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Syslogd. Tracking system events. Log servers. Applications are constantly encountering events which should be recorded users attempt to login with bad passwords servers can’t properly start disk runs out of space and others

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syslogd

Syslogd

Tracking system events

log servers
Log servers
  • Applications are constantly encountering events which should be recorded
    • users attempt to login with bad passwords
    • servers can’t properly start
    • disk runs out of space
    • and others
  • Many system servers are written to post messages to a log server for later analysis
issues of managing a log server
Issues of managing a log server
  • What messages are stored
  • How long to store them
  • Where should they be stored for access
  • How are the logs backed up / recycled
  • Should the server function for a network or a machine
syslog
Syslog
  • Primarily handles system messages
  • Classifies messages according
    • to the source
    • to the severity
  • Stores in files according to a configuration file
  • Usually stores in /var/log
  • Can redirect messages to
    • another machine
    • a device like a console
source subsystems
Source subsystems
  • security (same as auth),
  • syslog,
  • user,
  • uucp and
  • local0 through local7.
  • auth authpriv,
  • cron,
  • daemon,
  • kern,
  • lpr,
  • mail,
  • mark,
  • news,
message priorities
Message priorities

higher

  • panic (same as emerg),
  • emerg,
  • alert,
  • crit,
  • err, error (same as err),
  • warning, warn (same as warning),
  • notice,
  • info,
  • debug

lower

example scenario
Example scenario

User enters

bad password

syslog.conf

auth.notice

syslogd

Authentication

server

/var/log/messages

# from /etc/syslog.conf

...

auth.info /var/log/messages

slide8

syslog.conf

auth.notice

/var/log/mail.warn

syslogd

mail.warn

/var/log/messages

network

Other scenarios

remote server

syslog conf format
syslog.conf format

format

facility.priority destination

logs this level and higher priority

format

facility.=priority destination

logs ONLY this level

format

facility.!priority destination

logs NOT this level and higher priority (but all below)

format

facility.!=priority destination

logs NOT this level but ALL OTHER LEVELS

syslog conf example
syslog.conf example

# Kernel messages are first, stored in the kernel

# file, critical messages and higher ones also go

# to another host and to the console

#

kern.* /var/adm/kernel

kern.crit @finlandia

kern.crit /dev/console

kern.info;kern.!err /var/adm/kernel-info

(info thru warning)

slide11

EXAMPLE LOG FILE info -> auth.log

Feb 10 17:24:58 testserver sshd[5616]: Could not reverse map address 192.168.2.2.

Feb 10 17:24:59 testserver sshd[5616]: Accepted password for dgame from 192.168.2.2 port 1186 ssh2

Feb 10 17:25:00 testserver sshd(pam_unix)[5618]: session opened for user dgame by (uid=501)

Feb 10 17:25:05 testserver su(pam_unix)[5655]: session opened for user root by dgame(uid=501)