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explain the usage of 65534

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Xi Ruoyao 2022-05-02 15:36:03 +08:00
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chapter07/createfiles.xml
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@ -169,6 +169,15 @@ EOF</userinput></screen>
freely by the system administrator since well-written programs do not depend
on GID numbers, but rather use the group's name.</para>
<para>The ID 65534 is used by the kernel for NFS and separate user
namespaces for unmapped users (those exist on the NFS server or the parent
user namespace, but <quote>do not exist</quote> on the local machine or in
the separate namespace). We assign
<systemitem class="username">nobody</systemitem> and
<systemitem class="groupname">nogroup</systemitem> for it to avoid an
unnamed ID. But other distros may treat this ID differently, so any
portable program should not depend on this assignment.</para>
<para>Some tests in <xref linkend="chapter-building-system"/> need a regular
user. We add this user here and delete this account at the end of that
chapter.</para>