Im running a K3s on multiple RPis which works fine except for showing logs.
kubectl logs <pod-name> is always empty.
For testing, I'm running busybox:
apiVersion: v1
kind: Pod
metadata:
name: example
spec:
containers:
- name: example
image: busybox
args: [/bin/sh, -c, 'while true; do echo $(date); sleep 1; done']
The pod is running, but still no logs.
I'm suspecting log2ram, which I installed to not destroy my SD-Cards in the long run.
However, I can't figure out, why this happens and how to fix this.
Just found out, that log2ram was full.
Clearing the /var/logs folder on the hosting node resolved the problem
I am creating a pod from an image which resides on the master node. When I create a pod on the master node to be scheduled on the worker node, I get the status of pod ErrImageNeverPull
kind: Pod
metadata:
name: cloud-pipe
labels:
app: cloud-pipe
spec:
containers:
- name: cloud-pipe
image: cloud-pipeline:latest
command: ["sleep"]
args: ["infinity"]
Kubectl describe pod details:
Type Reason Age From Message
- --- ------ ---- ---- -------
Normal Scheduled 15m default-scheduler Successfully assigned
default/cloud-pipe to knode
Warning ErrImageNeverPull 5m54s (x49 over 16m) kubelet Container image "cloud-
pipeline:latest" is not present with pull policy of Never
Warning Failed 51s (x72 over 16m) kubelet Error: ErrImageNeverPull
How to resolve this issue. Also, my question is does Kubernetes by default looks on the worker node for the image to exist?. Thanks
When kubernetes creates containers, it first looks to local images, and then will try registry(docker registry by default)
You are getting this error because:
your image cant be found localy on your node.
you specified imagePullPolicy: Never, so you will never try to download image from registry
You have few ways of resolving this, but all of them generally instruct you to get image locally and tag it properly.
To get image on your node you can:
copy images from one node to another
build image from existing Dockerfile
Once you get image, tag it and specify in the deployment
docker tag cloud-pipeline:latest mytest:mytest
kind: Pod
metadata:
name: cloud-pipe
labels:
app: cloud-pipe
spec:
containers:
- name: cloud-pipe
image: mytest:mytest
imagePullPolicy: Never
command: ["sleep"]
args: ["infinity"]
Or you can configure own local registry, push tagged image into it, and use imagePullPolicy: IfNotPresent. More information in #dryairship answer
Also please be sure using eval $(minikube docker-env) for imagePullPolicy: Never images, in case you are using minikube (you havent specified any tag, but it can be helpful). More information in Getting “ErrImageNeverPull” in pods question
When I try to create Deployment as Type Job, it's not pulling any image.
Below is .yaml:
apiVersion: batch/v1
kind: Job
metadata:
name: copyartifacts
spec:
backoffLimit: 1
template:
metadata:
name: copyartifacts
spec:
restartPolicy: "Never"
volumes:
- name: sharedvolume
persistentVolumeClaim:
claimName: shared-pvc
- name: dockersocket
hostPath:
path: /var/run/docker.sock
containers:
- name: copyartifacts
image: alpine:3.7
imagePullPolicy: Always
command: ["sh", "-c", "ls -l /shared; rm -rf /shared/*; ls -l /shared; while [ ! -d /shared/artifacts ]; do echo Waiting for artifacts to be copied; sleep 2; done; sleep 10; ls -l /shared/artifacts; "]
volumeMounts:
- mountPath: /shared
name: sharedvolume
Can you please guide here?
Regards,
Vikas
There could be two possible reasons for not seeing pod.
The pod hasn't been created yet.
The pod has completed it's task and terminated before you have noticed.
1. Pod hasn't been created:
If pod hasn't been created yet, you have to find out why the job failed to create pod. You can view job's events to see if there are any failure event. Use following command to describe a job.
kubectl describe job <job-name> -n <namespace>
Then, check the Events: field. There might be some events showing pod creation failure with respective reason.
