Docker unable to prepare context unable to evaluate symlinks in Dockerfile path GetFileAttributesEx

Question

I just downloaded Docker Toolbox for Windows 10 64bit today   I m going through the tutorial   I m receving the following error when trying to build an image using a Dockerfile   Steps    Launched Docker Quickstart terminal  testdocker after creating it  Prepare Dockerfile as documented in  Build your own image  web link ran below command   docker build -t docker-whale    Error    docker build -t docker-whale    unable to prepare context  unable to evaluate symlinks in Dockerfile path  GetFileAttributesEx C  Users Villanueva Test testdocker Dockerfile  The system cannot find the file specified   BTW  I tried several options mentioned   https   github com docker docker issues 14339        docker info     Containers  4      Running  0      Paused  0      Stopped  4     Images  2     Server Version  1 10 1     Storage Driver  aufs      Root Dir   mnt sda1 var lib docker aufs      Backing Filesystem  extfs      Dirs  20      Dirperm1 Supported  true     Execution Driver  native-0 2     Logging Driver  json-file     Plugins       Volume  local      Network  bridge null host     Kernel Version  4 1 17-boot2docker     Operating System  Boot2Docker 1 10 1  TCL 6 4 1   master   b03e158 - Thu Feb 11 22 34 01 UTC 2016     OSType  linux     Architecture  x86 64     CPUs  1     Total Memory  996 2 MiB     Name  default     ID  C7DS CIAJ FTSN PCGD ZW25 MQNG H3HK KRJL G6FC VPRW SEWW KP7B     Debug mode  server   true      File Descriptors  32      Goroutines  44      System Time  2016-02-19T17 37 37 706076803Z      EventsListeners  0      Init SHA1       Init Path   usr local bin docker      Docker Root Dir   mnt sda1 var lib docker     Labels       provider virtualbox

User · Answer

please check whether docker is running on your windows or not  I try to find the solution and then accidently checked and find the issue

User · Answer

The problem is that the file name should be Dockerfile and not DockerFile or dockerfile it should be D capital followed by ockerfile in lower-case pls note

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On Mac it works for below command   hope your  Dockerfile is in your root directory    docker build -t docker-whale -f  Dockerfile

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I had originally created my Dockerfile in PowerShell and though I didn t see an extension on the file it showed as a PS File Type   once I created the file from Notepad   being sure to select the  All types      File Type with no extension on the File Name  Dockerfile   That allowed my image build command to complete successfully    Just make sure your Dockerfile has a Type of  File

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I had created my DockerFile by VS2017 Docker Support tool and had the same error  After a while I realised I was not in the correct directory that contains the Dockerfile    source repos DockerWebApplication    cd ed to the correct file    source repos DockerWebApplication DockerWebApplication  which was inside the project and successfully created the docker image

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In windows 10  period is first parameter docker build   -t docker-whale

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I erroneously created Dockerfile txt in my working directory leading to the above-mentioned error while build  The fix was to remove the  txt extension from the file   The file name should be Dockerfile only without any extension

