K8S 解释器上的 Apache Zeppelin 由于 UnknownHostException 崩溃

问题描述 投票：0回答：2

嗨，需要帮助！

我已经在我的 k8s 集群上的 zeppelin 命名空间下部署了 apache/zeppelin:0.9.0，遵循 documentation，这是我的 zeppeling-server.yaml 文件：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: zeppelin-notebook
  namespace: zeppelin
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
status: {}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: zeppelin-server-conf-map
data:
  # 'serviceDomain' is a Domain name to use for accessing Zeppelin UI.
  # Should point IP address of 'zeppelin-server' service.
  #
  # Wildcard subdomain need to be point the same IP address to access service inside of Pod (such as SparkUI).
  # i.e. if service domain is 'local.zeppelin-project.org', DNS configuration should make 'local.zeppelin-project.org' and '*.local.zeppelin-project.org' point the same address.
  #
  # Default value is 'local.zeppelin-project.org' while it points 127.0.0.1 and `kubectl port-forward zeppelin-server` will give localhost to connects.
  # If you have your ingress controller configured to connect to `zeppelin-server` service and have a domain name for it (with wildcard subdomain point the same address), you can replace serviceDomain field with your own domain.
  #SERVICE_DOMAIN: local.zeppelin-project.org:8080
  SERVICE_DOMAIN: https://zeppelin.karstecsa.com.ar/
  ZEPPELIN_K8S_SPARK_CONTAINER_IMAGE: spark:2.4.5
  ZEPPELIN_K8S_CONTAINER_IMAGE: apache/zeppelin:0.9.0-SNAPSHOT
  ZEPPELIN_HOME: /zeppelin
  ZEPPELIN_SERVER_RPC_PORTRANGE: 12320:12322
  # default value of 'master' property for spark interpreter.
  SPARK_MASTER: k8s://https://kubernetes.zeppelin.svc
  # default value of 'SPARK_HOME' property for spark interpreter.
  SPARK_HOME: /spark
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: zeppelin-server-conf
data:
  nginx.conf: |
    daemon off;
    worker_processes auto;
    events {
      worker_connections 1024;
    }
    http {
      map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
      }

      # first server block will be default. Proxy zeppelin server.
      server {
        listen 80;
        location / {
          proxy_pass http://localhost:8080;
          proxy_set_header Host $host;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection $connection_upgrade;
          proxy_redirect http://localhost $scheme://SERVICE_DOMAIN;
        }
      }

      # match request domain [port]-[service].[serviceDomain]
      # proxy extra service such as spark-ui
      server {
        listen 80;
        server_name "~(?<svc_port>[0-9]+)-(?<svc_name>[^.]*)\.(.*)";
        location / {
          resolver 127.0.0.1:53 ipv6=off;
          proxy_pass http://$svc_name.NAMESPACE.svc:$svc_port;
          proxy_set_header Host $host;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection $connection_upgrade;
          proxy_redirect http://localhost $scheme://SERVICE_DOMAIN;

