I'm trying to configure running simple .NET Core Web API application inside Docker container. My dockerfile contains following ENTRYPOINT line:
ENTRYPOINT ["dotnet", "Project.name.dll"]
Dockerfile builds image proper. When I run it however I have following exception:
No executable found matching command "dotnet-Project.name.dll"
I don't understand why parameter is transformed in that way (added hyphen). I use microsoft/dotnet:2.0.0-sdk-stretch container. Official documentation recommends following ENTRYPOINT config
ENTRYPOINT ["dotnet", "dotnetapp.dll"]
Which is the same as I use...
It's a bizarre error message, but it really is saying that the dll can not be found. You can see other examples of this "issue" here: https://github.com/dotnet/core-setup/issues/1126#issuecomment-327441394
When you run dotnet foo.dll, the dotnet application tries to find foo.dll and execute it. If the dll is not found, dotnet thinks that maybe you are trying to run a dotnet command (along the lines of dotnet foo, similar to dotnet build). This makes dotnet look for an executible named dotnet-foo.dll and try and execute that. Since that file also doesn't exist, dotnet finally errors out that dotnet-foo.dll can not be found.
In your case, it looks like dotnet couldn't find Project.name.dll. Does the dll really exist? Does it exist in the current directory? Perhaps you need to provide the full path to it?
Oh, and if you are running this on Azure, there are some known gotchas, such as putting your dlls under /home/ will just not work.
Related
I'm currently trying to integrate my perfectly working toDoList.jar file into a docker container(OpenJDK14 on linux alpine). I'm able to build the image which also copys JavaFX into the image, but when I try to run the container I get the following error:
Error
C:\Users\jkcar\IdeaProjects\toDoList>docker run todolist
Error occurred during initialization of boot layer
java.lang.module.FindException: Module javafx.controls not found
Dockerfile
FROM openjdk:14-alpine
COPY library/javafx-sdk-14.0.2.1 /JavaFX
COPY out/artifacts/toDoList_jar/toDoList.jar /JavaAPP/toDoList.jar
ENTRYPOINT ["java" , "--module-path" , "/JavaFX/javafx-sdk-14.0.2.1/lib" , "--add-modules" , "javafx.controls,javafx.fxml" , "-jar" , "/JavaAPP/toDoList.jar"]
I figure that the error has something to do with my ENTRYPOINT command but I am having trouble determining what the error in my command is. Does anyone have any recommendations/advice/tips that might get this to work?
I ended up solving the following by re-routing how I copied my JavaFX SDK and toDoList.jar. Here is the adjusted section of the Dockerfile.
COPY library/javafx-sdk-14.0.2.1 javafx-sdk-14.0.2.1
COPY out/artifacts/toDoList_jar/toDoList.jar toDoList.jar
ENTRYPOINT java --module-path /javafx-sdk-14.0.2.1/lib --add-modules javafx.controls,javafx.fxml -jar toDoList.jar -Dprism.verbose=true
I've tried editing the dockerfile, i get a successful build and running the container but the container doesn't reflect when i do "docker ps". i get this error when i check the container logs "Could not execute because the specified command or file was not found.
Possible reasons for this include:
You misspelled a built-in dotnet command.
You intended to execute a .NET Core program, but dotnet-QuintAPI.dll does not exist.
You intended to run a global tool, but a dotnet-prefixed executable with this name could not be found on the PATH.
"
Figured it out, the executable file specified in the docker file was wrongly spelled. Once that was corrected, everything worked perfect.
I'm trying to move my few microservices to a docker containers using docker-compose project type from Visual Studio.
I also have Service Fabric project so I have to install Service Fabric SDK into my docker containers.
That's what I do to achieve this (my dockerfile(s)):
FROM mcr.microsoft.com/dotnet/core/aspnet:2.2-nanoserver-1809 AS base
WORKDIR /app
EXPOSE 80
...
WORKDIR /temp
ADD https://aka.ms/vs/15/release/vs_buildtools.exe /temp #C:\TEMP\vs_buildtools.exe
...
The rest code doesn't matter since it crashes on line with ADD command.
