$ df -h # Check disk usage du -sh /var/log/* | sort -rh | head -10 # Find what's using space -weight: 600;">sudo journalctl --vacuum-time=14d # Clear old system logs -weight: 500;">docker system prune -f # Clear unused Docker data find /tmp -mtime +7 -delete # Clear old temp files df -h # Check disk usage du -sh /var/log/* | sort -rh | head -10 # Find what's using space -weight: 600;">sudo journalctl --vacuum-time=14d # Clear old system logs -weight: 500;">docker system prune -f # Clear unused Docker data find /tmp -mtime +7 -delete # Clear old temp files df -h # Check disk usage du -sh /var/log/* | sort -rh | head -10 # Find what's using space -weight: 600;">sudo journalctl --vacuum-time=14d # Clear old system logs -weight: 500;">docker system prune -f # Clear unused Docker data find /tmp -mtime +7 -delete # Clear old temp files # Compare what your app expects vs what's in production cat .env.example | grep -v '^#' | grep '=' | cut -d= -f1 | sort > /tmp/expected.txt printenv | cut -d= -f1 | sort > /tmp/actual.txt diff /tmp/expected.txt /tmp/actual.txt # Compare what your app expects vs what's in production cat .env.example | grep -v '^#' | grep '=' | cut -d= -f1 | sort > /tmp/expected.txt printenv | cut -d= -f1 | sort > /tmp/actual.txt diff /tmp/expected.txt /tmp/actual.txt # Compare what your app expects vs what's in production cat .env.example | grep -v '^#' | grep '=' | cut -d= -f1 | sort > /tmp/expected.txt printenv | cut -d= -f1 | sort > /tmp/actual.txt diff /tmp/expected.txt /tmp/actual.txt .env.example # Is the DB -weight: 500;">service running? -weight: 600;">sudo -weight: 500;">systemctl -weight: 500;">status postgresql ss -tlnp | grep 5432 # Can you connect directly? psql -h localhost -U youruser -d yourdb # Check pg_hba.conf for auth issues -weight: 600;">sudo tail -20 /etc/postgresql/*/main/pg_hba.conf -weight: 600;">sudo tail -50 /var/log/postgresql/*.log # Is the DB -weight: 500;">service running? -weight: 600;">sudo -weight: 500;">systemctl -weight: 500;">status postgresql ss -tlnp | grep 5432 # Can you connect directly? psql -h localhost -U youruser -d yourdb # Check pg_hba.conf for auth issues -weight: 600;">sudo tail -20 /etc/postgresql/*/main/pg_hba.conf -weight: 600;">sudo tail -50 /var/log/postgresql/*.log # Is the DB -weight: 500;">service running? -weight: 600;">sudo -weight: 500;">systemctl -weight: 500;">status postgresql ss -tlnp | grep 5432 # Can you connect directly? psql -h localhost -U youruser -d yourdb # Check pg_hba.conf for auth issues -weight: 600;">sudo tail -20 /etc/postgresql/*/main/pg_hba.conf -weight: 600;">sudo tail -50 /var/log/postgresql/*.log # Track memory usage over time while true; do ps -o pid,vsz,rss,comm -p $(pgrep node) >> /tmp/memory_log.txt sleep 60 done # For Node.js — generate a heap snapshot kill -USR2 <PID> # Generates heapdump if using --inspect # Or use clinic.js npx clinic doctor -- node server.js # Track memory usage over time while true; do ps -o pid,vsz,rss,comm -p $(pgrep node) >> /tmp/memory_log.txt sleep 60 done # For Node.js — generate a heap snapshot kill -USR2 <PID> # Generates heapdump if using --inspect # Or use clinic.js npx clinic doctor -- node server.js # Track memory usage over time while true; do ps -o pid,vsz,rss,comm -p $(pgrep node) >> /tmp/memory_log.txt sleep 60 done # For Node.js — generate a heap snapshot kill -USR2 <PID> # Generates heapdump if using --inspect # Or use clinic.js npx clinic doctor -- node server.js # Compare env vars between staging and production # On staging: printenv | sort > /tmp/staging_env.txt # On production: printenv | sort > /tmp/prod_env.txt # Compare diff /tmp/staging_env.txt /tmp/prod_env.txt # Check if production has different Node/Python version node --version python3 --version # Compare env vars between staging and production # On staging: printenv | sort > /tmp/staging_env.txt # On production: printenv | sort > /tmp/prod_env.txt # Compare diff /tmp/staging_env.txt /tmp/prod_env.txt # Check if production has different Node/Python version node --version python3 --version # Compare env vars between staging and production # On staging: printenv | sort > /tmp/staging_env.txt # On production: printenv | sort > /tmp/prod_env.txt # Compare diff /tmp/staging_env.txt /tmp/prod_env.txt # Check if production has different Node/Python version node --version python3 --version