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Kubernetes + kustomize：如何在 configMapGenerator 中使用“var”？

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Kubernetes + kustomize：如何在 configMapGenerator 中使用“var”？

在我的kustomization.yaml我有：

configMapGenerator:
  - name: nginx-config
    files:
      - nginx.conf
vars:
  - name: PHP_FPM
    objref:
      kind: Service
      name: app-service
      apiVersion: v1
    fieldref:
      fieldpath: metadata.name

然后nginx.conf我有：

    location = /index.php {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass $(PHP_FPM):9000;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME /app/index.php;
        fastcgi_param PATH_INFO $fastcgi_path_info;
    }

当我运行kustomizevar 时，它没有被替换：

❯ kustomize build kubernetes/overlays/staging | grep fastcgi_pass
2020/06/07 18:25:05 well-defined vars that were never replaced: PHP_FPM
            fastcgi_pass $(PHP_FPM):9000;

我怎样才能将我的服务名称输入nginx.conf？

答案1

根据 Nginx不支持变量在配置文件中，该文件在应用到Nginx容器之前应该进行调整。

Kustomize 瓦尔斯仅允许特定的地方而ConfigMap.data目前还不是其中之一。

错误告诉您PHP_FPM变量已定义kustomization.yaml但从未用于替换。链接1 链接2

nginx.conf尽管如此，可以通过使用 调整内容Init Container然后将其安装到 来解决该问题Main container。

例子：

kustomization.yaml：

resources:
- cm-init-pod.yaml
- svc.yaml

patches:
- patch.yaml

configMapGenerator:
  - name: mymap
    files:
      - nginx.conf
vars:
  - name: PHP_FPM
    objref:
      kind: Service
      name: app-service
      apiVersion: v1
    fieldref:
      fieldpath: metadata.name

cm-init-pod.yaml：

apiVersion: v1
kind: Pod
metadata:
  name: cm-vol-pod 
  labels:
    app: nginx
spec:
  containers:
    - name: nginx 
      image: nginx

nginx.conf：

blalb-a
bla-bla
backend ##PHP_FPM##
bl-abla
bla-bla

服务端

apiVersion: v1
kind: Service
metadata:
  name: app-service
spec:
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx

补丁文件

apiVersion: v1
kind: Pod
metadata:
  name: cm-vol-pod 
spec:
  containers:
    - name: nginx 
      image: nginx
      command: [ "bash", "-c", "nginx -g \"daemon off;\""  ]
      volumeMounts:
      - name: ed
# this is not a real nginx.conf so I've put it next to the original one
        mountPath: /etc/nginx/nginx.conf1 
        subPath: nginx.conf
  initContainers:
    - name: init
      image: nginx
      command: [ "/bin/sh", "-c", "cp /mnt/cm/nginx.conf /mnt/ed/nginx.conf && sed -i 's/##PHP_FPM##/$(PHP_FPM)/' /mnt/ed/nginx.conf" ]
      volumeMounts:
      - name: cm
        mountPath: /mnt/cm
      - name: ed
        mountPath: /mnt/ed
  volumes:
    - name: cm
      configMap:
        name: mymap
    - name: ed
      emptyDir: {}

结果：

$ kustomize build | kubectl apply -f -
# or kubectl apply -k ./

configmap/mymap-k2hbfmf776 created
service/app-service created
pod/cm-vol-pod created

$ kubectl exec -it cm-vol-pod -- bash

root@cm-vol-pod:/# cat /etc/nginx/nginx.conf1

blalb-a
bla-bla
backend app-service
bl-abla
bla-bla

让我们清理一切

$ kustomize build | kubectl delete -f -

# or

$ kubectl delete -k ./

configmap "mymap-k2hbfmf776" deleted
service "app-service" deleted
pod "cm-vol-pod" deleted

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