125 lines
2.5 KiB
HTML
125 lines
2.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SUBUID</TITLE>
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</HEAD><BODY>
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<H1>SUBUID</H1>
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Section: File Formats and Conversions (5)<BR>Updated: 05/28/2020<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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subuid - the subordinate uid file
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<A NAME="lbAC"> </A>
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<H2>DESCRIPTION</H2>
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<P>
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Each line in
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/etc/subuid
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contains a user name and a range of subordinate user ids that user is allowed to use. This is specified with three fields delimited by colons (":"). These fields are:
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<P>
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<DL COMPACT><DT id="1"><DD>
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•
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login name or UID
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</DL>
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<P>
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<DL COMPACT><DT id="2"><DD>
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•
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numerical subordinate user ID
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</DL>
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<P>
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<DL COMPACT><DT id="3"><DD>
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•
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numerical subordinate user ID count
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</DL>
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<P>
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This file specifies the user IDs that ordinary users can use, with the
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<B>newuidmap</B>
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command, to configure uid mapping in a user namespace.
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<P>
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Multiple ranges may be specified per user.
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<P>
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When large number of entries (10000-100000 or more) are defined in
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/etc/subuid, parsing performance penalty will become noticeable. In this case it is recommended to use UIDs instead of login names. Benchmarks have shown speed-ups up to 20x.
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<A NAME="lbAD"> </A>
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<H2>FILES</H2>
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<P>
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/etc/subuid
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<DL COMPACT><DT id="4"><DD>
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Per user subordinate user IDs.
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</DL>
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<P>
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/etc/subuid-
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<DL COMPACT><DT id="5"><DD>
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Backup file for /etc/subuid.
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</DL>
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<A NAME="lbAE"> </A>
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<H2>SEE ALSO</H2>
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<P>
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<B><A HREF="/cgi-bin/man/man2html?5+login.defs">login.defs</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?1+newgidmap">newgidmap</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+newuidmap">newuidmap</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+newusers">newusers</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?5+subgid">subgid</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?8+useradd">useradd</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+userdel">userdel</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+usermod">usermod</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?7+user_namespaces">user_namespaces</A></B>(7).
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="6"><A HREF="#lbAB">NAME</A><DD>
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<DT id="7"><A HREF="#lbAC">DESCRIPTION</A><DD>
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<DT id="8"><A HREF="#lbAD">FILES</A><DD>
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<DT id="9"><A HREF="#lbAE">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:06 GMT, March 31, 2021
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</BODY>
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</HTML>
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