1 files changed, 38 insertions, 3 deletions
diff --git a/chapter07/systemd-custom.xml b/chapter07/systemd-custom.xml
index bd1119840..31f518ff2 100644
--- a/chapter07/systemd-custom.xml
+++ b/chapter07/systemd-custom.xml
@@ -53,9 +53,18 @@ EOF</userinput></screen>
 
 <screen role="nodump"><userinput>ln -sfv /dev/null /etc/systemd/system/tmp.mount</userinput></screen>
 
-    <para>This is not necessary if there is a separate partition for
-    <filename class="directory">/tmp</filename> specified in
-    <filename>/etc/fstab</filename>.</para>
+    <para>Alternatively, if a a separate partition for
+    <filename class="directory">/tmp</filename> is desired, specify that 
+    partition in an <filename>/etc/fstab</filename> entry.</para>
+
+    <warning>
+      <para>
+        Do not create the symbolic link above if a separate partition is used
+        for <filename class="directory">/tmp</filename>.  This will prvent the
+        root file system (/) from being remounted r/w and make the system
+        unusable when booted.
+      </para>
+    </warning>
 
   </sect2>
 
@@ -81,6 +90,32 @@ EOF</userinput></screen>
     <filename>tmpfiles.d(5)</filename> manual page  for file format
     details.</para>
 
+    <para>
+      Note that the syntax for the
+      <filename>/usr/lib/tmpfiles.d/*.conf</filename> files can be 
+      confusing.  For example, the default deletion of files in the /tmp directory
+      is located in <filename>/usr/lib/tmpfiles.d/tmp.conf</filename> with 
+      the line:
+
+<screen role="nodump">q /tmp 1777 root root 10d</screen>
+
+      The type field, q, discusses creating a subvolume with quotas which
+      is really only applicable to btrfs filesystems.  It references type v
+      which in turn references type d (directory). This then creates the
+      specified directory if is is not present and adjusts the permissions
+      and ownership as specified.  Contents of the directory will be
+      subject to time based cleanup if the age argument is specified.
+     </para>
+
+     <para>
+      If the default parameters are not desired, then the file should
+      be copied to <filename class="directory">/etc/tmpfiles.d</filename>
+      and edited as desired.  For example:
+
+<screen role="nodump"><userinput>mkdir -p /etc/tempfiles.d
+cp /usr/lib/tmpfiles.d/tmp.conf /etc/tempfiles.d</userinput></screen>
+     </para>
+
   </sect2>
 
   <sect2>