Hands-on Lab·Red Hat Certified System Administrator
One-Time Jobs with at
The second of the three tools the scheduling objective names, and the only one for "once, then never again". It is also the one most likely to be absent - `at` is not installed by default on RHEL 10, and its service is not enabled.
Deploy and Maintain Guide 44 of 67 Beginner
- OSRHEL 10.0 (Coughlan)
- Kernel6.12.0-55.9.1.el10_0
- dnf4.20.0
- Flatpak1.16.0
- TimeAbout 9 min
- Reviewed23 August 2026
Written against the versions above. `at` is **not installed** on a default RHEL 10 and `atd` is not enabled. If a task asks for a one-off job, installing the package and enabling the service is part of the answer - and forgetting `enable --now atd` produces a job that queues and never runs.
| Server Name | IP Address | OS | Roles | CPU | RAM | HDD |
|---|---|---|---|---|---|---|
| RHCSA-A01 | 192.168.0.31 | RHEL 10.0 (Coughlan) | Practice node (graded) - spare /dev/sda | 2 Core | 4 GB | 50 GB + 15 GB |
Before you start
- A sudo-capable account and a working repository.
- The session installs
at, queues a job and removes it.
-
It is not there yet
-
Queuing, inspecting and removing