EX200 Manage containers Practice Question
Which THREE statements about container storage in podman are correct? (Choose THREE.)
⚠ Common exam trap
Red Hat often tests the misconception that rootless containers cannot use overlay filesystems, but in modern Linux kernels (5.11+) with `userxattr` or via `fuse-overlayfs`, rootless overlay is fully supported.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The --storage-opt flag can be used to set options for the container's writable layer.
The `--storage-opt` flag in Podman allows you to pass options directly to the container's storage driver, such as setting the size of the container's writable layer (e.g., `--storage-opt size=10G`). This is a feature of the container storage stack (containers/storage) that Podman uses, enabling fine-grained control over the writable layer's behavior without affecting the image layers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Podman volumes can only be managed by podman volume commands, not manually.
Why it's wrong here
Although podman volume commands are the standard interface, Podman volumes are not exclusively managed by them. A volume is ultimately a directory on the host, so you can create that directory manually with mkdir and mount it into a container using the --volume or --mount option. Podman volume create mainly adds metadata and lifecycle management, but manual directories work as long as they have the correct permissions and SELinux context.
- ✓
The --storage-opt flag can be used to set options for the container's writable layer.
Why this is correct
The --storage-opt flag is a valid Podman run option that passes storage driver options to the container's writable layer. For example, size= can set a maximum size for the writable layer when using drivers that support quotas. This differs from --volume options because it configures the local mutable container layer itself rather than external storage.
- ✗
Rootless containers cannot use the overlay filesystem driver.
Why it's wrong here
The claim that rootless containers cannot use overlay is incorrect. Rootless users can use the overlay filesystem driver when fuse-overlayfs is installed, which provides a FUSE implementation of overlayfs without requiring root privileges. Newer kernels also allow unprivileged overlay mounts in some configurations, but fuse-overlayfs is the common solution in Podman's rootless mode.
- ✓
Bind mounts mount a host directory into the container.
Why this is correct
A bind mount takes an existing directory or file on the host and attaches it at a specified path inside the container, using an absolute host path. These mounts are not managed by Podman and are not snapshotted or isolated; writes performed in the container go directly to the host location. This makes bind mounts ideal for sharing configuration files or development trees.
- ✓
Container images are stored in layers, each representing a set of filesystem changes.
Why this is correct
Container images are assembled from read-only layers, where each layer records a set of filesystem changes such as added, modified, or deleted files. These layers are stacked to form the container's root filesystem and are shared among containers that use the same base image, which saves disk space and speeds up distribution. The container runtime adds a thin writable layer on top for runtime mutations, applying copy-on-write so base layers remain unchanged.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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