crowdsec skill

CrowdSec — operations, deployment, configuration, and debugging

Glossary: AppSec is the engine component name (in configs, hub paths, cscli appsec-*, Helm workload); WAF is the user-facing term for the same thing. This skill uses both interchangeably.

Boundary — what this skill does and does not do

You want to…	Use
Install / upgrade / uninstall CrowdSec	this skill
Configure acquisition, hub, profiles, notifications	this skill
Install and wire a bouncer (firewall, nginx, traefik, caddy)	this skill
Deploy the WAF (AppSec component)	this skill
Deploy and tune bot detection (AppSec challenge mode)	this skill
Debug "logs not parsing" / "no alerts" / "bouncer not blocking"	this skill
Migrate from fail2ban	this skill
Write a parser, scenario, or WAF (AppSec) rule	the crowdsec-local-mcp mcp
Drive the cloud Service API (manage blocklists / allowlists / firewall integrations / metrics / decisions programmatically)	the crowdsec-service-api skill

Step 1 — Detect the environment

Run probes in this order. Stop at the first match.

# systemd / bare-metal
systemctl list-unit-files crowdsec.service >/dev/null 2>&1 && systemctl is-enabled crowdsec >/dev/null 2>&1
# docker
docker ps --format '{{.Names}} {{.Image}}' 2>/dev/null | grep -E '(^|/)(crowdsec)([: ]|$)'
# kubernetes
kubectl get pods -A 2>/dev/null | grep -i crowdsec

If nothing matches and the user reports CrowdSec is installed, ask where: a vendor appliance, a custom image, a binary in /opt/, or a remote host. Otherwise pivot to install: see references/install/.

pfSense detection:

uname -i   # → pfSense  (pfSense CE or Plus)

If confirmed pfSense, go directly to references/install/pfsense.md — paths, service names, and activation flow are entirely different from Linux/systemd.

Privileges — bare-metal / systemd prerequisite

On bare-metal/systemd, cscli and crowdsec need root (they read /etc/crowdsec/, the DB under /var/lib/crowdsec/, and control the systemd unit). Before running anything that touches config or state, confirm the user is root or has sudo:

id -u   # 0 = root; otherwise the user needs sudo

If they are neither root nor a sudoer, stop and ask them to grant it — don't guess. Once confirmed, run bare-metal commands as root or prefixed with sudo. Docker/k8s commands run inside the container/pod and do not need this.

Step 1.5 — Version & install-source sanity check (Linux)

Do this first on any install task and on any "weird behavior" report (missing cscli commands/flags, hub items that won't install, behavior ≠ docs). An engine installed from the wrong source can be years behind — a Linux-distro-only trap.

Compare the running engine to the latest published release:

curl -s https://version.crowdsec.net/latest    # → {"tag_name":"v1.7.8",...}; parse tag_name
cscli version                                  # bare-metal: prefix sudo

Then check where the package came from:

# Debian/Ubuntu
apt-cache policy crowdsec                       # read the *** installed line's origin
ls /etc/apt/sources.list.d/ | grep -i crowdsec
# RHEL-family
dnf info crowdsec ; dnf repolist | grep -i crowdsec

The official source is the packagecloud repo (packagecloud.io/crowdsec/crowdsec, repo id crowdsec_crowdsec). A distro origin (archive.ubuntu.com, deb.debian.org, ports.ubuntu.com) — or no crowdsec repo file at all — means it was installed from the distro's own ancient package.

Rule: if the source isn't the official repo or the version is well behind tag_name, treat it as a likely-outdated install — stop debugging config and migrate onto the official repo first: references/operate/upgrades.md § Detect & fix an outdated / distro-packaged install.

Docker/Kubernetes: no repo-source trap — the version is the image tag pulled from Docker Hub. If it's far behind version.crowdsec.net/latest, pull a newer tag (references/operate/upgrades.md happy path).

Step 1.6 — Feature compatibility

Some features only exist past a given engine version, and a few also need a capable bouncer. Check here before debugging "the config is right but nothing happens" — on an older engine the answer is an upgrade, not a config change.

