
  name: ecd-test-2-678ccb76d6-s49ql
  ...
  ...
spec:
  containers:
  - name: ecd-test-2
    ...
    ...
    volumeMounts:
    - mountPath: /etc/config/common
      name: common-config
    - mountPath: /var/run/secrets/Kubernetes.io/serviceaccount
      name: default-token-4dc54
      readOnly: true
  ...
  ...
  volumes:
  - configMap:
      defaultMode: 420
      name: common-config
    name: common-config
  - name: default-token-4dc54
    secret:
      defaultMode: 420
      secretName: default-token-4dc54
status:
  ...
  ...

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Introduction