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In WSL  there seems to be a problem with path conversion   The location of the Dockerfile in Ubuntu  where I m running docker and where Dockerfile lives  is   home sxw455 App1   but neither of these commands worked     pwd  home sxw455 App1   ll total 4 drwxrwxrwx 0 sxw455 sxw455 4096 Dec 11 19 28    drwxr-xr-x 0 sxw455 sxw455 4096 Dec 11 19 25     -rwxrwxrwx 1 sxw455 sxw455  531 Dec 11 19 26 Dockerfile  -rwxrwxrwx 1 sxw455 sxw455  666 Dec 11 19 28 app py  -rwxrwxrwx 1 sxw455 sxw455   12 Dec 11 19 27 requirements txt     docker build -t friendlyhello   unable to prepare context  unable to evaluate symlinks in Dockerfile path  GetFileAttributesEx C  Windows System32 Dockerfile  The system cannot find the file specified     docker build -t friendlyhello   home sxw455 App1  unable to prepare context  path   home sxw455 App1  not found   But in Windows  the actual path is   C  Users sxw455 AppData Local Packages CanonicalGroupLimited Ubuntu18 04onWindows 79rhkp1fndgsc LocalState rootfs home sxw455 App1   And so I had to do this  even though I ran it from bash      docker build -t friendlyhello   C  Users sxw455 AppData Local Packages CanonicalGroupLimited Ubuntu18 04onWindows 79rhkp1fndgsc LocalState rootfs home sxw455 App1   Sending build context to Docker daemon   5 12kB Step 1 7   FROM python 2 7-slim  --- gt  0dc3d8d47241 Step 2 7   WORKDIR  app  --- gt  Using cache  --- gt  f739aa02ce04 Step 3 7   COPY    app  --- gt  Using cache  --- gt  88686c524ae9 Step 4 7   RUN pip install --trusted-host pypi python org -r requirements txt  --- gt  Using cache  --- gt  b95f02b14f78 Step 5 7   EXPOSE 80  --- gt  Using cache  --- gt  0924dbc3f695 Step 6 7   ENV NAME World  --- gt  Using cache  --- gt  85c145785b87 Step 7 7   CMD   python    app py    --- gt  Using cache  --- gt  c2e43b7f0d4a Successfully built c2e43b7f0d4a Successfully tagged friendlyhello latest SECURITY WARNING  You are building a Docker image from Windows against a non-Windows Docker host  All files and directories added to build context will have  -rwxr-xr-x  permissions  It is recommended to double check and reset permissions for sensitive files and directories    I had similar problems with environment variables during the initial installation  and followed some advice that said to install the Windows DockerCE and hack the environment variables rather than installing the Ubuntu DockerCE  because  I hope I remembered this correctly  that WSL does not fully implement systemctl   Once the Windows Docker CE installation is done and environment variables are set  docker then works fine under WSL Ubuntu

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The name of the file should be Dockerfile and not  Dockerfile  The file should not have any extension

User · Answer

The error message is misleading  The problem has nothing to do with symlinks really  It is usually only that docker cannot find the Dockerfile describing the build  Typical reasons are these   Dockerfile has wrong name  It must be called Dockerfile  If it is called  for instance  dockerfile   Dockerfile  Dockerfile txt  or other  it will not be found  Dockerfile is not in context  If you say docker build contextdir  the Dockerfile must be at contextdir Dockerfile  If you have it in  say    Dockerfile instead  it will not be found  Dockerfile does not exist at all  Sounds silly  Well  I got the above error message from my GitLab CI after I had written a nice Dockerfile  but forgotten to check it in  Silly  Sure  Unlikely  No

User · Answer

To build an image from command-line in windows linux   1  Create a docker file in your current directory     eg  FROM ubuntu        RUN apt-get update        RUN apt-get -y install apache2        ADD    var www html        ENTRYPOINT apachectl -D FOREGROUND        ENV name Devops Docker 2  Don t save it with  txt extension  3  Under command-line run the command    docker build   -t apache2image

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In case if we have multiple docker files in our environment just Dockerfile wont suffice our requirement  docker build -t ihub -f Dockerfile ihub    So use the file  -f argument  command to specify your docker file Dockerfile ihub

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I my case  run from Windows 10  1  Rename the file myDockerFile Dockerfile to Dockerfile  without file extension   Then run from outside the folder this command     docker build   Docker-LocalNifi     This is working for me and for my colleagues at work  hope that will also work for you

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That s just because Notepad add   txt  at the end of Dockerfile

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If you have mounted a second drive to an NTFS folder as a  mounted volume  then you can get this issue  Move you files to a drive location outside of the mounted volume

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I got this on Windows when the path I was working in was under a Junction directory  So my fix was to not work under that path

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Make sure you run the command docker build   -t docker-whale   from the directory that has the dockerfile

