Command to know.md

Command to know

Just some random commands that may help a lot..

Linux basic stuff

Create aliases to be faster

alias ll='ls -l’

Curl:

• curl -k (allow insecure)
• curl -v (verbose)

grep OR / AND:

grep -E “this|orThis”
grep "error" logfile.txt | grep "database"

netstat: list active network connections and listening ports

sudo netstat -tuln

See permission of a file (numeric) :

stat -c "%a"

Checksum

sha512sum file.txt

Containers and Kubernetes

Podman:

podman build -t registry.killer.sh:5000/image-verify:v2 .
podman run registry.killer.sh:5000/image-verify:v2 # to test your changes
podman push registry.killer.sh:5000/image-verify:v2

Check user RBAC

k auth can-i list secret --as gianna

How add a command into a pod:

command: ["sleep", "10"]

command: ["echo"]      # executed command
args: ["Hello, World"] # arguments

command: ["/bin/sh", "-c"]
args: ["echo 'Nginx Started'; nginx -g 'daemon off;'"]

grep all image used in a namespace / in a deployment

k get pods -n nato -o yaml | grep "image: "
k get deploy xym -o yaml | grep "image: "

Get all field of a security context:

kubectl explain pod.spec.securityContext --recursive

Crictl: interacting with Container Runtime Interface (CRI)-compatible container runtimes

crictl ps
crictl inspect <container id>