2. Pod has completed and terminated:
Job's are used to perform one-time task rather than serving an application that require to maintain a desired state. When the task is complete, pod goes to completed state then terminate (but not deleted). If your Job is intended for a task that does not take much time, the pod may terminate after completing the task before you have noticed.
As the pod is terminated, kubectl get pods will not show that pod. However, you will able to see the pod using kubectl get pods -a command as it hasn't been deleted.
You can also describe the job and check for completion or success event.
if you use kind created the K8s cluster, all the cluster node run as docker. If you had reboot you computer or VM, the cluster (pod) ip address may change, leeding to the cluster node internet communication failed. In this case, see the cluster manager logs, it has error message. Job created, but pod not.
try to re-create the cluster, or change the node config about ip address.
This is what I keep getting:
[root#centos-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nfs-server-h6nw8 1/1 Running 0 1h
nfs-web-07rxz 0/1 CrashLoopBackOff 8 16m
nfs-web-fdr9h 0/1 CrashLoopBackOff 8 16m
Below is output from describe pods
kubectl describe pods
Events:
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
16m 16m 1 {default-scheduler } Normal Scheduled Successfully assigned nfs-web-fdr9h to centos-minion-2
16m 16m 1 {kubelet centos-minion-2} spec.containers{web} Normal Created Created container with docker id 495fcbb06836
16m 16m 1 {kubelet centos-minion-2} spec.containers{web} Normal Started Started container with docker id 495fcbb06836
16m 16m 1 {kubelet centos-minion-2} spec.containers{web} Normal Started Started container with docker id d56f34ae4e8f
16m 16m 1 {kubelet centos-minion-2} spec.containers{web} Normal Created Created container with docker id d56f34ae4e8f
16m 16m 2 {kubelet centos-minion-2} Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "web" with CrashLoopBackOff: "Back-off 10s restarting failed container=web pod=nfs-web-fdr9h_default(461c937d-d870-11e6-98de-005056040cc2)"
I have two pods: nfs-web-07rxz, nfs-web-fdr9h, but if I do kubectl logs nfs-web-07rxz or with -p option I don't see any log in both pods.
[root#centos-master ~]# kubectl logs nfs-web-07rxz -p
[root#centos-master ~]# kubectl logs nfs-web-07rxz
This is my replicationController yaml file:
replicationController yaml file
apiVersion: v1 kind: ReplicationController metadata: name: nfs-web spec: replicas: 2 selector:
role: web-frontend template:
metadata:
labels:
role: web-frontend
spec:
containers:
- name: web
image: eso-cmbu-docker.artifactory.eng.vmware.com/demo-container:demo-version3.0
ports:
- name: web
containerPort: 80
securityContext:
privileged: true
My Docker image was made from this simple docker file:
FROM ubuntu
RUN apt-get update
RUN apt-get install -y nginx
RUN apt-get install -y nfs-common
I am running my kubernetes cluster on CentOs-1611, kube version:
[root#centos-master ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"3", GitVersion:"v1.3.0", GitCommit:"86dc49aa137175378ac7fba7751c3d3e7f18e5fc", GitTreeState:"clean", BuildDate:"2016-12-15T16:57:18Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"3", GitVersion:"v1.3.0", GitCommit:"86dc49aa137175378ac7fba7751c3d3e7f18e5fc", GitTreeState:"clean", BuildDate:"2016-12-15T16:57:18Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}
If I run the docker image by docker run I was able to run the image without any issue, only through kubernetes I got the crash.
Can someone help me out, how can I debug without seeing any log?
As #Sukumar commented, you need to have your Dockerfile have a Command to run or have your ReplicationController specify a command.
The pod is crashing because it starts up then immediately exits, thus Kubernetes restarts and the cycle continues.
