COPY with docker but with exclusion

Question

In a Dockerfile  I have  COPY       I want to exclude an entire directory  in my case  node modules directory   Something like this      COPY  all but    node modules         Is this possible with Docker

User · Answer

In my case  my Dockerfile contained an installation step  which produced the vendor directory  the PHP equivalent of node modules   I then COPY this directory over to the final application image  Therefore  I could not put vendor in my  dockerignore  My solution was simply to delete the directory before performing composer install  the PHP equivalent of npm install    FROM composer AS composer WORKDIR  app COPY     RUN rm -rf vendor        amp  amp  composer install   FROM richarvey nginx-php-fpm WORKDIR  var www html COPY --from composer  app     This solution works and does not bloat the final image  but it is not ideal  because the vendor directory on the host is copied into the Docker context during the build process  which adds time

User · Answer

FOR A ONE LINER SOLUTION  type the following in Command prompt or Terminal at project root  echo node modules  gt   dockerignore This creates the extension-less   prefixed file without any issue  Replace node modules with the folder you want to exclude

User · Answer

Excluding node modules from current directory   node modules   Excluding node modules in any immediate subdirectories    node modules   Here is the official docs

User · Answer

Adding  dockerignore works for me  One additional point Those who are trying this solution on Windows   windows will not let you create  dockerignore file  as it doesn t by default allows creating file starting with     To create such file starting with   on Windows   include an ending dot also  like    dockerignore  and hit enter   provided you have enabled view extension options from folder options

User · Answer

Create file  dockerignore in your docker build context directory  so in this case  most likely a directory that is a parent to node modules  with one line in it       node modules   although you probably just want   node modules   Info about dockerignore  https   docs docker com engine reference builder  dockerignore-file

User · Answer

For those who can t use a  dockerignore file  e g  if you need the file in one COPY but not another    Yes  but you need multiple COPY instructions  Specifically  you need a COPY for each letter in the filename you wish to exclude   COPY   n        All files that don t start with  n  COPY n  o       All files that start with  n   but not  no  COPY no  d      All files that start with  no   but not  nod    Continuing until you have the full file name  or just the prefix you re reasonably sure won t have any other files

User · Answer

For those using gcloud build  gcloud build ignores  dockerignore and looks instead for  gcloudignore Use  cp  dockerignore  gcloudignore Source

[docker] COPY with docker but with exclusion

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