The snippet library.
Small, practical examples. Search by task or narrow things down below.
Set copied files’ numeric ownership
Docker / Compose: COPY --chown sets ownership while adding the file.
Docker / Compose✓ Tested
Set no-new-privileges in Compose
Docker / Compose: security_opt configures the process privilege restriction.
Docker / Compose✓ Tested
Set service environment values
Pass configuration through the Compose environment section.
Compose✓ Tested
Set the open-file limit for a process
Docker / Compose: The nofile ulimit sets soft and hard file descriptor limits.
Docker / Compose✓ Tested
Share data through a named volume
Keep a file across two short-lived containers.
volume✓ Tested
Start an existing container and attach to its output
Docker / Compose: create records the command; start with attach runs that existing container.
Docker / Compose✓ Tested
Stop a running container gracefully
Docker / Compose: stop sends the configured stop signal and waits before forcing termination.
Docker / Compose✓ Tested
Supply a default for an unset Compose variable
Docker / Compose: The default interpolation form supplies a value when the variable is absent or empty.
Docker / Compose✓ Tested
Supply a non-secret configuration file
Docker / Compose: A Compose config mounts a declared file into the service.
Docker / Compose✓ Tested
Supply an environment variable to an exec process
Docker / Compose: An exec environment override applies to the new process only.
Docker / Compose✓ Tested
Use a build argument while creating an image
Docker / Compose: ARG supplies a build-time value that is not automatically a runtime environment variable.
Docker / Compose✓ Tested
Verify a read-only volume rejects writes
Docker / Compose: A failed write confirms the mount’s read-only behavior.
Docker / Compose✓ Tested