          # redirect rule for spark ui. 302 redirect response misses port number of service domain
          proxy_redirect ~(http:[/]+[0-9]+[-][^-]+[-][^.]+)[^/]+(\/jobs.*) $1.SERVICE_DOMAIN$2;
        }
      }
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: zeppelin-server
  labels:
    app.kubernetes.io/name: zeppelin-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: zeppelin-server
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app.kubernetes.io/name: zeppelin-server
    spec:
      serviceAccountName: zeppelin-server
      volumes:
      - name: nginx-conf
        configMap:
          name: zeppelin-server-conf
          items:
          - key: nginx.conf
            path: nginx.conf
      - name: zeppelin-server-notebook-volume
        persistentVolumeClaim:
          claimName: zeppelin-notebook
#      - name: zeppelin-server-conf
#        persistentVolumeClaim:
#          claimName: zeppelin-conf
#      - name: zeppelin-server-custom-k8s
#        persistentVolumeClaim:
#          claimName: zeppelin-k8s
      nodeSelector:
        kubernetes.io/hostname: worker01convergente
      containers:
      - name: zeppelin-server
        image: apache/zeppelin:0.9.0-SNAPSHOT
        command: ["sh", "-c", "$(ZEPPELIN_HOME)/bin/zeppelin.sh"]
        lifecycle:
          preStop:
            exec:
              # SIGTERM triggers a quick exit; gracefully terminate instead
              command: ["sh", "-c", "ps -ef | grep org.apache.zeppelin.server.ZeppelinServer | grep -v grep | awk '{print $2}' | xargs kill"]
        ports:
        - name: http
          containerPort: 8080
        - name: https
          containerPort: 8443
        - name: rpc
          containerPort: 12320
        env:
        - name: POD_UID
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.uid
        - name: POD_NAME
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.name
        envFrom:
        - configMapRef:
            name: zeppelin-server-conf-map
        volumeMounts:
        - name: zeppelin-server-notebook-volume     # configure this to persist notebook
          mountPath: /zeppelin/notebook
#        - name: zeppelin-server-conf                # configure this to persist Zeppelin configuration
#          mountPath: /zeppelin/conf
#        - name: zeppelin-server-custom-k8s          # configure this to mount customized Kubernetes spec for interpreter
#          mountPath: /zeppelin/k8s
      - name: zeppelin-server-gateway
        image: nginx:1.14.0
        command: ["/bin/sh", "-c"]
        env:
        - name: SERVICE_DOMAIN
          valueFrom:
            configMapKeyRef:
              name: zeppelin-server-conf-map
              key: SERVICE_DOMAIN
        args:
          - cp -f /tmp/conf/nginx.conf /etc/nginx/nginx.conf;
            sed -i -e "s/SERVICE_DOMAIN/$SERVICE_DOMAIN/g" /etc/nginx/nginx.conf;
            sed -i -e "s/NAMESPACE/$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace)/g" /etc/nginx/nginx.conf;
            cat /etc/nginx/nginx.conf;
            /usr/sbin/nginx
        volumeMounts:
          - name: nginx-conf
            mountPath: /tmp/conf
        lifecycle:
          preStop:
            exec:
              # SIGTERM triggers a quick exit; gracefully terminate instead
              command: ["/usr/sbin/nginx", "-s", "quit"]
      - name: dnsmasq  # nginx requires dns resolver for dynamic dns resolution
        image: "janeczku/go-dnsmasq:release-1.0.5"
        args:
          - --listen
          - "127.0.0.1:53"
          - --default-resolver
          - --append-search-domains
          - --hostsfile=/etc/hosts
          - --verbose
---
kind: Service
apiVersion: v1
metadata:
  name: zeppelin-server
spec:
  ports:
    - name: http
      port: 80
    - name: rpc            # port name is referenced in the code. So it shouldn't be changed.
      port: 12320
  selector:
    app.kubernetes.io/name: zeppelin-server
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: zeppelin-server
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: zeppelin-server-role
rules:
- apiGroups: [""]
  resources: ["pods", "services"]
  verbs: ["create", "get", "update", "patch", "list", "delete", "watch"]
- apiGroups: ["rbac.authorization.k8s.io"]
  resources: ["roles", "rolebindings"]
  verbs: ["bind", "create", "get", "update", "patch", "list", "delete", "watch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: zeppelin-server-role-binding
subjects:
- kind: ServiceAccount
  name: zeppelin-server
roleRef:
  kind: Role
  name: zeppelin-server-role
  apiGroup: rbac.authorization.k8s.io

我尝试过的事情

  • 起初，尝试使用 python 解释器运行“helloworld”是不可能的，因为 zeppelin:0.9.0 docker 镜像上没有安装 kubectl，所以我构建了 0.9.0-SNAPSHOT 镜像，添加了 kubectl 安装。
  • 现在 python 解释器 pod 和服务出现在我的仪表板上，但容器崩溃并出现以下错误：
 INFO [2020-08-29 22:04:39,544] ({main} RemoteInterpreterServer.java[<init>]:161) - Starting remote interpreter server on port 0, intpEventServerAddress: zeppelin-server-6d7f46d8d8-m9jlv.zeppelin.svc:12320
Exception in thread "main" org.apache.zeppelin.shaded.org.apache.thrift.transport.TTransportException: 
java.net.UnknownHostException: zeppelin-server-6d7f46d8d8-m9jlv.zeppelin.svc
    at org.apache.zeppelin.shaded.org.apache.thrift.transport.TSocket.open(TSocket.java:226)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer.<init>(RemoteInterpreterServer.java:167)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer.<init>(RemoteInterpreterServer.java:152)
    at org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer.main(RemoteInterpreterServer.java:321)
Caused by: java.net.UnknownHostException: zeppelin-server-6d7f46d8d8-m9jlv.zeppelin.svc
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:607)
    at org.apache.zeppelin.shaded.org.apache.thrift.transport.TSocket.open(TSocket.java:221)
    ... 3 more
  • 好的！所以我的 zeppelin-server pod 的名称是出现在 python 解释器日志中的名称，zeppelin-server-6d7f46d8d8-m9jlv，as shown here!。

