FRSLinkCheck: Complete Guide to Setup and Best Practices
What FRSLinkCheck Does
FRSLinkCheck monitors, validates, and reports on the health of links used by your systems or applications. It detects broken links, redirects, slow responses, and changes in content or HTTP status so you can fix issues before they affect users.
Prerequisites
- A server or environment with network access to the URLs you need to monitor.
- Access credentials or API keys if monitoring protected resources.
- Basic familiarity with the command line and scheduling tools (cron, systemd timers).
- Logging and alerting endpoints (email, Slack, webhooks) you want to use.
Installation (assumes Linux)
- Download the latest FRSLinkCheck package or clone the repository:
- Use the provided tarball or git clone URL from your distribution source.
- Extract and install:
Code
sudo tar -xzf frslinkcheck.tar.gz -C /opt/ sudo ln -s /opt/frslinkcheck/frslinkcheck /usr/local/bin/frslinkcheck - Install dependencies (example using apt):
Code
sudo apt update sudo apt install -y python3 python3-venv python3-pip cd /opt/frslinkcheck python3 -m venv venv source venv/bin/activate pip install -r requirements.txt
Basic Configuration
- Config file location: /etc/frslinkcheck/config.yml (create if absent).
- Core settings to set:
- targets: list of URLs or files with URLs to scan.
- concurrency: number of simultaneous requests (default 10).
- timeout: request timeout in seconds (default 10).
- user_agent: custom User-Agent string.
- followredirects: true/false.
- auth: credentials or token for protected endpoints.
Example config snippet:
yaml
targets: - https://example.com - https://api.example.com/health concurrency: 15 timeout: 8 user_agent: “FRSLinkCheck/1.0 (+https://example.com)” followredirects: true
Running a Scan
- One-off scan:
Code
frslinkcheck –config /etc/frslinkcheck/config.yml –run-once –output /var/log/frslinkcheck/report.json - Continuous mode:
Code
frslinkcheck –config /etc/frslinkcheck/config.yml –daemon
Scheduling
- Cron example (run hourly):
Code
0 * * * * /usr/local/bin/frslinkcheck –config /etc/frslinkcheck/config.yml –run-once –output /var/log/frslinkcheck/report-$(date +%F-%H).json - Systemd timer example: create frslinkcheck.service and frslinkcheck.timer units to run at your desired interval.
Alerts and Integrations
- Email: configure SMTP settings in config.yml and set alert thresholds (e.g., >5% broken links).
- Slack/Webhooks: set webhook URL and payload template.
- PagerDuty: integrate via webhook with critical-level alerts.
- CI Integration: run as part of pull request checks to prevent commits introducing broken links.
Best Practices
- Start with a conservative concurrency and increase while monitoring server and network load.
- Use a dedicated user agent and respect robots.txt when scanning public sites.
- Schedule scans during off-peak hours for target servers.
- Maintain a baseline report to detect regressions over time.
- Exclude known ephemeral URLs (tracking, analytics) to reduce noise.
- Use rate limiting and retries with exponential backoff.
- Store historical reports for trend analysis and root-cause investigation.
Troubleshooting
- High false positives: increase timeout, reduce concurrency, or add retries.
- Slow scans: lower concurrency or use distributed scanning agents.
- Authentication failures: verify credentials, token refresh, and scopes.
- Permission errors writing reports: check file ownership and service user.
Example Workflow
- Add target list and auth in /etc/frslinkcheck/config.yml.
- Run an initial full scan with low concurrency.
- Review report, whitelist acceptable failures.
- Schedule hourly scans and configure Slack alerts for new critical failures.
- Add scan to PR checks to catch link regressions before merging.
Maintenance
- Update FRSLinkCheck monthly for security and feature updates.
- Rotate alert thresholds and review whitelists quarterly.
- Archive reports older than 90 days unless needed for compliance.
Quick Reference Commands
- Run once: frslinkcheck –config /etc/frslinkcheck/config.yml –run-once
- Daemon: frslinkcheck –config /etc/frslinkcheck/config.yml –daemon
- Version: frslinkcheck –version
If you want, I can generate a sample /etc/frslinkcheck/config.yml tailored to a typical web app and CI pipeline.
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