Stack Overflow Asked by Emmanuel Mendoza on December 16, 2021
I’m taking a course that uses Kubernetes and am running into an error when I try to create a pod in Kubernetes.
I’m using Ubuntu, AMD64
I installed microk8s.kubectl following these instructions (https://ubuntu.com/kubernetes/install)
Here’s my Dockerfile which runs correctly when I use only Docker.
FROM node:alpine
WORKDIR /app
COPY package.json ./
RUN npm install
COPY ./ ./
CMD ["npm", "start"]
Here’s my posts.yaml file, verbatim to the course I’m taking
apiVersion: v1
kind: Pod
metadata:
name: posts
spec:
containers:
- name: posts
image: emendoza1986/blog_posts:0.0.1
output from kubectl get pods
NAME READY STATUS RESTARTS AGE
posts 0/1 CrashLoopBackOff 6 10m
output from kubectl logs posts
/bin/sh: [npm,start]: not found
output from kubectl describe pod posts
Name: posts
Namespace: default
Priority: 0
Node: desktope/192.168.0.18
Start Time: Thu, 23 Jul 2020 10:58:40 -0700
Labels: <none>
Annotations: Status: Running
IP: 10.1.87.20
IPs:
IP: 10.1.87.20
Containers:
posts:
Container ID: containerd://acb403c53759670370959cfa2cc0939f53126aee889e1f6dc2e831bc4dc22c3c
Image: emendoza1986/blog_posts:0.0.1
Image ID: docker.io/emendoza1986/blog_posts@sha256:f69b30cf0382d4c273643ac11c505378854b966063974cc57d187718cc0b0fd5
Port: <none>
Host Port: <none>
State: Waiting
Reason: CrashLoopBackOff
Last State: Terminated
Reason: Error
Exit Code: 127
Started: Thu, 23 Jul 2020 10:58:59 -0700
Finished: Thu, 23 Jul 2020 10:58:59 -0700
Ready: False
Restart Count: 2
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-2fm2c (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-2fm2c:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-2fm2c
Optional: false
QoS Class: BestEffort
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 48s default-scheduler Successfully assigned default/posts to desktope
Normal Pulled 29s (x3 over 47s) kubelet, desktope Container image "emendoza1986/blog_posts:0.0.1" already present on machine
Normal Created 29s (x3 over 47s) kubelet, desktope Created container posts
Normal Started 29s (x3 over 47s) kubelet, desktope Started container posts
Warning BackOff 12s (x4 over 45s) kubelet, desktope Back-off restarting failed container
output from microk8s.status
microk8s is running
addons:
dashboard: enabled
dns: enabled
metrics-server: enabled
cilium: disabled
fluentd: disabled
gpu: disabled
helm: disabled
helm3: disabled
host-access: disabled
ingress: disabled
istio: disabled
jaeger: disabled
knative: disabled
kubeflow: disabled
linkerd: disabled
metallb: disabled
prometheus: disabled
rbac: disabled
registry: disabled
storage: disabled
output from microk8s inspect
Inspecting Certificates
Inspecting services
Service snap.microk8s.daemon-cluster-agent is running
Service snap.microk8s.daemon-containerd is running
Service snap.microk8s.daemon-apiserver is running
Service snap.microk8s.daemon-apiserver-kicker is running
Service snap.microk8s.daemon-proxy is running
Service snap.microk8s.daemon-kubelet is running
Service snap.microk8s.daemon-scheduler is running
Service snap.microk8s.daemon-controller-manager is running
Service snap.microk8s.daemon-flanneld is running
Service snap.microk8s.daemon-etcd is running
Copy service arguments to the final report tarball
Inspecting AppArmor configuration
Gathering system information
Copy processes list to the final report tarball
Copy snap list to the final report tarball
Copy VM name (or none) to the final report tarball
Copy disk usage information to the final report tarball
Copy memory usage information to the final report tarball
Copy server uptime to the final report tarball
Copy current linux distribution to the final report tarball
Copy openSSL information to the final report tarball
Copy network configuration to the final report tarball
Inspecting kubernetes cluster
Inspect kubernetes cluster
Building the report tarball
Report tarball is at /var/snap/microk8s/1503/inspection-report-20200723_112646.tar.gz
I see the error coming from the log but I haven’t been able to find a solution. Thank you for your help!
Thank you for the helpful comments. Originally I had my Dockerfile as CMD ['npm', 'start']. I had fixed it locally to CMD ["npm", "start"] but I didn't push the new version to docker hub. Pushing the new version fixed the problem.
Answered by Emmanuel Mendoza on December 16, 2021
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