Make Ghost Docker Compose stack ephemeral #93
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Deploy Ghost Compose configuration via Ignition at boot time while
keeping secrets and persistent data on block storage.
Architecture changes:
- Config files deployed to /etc/ghost-compose/ (ephemeral via Ignition)
- Secrets remain at /var/mnt/storage/ghost-compose/.env.secrets
- Caddyfile uses {$VAR} environment variable substitution
- compose.yml sources both .env.config and .env.secrets
Files added:
- opentofu/modules/vultr/instance/userdata/ghost-compose/ templates
- docs/runbooks/env-secrets-migration.md
Files modified:
- ghost.bu: adds storage.files for ghost-compose config
- ghost-compose.service: WorkingDirectory now /etc/ghost-compose
- instance module: templatefile processing and new variables
- workflows: pass TF_VAR_admin_ip for Caddy ACL
- CLAUDE.md: document new architecture and upstream sync workflow
Closes: GHO-46, GHO-47, GHO-48, GHO-49, GHO-50, GHO-51, GHO-52, GHO-53, GHO-54
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Summary
This PR makes the Ghost Docker Compose stack configuration ephemeral by deploying it via Ignition at boot time, while keeping secrets and persistent data on block storage.
Architecture
compose.yml/etc/ghost-compose/.env.config/etc/ghost-compose/.env.secrets/var/mnt/storage/ghost-compose/caddy/*/etc/ghost-compose/caddy/mysql-init/*/etc/ghost-compose/mysql-init/Key Changes
compose.yml.tftpl,env.config.tftpl, Caddyfile, and snippets underopentofu/modules/vultr/instance/userdata/ghost-compose/ghost.buto deploy config files to/etc/ghost-compose/ghost-compose.serviceWorkingDirectory to/etc/ghost-composeghost_domain,ghost_admin_domain,admin_ip,mail_smtp_userto instance moduleTF_VAR_admin_ipfor Caddy ACL configurationSecurity
.env.configwith non-sensitive values.env.secretson block storage with 0600 permissions{$HEALTH_CHECK_TOKEN}environment variable instead of hardcoded valueMigration
Before deploying, follow the migration runbook at
docs/runbooks/env-secrets-migration.mdto:.env.secretson block storage with the required secretsNote: This will recreate the instance (Ignition config is immutable).
Test Plan
.env.secretscreated on block storage before deployment/etc/ghost-compose/filesLinear Issues
Closes GHO-46, GHO-47, GHO-48, GHO-49, GHO-50, GHO-51, GHO-52, GHO-53, GHO-54