NTP and Syslog in Linux. Kevin Breit
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1 NTP and Syslog in Linux Kevin Breit
2 Network Time Protocol (NTP) Synchronizes computer time with highly accurate time services
3 NTP Architecture Utilizes time server hierarchy. Each level is called a stratum. Core servers are "Stratum 1" servers. Servers which reference stratum 1 servers are "Stratum 2" servers. Servers which reference stratum 2 servers are "Stratum 3" servers....and so on...
4 NTP Linux Servers OpenNTPd Generic NTP server
5 All configuration examples assume Ubuntu 9.04
6 Configuring NTP Server /etc/ntp.conf - NTP configuration file Main Components - Server List server server.name.com* server anotherserver.name.com* Main Components - Restriction List restrict server.name.com nomodify notrap noquery
7 NTP Server Selection ntp.org maintains NTP addresses which point to volunteer NTP servers server 0.north-america.pool.ntp.org server 1.north-america.pool.ntp.org server 2.north-america.pool.ntp.org server 3.north-america.pool.ntp.org Note: You probably don't need to use any stratum 1 and 2 servers. Move to higher stratum numbers to keep stratum 1 and 2 servers load low and in operation.
8 NTP Server Permissions You only want certain servers to edit your time and only want to allow certain systems to connect to your NTP server. restrict name.server.com nomodify notrap noquery nomodify - Do not allow server/subnet to change ntpd settings notrap - Do not allow server information to be sent noquery - Do not allow server/subnet to query time noserve - Do not serve time on this server/subnet.* * Mostly used if server/subnet should monitor NTP server
9 NTP Served Subnet Permissions Same as NTP Server Permissions, just slightly different permissions restrict nomodify notrap Notice noquery is removed. This allows the /16 network to query the local NTP server
10 Verify NTP service bash# ntpq -p remote refid st t when poll reach delay offset jitter ======================================================= +jaded.fsck.ca u splenda.rustyte u ns2.uplogon.com u *ntp.your.org.cdma. 1 u These are the NTP servers the local service is polling time from. The third column is the stratum number. ntp.org assigned stratum 2 servers. Stratum 16 servers mean it isn't synchronized properly with that specific server.
11 Syslog Standard server on all Linux installs. Syslog logs local system events. Can also be used to log remote system events.
12 Syslog Message Levels Syslog breaks each log message into different levels. Note: Level 0 occurs if syslogd is down. So level 0 may happen if the system works fine Level Verbose Description 0 emerg system is unreachable 1 alert action must be taken immediately 2 crit the system is in a critical condition 3 err there is an error condition 4 warning there is a warning condition 5 notice a normal but significant condition 6 info purely informational message 7 debug messages generated to debug the application
13 Syslog Configuration /etc/syslog.conf Enable network logging: local7.debug /log/file/location.log Network devices each send syslog messages tagged with different local numbers. Above command would log all syslog messages tagged with local7 and debug level or higher.
14 Syslog Facilities Facilities are ways to track what process a message comes from. local0 - local7 are reserved for remote servers and network devices. Facilities can be calculated to create a priority: Priority = Facility * 8 + Level
15 Syslog Facility Numbers 0 kernel messages 1 user-level messages 2 mail system 3 system daemons 4 security/authorization messages 5 messages generated internally by syslogd 6 line printer subsystem 7 network news subsystem 8 UUCP subsystem 9 clock daemon 10 security/authorization messages 11 FTP daemon 12 NTP subsystem 13 log audit 14 log alert 15 clock daemon 16 local use 0 (local0) 17 local use 1 (local1) 18 local use 2 (local2) 19 local use 3 (local3) 20 local use 4 (local4) 21 local use 5 (local5) 22 local use 6 (local6) 23 local use 7 (local7)
16 Syslog Priority Example Printer subsystem error 51 = 6 * Kernel alert 1 = 0 * 8 + 1
17 Syslog Verification View output file configured in syslog.conf
18 Q&A
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