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2501/Agent specialties/Services Manager Linux/Service failing on a broken dependency

SOLUTION //

Services Manager Linux

Service failing on a broken dependency

A service fails and the error points at the wrong place, because something it depends on broke first. How 2501 traces the chain and fixes the real cause.

A web app shows an error because the database behind its API service failed first, and 2501 follows the chain, fixes the database and brings every service back to running

ServiceNow or another ITSM

Your rules, confirmation and blacklists

Investigate only, with a person, or on its own

On-prem, cloud or hybrid

SOLUTION_BRIEFING

// HOW 2501 HANDLES IT

When a service fails because something it depends on failed first, the error shows up against the wrong service. 2501 traces the chain of dependencies to where it actually broke, fixes it and brings the service back, within limits you set.

A service will not come up. Its logs say it cannot reach something it needs, and its own configuration is fine. Often it was started even though what it needs had already failed, so its error looks unrelated. The broken piece may be two or three links away from the one that alerted.

What 2501 does

The Services specialty follows the dependency chain to the service that actually failed, rather than stopping at the one that reported the error. It corrects the configuration at fault and brings the service up; a change beyond a simple correction waits for a person's approval. It reports the chain it followed, so the next person can see why the fix was in a service the ticket never mentioned.

How 2501 handles a service failing on a broken dependency: signal, trace the chain to the real failure, fix it within your rules, report the chain it followed

You stay in control

  • You choose the level: investigate only, act after a person confirms, or act on its own within your rules. The level is set per specialty, not per ticket.
  • Your rules apply: which services may be changed unattended. Changing how services depend on each other affects how the whole host starts, a bigger change than a restart, so it waits for a person's approval.
  • Some actions are never allowed: blacklisted commands and hosts stay out of reach, whatever a ticket asks for.

Frequently asked

Why does the error name a service that is fine? It is the one that failed visibly. What it needed was missing, and the service responsible for providing it is elsewhere in the chain.

Why was the service started if its dependency had failed? Some dependencies only set the order services start in, without requiring success, so the service starts anyway into an environment that is not ready.

Can it just show me the chain? Yes. In investigate-only mode it reports the chain and the failing service, and changes nothing.

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