Feature	Min engine	Also needs	Docs
Bot detection (AppSec challenge mode) — alpha	1.8.0	A bot-detection-capable bouncer (nginx, OpenResty, HAProxy SPOA, Traefik, Envoy) and a host that can run WASM in compiler mode	references/appsec/bot-detection/
Glob patterns in appsec_configs	1.8.0	—	references/appsec/bot-detection/deploy.md § 2

Version-gated behaviour is recorded here rather than repeated in each reference doc — when a feature is added, give it a row instead of sprinkling "x.y+" through the prose.

Step 2 — Detect the intent

Cue from user	Go to
"install", "set up", "fresh box", "how do I start"	references/install/ (pick file by env)
"pfsense", "pfSense", "netgate"	references/install/pfsense.md
"configure logs / acquisition", "read journald / syslog / docker logs"	references/configure/acquisition.md
"install a collection / parser / scenario", "hub", "tainted"	references/configure/hub.md
"ban duration", "captcha", "decisions", "simulation", "alerts but no bans"	references/configure/profiles.md
"allowlist my office / CDN / monitoring IP", "I'm getting blocked by CAPI", "exclude IP from any ban"	references/configure/allowlists.md
"whitelist vs allowlist vs postoverflow", "which suppression layer should I use"	references/configure/allowlists.md § Suppression mechanisms
"test my whitelist works", "is my postoverflow / dynamic-IP whitelist actually firing"	references/configure/allowlists.md § Verification — does a whitelist actually work?
"notifications", "alert me on slack/email/webhook", "notification not firing"	references/configure/notifications.md
"block at the firewall", "iptables", "nftables", "ipset"	references/configure/bouncers/firewall.md
"nginx bouncer", "lua / openresty module"	references/configure/bouncers/web-servers.md § nginx
"haproxy bouncer", "SPOA / SPOE"	references/configure/bouncers/web-servers.md § haproxy
"apache bouncer", "mod_crowdsec"	references/configure/bouncers/web-servers.md § apache
"traefik bouncer", "traefik plugin / middleware"	references/configure/bouncers/web-servers.md § Traefik
"caddy bouncer", "caddy module / xcaddy"	references/configure/bouncers/web-servers.md § Caddy
"wrong source IP", "real client IP", "behind Cloudflare / reverse proxy / NPM", "X-Forwarded-For", "everyone shows as the proxy IP"	references/configure/bouncers/web-servers.md — per-bouncer real-IP/trusted-proxy sections
"AppSec", "WAF", "virtual patching", "block by request shape"	references/appsec/ — overview, deploy, configure, troubleshoot
"bot detection", "challenge mode", "JS challenge", "proof of work", "block headless browsers / puppeteer / selenium / scrapers", "let Googlebot through"	references/appsec/bot-detection/ — overview, deploy, configure, customize, troubleshoot
"Console", "enroll", "share signals"	references/install/console.md
"upgrade", "back up", "roll back", "new version", "tainted items after upgrade"	references/operate/upgrades.md
"old/outdated version", "cscli command or flag missing", "hub item won't install", "behavior doesn't match the docs", "installed from the distro package"	references/operate/upgrades.md § Detect & fix an outdated / distro-packaged install (see Step 1.5 above)
"multiple agents", "remote LAPI", "mTLS", "postgres backend"	references/operate/multi-server.md (partial — machine cleanup done, rest stub)
"stale machines / log processors in cscli machines list", "prune dead agents", "ephemeral k8s pods piling up"	references/operate/multi-server.md § Decommissioning stale machines
"is it working?", "smoke test", "validate install", "verify setup", "did detection / WAF / blocking actually wire up?"	references/operate/health-check.md
Debug — common · "it's broken" / "not working" / general diagnosis	references/debug/common/triage.md → run bash ${CLAUDE_SKILL_DIR}/scripts/diagnose.sh
Debug — common · specific error string	references/debug/common/errors.md
Debug — common · "container can't see logs", "mount", "SELinux/AppArmor denied", "k8s RBAC / DaemonSet"	references/debug/common/platform-gotchas.md
Debug — by symptom · "logs not parsed", "0 parsed"	references/debug/symptoms/parsing.md
Debug — by symptom · "no alerts firing"	references/debug/symptoms/no-alerts.md
Debug — by symptom · "decision exists but not blocked"	references/debug/symptoms/not-blocked.md
Debug — by symptom · "bouncer blocks everything", "locked out of all services", "every request 403 after adding the bouncer"	references/debug/symptoms/not-blocked.md § 7 — Inverse symptom
Debug — by feature · AppSec/WAF not blocking, false positives, captcha	references/appsec/troubleshoot.md
Debug — by feature · challenge never served, endless challenge loop, real crawlers being challenged, everything blocked after enabling bot detection	references/appsec/bot-detection/troubleshoot.md
"switch from fail2ban"	references/migrate/from-fail2ban.md (TODO — stub)

For anything debug-shaped, the first move is almost always:

bash ${CLAUDE_SKILL_DIR}/scripts/diagnose.sh

(or --env docker --container <name> / --env k8s --namespace ... --pod ...).