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Just Remove the extension  txt from Dockerfile and run the command   docker build -t image-name    It will work for sure

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I also faced the same issues and it was resolved when i created file named with DockerFile and mentioned all the command which wanted to get executed while creation of any image

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Most importantly make sure your file name is Dockerfile if you use another name it won t work at least it did not for me    Also if you are in the same dir where the Dockerfile is use a   i e    docker build -t Myubuntu1 v1   or use the absolute path i e  docker build -t Myubuntu1 v1  Users  lt username gt  Desktop Docker

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I tried this and it worked     docker build -t test dotnet image   C  Users ssundarababu Documents Docker Learn SimpleDockerfile    Please see quotes un-quotes around the foldername   Note  In Folder  C  Users ssundarababu Documents Docker Learn SimpleDockerfile  I have my Dockerfile

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The error means that docker build is either using a PATH   URL that are incorrectly input or that the Dockerfile cannot be found in the current directory  Also  make sure that when running the command from an integrated terminal  e g  bash inside your IDE or text editor  you have the admin permissions to do so  Best if you can check the PATH from your terminal with pwd  in bash shell or dir if using a simple cli on windows  and copy the exact path where you want the image to be build  docker build C  windows your amazing directory docker build --help will also show you available options to use in case of malformed or illegal commands

User · Answer

while executing following command   docker build -t docker-whale     check that Dockerfile is present in your current working directory

User · Answer

Below command worked for me  docker build -t docker-whale -f Dockerfile txt

User · Answer

Be sure your DOCKERfile is in the ROOT of the application directory  I had mine in src which resulted in this error because Docker was not finding the path to DOCKERfile

User · Answer

Two ways to build a dockerfile   You can decide not to specify the file name  of which to build from and just build it specifying a path  doing it this way the file name must be Dockerfile with no extension appended  eg  docker build -t docker-whale tag path to Dockerfile  or  You can specify a file with -f and it doesn t matter what extension  within reason  txt   dockerfile   Dockerfile etc    you decide to use  eg docker build -t docker-whale tag  path to file -f docker-whale dockerfile

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Make sure file name  Dockerfile  is not saved with any extension   Just create a file without any extension   And make sure Dockerfile is in same directory from where you are trying to building docker image

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In Linux  folders are case sensitive  I was getting this error because folder name TestAPI and was putting TestApi

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Execute docker build -t getting-started   in your project directory and make sure Dockerfile is present and having no  txt extension   If you are on Windows  check the  file name extension  in the under the view tab in the  File Explorer to show whether  txt is there or not and remove it if the former is true  Good Luck

User · Answer

To build Dockerfile save automated content in Dockerfile  not Dockerfile because while opening a file command     notepad Dockerfile     A text file is written so file cannot build   To build file run     notepad Dockerfile   and Now run     docker build -t docker-whale     Make sure you are in current directory of Dockerfile

User · Answer

The issue is related to the DockerFile creation procedure    In order to work  open cmd  cd to the directory of interest and type    abc gt DockerFile   This will create a file called DockerFile inside your folder   Now type    notepad DockerFile    This will open the DockerFile file in notepad and you will have to copy paste the standard code provided    Save the file and now  finally  build your image with Docker typing    docker build -t docker-whale      This is working for me and I hope it helps others

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I have got this error  in MacBook  though I used correct command to create image   docker build -t testimg     Later I found that path is the problem  Just navigate to the correct path that contains docker file  Just double check your current working directory  Nothing to panic

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I had named my file dockerfile instead of Dockerfile  capitalized   and once I changed that  it started processing my  Dockerfile

User · Answer

If you are working on windows 8 you would be using Docker toolbox  From the mydockerbuild directory run the below command as your Dockerfile is a textfile  docker build -t docker-whale -f   Dockerfile txt

[docker] Docker: unable to prepare context: unable to evaluate symlinks in Dockerfile path: GetFileAttributesEx

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