#Show details of specific pod
kubectl describe pod <pod name> -n <namespace-name>
# View logs for specific pod
kubectl logs <pod name> -n <namespace-name>
If you have an application that takes slower to bootstrap, it could be related to the initial values of the readiness/liveness probes. I solved my problem by increasing the value of initialDelaySeconds to 120s as my SpringBoot application deals with a lot of initialization. The documentation does not mention the default 0 (https://kubernetes.io/docs/api-reference/v1.9/#probe-v1-core)
service:
livenessProbe:
httpGet:
path: /health/local
scheme: HTTP
port: 8888
initialDelaySeconds: 120
periodSeconds: 5
timeoutSeconds: 5
failureThreshold: 10
readinessProbe:
httpGet:
path: /admin/health
scheme: HTTP
port: 8642
initialDelaySeconds: 150
periodSeconds: 5
timeoutSeconds: 5
failureThreshold: 10
A very good explanation about those values is given by What is the default value of initialDelaySeconds.
The health or readiness check algorithm works like:
wait for initialDelaySeconds
perform check and wait timeoutSeconds for a timeout
if the number of continued successes is greater than successThreshold return success
if the number of continued failures is greater than failureThreshold return failure otherwise wait periodSeconds and start a new check
In my case, my application can now bootstrap in a very clear way, so that I know I will not get periodic crashloopbackoff because sometimes it would be on the limit of those rates.
I had the need to keep a pod running for subsequent kubectl exec calls and as the comments above pointed out my pod was getting killed by my k8s cluster because it had completed running all its tasks. I managed to keep my pod running by simply kicking the pod with a command that would not stop automatically as in:
kubectl run YOUR_POD_NAME -n YOUR_NAMESPACE --image SOME_PUBLIC_IMAGE:latest --command tailf /dev/null
My pod kept crashing and I was unable to find the cause. Luckily there is a space where kubernetes saves all the events that occurred before my pod crashed.
(#List Events sorted by timestamp)
To see these events run the command:
kubectl get events --sort-by=.metadata.creationTimestamp
make sure to add a --namespace mynamespace argument to the command if needed
The events shown in the output of the command showed my why my pod kept crashing.
From This page, the container dies after running everything correctly but crashes because all the commands ended. Either you make your services run on the foreground, or you create a keep alive script. By doing so, Kubernetes will show that your application is running. We have to note that in the Docker environment, this problem is not encountered. It is only Kubernetes that wants a running app.
Update (an example):
Here's how to avoid CrashLoopBackOff, when launching a Netshoot container:
kubectl run netshoot --image nicolaka/netshoot -- sleep infinity
In your yaml file, add command and args lines:
...
containers:
- name: api
image: localhost:5000/image-name
command: [ "sleep" ]
args: [ "infinity" ]
...
Works for me.
I observed the same issue, and added the command and args block in yaml file. I am copying sample of my yaml file for reference
apiVersion: v1
kind: Pod
metadata:
labels:
run: ubuntu
name: ubuntu
namespace: default
spec:
containers:
- image: gcr.io/ow/hellokubernetes/ubuntu
imagePullPolicy: Never
name: ubuntu
resources:
requests:
cpu: 100m
command: ["/bin/sh"]
args: ["-c", "while true; do echo hello; sleep 10;done"]
dnsPolicy: ClusterFirst
enableServiceLinks: true
As mentioned in above posts, the container exits upon creation.
If you want to test this without using a yaml file, you can pass the sleep command to the kubectl create deployment statement. The double hyphen -- indicates a command, which is equivalent of command: in a Pod or Deployment yaml file.
The below command creates a deployment for debian with sleep 1234, so it doesn't exit immediately.
kubectl create deployment deb --image=debian:buster-slim -- "sh" "-c" "while true; do sleep 1234; done"
You then can create a service etc, or, to test the container, you can kubectl exec -it <pod-name> -- sh (or -- bash) into the container you just created to test it.
I solved this problem I increased memory resource
resources:
limits:
cpu: 1
memory: 1Gi
requests:
cpu: 100m
memory: 250Mi
In my case the problem was what Steve S. mentioned:
The pod is crashing because it starts up then immediately exits, thus Kubernetes restarts and the cycle continues.
Namely I had a Java application whose main threw an exception (and something overrode the default uncaught exception handler so that nothing was logged). The solution was to put the body of main into try { ... } catch and print out the exception. Thus I could find out what was wrong and fix it.
