SIMPLE SOLUTIONS

NEWGIDMAP - reference manual online

Set the gid mapping of a user namespace.

Chapter
05/16/2017
NEWGIDMAP(1)                              User Commands                              NEWGIDMAP(1)

NAME newgidmap - set the gid mapping of a user namespace
SYNOPSIS newgidmap pid gid lowergid count [pid gid lowergid count [ ... ]]
DESCRIPTION The newgidmap sets /proc/[pid]/gid_map based on it's command line arguments and the gids allowed in /etc/subgid. After the pid argument, newgidmap expects sets of 3 integers: gid Begining of the range of GIDs inside the user namespace. lowergid Begining of the range of GIDs outside the user namespace. count Length of the ranges (both inside and outside the user namespace). newgidmap verifies that the caller is the owner of the process indicated by pid and that for each of the above sets, each of the GIDs in the range [lowergid, lowergid+count] is allowed to the caller according to /etc/subgid before setting /proc/[pid]/gid_map. Note that newgidmap may be used only once for a given process.
OPTIONS There currently are no options to the newgidmap command.
FILES /etc/subgid List of users subordinate group IDs. /proc/[pid]/gid_map Mapping of gids from one between user namespaces.
SEE ALSO login.defs(5), newusers(8), subgid(5), useradd(8), userdel(8), usermod(8).
shadow-utils 4.2 05/16/2017 NEWGIDMAP(1)
This manual Reference Other manuals
newgidmap(1) referred by subgid(5) | subuid(5) | user_namespaces(7)
refer to login.defs(5) | newusers(8) | subgid(5) | useradd(8) | userdel(8) | usermod(8)