Tag Archives: k8s

Google Autopilot and Gitlab failed builds

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Problem

You want to use Google’s Autopilot for your gitlab runners, but your job/builds fail because of low resources (ie ephemeral storage).

Solution

You can use a limit range to increase the limits for ephemeral storage or/and memory that will make Google’s autopilot to use them and scale them appropriately.

Create a limit range file like:

apiVersion: v1
kind: LimitRange
metadata:
  name: limit-ephemeral-storage
spec:
  limits:
  - default:
      ephemeral-storage: "10Gi"
      memory: "16Gi"
    defaultRequest:
      ephemeral-storage: "10Gi"
      memory: "16Gi"
    type: Container

And then apply it to your cluster

kubectl -n namespace apply -f limit_range.yaml

sudo kubeadmin init returns with: [ERROR Swap]: running with swap on is not supported. Please disable swap

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Problem

You are trying to set up kubernetes on your local machine but trying to use initialize it with kubeadmin init, returns the following error:

[init] Using Kubernetes version: v1.18.3
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
        [ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher

Solution

Switch the swap to off (Ubuntu command below) and try again.

sudo swapoff -a

WARN[0000] Your Skaffold version might be too old. Download the latest version (1.0.1) at https://storage.googleapis.com/skaffold/releases/latest/skaffold-linux-amd64

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Problem

You would like to follow the example for working with skaffold by using the skaffold dev command but you are getting the following error:

kosmas:getting-started (master)$ skaffold dev
WARN[0000] Your Skaffold version might be too old. Download the latest version (1.0.1) at https://storage.googleapis.com/skaffold/releases/latest/skaffold-linux-amd64

Solution

Download the latest release from here https://github.com/GoogleContainerTools/skaffold/releases and follow the instructions for installing it in your system (ie linux):

 curl -Lo skaffold https://storage.googleapis.com/skaffold/releases/v1.0.1/skaffold-linux-amd64 && chmod +x skaffold && sudo mv skaffold /usr/local/bin

kubectl error: “The connection to the server localhost:8080 was refused – did you specify the right host or port?”

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Problem

You want to use the kubectl to get your cluster information but you are getting the following error message

$ kubectl cluster-info
 To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
 The connection to the server localhost:8080 was refused - did you specify the right host or port?

Solution

That could happen if you have already setup kubectl before or have used a different environment.

So you will need to first unset the environment variable KUBECONFIG with:

$ unset KUBECONFIG

and then use the gcloud client to set your environment again:


$ gcloud container clusters get-credentials your_cluster_name --zone europe-west2-a --project your_project_name

So after this you should be able to use kubectl to get the cluster information

kubeconfig entry generated for your_cluster_name.

$ kubectl cluster-info
Kubernetes master is running at https://xxx.xxx.xxx.xxx
GLBCDefaultBackend is running at https://xxx.xxx.xxx.xxx/api/v1/namespaces/kube-system/services/default-http-backend:http/proxy
Heapster is running at https://xxx.xxx.xxx.xxx/api/v1/namespaces/kube-system/services/heapster/proxy
KubeDNS is running at https://xxx.xxx.xxx.xxx/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
Metrics-server is running at https://xxx.xxx.xxx.xxx/api/v1/namespaces/kube-system/services/https:metrics-server:/proxy