The error from Output after I run this via Ctrl+F5:
3>Step 4/11 : ADD https://aka.ms/vs/15/release/vs_buildtools.exe /temp
3>Service 'bmt.microservices.snowforecastcenter' failed to build: ADD failed: CreateFile \\?\C:\ProgramData\Docker\tmp\docker-builder567273413\temp: The system cannot find the file specified.
I don't understand what I'm doing wrong and what does it mean 'system cannot find the file' since I simply load the file from the internet and place it into my newly created \temp folder (the link is valid, I checked).
Does anybody know what this might be related to?
Ok, I've accidentally fixed the problem by moving comment to next line.
From this:
ADD https://aka.ms/vs/15/release/vs_buildtools.exe /temp #C:\TEMP\vs_buildtools.exe
To this:
ADD https://aka.ms/vs/15/release/vs_buildtools.exe /temp
#C:\TEMP\vs_buildtools.exe
Then I red on official site (https://docs.docker.com/engine/reference/builder/#/from) that you cannot have inline comments since they are treated as arguments:
Docker treats lines that begin with # as a comment, unless the line is a valid parser directive. A # marker anywhere else in a line is treated as an argument.
I hope this will help other people who are new in Docker.
FROM "this line works but cant show code"
RUN yum install -y java-1.8.0-openjdk.x86_64 && yum clean all
COPY /resources/accounts.txt /home/resources/accounts.txt
COPY elk_casino_server /home/elk_casino_server
CMD ["jar","cvmf","/home/elk_casino_server/src/META-INF/MANIFEST.MF","/home/server.jar","/home/elk_casino_server/src/Main.class"]
CMD ["java","-jar","/home/server.jar"]
Please take a little more time to format your code snippets correctly and to make sure you ask a clear question.
Your Dockerfile uses the COPY instruction to copy two resources into your container image:
/resources/accounts.txt (available within the image at /home/resources/accounts.txt)
/elk_casino_server (available within the image at /home/elk_casino_server)
Unfortunately, your CMD instructions are trying to execute something very different. Only one command instruction can be defined and the latter will be accepted, which is:
CMD ["java","-jar","/home/server.jar"]
At no point do you copy /home/server.jar into your container image.
The parameter order of the char command seems to be wrong. The manifest-addition should come after the jar-file, not before it.
jar cfm jar-file manifest-addition input-file(s)
see: Packaging Programs in JAR Files: Modifying a Manifest File
Also: If there are more than one CMD, the last one overrides the others. Since I think you want to pack the jar at build time, RUN might be a better choice.
Both points combined:
RUN jar cvmf /home/server.jar /home/elk_casino_server/src/META-INF/MANIFEST.MF /home/elk_casino_server/src/Main.class
Hopefully someone can help me see the wood for the trees as they say!
I am no Linux expert and therefore I am probably missing something very obvious.
I have a dockerfile which contains the following:
FROM node:9.8.0-alpine as node-webapi
EXPOSE 3000
LABEL authors="David Sheardown"
COPY ["package.json", "npm-shrinkwrap.json*", "./"]
RUN npm install --production --silent && mv node_modules ../
COPY . /home/vsts/work/1/s/
CMD ["node", "index.js"]
I then have an Azure pipeline setup as the following image shows:
My issue seems to be the build process cannot find the dockerfile itself:
##[error]Unhandled: No Dockerfile matching /home/vsts/work/1/s/**/Dockerfile was found.
Again, apologies in advance for my lack of Linux knowledge.. there is something silly I have done or not done ;)
P.S: I forgot to mention in Azure Pipelines I am using "Hosted Linux Preview"
-- UPDATE --
This is the get sources stage:
I would recommend adding the exact path to where the docker file resides on your repository .
Dockerfile: subpath/Dockerfile`
You're misusing this absolute path, both within the dockerfile and in the docker build task:
/home/vsts/work/1/s/
That is a path that exists on the build agent (not within the dockerfile) - but it may or may not exist on any given pipeline run. If the agent happens to use work directory 2, or 3, or any other number, then your path will be invalid. If you want to run this pipeline on a different type of agent, then your path will be invalid.
If you want to use a dockerfile in your checked out code, then you should do so by using a relative path (based on the root of your code repository), for example:
buildinfo/docker/Dockerfile
Note: that was just an example, to show the kind of path you should use; here you should be using the actual relative path in your actual code repo.