我正在尝试让我的多克化 Rails 应用程序在 GCP 托管的 Kubernetes 上运行。
kubectl apply -f k8s/webshop.yml
kubectl get pods
NAME READY STATUS RESTARTS AGE
shop-lcvxc 2/3 CrashLoopBackOff 23 1h
到目前为止一切顺利，但应用程序将无法启动。进一步调查显示，它曾两次尝试启动 Rails (Puma)。知道为什么会这样吗？
日志
$ kubectl 日志商店-lcvxc -c 网上商店
=> Booting Puma
=> Rails 5.2.0 application starting in development
=> Run `rails server -h` for more startup options
initialize PushNotifications
Puma starting in single mode...
* Version 3.11.4 (ruby 2.4.4-p296), codename: Love Song
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3001
Exiting
/usr/local/bundle/gems/puma-3.11.4/lib/puma/binder.rb:270:in `initialize':
Address already in use - bind(2) for "0.0.0.0" port 3001 (Errno::EADDRINUSE)
$ kubectl 日志商店-lcvxc -c 应用程序
=> Booting Puma
=> Rails 5.2.0 application starting in development
=> Run `rails server -h` for more startup options
initialize PushNotifications
Puma starting in single mode...
* Version 3.11.4 (ruby 2.4.4-p296), codename: Love Song
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3001
Use Ctrl-C to stop
k8s/webshop.yml
1 # from https://cloud.google.com/sql/docs/postgres/connect-kubernetes-engine
2 apiVersion: extensions/v1beta1
3 kind: Deployment
4 metadata:
5 name: webshop
6 labels:
7 app: webshop
8
9 spec:
10 template:
11 metadata:
12 labels:
13 app: webshop
14 spec:
15 containers:
16 - name: app
17 image: eu.gcr.io/company/webshop:latest
18 ports:
19 - containerPort: 3000
20 # The following environment variables will contain the database host,
21 # user and password to connect to the PostgreSQL instance.
22 env:
23 - name: POSTGRES_HOST
24 value: 127.0.0.1:5432
25 - name: POSTGRES_DB
26 value: webshop-staging
27 # [START cloudsql_secrets]
28 - name: POSTGRES_USER
29 valueFrom:
30 secretKeyRef:
31 name: cloudsql-db-credentials
32 key: username
33 - name: POSTGRES_PASSWORD
34 valueFrom:
35 secretKeyRef:
36 name: cloudsql-db-credentials
37 key: password
38 # [END cloudsql_secrets]
39
40 # [START proxy_container]
41 - name: cloudsql-proxy
42 image: gcr.io/cloudsql-docker/gce-proxy:1.11
43 command: ["/cloud_sql_proxy",
44 "-instances=company:europe-west1:staging=tcp:5432",
45 "-credential_file=/secrets/cloudsql/credentials.json"]
46 volumeMounts:
47 - name: cloudsql-instance-credentials
48 mountPath: /secrets/cloudsql
49 readOnly: true
50 # [END proxy_container]
51 # [START volumes]
52 volumes:
53 - name: cloudsql-instance-credentials
54 secret:
55 secretName: cloudsql-instance-credentials
56 # [END volumes]
57
Dockerfile
FROM XX.dkr.ecr.eu-west-1.amazonaws.com/webshop-bundled:1.3
COPY Gemfile* /app/
COPY . /app/
WORKDIR /app
CMD ["/usr/local/bundle/bin/rails", "s", "-b", "0.0.0.0", "-p", "3001"]
^ 该图像来自此图像：
Dockerfile 捆绑
FROM ruby:2.4-slim-jessie
RUN apt-get update
RUN apt-get install -y libpq-dev libgmp-dev libxml2-dev libxslt-dev
RUN apt-get install -y build-essential patch ruby-dev zlib1g-dev liblzma-dev
COPY Gemfile* /app/
WORKDIR /app
RUN bundle install
✗ kubectl 描述 pod shop-lcvxc
Name: webapp-5845b768f7-tflbv
Namespace: default
Node: gke-my-fam-default-pool-12d29bdf-c9t0/10.166.0.3
Start Time: Fri, 06 Jul 2018 08:18:16 +0200
Labels: pod-template-hash=1401632493
run=webapp
Annotations: kubernetes.io/limit-ranger=LimitRanger plugin set: cpu request for container webapp
Status: Running
IP: 10.4.0.6
Controlled By: ReplicaSet/webapp-5845b768f7
Containers:
webapp:
Container ID: docker://889fbc56fc28
Image: eu.gcr.io/acme-my-fam/webapp:latest
Image ID: docker-pullable://eu.gcr.io/acme-my-fam/webapp@sha256:nnnn
Port: 8080/TCP
State: Running
Started: Fri, 06 Jul 2018 08:18:43 +0200
Ready: True
Restart Count: 0
Requests:
cpu: 100m
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-bs796 (ro)
Conditions:
Type Status
Initialized True
Ready True
PodScheduled True
Volumes:
default-token-bs796:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-bs796
Optional: false
QoS Class: Burstable
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 10m default-scheduler Successfully assigned webapp-5845b768f7-tflbv to gke-my-fam-default-pool-12d29bdf-c9t0
Normal SuccessfulMountVolume 10m kubelet, gke-my-fam-default-pool-12d29bdf-c9t0 MountVolume.SetUp succeeded for volume "default-token-bs796"
Normal Pulling 10m kubelet, gke-my-fam-default-pool-12d29bdf-c9t0 pulling image "eu.gcr.io/acme-my-fam/webapp:latest"
Normal Pulled 10m kubelet, gke-my-fam-default-pool-12d29bdf-c9t0 Successfully pulled image "eu.gcr.io/acme-my-fam/webapp:latest"
Normal Created 10m kubelet, gke-my-fam-default-pool-12d29bdf-c9t0 Created container
Normal Started 10m kubelet, gke-my-fam-default-pool-12d29bdf-c9t0 Started container