Jimmy的文檔： openshift origin ConfigMaps

Openshift Origin ConfigMaps

ConfigMaps 是openshift提供的一種管理配置參數的工具，在容器運行過程中，需要配置很多變量和參數，這些變量和參數可能隨時都有變化，因此這些變量不適合保存在容器中，若保存在容器中，需要經常替換鏡像，維護成本高；再者，應用使用過程中，需要進行環境的遷移，變量和參數需要備份和移植到別的平臺，需要有一種簡單、快速的變量和參數的移植方式，這種方式在openshift中就是configMaps。

下面是一個簡單的configMaps的配置文件：

kind: ConfigMap
apiVersion: v1
metadata:
  creationTimestamp: 2016-02-18T19:14:38Z
  name: example-config
  namespace: default
data: 
  example.property.1: hello
  example.property.2: world
  example.property.file: |-
    property.1=value-1
    property.2=value-2
    property.3=value-3

1. ConfigMaps創建

1）基於目錄創建

假設有目錄example-files，目錄下有如下文件：

$ ls example-files
game.properties
ui.properties

$ cat example-files/game.properties
enemies=aliens
lives=3
enemies.cheat=true
enemies.cheat.level=noGoodRotten
secret.code.passphrase=UUDDLRLRBABAS
secret.code.allowed=true
secret.code.lives=30

$ cat example-files/ui.properties
color.good=purple
color.bad=yellow
allow.textmode=true
how.nice.to.look=fairlyNice

針對上述目錄創建和查看的操作如下：

# oc create configmap game-config --from-file=example-files/
configmap "game-config" created

# oc describe configmaps game-config
Name:         game-config
Namespace:    configmaps
Labels:       <none>
Annotations:  <none>

Data
====
game.properties:
----
enemies=aliens
lives=3
enemies.cheat=true
enemies.cheat.level=noGoodRotten
secret.code.passphrase=UUDDLRLRBABAS
secret.code.allowed=true
secret.code.lives=30

ui.properties:
----
color.good=purple
color.bad=yellow
allow.textmode=true
how.nice.to.look=fairlyNice

Events:  <none>

# oc get  configmaps game-config -o yaml
apiVersion: v1
data:
  game.properties: |
    enemies=aliens
    lives=3
    enemies.cheat=true
    enemies.cheat.level=noGoodRotten
    secret.code.passphrase=UUDDLRLRBABAS
    secret.code.allowed=true
    secret.code.lives=30
  ui.properties: |
    color.good=purple
    color.bad=yellow
    allow.textmode=true
    how.nice.to.look=fairlyNice
kind: ConfigMap
metadata:
  creationTimestamp: 2018-06-07T11:56:50Z
  name: game-config
  namespace: configmaps
  resourceVersion: "3882446"
  selfLink: /api/v1/namespaces/configmaps/configmaps/game-config
  uid: dcee28c2-6a49-11e8-8b2d-002590c89d6e

2) 基於文件創建

# oc create configmap game-config-2     --from-file=example-files/game.properties     --from-file=example-files/ui.properties
configmap "game-config-2" created

# oc get configmaps game-config-2 -o yaml
apiVersion: v1
data:
  game.properties: |
    enemies=aliens
    lives=3
    enemies.cheat=true
    enemies.cheat.level=noGoodRotten
    secret.code.passphrase=UUDDLRLRBABAS
    secret.code.allowed=true
    secret.code.lives=30
  ui.properties: |
    color.good=purple
    color.bad=yellow
    allow.textmode=true
    how.nice.to.look=fairlyNice
kind: ConfigMap
metadata:
  creationTimestamp: 2018-06-07T12:00:06Z
  name: game-config-2
  namespace: configmaps
  resourceVersion: "3882833"
  selfLink: /api/v1/namespaces/configmaps/configmaps/game-config-2
  uid: 51949ecd-6a4a-11e8-8b2d-002590c89d6e

3）基於key-value的文件創建

# oc create configmap game-config-3  --from-file=game-special-key=example-files/game.properties
configmap "game-config-3" created

# oc get configmaps game-config-3 -o yaml
apiVersion: v1
data:
  game-special-key: |
    enemies=aliens
    lives=3
    enemies.cheat=true
    enemies.cheat.level=noGoodRotten
    secret.code.passphrase=UUDDLRLRBABAS
    secret.code.allowed=true
    secret.code.lives=30
kind: ConfigMap
metadata:
  creationTimestamp: 2018-06-07T12:04:20Z
  name: game-config-3
  namespace: configmaps
  resourceVersion: "3883335"
  selfLink: /api/v1/namespaces/configmaps/configmaps/game-config-3
  uid: e9462ee8-6a4a-11e8-8b2d-002590c89d6e

