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-rw-r--r--doc/bird.sgml18
1 files changed, 13 insertions, 5 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml
index c0999d2d..8dc872e7 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -471,17 +471,25 @@ ipv6 table
include "tablename.conf";;
</code>
- <tag><label id="opt-log">log "<m/filename/"|syslog [name <m/name/]|stderr all|{ <m/list of classes/ }</tag>
- Set logging of messages having the given class (either <cf/all/ or
- <cf/{ error|trace [, <m/.../] }/ etc.) into selected destination (a file specified
- as a filename string, syslog with optional name argument, or the stderr
- output). Classes are:
+ <tag><label id="opt-log">log "<m/filename/" [<m/limit/ "<m/backup/"] | syslog [name <m/name/] | stderr all|{ <m/list of classes/ }</tag>
+ Set logging of messages having the given class (either <cf/all/ or <cf>{
+ error|trace [, <m/.../] }</cf> etc.) into selected destination - a file
+ specified as a filename string (with optional log rotation information),
+ syslog (with optional name argument), or the stderr output.
+
+ Classes are:
<cf/info/, <cf/warning/, <cf/error/ and <cf/fatal/ for messages about local problems,
<cf/debug/ for debugging messages,
<cf/trace/ when you want to know what happens in the network,
<cf/remote/ for messages about misbehavior of remote machines,
<cf/auth/ about authentication failures,
<cf/bug/ for internal BIRD bugs.
+
+ Logging directly to file supports basic log rotation -- there is an
+ optional log file limit and a backup filename, when log file reaches the
+ limit, the current log file is renamed to the backup filename and a new
+ log file is created.
+
You may specify more than one <cf/log/ line to establish logging to
multiple destinations. Default: log everything to the system log, or
to the debug output if debugging is enabled by <cf/-d//<cf/-D/