Notes

Rsync

$ rsync -avzhe 'ssh -p [port_number]' -P [user@remote_ip]:/path/to/file/source /path/to/file/destination

Scan IP on Network

$ nmap -sP [ip_address/prefix]

Search Available Version of Spesific Package on Debian Based OS

$ apt list -a <package_name>

Install Spesific Kubernetes Version

$ sudo apt update;sudo apt install -qy kubelet=1.15.5-00 kubectl=1.15.5-00 kubeadm=1.15.5-00

Open Spesific Port on Centos 7

iptables -I INPUT 5 -p tcp -m state --state NEW -m tcp --dport 9100 -j ACCEPT

Replace String Using Sed

sed -i 's/old-string/new-string/g'

Find and copy files

find /var/cache/dnf -iname "*.rpm" -exec cp {} packages/ \;

Encrypt secret envar value using Google KMS

echo -n "This is my secret" | gcloud kms encrypt --plaintext-file=- --ciphertext-file=- --location=global --keyring=mykeyring --key=myappkey | base64 -w 0

Encrypt file using Google KMS

gcloud kms encrypt \
    --key myappkey \
    --keyring mykeyring \
    --location global  \
    --plaintext-file application.properties \
    --ciphertext-file application.properties.enc

Check DNS record

$ dig +noall +answer google.com

google.com.		204	IN	A	74.125.24.102
google.com.		204	IN	A	74.125.24.138
google.com.		204	IN	A	74.125.24.139
google.com.		204	IN	A	74.125.24.101
google.com.		204	IN	A	74.125.24.100
google.com.		204	IN	A	74.125.24.113

Check service port

$ getent services 53

domain                53/tcp

Troubleshoot SELinux Issue on RHEL/CentOS

# 1. Find your error from journalctl or audit.log then get the audit ID.

# 2. Analyze
grep 1624284378.419:2066 /var/log/audit/audit.log |audit2why

Replace multiple file on OSX

find /to/my/path -type f -name "*.yaml" -exec sed -i '' -e 's/halo.com/hai.id/g' {} \;

Generate Kubernetes secret and configmap YAML manifest

# Secret
kubectl create secret generic my-config --from-file=configuration/ -o yaml --dry-run

# Configmap
kubectl create configmap my-config --from-file=configuration/ -o yaml --dry-run

Generate docker credential secret for Kubernetes

kubectl create -n registry secret docker-registry registry-auth-dockerconfig-secret --docker-server=registry.rahmatawe.com --docker-username=[YOUR_USERNAME] --docker-password=[YOUR_REGISTRY_PASSWORD] --dry-run=client -oyaml

Running short-lived container to compile source code

$ sudo docker run --rm -it -v ${PWD}:/app -w /app openjdk:11-jdk-slim /bin/sh -c ./gradlew buildRun