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(https://stackoverflow.co/labs/)   Learn more about Labs   (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (/questions/61125441/get-id-of-user-on-host-from-a-docker) Get id of user on host, from a docker  (/questions/ask) Ask Question     (2020-04-09 16:08:13Z) Asked 4 years, 4 months ago  Modified (?lastactivity) (2020-04-17 08:22:45Z) 4 years, 4 months ago  (Viewed 1,621 times) Viewed 2k times         This question shows research effort; it is useful and clear  (70:3:31e,16:93a533c6b0dd1297,10:1725236606,16:38fd4d710c8145d9,8:61125441,16ec0a6a41387294a44044a06f1bed7719a28943d5202e0e5485de2401c7065f) -1  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:43d19289727e1238,10:1725236606,16:decd2c4387788f63,8:61125441,82e53079f6edff80161530e4b6fff2c7beea26ab9e8d1282239ed7ac322b7cf2)      Save this question.  (/posts/61125441/timeline)    Show activity on this post.    From inside a container, I would like to get the id of a user on the host machine (what the command id -u username would output, from the host). Is there a way to accomplish this? I thought I could mount /etc/passwd in the container and grep inside, but unfortunately the users are not listed in this file on our server (possibly related to the LDAP authentication mechanism?). Thanks  (/questions/tagged/docker) (show questions tagged 'docker') docker  (/questions/tagged/host) (show questions tagged 'host') host  (/questions/tagged/uid) (show questions tagged 'uid') uid      (/q/61125441) (Short permalink to this question) Share  Share a link to this question     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/61125441/edit) () Improve this question  Follow (70:3:31e,16:cad4e169ca767458,10:1725236606,16:9180994423c4d50e,8:61125441,81c8a33f8b15a73a5e89da68596f36c6ef42e16ca485e409ea76731d283aa01d)  Follow this question to receive notifications       asked (2020-04-09 16:08:13Z) Apr 9, 2020 at 16:08   (/users/2015376/bruno) (bruno's user avatar)    (/users/2015376/bruno) bruno bruno (reputation score) 69 (5 bronze badges)  5  5 bronze badges        2   obviously not possible, what are you trying to achieve? you could mount /etc/passwd as a volume file, with the risks which come with it  – (/users/661872/lawrence-cherone) (46,431 reputation) Lawrence Cherone  Commented (2020-04-09 16:15:24Z, License: CC BY-SA 4.0) Apr 9, 2020 at 16:15   (this comment was edited 2 times)          Here is the use case: I have a (containerized) Jupyter Hub server that spawns (containerized) single-user Jupyterlab notebook servers. The home folder of the user that logs in Jupyter Hub is mounted into the notebook server's container, so the latter should ideally run with the user's id to have full permissions on the folder. – (/users/2015376/bruno) (69 reputation) bruno  Commented (2020-04-09 18:38:00Z, License: CC BY-SA 4.0) Apr 9, 2020 at 18:38        (Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.) Add a comment |  (Expand to show all comments on this post)          2 Answers 2   Sorted by:  (/questions/61125441/get-id-of-user-on-host-from-a-docker?answertab=scoredesc#tab-top) Reset to default   (scoredesc) Highest score (default)  (trending) Trending (recent votes count more)  (modifieddesc) Date modified (newest first)  (createdasc) Date created (oldest first)            This answer is useful  (70:3:31e,16:f0e823b72abf2bf0,10:1725236606,16:63ce553a31e1ffd9,8:61267105,d6d407e357dd490a82a9c30d70d003e8b61c6da25eaf95fba53152a4919d6ae2) 1  (This answer is not useful)    (70:3:31e,16:06b6a543baebc3ab,10:1725236606,16:111f256e1a30e2f6,8:61267105,3f6cd57d05922506acc4e8ef5efbe8f74e887ed75667e2c70b90e5d2524a750b)      Save this answer.  (Loading when this answer was accepted…)     (/posts/61267105/timeline)    Show activity on this post.    I ended up solving this by mounting host folder /home on my container, and getting the id of the owner of user's home dir /home/<user> .   (/a/61267105) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/61267105/edit) () Improve this answer  Follow (70:3:31e,16:3b2daac121540d60,10:1725236606,16:cd993b0453a3f1ee,8:61267105,527375261308d3330796c6d1deb96ff31b09a96c1d7cb2a7e10da4e8327f0b08)  Follow this answer to receive notifications       answered (2020-04-17 08:22:45Z) Apr 17, 2020 at 8:22   (/users/2015376/bruno) (bruno's user avatar)    (/users/2015376/bruno) bruno bruno (reputation score) 69 (5 bronze badges)  5  5 bronze badges           (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)             This answer is useful  (70:3:31e,16:d429cd87d4a15ab7,10:1725236606,16:6ed8637f154ca65a,8:61127115,a528630059e050320b1ea8849cce4691f2a7fc81a90f486245756b16aeaab21b) 0  (This answer is not useful)    (70:3:31e,16:00ad3debf9382261,10:1725236606,16:8680e233d1b15933,8:61127115,6b88d457c0bcd02698561e60a9ae8211a8818a41878e3502c8e216406b433510)      Save this answer.  (Loading when this answer was accepted…)     (/posts/61127115/timeline)    Show activity on this post.    There's no way to get information about host users from inside a container.  A design goal of Docker is that the host and containers are isolated from each other.  A container has no concept of a host user; from the Docker daemon point of view, Docker doesn't even really know which user requested that a container be launched. (This is doubly true if your host authentication system is something more complicated like an LDAP setup: a container simply may not have the tools or credentials required to query it, and the isolation means there's no way to somehow delegate to the host.) If a principal goal of your application is to interact with host users, or the host filesystem, or you otherwise actively don't want Docker's isolation features, it's better to run your program outside of Docker.   (/a/61127115) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/61127115/edit) () Improve this answer  Follow (70:3:31e,16:aa55021499b81cf0,10:1725236606,16:d6137c423f6d55a4,8:61127115,8bbc310820f369693c4b13a5aa04cc830bc8d1922a7d2651611868f2b6d41c15)  Follow this answer to receive notifications       answered (2020-04-09 17:46:20Z) Apr 9, 2020 at 17:46   (/users/10008173/david-maze) (David Maze's user avatar)    (/users/10008173/david-maze) David Maze David Maze (reputation score 152,059) 152k (38 gold badges)  38  38 gold badges (208 silver badges)  208  208 silver badges (259 bronze badges)  259  259 bronze badges        1   Thanks for your answer. I described the use case above : I have a containerized app (Jupyter Hub), that spawns a container (Jupyter notebook server) every time a user logs in. The app should pass the id of the user to the container it spawns, so that the latter can have access to the user home folder. – (/users/2015376/bruno) (69 reputation) bruno  Commented (2020-04-09 18:43:43Z, License: CC BY-SA 4.0) Apr 9, 2020 at 18:43        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)       (61125441) (false) () Your Answer                                 Reminder: Answers generated by artificial intelligence tools are not allowed on Stack Overflow. (/help/gen-ai-policy) Learn more       (true)       Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question . Provide details and share your research!  But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience.  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