marketplaces/docs/DEPLOYMENT.md

Deployment — server provisioning, CD, TLS

Frontend only. The backend service (:8080) is a separate developer's responsibility. API hostnames are separate reverse proxies and will return 502 until their upstream exists.

Multi-tenant, one bundle. Every customer domain is served by the same build. The SPA resolves its tenant from the Host header (BACKEND-HANDOFF §1a). One deploy updates every domain simultaneously — there is no per-tenant build and no per-tenant deploy.

The SPA derives its API origin from the complete storefront hostname: example.com uses api.example.com, and store1.example.com uses api.store1.example.com. Provision DNS, TLS, reverse proxying, and CORS for every derived API hostname. A single-label wildcard certificate does not cover nested names such as api.store1.example.com.

---

1. Files

Path	Purpose
scripts/deploy/server-setup.sh	One-time server provisioning. Idempotent. Run as root.
scripts/deploy/add-domain.sh	Attach one domain + issue TLS. Run per domain, as root, after DNS resolves.
.github/workflows/deploy.yml	CD: build → upload → atomic swap → verify. Triggers on push to main.

---

2. Layout on the server

/srv/marketplaces/
├── releases/
│   ├── a1b2c3d4e5f6/frontend/    <- one directory per deployed commit
│   └── ...                        (last 5 kept)
└── current -> releases/a1b2c3d4e5f6

nginx root is /srv/marketplaces/current/frontend. Activation is a symlink swap, so no request is ever served from a half-written directory, and a rollback is a symlink change rather than a rebuild.

---

3. First-time setup

3.1 Generate a CI deploy key

On your machine, not on the server:

ssh-keygen -t ed25519 -C "ci@marketplaces" -f ./marketplaces_deploy -N ""

Two files result. marketplaces_deploy.pub goes to the server; marketplaces_deploy (private) goes into CI secrets and nowhere else.

3.2 Provision the server

Copy scripts/deploy/ to the server and run:

sudo bash server-setup.sh --pubkey "$(cat marketplaces_deploy.pub)"

This installs nginx + certbot, creates a key-only deploy user with no password, writes the catch-all nginx config, opens 80/443/OpenSSH in ufw, and grants deploy exactly one sudo right: systemctl reload nginx.

Verify before continuing:

curl -I http://<server-ip>/health

Expect 200. A placeholder page is served until the first real deploy.

3.3 Capture the host key

ssh-keyscan -H <server-ip>

The output is the DEPLOY_KNOWN_HOSTS secret. Pinning it means a rebuilt or impersonated server fails the deploy instead of being trusted silently.

3.4 Add CI secrets

Secret	Value
DEPLOY_HOST	server IP or hostname
DEPLOY_USER	deploy
DEPLOY_SSH_KEY	contents of the private key file
DEPLOY_KNOWN_HOSTS	output of ssh-keyscan -H <server-ip>

3.5 Deploy

Push to main, or run the workflow manually with a ref. The workflow refuses to swap the symlink unless the uploaded release contains an index.html, so a failed upload leaves the previous release serving.

---

4. Domains and TLS — dynamic by default

Domains arrive continuously: one today, five tomorrow. Nothing here requires a person per domain.

HTTP already needs zero configuration. The nginx catch-all serves any Host, and the SPA resolves its tenant from that header. Point a domain's A record at the server and it works over port 80 immediately. Only TLS needs a certificate per name — that is the whole problem this section solves.

Two mechanisms, used together:

4.1 Wildcard — tenants on our own apex

One certificate covers every <slug>.<apex>. A new tenant subdomain is then live over HTTPS the moment DNS resolves, with no certificate work at all.

sudo bash setup-wildcard-tls.sh \
  --apex marketplaces.example.com \
  --email ops@example.com \
  --dns cloudflare --creds /root/cloudflare.ini

Wildcards require DNS-01 validation, so certbot must write a _acme-challenge TXT record. With a provider plugin (cloudflare, route53) renewal is unattended. --dns manual works but prompts for a TXT record at every renewal — fine to prove the setup out, not acceptable as a steady state.

Hostinger has no certbot plugin. If DNS lives there: either move DNS to a provider that has one (Cloudflare is free, minutes of work), or drive issuance from the Phase 9 domain-automation API once it exists.

4.2 Reconciler — tenants on their own domains

A wildcard cannot cover a customer's own domain. sync-domains.sh runs on a 10-minute timer and reconciles the live set against a desired list:

• issues certificates for domains that lack one
• skips domains whose certificate has more than 30 days left
• skips subdomains already covered by WILDCARD_APEX
• leaves domains alone while their DNS has not propagated yet, and retries next tick
• disables server blocks for domains removed from the source — without deleting the certificate, so re-adding one later is instant
• caps issuance per run, so a misconfigured source cannot burn the weekly ACME budget in a single pass

Configure /etc/marketplaces/domains.env:

DOMAINS_SOURCE=file:/etc/marketplaces/domains.txt
CERTBOT_EMAIL=ops@example.com
MAX_ISSUE_PER_RUN=10

Then:

sudo systemctl enable --now marketplaces-domains.timer
sudo /srv/marketplaces/bin/sync-domains.sh --dry-run   # see the plan, change nothing

Adding a domain becomes: append a line to /etc/marketplaces/domains.txt (or add the row in the backend registry), point DNS, wait one tick.

4.3 Backend-driven, once Phase 9 ships

Point the reconciler at the registry instead of a file and the loop closes — MarketplaceDomain already carries exactly the statuses this needs (planned → dns_pending → ssl_pending → active → failed):

DOMAINS_SOURCE=https://api.example.com/api/admin/v2/domains
DOMAINS_API_TOKEN=...

The script accepts a bare JSON array of hostnames, or objects with domain + status, in which case it acts only on active rows. A fetch failure aborts the run rather than reading as "remove every domain."

4.4 One-off

For a single domain, outside the reconciler:

sudo bash add-domain.sh shop.example.com --email ops@example.com --with-www

4.5 Verify

curl -I https://shop.example.com/health
sudo certbot certificates
journalctl -u marketplaces-domains.service --since "1 hour ago"

---

5. Rollback

ssh deploy@<server-ip>
ls -1dt /srv/marketplaces/releases/*/     # newest first
ln -sfnT /srv/marketplaces/releases/<sha> /srv/marketplaces/current.new
mv -Tf /srv/marketplaces/current.new /srv/marketplaces/current
sudo systemctl reload nginx

Only the last 5 releases are retained. Older ones need a rebuild from the tag.

---

6. Operational checks

curl -I http://<host>/health                    # 200 from nginx
readlink -f /srv/marketplaces/current           # which commit is live
sudo nginx -t                                   # config valid
systemctl status nginx certbot.timer            # both active
sudo tail -f /var/log/nginx/marketplaces.error.log

---

7. Known limits

• /api/ 502s until the backend runs. Expected. nginx proxies to 127.0.0.1:8080; nothing listens there yet.
• No staging environment. main goes straight to production. Adding one means a second server plus a staging branch trigger.
• No smoke test beyond HTTP 200. The verify step confirms nginx serves the shell, not that the app boots. A real check needs the E2E harness from Track Q.
• Caching. index.html is no-store; hashed assets are immutable for a year. A deploy therefore takes effect on the next page load, with no cache purge.