Infrastructure Patterns

Parallel SSH across hosts — run uptime on 4 hosts concurrently

cat <<'EOF' | xargs -P4 -I{} ssh -o ConnectTimeout=5 {} uptime
192.168.1.10
192.168.1.11
192.168.1.12
192.168.1.13
EOF

Docker container cleanup — remove all stopped containers

docker ps -aq --filter status=exited | xargs -r docker rm

Docker dangling image cleanup — reclaim disk from untagged images

docker images -q --filter dangling=true | xargs -r docker rmi

kubectl pod restart — delete pods matching a label to trigger reschedule

kubectl get pods -l app=nginx -o name | xargs -n1 kubectl delete

Systemd service restart — restart a list of services

printf 'sshd\nnginx\npostgresql\n' | xargs -n1 sudo systemctl restart

Certificate expiry check across hosts — parallel TLS inspection

cat <<'EOF' | xargs -P4 -I{} sh -c 'echo "--- {} ---"; echo | openssl s_client -servername {} -connect {}:443 2>/dev/null | openssl x509 -noout -dates'
docs.domusdigitalis.dev
github.com
archlinux.org
EOF

Parallel pacman package info query

printf 'vim\nzsh\ngit\ntmux\n' | xargs -P4 -I{} pacman -Qi {}

Multi-repo git status — check all repos in a directory

ls -d ~/atelier/_bibliotheca/domus-*/ | xargs -I{} sh -c 'echo "=== {} ==="; git -C {} status --short'

Multi-repo git pull — parallel fetch across spokes

ls -d ~/atelier/_bibliotheca/domus-*/ | xargs -P4 -I{} git -C {} pull --ff-only

Bulk DNS lookup — parallel dig queries for a host list

cat <<'EOF' | xargs -P4 -I{} sh -c 'printf "%-30s %s\n" "{}" "$(dig +short {})"'
archlinux.org
github.com
docs.domusdigitalis.dev
cloudflare.com
EOF