Linked Questions
116 questions linked to/from What is the difference between CMD and ENTRYPOINT in a Dockerfile?
1
vote
1
answer
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Why both CMD and entrypoint defined in some images? [duplicate]
I have seen some images that based on the inspect have both CMD and ENTRYPOINT set.
What is the idea of this? What use cases are served when both are set?
- 4,529
3138
votes
17
answers
1.1m
views
What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?
What is the difference between the COPY and ADD commands in a Dockerfile, and when would I use one over the other?
COPY <src> <dest>
The COPY instruction will copy new files from <...
- 55.8k
48
votes
2
answers
64k
views
How can I start spring boot application in docker with profile?
I have a simple spring-boot project:
-resources
-application.yaml
-application-test.yaml
And I have this Dockerfile:
FROM openjdk:8-jdk-alpine
EXPOSE 8080
ADD micro-boot.jar micro-boot.jar
...
- 7,184
53
votes
3
answers
48k
views
Default Docker entrypoint
I am creating an image from another image that set a specific entrypoint. However I want my image to have default one. How do I reset the ENTRYPOINT?
I tried the following Dockerfile:
FROM some-...
- 1,224
67
votes
2
answers
32k
views
Differences Between Dockerfile Instructions in Shell and Exec Form
What is the difference between shell and exec form for
CMD:
CMD python my_script.py arg
vs.
CMD ["python", "my_script.py", "arg"]
ENTRYPOINT:
ENTRYPOINT ./bin/main
vs.
...
- 16.3k
33
votes
3
answers
30k
views
Execute a script before CMD
As per Docker documentation:
There can only be one CMD instruction in a Dockerfile. If you list more than one CMD then only the last CMD will take effect.
I wish to execute a simple bash script(which ...
- 2,610
39
votes
1
answer
85k
views
Starting container process caused "exec: \"/bin/sh\": stat /bin/sh: no such file or directory": unknown
I want to understand how CMD and ENTRYPOINT works. So, I just created a very simple Dockerfile
FROM scratch
CMD echo "Hello First"
ENTRYPOINT echo "Hello second"
Then I build image of this :
...
- 15.9k
24
votes
3
answers
29k
views
Is CMD or ENTRYPOINT necessary to mention in Dockerfile?
I have read the docs about CMD and ENTRYPOINT
https://docs.docker.com/engine/reference/builder/#entrypoint
Here, they have mentioned in the table that "NO CMD and NO ENTYRPOINT is not allowed&...
- 1,490
26
votes
3
answers
22k
views
Jenkins docker container always adds cat command
I am creating Jenkins pipeline for running terraform on a Docker container.
Here is my pipeline script.
pipeline {
agent {
docker {
image 'hashicorp/terraform:full'
...
- 373
23
votes
4
answers
18k
views
Does 'docker start' execute the CMD command?
Let's say a docker container has been run with docker run and then stopped with docker stop. Will the CMD command be executed after a docker start?
- 8,196
22
votes
3
answers
100k
views
entrypoint: "entrypoint.sh" - docker compose
There is no such file by name entrypoint.sh in my workspace.
But below instruction in docker-compose.yml is referring it:
builder:
build: ../../
dockerfile: docker/dev/Dockerfile
volumes:
...
- 17.3k
31
votes
2
answers
24k
views
Docker input/output outside the container
I created a docker container with a python script. The python script takes an input file, does some processing and saves output file at some specified location.
docker run /app/script.py --input /...
- 17.1k
11
votes
3
answers
44k
views
Passing parameters to Docker container
I create a container docker. Which should give the following:
docker run --rm container1
> Hello World!
docker run --rm container1 Bob
> Hello Bob!
My Dockerfile:
FROM ubuntu:14.04
ENTRYPOINT ...
- 183
16
votes
1
answer
34k
views
Why do some docker images require a command when run?
I find when using docker run I sometimes don't need to add a "command", while sometimes a "command" is a must. E.g. when running the ubuntu image a command isn't required:
# docker run ubuntu
#
...
- 17.7k
5
votes
2
answers
33k
views
running netcat inside docker container
I have created docker images using the below Dockerfile.
FROM ubuntu
RUN apt-get update \
&& DEBIAN_FRONTEND=noninteractive apt-get install -y \
net-tools \
&& apt-get clean \...
- 10.6k