Complete the lab with a working images and dockerfiles example with an explicit success and failure check.
Guided practice · Images and Dockerfiles
Guided Lab: Images and Dockerfiles in Docker and Containers
Docker and Containers — Images and Dockerfiles lab: Write a Dockerfile for a small application, build it, inspect image history, and run it locally.
Outcome summary
Know what success looks like before you begin
Save verification evidence: the relevant output, test, log, query result, or rendered state for Images and Dockerfiles.
- I completed the module-specific practice task.
- I produced a working images and dockerfiles example with an explicit success and failure check.
- I saved the relevant output, test, log, query result, or rendered state for Images and Dockerfiles.
- I diagnosed and corrected one realistic Images and Dockerfiles failure.
Stop before using production credentials, important data, shared permissions, live infrastructure, or destructive commands that are not required by the lab.
Jump to a section
Lab brief
Know the problem and the evidence you need
Write a Dockerfile for a small application, build it, inspect image history, and run it locally.
a working images and dockerfiles example with an explicit success and failure check
Complete the task, verify the relevant output, test, log, query result, or rendered state for Images and Dockerfiles, then diagnose one failure that is specific to Images and Dockerfiles.
Build small, reproducible container images with explicit dependencies, a sensible base image, cache-aware layers, and a non-root runtime when practical.
Safety and setup
Prepare before changing anything
Have this ready
- Open a small local project or disposable lab environment.
- Confirm the runtime, toolchain, or service needed for the module.
- Prepare one valid input and one invalid or boundary input.
Field checks
0 of 5 checks completeRun the lab
Complete one check at a time. Record the evidence before moving on.
Interpret results
Match the evidence to the next action
If you seeNext action
The expected result appears and the boundary case behaves correctly
Save the result and continue to the module checkpoint.
The normal case works but the failure or boundary case does not
Return to the diagnostic step and inspect the module-specific state or output before changing more code.
The result changes between runs
Compare the relevant input, dependency, configuration, data, state, or runtime version for this module.
Choose the next action
Complete the lab when you can reproduce the working result, explain the important module decision, and recover from the tested failure.
Confirm the evidence you produced
Finished record: a working images and dockerfiles example with an explicit success and failure check
- I completed the module-specific practice task.
- I produced a working images and dockerfiles example with an explicit success and failure check.
- I saved the relevant output, test, log, query result, or rendered state for Images and Dockerfiles.
- I diagnosed and corrected one realistic Images and Dockerfiles failure.