我不知道还能做什么才能让它发挥作用！ 任何帮助、提示或建议将不胜感激！另外，如果需要更多信息，请告诉我，我当然会提供。

kubernetes apache-zeppelin
2个回答
1
投票

我能够通过将 Deployment 更改为 Pod 来运行此堆栈。这是我正在使用的完整 yaml：

请注意，我在 Pod 规格中使用自定义 

zeppelin:0.9.0
图像而不是 
apache/zeppelin:0.9.0
，因为它缺少 
kubectl
二进制

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
apiVersion: v1
kind: ConfigMap
metadata:
  name: zeppelin-server-conf-map
data:
  # 'serviceDomain' is a Domain name to use for accessing Zeppelin UI.
  # Should point IP address of 'zeppelin-server' service.
  #
  # Wildcard subdomain need to be point the same IP address to access service inside of Pod (such as SparkUI).
  # i.e. if service domain is 'local.zeppelin-project.org', DNS configuration should make 'local.zeppelin-project.org' and '*.local.zeppelin-project.org' point the same address.
  #
  # Default value is 'local.zeppelin-project.org' while it points 127.0.0.1 and `kubectl port-forward zeppelin-server` will give localhost to connects.
  # If you have your ingress controller configured to connect to `zeppelin-server` service and have a domain name for it (with wildcard subdomain point the same address), you can replace serviceDomain field with your own domain.
  SERVICE_DOMAIN: local.zeppelin-project.org:8080
  ZEPPELIN_K8S_SPARK_CONTAINER_IMAGE: spark:2.4.7-bin-hadoop-3.2.0-cloud-scala-2.11
  ZEPPELIN_K8S_CONTAINER_IMAGE: apache/zeppelin:0.9.0
  ZEPPELIN_HOME: /zeppelin
  ZEPPELIN_SERVER_RPC_PORTRANGE: 12320:12320
  # default value of 'master' property for spark interpreter.
  SPARK_MASTER: k8s://https://kubernetes.default.svc
  # default value of 'SPARK_HOME' property for spark interpreter.
  SPARK_HOME: /spark
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: zeppelin-server-conf
data:
  sparkContainerImage: spark:2.4.7-bin-hadoop-3.2.0-cloud-scala-2.11
  nginx.conf: |
    daemon off;
    worker_processes auto;
    events {
      worker_connections 1024;
    }
    http {
      map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
      }
      # first server block will be default. Proxy zeppelin server.
      server {
        listen 80;
        location / {
          proxy_pass http://localhost:8080;
          proxy_set_header Host $host;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection $connection_upgrade;
          proxy_redirect http://localhost $scheme://SERVICE_DOMAIN;
        }
      }
      # match request domain [port]-[service].[serviceDomain]
      # proxy extra service such as spark-ui
      server {
        listen 80;
        server_name "~(?<svc_port>[0-9]+)-(?<svc_name>[^.]*)\.(.*)";
        location / {
          resolver 127.0.0.1:53 ipv6=off;
          proxy_pass http://$svc_name.NAMESPACE.svc:$svc_port;
          proxy_set_header Host $host;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection $connection_upgrade;
          proxy_redirect http://localhost $scheme://SERVICE_DOMAIN;
          # redirect rule for spark ui. 302 redirect response misses port number of service domain
          proxy_redirect ~(http:[/]+[0-9]+[-][^-]+[-][^.]+)[^/]+(\/jobs.*) $1.SERVICE_DOMAIN$2;
        }
      }
    }
---
apiVersion: v1
kind: Pod
metadata:
  name: zeppelin-server
  labels:
    app.kubernetes.io/name: zeppelin-server
spec:
  serviceAccountName: zeppelin-server
  volumes:
  - name: nginx-conf
    configMap:
      name: zeppelin-server-conf
      items:
      - key: nginx.conf
        path: nginx.conf
  containers:
  - name: zeppelin-server
    image: zeppelin:0.9.0