Step 3 — Universal cscli cheat sheet

These work in every environment. On bare-metal/systemd, prefix with sudo (unless you are root) — see Privileges above. In docker/k8s prefix with docker exec <name> / kubectl exec -n <ns> <pod> -- (which run as root inside the container/pod).

Purpose	Command
Engine version	cscli version
Effective config (paths, LAPI URL, DB type)	cscli config show
One-shot triage table	cscli metrics
Recent alerts	cscli alerts list -l 50
Active bans	cscli decisions list
Delete one ban	cscli decisions delete -i <ip>
Hub state (installed + tainted/missing flags)	cscli hub list
Refresh hub index, then upgrade items	cscli hub update && cscli hub upgrade
Allowlists — list / check one IP / add	cscli allowlists list, cscli allowlists check <ip>, cscli allowlists add <name> <ip>
List bouncers and their last pull time	cscli bouncers list
List agents registered to this LAPI	cscli machines list
LAPI reachable (agent→LAPI)	cscli lapi status
CAPI/Console connectivity (enrolled, pulling/sharing)	cscli capi status
Console feature toggles (custom/manual/tainted/context/console_management)	cscli console status
Enroll this engine in the Console	cscli console enroll <key> then reload (see references/install/console.md)
Replay a log file through parsers (read-only)	cscli explain --file <path> --type <syslog|nginx|...>
Replay a single log line	cscli explain --log '<line>' --type <type>
Validate config after editing any yaml (acquisition/profiles/config)	crowdsec -t (bare-metal; also auto-runs on systemctl reload) — then confirm the source reads with cscli metrics show acquisition
See simulation state (alerts but no decisions)	cscli simulation status
Inspect decision profiles (filters / ban duration)	cat /etc/crowdsec/profiles.yaml — there is no cscli profiles command (through v1.7.8); see references/configure/profiles.md

Where things live on a default bare-metal install:

• Binaries: /usr/bin/crowdsec, /usr/bin/cscli
• Config root: /etc/crowdsec/
• Acquisition: /etc/crowdsec/acquis.yaml and/or /etc/crowdsec/acquis.d/*.yaml
• Hub items: /etc/crowdsec/hub/, enabled symlinks under /etc/crowdsec/{parsers,scenarios,collections,postoverflows,contexts}/
• Local overrides: */parsers/*/_custom/, */scenarios/*/_custom/, etc.
• Data (sqlite DB, geoip): /var/lib/crowdsec/data/
• Logs: /var/log/crowdsec.log (agent) and /var/log/crowdsec_api.log (LAPI)
• LAPI default listen: 127.0.0.1:8080
• Systemd unit: crowdsec.service

Step 4 — Hard don'ts

Confirm with the user before any of these:

• cscli decisions delete --all — wipes every active ban including CAPI-pulled blocklists. Use targeted delete -i, delete -r, delete --id, delete --origin lists --scenario <name>.
• Editing hub-managed files under /etc/crowdsec/{parsers,scenarios,collections,postoverflows,contexts}/ instead of the sibling _custom/ directory — see references/debug/common/triage.md § Hard don'ts.
• Disabling a signature collection wholesale to silence a false positive — pick the right suppression layer (allowlist / whitelist parser / postoverflow) per references/configure/allowlists.md § Suppression mechanisms.
• Mutating host firewall state (firewall bouncer install, ipset flush, iptables↔nftables switch) without confirming — the firewall bouncer can wipe rule chains other tools depend on.
• Skipping --reset-then-reuse-values on helm upgrade crowdsec — silently drops values.

Docs

Canonical reference: https://docs.crowdsec.net/. Each file in references/ cites the specific page it relies on — follow the link rather than paraphrasing from memory.