NTP Trouble Shooting in Linux/AIX/Solaris/Tru64 OS.
Today we will see general NTP Trouble Shooting for different Unix Operating systems.
Lets have a look at this useful information.
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I. Restarting the NTP Daemon
| AIX |
| stopsrc -s ntpd ; startsrc -s ntpd |
| stopsrc -s xntpd ; startsrc -s xntpd |
| To check if its active at boot time: “grep -i ntp /etc/rc.tcpip” |
| To make it active at boot time: “chrctcp -S -a xntpd” |
| Linux |
| service ntpd stop ; service ntpd start |
| Solaris |
| /etc/init.d/xntpd stop ; /etc/init.d/xntpd start (Solaris 9 and below) |
| svcadm disable svc:/network/ntp:default ; svcadm enable svc:/network/ntp:default (Solaris 10 onwards) |
| Tru64 |
| /sbin/init.d/xntpd stop ; /sbin/init.d/xntpd start |
| VIOS |
| su – padmin -c “ioscli stopnetsvc xntpd” ; su – padmin -c “ioscli startnetsvc xntpd” |
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II. Troubleshooting
Use ntpq to troubleshoot (For Detailed investigation)
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# ntpq -pn
III. Understanding ntpq output.
First Column shows the 'tally code' which helps to determine the ntp sources being used. ** the source you are synchronized to (syspeer) *# source selected, distance exceeds maximum value *o the PPS(Pulse Per Second) source if your ntpd (ppspeer, only if you have a PPS capable system and refclock) *+ candidate, i.e. it is considered a good source *- outlyer, i.e. quality is not good enough *x falseticker, i.e. this one is considered to distribute bad time *blank: source discarded, failed sanity A healthy setup may include '*' and '+' tally codes. For example: remote refid st t when poll reach delay offset jitter ============================================================================== *walntp.IND.NGELgr .ntp. 1 u 248 1024 377 1.774 0.364 0.083 +burntp.IND.NGELgr .ntp. 1 u 3 1024 377 23.444 0.379 0.057 An unhealthy situation can be determined by seeing stratum '1', with time sources having varing offsets. (with 'x' tally code). remote refid st t when poll reach delay offset jitter ============================================================================== x172.17.99.101 .ntp. 1 u 948 1024 377 6.791 -999.90 0.172 x10.89.7.101 .ntp. 1 u 870 1024 377 22.931 0.113 0.409