(Another cause could be something in the app calling System.exit; you could use a custom SecurityManager with an overridden checkExit to prevent (or log the caller of) exit; see https://stackoverflow.com/a/5401319/204205.)
Whilst troubleshooting the same issue I found no logs when using kubeclt logs <pod_id>.
Therefore I ssh:ed in to the node instance to try to run the container using plain docker. To my surprise this failed also.
When entering the container with:
docker exec -it faulty:latest /bin/sh
and poking around I found that it wasn't the latest version.
A faulty version of the docker image was already available on the instance.
When I removed the faulty:latest instance with:
docker rmi faulty:latest
everything started to work.
I had same issue and now I finally resolved it. I am not using docker-compose file.
I just added this line in my Docker file and it worked.
ENV CI=true
Reference:
https://github.com/GoogleContainerTools/skaffold/issues/3882
Try rerunning the pod and running
kubectl get pods --watch
to watch the status of the pod as it progresses.
In my case, I would only see the end result, 'CrashLoopBackOff,' but the docker container ran fine locally. So I watched the pods using the above command, and I saw the container briefly progress into an OOMKilled state, which meant to me that it required more memory.
In my case this error was specific to the hello-world docker image. I used the nginx image instead of the hello-world image and the error was resolved.
i solved this problem by removing space between quotes and command value inside of array ,this is happened because container exited after started and no executable command present which to be run inside of container.
['sh', '-c', 'echo Hello Kubernetes! && sleep 3600']
I had similar issue but got solved when I corrected my zookeeper.yaml file which had the service name mismatch with file deployment's container names. It got resolved by making them same.
apiVersion: v1
kind: Service
metadata:
name: zk1
namespace: nbd-mlbpoc-lab
labels:
app: zk-1
spec:
ports:
- name: client
port: 2181
protocol: TCP
- name: follower
port: 2888
protocol: TCP
- name: leader
port: 3888
protocol: TCP
selector:
app: zk-1
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: zk-deployment
namespace: nbd-mlbpoc-lab
spec:
template:
metadata:
labels:
app: zk-1
spec:
containers:
- name: zk1
image: digitalwonderland/zookeeper
ports:
- containerPort: 2181
env:
- name: ZOOKEEPER_ID
value: "1"
- name: ZOOKEEPER_SERVER_1
value: zk1
In my case, the issue was a misconstrued list of command-line arguments. I was doing this in my deployment file:
...
args:
- "--foo 10"
- "--bar 100"
Instead of the correct approach:
...
args:
- "--foo"
- "10"
- "--bar"
- "100"
I finally found the solution when I execute 'docker run xxx ' command ,and I got the error then.It is caused by incomplete-platform .
It seems there could be a lot of reasons why a Pod should be in crashloopbackoff state.
In my case, one of the container was terminating continuously due to the missing Environment value.
So, the best way to debug is to -
1. check Pod description output i.e. kubectl describe pod abcxxx
2. check the events generated related to the Pod i.e. kubectl get events| grep abcxxx
3. Check if End-points have been created for the Pod i.e. kubectl get ep
4. Check if dependent resources have been in-place e.g. CRDs or configmaps or any other resource that may be required.
kubectl logs -f POD, will only produce logs from a running container. Suffix --previous to the command to get logs from a previous container. Used maily for debugging. Hope this helps.
I'm setting up a Kubernetes cluster and am testing a small container. This is my YAML file for the pod:
apiVersion: v1
kind: Pod
metadata:
name: example
spec:
restartPolicy: Never
containers:
- name: node
image: 'node:5'
command: ['node']
args: ['-e', 'console.log(1234)']
I deploy it with kubectl create -f example.yml and sure enough it runs as expected:
$ kubectl logs example
1234
However, the pod's status is "Error":
$ kubectl get po example
NAME READY STATUS RESTARTS AGE
example 0/1 Error 0 16m
How can I investigate why the status is "Error"?
kubectl describe pod example will give you more info on what's going on
also
kubectl get events can get you more details too although not dedicated to the given pod.