4）基於文字值的創建

# oc create configmap special-config     --from-literal=special.how=very     --from-literal=special.type=charm
configmap "special-config" created

# oc get configmaps special-config -o yaml
apiVersion: v1
data:
  special.how: very
  special.type: charm
kind: ConfigMap
metadata:
  creationTimestamp: 2018-06-07T12:07:58Z
  name: special-config
  namespace: configmaps
  resourceVersion: "3883764"
  selfLink: /api/v1/namespaces/configmaps/configmaps/special-config
  uid: 6b087a3b-6a4b-11e8-8b2d-002590c89d6e

5）基於yaml文件創建

# cat env-config.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: env-config 
  namespace: configmaps
data:
  log_level: INFO

# oc create -f env-config.yaml 
configmap "env-config" created

# cat special-config.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: special-config 
  namespace: configmaps
data:
  special.how: very 
  special.type: charm 

# oc create -f special-config.yaml 
configmap "special-config" created

# oc get configmaps
NAME             DATA      AGE
env-config       1         7m
special-config   2         7m

2. ConfigMaps 使用

1) 配置環境變量

# cat pod.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod
spec:
  containers:
    - name: test-container
      image:  docker.io/busybox:latest
      command: [ "/bin/sh", "-c", "env" ]
      env: 
        - name: SPECIAL_LEVEL_KEY
          valueFrom:
            configMapKeyRef:
              name: special-config 
              key: special.how 
        - name: SPECIAL_TYPE_KEY
          valueFrom:
            configMapKeyRef:
              name: special-config 
              key: special.type 
              optional: true 
          envFrom:
          - configMapRef:
              name: env-config 
  restartPolicy: Never


# oc create -f pod.yaml 
pod "dapi-test-pod" created

# oc get pods
NAME            READY     STATUS      RESTARTS   AGE
dapi-test-pod   0/1       Completed   0          29s

# oc logs dapi-test-pod 
KUBERNETES_SERVICE_PORT=443
KUBERNETES_PORT=tcp://172.30.0.1:443
HOSTNAME=dapi-test-pod
SHLVL=1
HOME=/root
KUBERNETES_PORT_53_TCP_ADDR=172.30.0.1
KUBERNETES_PORT_53_UDP_ADDR=172.30.0.1
KUBERNETES_PORT_53_TCP_PORT=53
KUBERNETES_PORT_53_TCP_PROTO=tcp
SPECIAL_TYPE_KEY=charm
KUBERNETES_PORT_53_UDP_PORT=53
KUBERNETES_PORT_53_UDP_PROTO=udp
KUBERNETES_SERVICE_PORT_DNS=53
KUBERNETES_PORT_53_TCP=tcp://172.30.0.1:53
KUBERNETES_PORT_443_TCP_ADDR=172.30.0.1
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
KUBERNETES_PORT_53_UDP=udp://172.30.0.1:53
KUBERNETES_PORT_443_TCP_PORT=443
KUBERNETES_PORT_443_TCP_PROTO=tcp
SPECIAL_LEVEL_KEY=very
KUBERNETES_SERVICE_PORT_DNS_TCP=53
KUBERNETES_PORT_443_TCP=tcp://172.30.0.1:443
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_SERVICE_HOST=172.30.0.1
PWD=/

發現環境變量SPECIAL_TYPE_KEY 和SPECIAL_LEVEL_KEY

2) Volume 使用configmaps

# oc get configmaps special-config -o yaml
apiVersion: v1
data:
  special.how: very
  special.type: charm
kind: ConfigMap
metadata:
  creationTimestamp: 2018-06-07T12:11:55Z
  name: special-config
  namespace: configmaps
  resourceVersion: "3884236"
  selfLink: /api/v1/namespaces/configmaps/configmaps/special-config
  uid: f873c69b-6a4b-11e8-8b2d-002590c89d6e

# cat volumepod.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod
spec:
  containers:
    - name: test-container
      image: docker.io/busybox:latest
      command: [ "/bin/sh", "cat", "/etc/config/special.how" ]
      volumeMounts:
      - name: config-volume
        mountPath: /etc/config
  volumes:
    - name: config-volume
      configMap:
        name: special-config
  restartPolicy: Never

# oc create -f volumepod.yaml 
pod "dapi-test-pod" created

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