the configuration for subordinate user ids NAME subuid - the configuration for subordinate user ids DESCRIPTION Subuid authorizes a user id to m......ATE (for example to 99999 , or to the EXPIRE value from /etc/default/useradd). -v , --add-subuids FIRST - LAST Add a range of subordinate uids to the user's account. This option…...l be provided. SUB_GID_MIN (number), SUB_GID_MAX (number), SUB_GID_COUNT (number) If /etc/subuid exists, the commands useradd and newusers (unless the user already have subordin…...iable in /etc/default/useradd, or -1 by default. -F , --add-subids-for-system Update /etc/subuid and /etc/subgid even when creating a system account with -r option. -g , --gid G…...ile for /etc/subgid. SEE ALSO login.defs (5), newgidmap (1), newuidmap (1), newusers (8), subuid (5), useradd (8), userdel (8), usermod (8), user_namespaces (7)....non-zero then execution will terminate. /etc/subgid Per user subordinate group IDs. /etc/subuid Per user subordinate user IDs. EXIT VALUES The userdel command exits with the fol…...ial value auto will map the first block of user IDs owned by the effective user from /etc/subuid to a block starting at user ID 0. The special value subids will identity map the…...ng like "-sh". SUB_GID_MIN (number), SUB_GID_MAX (number), SUB_GID_COUNT (number) If /etc/subuid exists, the commands useradd and newusers (unless the user already have subordin…...gation of subordinate user/group IDs can be configured using the subid database. Refer to subuid (5) and subgid (5) for more details. Here is an example /etc/nsswitch.conf file:…overview of Linux user namespaces NAME user_namespaces - overview of Linux user namespaces DESCRIPTION For an overview of namespaces, see namespaces (7). User namespaces isolate se…