Multi-line change

C-q    # after rip-grep
:cdo %s/old/new/g          # apply the regex accross all the quick fixlist

Context & Namespace

k config get-contexts                       # List all contexts
k config current-context                    # Show current context

Pods

k exec -it pod_name -c container_name -n namespace -- bash   # Exec into a container shell
k logs pod_name -c container_name -n namespace                # View logs for container
k logs --previous pod_name -c container_name -n namespace     # View logs from previous crash
k logs pod_name --all-containers -n namespace                 # View logs from all containers
k top po pod_name --containers -n namespace                   # Show CPU & memory usage per container
k delete po pod_name -n namespace                             # Delete pod

Deployments

k rollout restart deploy deploy_name -n namespace   # Restart a deployment

HPA & Events

k describe hpa hpa_name -n namespace                # Describe HPA details
k get ev --field-selector involvedObject.name=obj_name -n namespace   # Get events for specific object

Stop typing long SSH commands! Use ~/.ssh/config:

Host prod-server
    HostName 192.168.1.100
    User deploy
    Port 2222
    IdentityFile ~/.ssh/prod_key
    ForwardAgent yes

Host dev-*
    User developer
    Port 22
    IdentityFile ~/.ssh/dev_key

Now just type: ssh prod-server or ssh dev-anything

Host frontend-github
    HostName github.com
    User git
    IdentityFile ~/.ssh/ssh-frontend
    IdentitiesOnly yes

git clone git@frontend-github:repo_link.git # replace github.com with frontend-github after key is added.

Quick commands to clean up Docker system resources:

# Remove all stopped containers
docker container prune -f

# Remove unused images
docker image prune -a -f

# Remove unused volumes
docker volume prune -f

# Nuclear option - clean everything
docker system prune -a --volumes -f

Always be careful with the nuclear option in production!

🎨 Bash Prompt in 10 Colors#

Python one-liners :

# Start a simple HTTP server
python -m http.server 8000

# Pretty print JSON
python -m json.tool file.json

# Check if port is open
python -c "import socket; print(socket.create_connection(('localhost', 8080)))"

# Generate random password
python -c "import secrets, string; print(''.join(secrets.choice(string.ascii_letters + string.digits) for _ in range(12)))"

Been thinking about monitoring lately…

Good monitoring tells you:

• What happened
• When it happened
• Why it might have happened

Great monitoring tells you:

• What’s about to happen
• What to do about it
• How to prevent it next time

The goal isn’t to monitor everything. It’s to monitor the right things that help you make decisions.