ログからcrondのメッセージをなくす

--- /etc/syslog.conf.orig
+++ /etc/syslog.conf
-*.info;mail.none;authpriv.none				/var/log/messages
+*.info;mail.none;authpriv.none;cron.none		/var/log/messages
(中略)
+# cron log
+cron.*							/var/log/cron.log

--- /etc/logrotate.d/syslog.orig
+++ /etc/logrotate.d/syslog
(中略)
+
+/var/log/cron.log {
+    daily
+    missingok
+    notifempty
+    rotate 180
+    postrotate
+        /usr/bin/killall -HUP syslogd
+    endscript
+}

参考
http://pc.watanet.com/?p=113