Pricing
00
In productionbeginnerProcess lifecycle

The node appears missing

Determine why `/scan_filter` is absent without reinstalling or rebuilding the workspace.

Pairs with Evidence before editing in ROS 2 Systems Debugging. Read the concept first, then diagnose it here.

Open repair workspace

Operator report

The launch command returns successfully, but `/scan_filter` is absent from `ros2 node list`.

Ubuntu 24.04, ROS 2 Jazzy, Python and C++ nodes, browser telemetry workspace

01

System boundary

Trace only the relevant path.

3 nodes
  1. 01launch service→
  2. 02scan_filter process→
  3. 03ROS node graphOUT
02

How this lab works

You diagnose it. No command list.

Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you - finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.

03

Verification

Pass more than the visible symptom.

4 checks
  • Process remains active
  • Required node is discovered
  • Hidden regression behavior
  • Root cause explanation