I need to run the following on ENTRYPOINT[..]:
dotnet reportgenerator -reports:coverage.cobertura.xml -targetdir:Reports -reportTypes:htmlInline
How do I do this?
Try execform of ENTRYPOINT:
ENTRYPOINT ["dotnet","reportgenerator","-reports:coverage.cobertura.xml","-targetdir:Reports","-reportTypes:htmlInline"]
Apart from execform there is the shell form, which looks like this:
ENTRYPOINT command param1 param2
In the ENTRYPOINT array, you should include stable default(they are not considered changeable) commands with their arguments. Then if you wish to set additional defaults that are more likely to be changed use CMD.
Example taken from the official's documentation link:
FROM ubuntu
ENTRYPOINT ["top", "-b"]
CMD ["-c"]
Did you try?
ENTRYPOINT ["dotnet", "reportgenerator", "-reports:coverage.cobertura.xml", "-targetdir:Reports", "-reportTypes:htmlInline"]
Related
Currently if I run a container I must speicfy a new CMD in order to pass args.
I.e. the format is docker run image [CMD] [ARGS]
Is there any way to pass args to the CMD at the end of the Dockerfile without specifying a new CMD when running the container.
The reason this probably works for you is that usually, the default ENTRYPOINT is /bin/bash -c, and then when you add CMD with executable it adds to the ENTRYPOINT to run the CMD contents as you'd expect.
CMD ["executable","param1","param2"] (exec form, this is the preferred form)
CMD ["param1","param2"] (as default parameters to ENTRYPOINT)
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.
Dockerfile docs
This means your main option is to replace the old CMD with an ENTRYPOINT in the new Dockerfile and append the runtime arguments with a new CMD directive, either with permanent default values, ones received from environment variables, or a combination of the two
Hopes this helps
You can write your CMD statement like this at end of the Dockerfile.
CMD ["executable","param1","param2"]
source: https://docs.docker.com/engine/reference/builder/
I am defining an image in a Dockerfile which has another image as its parent:
FROM parent_org/parent:1.0.0
...
The parent image's documentation mentions an argument (special-arg) that can be passed when running an instance of the container:
docker run parent_org/parent:1.0.0 --special-arg
How can I enable special-arg in my Dockerfile?
TL;DR: you could use the CMD directive by doing something like this:
FROM parent_org/parent:1.0.0
CMD ["--special-arg"]
however note that passing extra flags to docker run as below would overwrite --special-arg (as CMD is intended to specify default arguments):
docker build -t child_org/child .
docker run child_org/child # would imply --special-arg
docker run child_org/child --other-arg # "--other-arg" replaces "--special-arg"
If this is not what you'd like to obtain, you should redefine the ENTRYPOINT as suggested below.
The CMD and ENTRYPOINT directives
To have more insight on CMD as well as on ENTRYPOINT, you can take a look at the table involved in this other SO answer: CMD doesn't run after ENTRYPOINT in Dockerfile.
In your case, you could redefine the ENTRYPOINT in your child image (and if need be, the default CMD) by adapting child_org/child/Dockerfile w.r.t. what was defined in the parent Dockerfile.
Assuming the parent_org/parent/Dockerfile looks like this:
FROM debian:stable # for example
WORKDIR /usr/src/foo
COPY entrypoint.sh .
RUN chmod a+x entrypoint.sh
ENTRYPOINT ["./entrypoint.sh"]
CMD ["--default-arg"]
You could write a child_org/child/Dockerfile like this:
FROM parent_org/parent:1.0.0
RUN […]
# Redefine the ENTRYPOINT so the --special-arg flag is always passed
ENTRYPOINT ["./entrypoint.sh", "--special-arg"]
# If need be, redefine the list of default arguments,
# as setting ENTRYPOINT resets CMD to an empty value:
CMD ["--default-arg"]
This baffled me at first, too... Run them using the command: declaration... A command and an Entrypoint are two different things... The entrypoint runs whatever script/execution call your service needs to initialize and start. That entrypoint script then usually runs logic to append whatever you pass in from the command: declaration as further arguments to alter the behavior of the service.
I am using base image ibmcom/mq which uses ENTRYPOINT to execute its process:
ENTRYPOINT ["mq.sh"]
If in my Dockerfile I use CMD the parent image works fine, but my CMD doesn't seem to be executed. If in my Dockerfile I use ENTRYPOINT my command is running but then the parent ENTRYPOINT doesn't seem to be running.
What am i missing here?
OK. I now understand that if I use CMD it acts as a parameter to the ENTRYPOINT and if I use ENTRYPOINT it overrides it. I thought this is so only within the same Dockerfile.
Trying to access the command line args from a dotnet core console application in docker.
This is basically just the default template with default docker compose / dockerfile template.
Tried a few different approaches.
Add args to ENTRYPOINT in dockerfile
Added args to CMD in dockerfile
Added args under build in the docker-compose file
Cant get it to pass it on, how is this usually handled?
Test repo: https://github.com/lasrol/DotnetCoreDockerArgs
CMD is meant as an alternative to ENTRYPOINT, or a way to supply arguments to an entrypoint.
Rather than doing:
ENTRYPOINT ["dotnet", "TestDocker.dll", $arg1, $arg2]
CMD ["arg1", "arg2"]
Which will repeat the arguments,
Try:
ENTRYPOINT ["dotnet", "TestDocker.dll", "arg1", "arg2"]
or if you want to use both, simply use CMD for all the arguments only.
ENTRYPOINT ["dotnet", "TestDocker.dll"]
CMD ["arg1", "arg2"]
https://docs.docker.com/engine/reference/builder/#cmd
I've got the following in my Dockerfile:
ENTRYPOINT echo "wtf"
CMD ["wtf wtf"]
When I start it up I get:
nginx_1 | wtf
I would expect the output to be wtf wtf wtf instead of wtf.
Modifying the Dockerfile to:
ENTRYPOINT echo "$#"
CMD ["wtf wtf"]
Results in empty out
Why aren't the additional commands passed to echo?
You should use the array representation in the entrypoint as well as stated in the documentation it is the preferred way of specifying ENTRYPOINT:
ENTRYPOINT ["executable", "param1", "param2"] (exec form, preferred)
If it's not in array form docker won't understand which part is the command and what are the arguments.