Verifique suas permissões em /var/log/auth.log
O arquivo /var/log/auth.log no meu Ubuntu 9.04 está vazio. syslogd
está em execução e o conteúdo do /etc/syslog.conf é o seguinte. Qualquer ajuda? Obrigado.
# /etc/syslog.conf Configuration file for syslogd.
#
# For more information see syslog.conf(5)
# manpage.
#
# First some standard logfiles. Log by facility.
#
auth,authpriv.* /var/log/auth.log
*.*;auth,authpriv.none -/var/log/syslog
#cron.* /var/log/cron.log
daemon.* -/var/log/daemon.log
kern.* -/var/log/kern.log
lpr.* -/var/log/lpr.log
mail.* -/var/log/mail.log
user.* -/var/log/user.log
#
# Logging for the mail system. Split it up so that
# it is easy to write scripts to parse these files.
#
mail.info -/var/log/mail.info
mail.warning -/var/log/mail.warn
mail.err /var/log/mail.err
# Logging for INN news system
#
news.crit /var/log/news/news.crit
news.err /var/log/news/news.err
news.notice -/var/log/news/news.notice
#
# Some 'catch-all' logfiles.
#
*.=debug;\
auth,authpriv.none;\
news.none;mail.none -/var/log/debug
*.=info;*.=notice;*.=warning;\
auth,authpriv.none;\
cron,daemon.none;\
mail,news.none -/var/log/messages
#
# Emergencies are sent to everybody logged in.
#
*.emerg *
#
# I like to have messages displayed on the console, but only on a virtual
# console I usually leave idle.
#
#daemon,mail.*;\
# news.=crit;news.=err;news.=notice;\
# *.=debug;*.=info;\
# *.=notice;*.=warning /dev/tty8
# The named pipe /dev/xconsole is for the 'xconsole' utility. To use it,
# you must invoke 'xconsole' with the '-file' option:
#
# $ xconsole -file /dev/xconsole [...]
#
# NOTE: adjust the list below, or you'll go crazy if you have a reasonably
# busy site..
#
daemon.*;mail.*;\
news.err;\
*.=debug;*.=info;\
*.=notice;*.=warning |/dev/xconsole
Quando eu tive o mesmo problema no Debian, descobri que tinha que reiniciar o rsyslogd:
/etc/init.d/rsyslog restart
(Seu programa syslogd pode variar).
Ele começou a gravar em /var/log/auth.log novamente.
Talvez tenha parado de fazer o log após um evento cheio de disco, não tenho certeza.
Veja também: link