Forum Discussion
AltostratusNTP monitor
I am looking for a external health monitor for NTP servers, so that if one of the NTP server lost sync or ntp status switched to stratum 2, instead of marking it down in F5, I want that pool member priority to be lower than the other working one. Any help will be much appreciated.
jaikumar_f5Noctilucent
Can you share your current config for reference.
quiverHi Jai, please see below the VS and pool config. The current set up is : traffic to two NTP servers load-balanced (source address persistent) by F5 ( IOS 12.1). Problem is, current VS set up monitoring udp 123 port. Its not checking if the ntp server actually lost the sync (stratum greater than 1 o 0). So I want to set up an external monitor, which will monitor whether NTP server on stratum 1, if it loses the stratum 1, then make it forced offline, and when it restored make it enabled again.. In addition to that, if the external monitor could see both NTP Servers lost sync at given time, then switch to default udp_123 monitoring. As we don't want to lose NTP server all together.
ltm virtual cus-ntp-01 {
destination 21.12.63.252:ntp
ip-protocol udp
mask 255.255.255.255
persist {
source_addr {
default yes
}
}
pool cus-ntp
profiles {
udp { }
}
source 0.0.0.0/0
translate-address enabled
translate-port enabled
vs-index 26
}
ltm pool cus-ntp {
allow-snat no
members {
2.10.91.61.6:ntp {
address 2.10.61.6
session monitor-enabled
state up
}
2.10.61.7:ntp {
address 2.10.61.7
priority-group 2
session monitor-enabled
state up
}
}
min-active-members 1
monitor min 1 of { udp_123 }
}