cat dockerfile.user

  FROM alpine
USER dockerworkshop:dockerworkshop
CMD ["sh"]

build dockerfile 

  docker build -t sangam14/user-dockerfile  -f dockerfile.user .
[+] Building 0.1s (5/5) FINISHED                                                                                                                           
 => [internal] load build definition from dockerfile.user                                                                                             0.0s
 => => transferring dockerfile: 105B                                                                                                                  0.0s
 => [internal] load .dockerignore                                                                                                                     0.0s
 => => transferring context: 2B                                                                                                                       0.0s
 => [internal] load metadata for docker.io/library/alpine:latest                                                                                      0.0s
 => CACHED [1/1] FROM docker.io/library/alpine                                                                                                        0.0s
 => exporting to image                                                                                                                                0.0s
 => => exporting layers                                                                                                                               0.0s
 => => writing image sha256:48482459d09aecafaa0db190d6995b6d2339c0383c6cd97fafbea288124332c7                                                          0.0s
 => => naming to docker.io/sangam14/user-dockerfile

run docker container in detach mode 

  docker container run -d sangam14/user-dockerfile 
5880a92a14d3944a4be00a19d55a19dd941f0c1b9a7a7b9159febcc29a09ea98

If we check the owner of the sleep process on the host, we can see it belongs to the user with uid 1000, the one that is created in the image

  ps aux | grep sleep
sangambiradar    22103   0.0  0.0 408111776   1168 s000  S+    2:03AM   0:00.00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn --exclude-dir=.idea --exclude-dir=.tox sleep
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Last updated 03 Jun 2024, 13:43 +0530 . history