Prove the Node Is Actually Serving
A node that answerssystemctl status is not necessarily serving traffic. The process can be running while the listener never bound, or the listener can be up while local DNS resolution is dead — and in both cases users see failures that look like network problems, so the proxy is the last thing anyone checks.
Run these checks first. Everything else in validation assumes the service is genuinely up.
Validate prerequisites
Confirm:- SafeSquid is installed on the host under test.
- You have shell access to the SafeSquid server.
- The approved proxy listener port is known and recorded in the change record.
Prove the listener bound
Run the listener check on the SafeSquid server:Prove the process is alive
Active: active (running) and no recent startup errors.
Read the startup lines even when the state is active. A service that restarted minutes ago is reporting health for a process that has not yet been under load.
Prove local DNS resolution
SafeSquid cannot categorise or reach a destination it cannot resolve. Where integrated DNS security is deployed, BIND9 is part of the service, not a separate concern.example.com.
If resolution fails:
- Check BIND9 service state with
systemctl status bind9 --no-pager. - Check
/etc/bind/named.conffor syntax or forwarder errors. - Use BIND to repair local DNS service configuration.
Capture service evidence
Store these artifacts with the deployment record:ss -lntpoutput showing the bound proxy listener.systemctl status safesquidoutput, including the startup lines.nslookupoutput from the SafeSquid host.- The date of the check and the named owner of the node.
Troubleshoot service failures
Next steps
- Proxy Connectivity - prove a client can actually reach the listener.
- Production-Readiness Checklist - work through the full validation sequence.
- Monit - keep the service supervised after validation passes.