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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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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:
    ...
    ...

...

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

$ kkubectl 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

...

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

...

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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