'How do I access npm log files in GKE?

I'm running different nodejs microservices on Google Kubernetes Services. Sometimes these services crash and according to Cloud Logging, I can find detailed information in a logging file. For example, the logging message says

{
  "textPayload": "npm ERR!     /root/.npm/_logs/2021-10-27T11_26_28_534Z-debug.log\n",
  "insertId": "zoqxk8wvkuofhslm",
  "resource": {
    "type": "k8s_container",
    "labels": {
      "pod_name": "client-depl-7f679c6b49-5d9tz",
      "container_name": "client",
      "namespace_name": "production",
      "cluster_name": "cluster-1",
      "location": "europe-west3-a",
      "project_id": "XXX"
    }
  },
  "timestamp": "2021-10-27T11:26:28.701252670Z",
  "severity": "ERROR",
  "labels": {
    "k8s-pod/app": "client",
    "k8s-pod/skaffold_dev/run-id": "b5518659-05d6-4c08-9b55-9d58fdd5807f",
    "k8s-pod/pod-template-hash": "7f679c6b49",
    "compute.googleapis.com/resource_name": "gke-cluster-1-pool-1-8bfc60b2-ag86",
    "k8s-pod/app_kubernetes_io/managed-by": "skaffold"
  },
  "logName": "projects/xxx-productive/logs/stderr",
  "receiveTimestamp": "xxx"
}

Where do I find these logs on Google Cloud Platform?

---------------- Edit 2021.10.28 ---------------------------

I should clarify that I am already using the logs explorer. This is what I see there: Logs Explorer showing npm error

The logs show 7 consecutive error entries about npm failing. The last two entries indicate that there are more information in a log file "/root/.npm/_logs/2021-10-27T11_26_28_534Z-debug.log". Does this log file has more info about the failure or is all the info I get in these 7 error log entries?

Thanks

node.jsnpmgoogle-cloud-platformgoogle-kubernetes-engine


Solution 1:[1]

  1. kubectl logs <your_pod>
  2. You can use GCP Logs Explorer enter image description here

Solution 2:[2]

Assuming you already Enable Logging and Monitoring, You can view logs on:

a. Go to the Logs explorer in the Cloud Console.

b. Click Resource. Under ALL_RESOURCE_TYPES, select Kubernetes Container.

c. Under CLUSTER_NAME, select the name of your user cluster.

d. Under NAMESPACE_NAME, select default.

e. Click Add and then click Run Query.

f. Under Query results, you can see log entries from the monitoring-example Deployment. For example:

{ "textPayload": "2020/11/14 01:24:24 Starting to listen on :9090\n",
"insertId": "1oa4vhg3qfxidt",
"resource": {
"type": "k8s_container",
"labels": {
"pod_name": "monitoring-example-7685d96496-xqfsf",
"cluster_name": ...,
"namespace_name": "default",
"project_id": ...,
"location": "us-west1",
"container_name": "prometheus-example-exporter"
}
}, "timestamp": "2020-11-14T01:24:24.358600252Z",
"labels": {
"k8s-pod/pod-template-hash": "7685d96496",
"k8s-pod/app": "monitoring-example"
},
"logName": "projects/.../logs/stdout",
"receiveTimestamp": "2020-11-14T01:24:39.562864735Z"
}

Solution 3:[3]

How about

  • log into the pod while it is alive

    kubectl exec -it your-pod -- sh

  • wait for it to crash and watch the crash file in real time while the pod is not restarted yet :)

Solution 4:[4]

How to login to a GCP Pod:

  1. From the Google Cloud Platform main menu go to Kubernetes Engine -> Workloads

  2. Click on the workload you're interested in: workloads

  3. Find the Managed Pods section and click on the Pod you want to access: managed pods

  4. Click on KUBECTL -> Exec -> [name of workload/namespace] enter image description here

  5. A terminal should appear at the bottom of the browser page, SSHing you into the pod. You can look around for your log file from inside here

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Vitalii Yarmolenko
Solution 2 JaysonM
Solution 3 Vitalii Yarmolenko
Solution 4 Dharman

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