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Problem

How to fix Nginx ingress controller "certificate signed by unknown authority" error?

Error:

"Internal error occurred: failed calling webhook \"validate.nginx.ingress.kubernetes.io\": failed to call webhook: Post \"https://nginx-ingress-ingress-nginx-controller-admission.default.svc:443/networking/v1/ingresses?timeout=10s\": x509: certificate signed by unknown authority"

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How to measure response time using curl?

Command:

curl -kv -w '\n* Response time: %{time_total}s\n' <IP_OR_URL>

Example:

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How to find Kubernetes Role or ClusterRole linked to a specific ServiceAccount?

kubectl get rolebinding,clusterrolebinding --all-namespaces -o jsonpath='{range .items[?(@.subjects[0].name=="SERVICE_ACCOUNT_NAME")]}[{.roleRef.kind},{.roleRef.name}]{end}'

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How to show all docker build logs?

docker build -t YOUR-USER-NAME/YOUR-REPO:<YOUR-IMAGE-TAG> --no-cache --progress=plain .

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Format

https://www.google.com/s2/favicons?domain=example.com

Example

https://www.google.com/s2/favicons?domain=github.com

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How to view the content of *.yaml.gz file stored in Kubernetes secret?

$ kubectl -n <NAMESPACE> get secret <SECRET> -o json | jq -r '.data."prometheus.yaml.gz"' | base64 -d | gunzip

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• How to install x11vnc vnc server as a service on Ubuntu 20.04, for remote access or screen sharing
• Headless X11

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How do I see how much free ram I really have?

$ free | grep Mem | awk '{print $3/$2 * 100.0}'

Source: https://www.linuxatemyram.com

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# List all apps
heroku apps

# Delete all apps created by yourself
for app in $(heroku apps --json | jq -r '.[] | select(.owner.email == "<insert-heroku-email-here>") | .name'); do echo $app | heroku apps:destroy $app; done

# Leave all apps created by others where you were a collaborator
for app in $(heroku apps --json | jq -r '.[] | select(.owner.email != "<insert-heroku-email-here>") | .name'); do heroku apps:leave -a $app; done

# List all apps again

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apiVersion: v1
kind: Namespace
metadata:
  name: dummy-exporter
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: dummy-exporter