Developer tools · Docker run to Docker compose converter
Entrypoint vs command: where trailing docker run arguments go in YAML
· How it works
docker compose container-command
Arguments after the image name are not part of the image name. This post explains how ENTRYPOINT and CMD combine, how --entrypoint and trailing arguments override them, and how both appear in Compose.
The container starts and immediately exits with usage text — the docker run had arguments after the image and the Compose file lost them
The container starts and immediately exits with usage text — the docker run had arguments after the image and the Compose file lost them. Evidence: arguments following the image are collected as command. Reproduce process invocation with disposable literals. Pair each source occurrence with entrypoint command image; reserve image metadata and signals for destination review.
The container command incident also reveals that A separate container command incident boundary is that --entrypoint writes one scalar and does not silently clear command. Evidence: --entrypoint writes one scalar and does not silently clear command. This process invocation constraint is a stopping point. Inspect entrypoint command image without manufacturing behavior, then document a host check for image metadata and signals.
ENTRYPOINT plus CMD — how an image's two instructions combine into one process command line
ENTRYPOINT plus CMD — how an image's two instructions combine into one process command line. Evidence: image ENTRYPOINT and CMD metadata are unavailable offline. Trace process invocation tokens into entrypoint command image. Separate ordered values from last-value fields; image metadata and signals is outside collection.
A related container command mechanism boundary is that A separate container command grammar boundary is that the serializer always chooses a YAML sequence for command arguments. Evidence: the serializer always chooses a YAML sequence for command arguments. Use this process invocation fact to predict one member or scalar in entrypoint command image. Check warnings before deciding anything about image metadata and signals.
Trailing arguments replace CMD — everything after the image name in docker run becomes command: in Compose
Trailing arguments replace CMD — everything after the image name in docker run becomes command: in Compose. Evidence: every post-image word is kept in command order. Judge process invocation serialization from its model. Quoting in entrypoint command image protects types but gives no operational proof for image metadata and signals.
The second container command serialization observation is A separate container command output boundary is that redis-server and its options remain distinct list elements. Evidence: redis-server and its options remain distinct list elements. This process invocation output separates settings from unavailable context. Keep entrypoint command image reviewable and check image metadata and signals independently.
--entrypoint replaces ENTRYPOINT — and often needs command: emptied or rewritten to make sense
--entrypoint replaces ENTRYPOINT — and often needs command: emptied or rewritten to make sense. Stop at the process invocation exception instead of guessing. Any addition near entrypoint command image needs a deployment-specific reason tied to image metadata and signals.
Another container command exception constraint is that A separate container command exception boundary is that Dockerfile shell forms and signals require image-level evidence. Evidence: Dockerfile shell forms and signals require image-level evidence. Keep the original process invocation command beside warnings. The comparison shows what entrypoint command image contains and which image metadata and signals decision remains manual.
The serializer always emits command arguments as a YAML sequence rather than choosing string form
List form versus string form — why command: ['sh','-c','...'] and command: sh -c '...' are parsed differently. Evidence: the serializer always chooses a YAML sequence for command arguments; The serializer always emits command arguments as a YAML sequence rather than choosing string form. Build the process invocation example from synthetic names. Make every entrypoint command image item traceable without exposing production image metadata and signals details.
The same container command example sample demonstrates that for this container command section keep the original for this container command section command and warnings for this container command section beside this candidate file. Evidence: the repository gives no broader runtime or historical proof. The paired process invocation fact should be visible in entrypoint command image. Record that line and avoid assumptions about image metadata and signals.
Worked example: docker run redis redis-server --appendonly yes — the resulting command list and how to verify it with docker compose config
Worked example: docker run redis redis-server --appendonly yes — the resulting command list and how to verify it with docker compose config. Translate the process invocation consequence into one observable entrypoint command image difference. Docker owns the later image metadata and signals verdict.
The container command consequence implementation also shows A separate container command effect boundary is that arguments following the image are collected as command. Split process invocation responsibilities: conversion writes entrypoint command image, the repository removes secrets, and operators validate image metadata and signals.
What this does not cover — shell form versus exec form in Dockerfiles and signal handling, which are image-level concerns
What this does not cover — shell form versus exec form in Dockerfiles and signal handling, which are image-level concerns. Limit process invocation scope to entrypoint command image branches shown here. Neighboring forms and defaults cannot answer image metadata and signals questions.
One more container command scope limit follows from A separate container command limit boundary is that image ENTRYPOINT and CMD metadata are unavailable offline. Treat this process invocation boundary as an exclusion. Prefer accurate entrypoint command image over guesses about image metadata and signals.
Takeaway: arguments belong under command — and the converter separates the image from what follows it
Takeaway: arguments belong under command — and the converter separates the image from what follows it. Evidence: the positional image boundary decides command ownership. Audit process invocation as source option, model field, entrypoint command image line and warning. Remove secrets before checking image metadata and signals.
Finally, the container command takeaway source confirms A separate container command decision boundary is that every post-image word is kept in command order. Close process invocation narrowly: entrypoint command image is a candidate; image metadata and signals and shell equivalence are not guarantees.