Tower Template

GitHub Actions template repository for running network health checks with tower.

Usage

1. Click Use this template → Create a new repository
2. Edit .github/workflows/tower-health.yml with your targets
3. Commit — checks run on schedule and on push

Included workflows

Workflow	Schedule	Checks
tower-health.yml	Every 6 hours	TCP, HTTP, HTTPS (no warn), DNS
tls-cert-expiry.yml	Daily at 8am	HTTPS TLS cert validity

Adding cert expiry warnings

The composite action doesn't expose warn_if_expiring directly. To get cert expiry warnings, create a config file and use the config input:

# .github/tower/checks.yml
checks:
  - type: https
    host: "example.com"
    warn_if_expiring: 720h   # warn if cert expires within 30 days

# .github/workflows/health-check.yml
steps:
  - uses: actions/checkout@v4       # needed to read the config file
  - uses: mismatched/tower@master
    with:
      config: '.github/tower/checks.yml'

The action fails if any check returns "OK": false or if a cert expiry warning is triggered.