    command: ["sh", "-c", "$(ZEPPELIN_HOME)/bin/zeppelin.sh"]
    lifecycle:
      preStop:
        exec:
          # SIGTERM triggers a quick exit; gracefully terminate instead
          command: ["sh", "-c", "ps -ef | grep org.apache.zeppelin.server.ZeppelinServer | grep -v grep | awk '{print $2}' | xargs kill"]
    ports:
    - name: http
      containerPort: 8080
    - name: https
      containerPort: 8443
    - name: rpc
      containerPort: 12320
    env:
    - name: POD_UID
      valueFrom:
        fieldRef:
          apiVersion: v1
          fieldPath: metadata.uid
    - name: POD_NAME
      valueFrom:
        fieldRef:
          apiVersion: v1
          fieldPath: metadata.name
    envFrom:
    - configMapRef:
        name: zeppelin-server-conf-map
  # volumeMounts:
  #  - name: zeppelin-server-notebook-volume     # configure this to persist notebook
  #    mountPath: /zeppelin/notebook
  #  - name: zeppelin-server-conf                # configure this to persist Zeppelin configuration
  #    mountPath: /zeppelin/conf
  #  - name: zeppelin-server-custom-k8s          # configure this to mount customized Kubernetes spec for interpreter
  #    mountPath: /zeppelin/k8s
  - name: zeppelin-server-gateway
    image: nginx:1.14.0
    command: ["/bin/sh", "-c"]
    env:
    - name: SERVICE_DOMAIN
      valueFrom:
        configMapKeyRef:
          name: zeppelin-server-conf-map
          key: SERVICE_DOMAIN
    args:
      - cp -f /tmp/conf/nginx.conf /etc/nginx/nginx.conf;
        sed -i -e "s/SERVICE_DOMAIN/$SERVICE_DOMAIN/g" /etc/nginx/nginx.conf;
        sed -i -e "s/NAMESPACE/$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace)/g" /etc/nginx/nginx.conf;
        cat /etc/nginx/nginx.conf;
        /usr/sbin/nginx
    volumeMounts:
      - name: nginx-conf
        mountPath: /tmp/conf
    lifecycle:
      preStop:
        exec:
          # SIGTERM triggers a quick exit; gracefully terminate instead
          command: ["/usr/sbin/nginx", "-s", "quit"]
  - name: dnsmasq  # nginx requires dns resolver for dynamic dns resolution
    image: "janeczku/go-dnsmasq:release-1.0.5"
    args:
      - --listen
      - "127.0.0.1:53"
      - --default-resolver
      - --append-search-domains
      - --hostsfile=/etc/hosts
      - --verbose
---
kind: Service
apiVersion: v1
metadata:
  name: zeppelin-server
spec:
  ports:
    - name: http
      port: 80
    - name: rpc            # port name is referenced in the code. So it shouldn't be changed.
      port: 12320
  selector:
    app.kubernetes.io/name: zeppelin-server
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: zeppelin-server
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: zeppelin-server-role
rules:
- apiGroups: [""]
  resources: ["pods", "services"]
  verbs: ["create", "get", "update", "patch", "list", "delete", "watch"]
- apiGroups: ["rbac.authorization.k8s.io"]
  resources: ["roles", "rolebindings"]
  verbs: ["bind", "create", "get", "update", "patch", "list", "delete", "watch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: zeppelin-server-role-binding
subjects:
- kind: ServiceAccount
  name: zeppelin-server
roleRef:
  kind: Role
  name: zeppelin-server-role
  apiGroup: rbac.authorization.k8s.io

此外，我们可以尝试覆盖 zeppelin 容器内的 

HOSTNAME
env var，但这可能会导致问题。不过没试过。

0
投票

我相信您遇到了竞争情况，Zeppelin 尝试在 K8S 注册其 DNS 名称之前连接 pod。如果您愿意构建自己的 Zeppelin，您可以尝试这个补丁：https://github.com/joomcode/zeppelin/commit/c8246ce34fe97014ed3c220109b4d249c360b42c，它为我们解决了这个问题。

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