postfix-master/LINUX_README.html

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   8 <title>Postfix and Linux</title>
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  16 <h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and Linux</h1>
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  18 <hr>
  19
  20 <h2>Berkeley DB issues</h2>
  21
  22 <p> If you can't compile Postfix because the file "db.h"
  23 isn't found, then you MUST install the Berkeley DB development
  24 package (name: db???-devel-???) that matches your system library.
  25 You can find out what is installed with the rpm command. For example:
  26 </p>
  27
  28 <blockquote>
  29 <pre>
  30 $ <b>rpm -qf /usr/lib/libdb.so</b>
  31 db4-4.3.29-2
  32 </pre>
  33 </blockquote>
  34
  35 <p> This means that you need to install db4-devel-4.3.29-2 (on
  36 some systems, specify "<b>rpm -qf /lib/libdb.so</b>" instead). </p>
  37
  38 <p> DO NOT download some Berkeley DB version from the network.
  39 Every Postfix program will dump core when it is built with a different
  40 Berkeley DB version than the version that is used by the system
  41 library routines.  See the <a href="DB_README.html">DB_README</a> file for further information.
  42 </p>
  43
  44 <h2>Procmail issues</h2>
  45
  46 <p> On RedHat Linux 7.1 and later <b>procmail</b> no longer has
  47 permission
  48 to write the mail spool directory. Workaround: </p>
  49
  50 <blockquote>
  51 <pre>
  52 # chmod 1777 /var/spool/mail
  53 </pre>
  54 </blockquote>
  55
  56 <h2>Syslogd performance</h2>
  57
  58 <p> LINUX <b>syslogd</b> uses synchronous writes by default. Because
  59 of this, <b>syslogd</b> can actually use more system resources than
  60 Postfix.  To avoid such badness, disable synchronous mail logfile
  61 writes by editing /etc/syslog.conf and by prepending a - to the
  62 logfile name:  </p>
  63
  64 <blockquote>
  65 <pre>
  66 /etc/syslog.conf:
  67     mail.*                          -/var/log/mail.log
  68 </pre>
  69 </blockquote>
  70
  71 <p> Send a "<b>kill -HUP</b>" to the <b>syslogd</b> to make the
  72 change effective.  </p>
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