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Diffstat (limited to 'README_FILES/LINUX_README')
| -rw-r--r-- | README_FILES/LINUX_README | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/README_FILES/LINUX_README b/README_FILES/LINUX_README new file mode 100644 index 0000000..b828879 --- /dev/null +++ b/README_FILES/LINUX_README @@ -0,0 +1,74 @@ +PPoossttffiixx aanndd LLiinnuuxx + +------------------------------------------------------------------------------- + +HHoosstt llooookkuupp iissssuueess + +By default Linux /etc/hosts lookups do not support multiple IP addresses per +hostname. This causes warnings from the Postfix SMTP server that "hostname XXX +does not resolve to address YYY", and is especially a problem with hosts that +have both IPv4 and IPv6 addresses. To fix this, turn on support for multiple IP +addresses: + + /etc/host.conf: + ... + # We have machines with multiple IP addresses. + multi on + ... + +Alternatively, specify the RESOLV_MULTI environment variable in main.cf: + + /etc/postfix/main.cf: + import_environment = MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY + DISPLAY LANG=C RESOLV_MULTI=on + +BBeerrkkeelleeyy DDBB iissssuueess + +If you can't compile Postfix because the file "db.h" isn't found, then you MUST +install the Berkeley DB development package (name: db???-devel-???) that +matches your system library. You can find out what is installed with the rpm +command. For example: + + $ rrppmm --qqff //uussrr//lliibb//lliibbddbb..ssoo + db4-4.3.29-2 + +This means that you need to install db4-devel-4.3.29-2 (on some systems, +specify "rrppmm --qqff //lliibb//lliibbddbb..ssoo" instead). + +DO NOT download some Berkeley DB version from the network. Every Postfix +program will dump core when it is built with a different Berkeley DB version +than the version that is used by the system library routines. See the DB_README +file for further information. + +PPrrooccmmaaiill iissssuueess + +On RedHat Linux 7.1 and later pprrooccmmaaiill no longer has permission to write to the +mail spool directory. Workaround: + + # chmod 1777 /var/spool/mail + +LLooggggiinngg iinn aa ccoonnttaaiinneerr + +When running Postfix inside a container, you can use stdout logging as +described in MAILLOG_README. Alternatives: run syslogd inside the container, or +mount the host's syslog socket inside the container. + +SSyyssllooggdd ppeerrffoorrmmaannccee + +LINUX ssyyssllooggdd uses synchronous writes by default. Because of this, ssyyssllooggdd can +actually use more system resources than Postfix. To avoid such badness, disable +synchronous mail logfile writes by editing /etc/syslog.conf and by prepending a +- to the logfile name: + + /etc/syslog.conf: + mail.* -/var/log/mail.log + +Send a "kkiillll --HHUUPP" to the ssyyssllooggdd to make the change effective. + +OOtthheerr llooggggiinngg ppeerrffoorrmmaannccee iissssuueess + +LINUX ssyysstteemmdd intercepts all logging and enforces its own rate limits before +handing off requests to a backend such as rrssyyssllooggdd or ssyysslloogg--nngg. On a busy mail +server this can result in information loss. As a workaround, you can use +Postfix's built-in logging as described in MAILLOG_README. + |