I have a virtual environment running several Linux boxes and I'm planning how to manage all of the ntp architecture.
As far as I know there is no use in having two servers in 'ntp.conf' file, there should be only one or more than three ntp servers pointed by the client so, my first approach is having one server 'server1' pointing to 4 public servers, specifically RHEL ones, then having other box 'server2' pointing to server1 and below all my other Linux servers pointing to server2 but I have observed a weird behaviour with this architecture. I've seen some servers desyncing between server2 and them and even sometimes server1 and server2 aren't perfectly synced.
My first question is, why is that happening?
Then I came up with another architecture which was having the same server1 pointing to public ntp servers and then having three servers, 'server2', 'server3' and 'server4' pointing to server1 and below all my other machines pointing to servers2-4.
Is there a chance this architecture could improve the syncing within all my network?
Or would it be the same performance between syncs?
What would be the best way to architecture this?
Here is the output of
ntpq -p from server1:
remote refid st t when poll reach delay offset jitter ========================================================================= *Time100.Stupi. .PPS. 1 u 317 1024 377 182.786 5.327 3.022 LOCAL(0) .LOCL. 10 l 46h 64 0 0.000 0.000 0.000
And here its
# For more information about this file, see the man pages # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5). driftfile /var/lib/ntp/drift # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system. restrict default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery # Permit all access over the loopback interface. This could # be tightened as well, but to do so would effect some of # the administrative functions. restrict 127.0.0.1 restrict -6 ::1 # Hosts on local network are less restricted. #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). server 0.rhel.pool.ntp.org iburst server 1.rhel.pool.ntp.org iburst server 2.rhel.pool.ntp.org iburst server 3.rhel.pool.ntp.org iburst #broadcast 192.168.1.255 autokey # broadcast server #broadcastclient # broadcast client #broadcast 188.8.131.52 autokey # multicast server #multicastclient 184.108.40.206 # multicast client #manycastserver 220.127.116.11 # manycast server #manycastclient 18.104.22.168 autokey # manycast client # Enable public key cryptography. #crypto includefile /etc/ntp/crypto/pw # Key file containing the keys and key identifiers used when operating # with symmetric key cryptography. keys /etc/ntp/keys # Specify the key identifiers which are trusted. #trustedkey 4 8 42 # Specify the key identifier to use with the ntpdc utility. #requestkey 8 # Specify the key identifier to use with the ntpq utility. #controlkey 8 # Enable writing of statistics records. statistics clockstats cryptostats loopstats peerstats sysstats rawstats ### Added by IPA Installer ### server 127.127.1.0 fudge 127.127.1.0 stratum 10
Here is the output of three of the clients:
remote refid st t when poll reach delay offset jitter ============================================================================== *server1 172.16.29.21 3 u 1 64 1 1.090 -0.138 0.036 remote refid st t when poll reach delay offset jitter ============================================================================== *server1 172.16.29.21 3 u 1035 1024 377 1.117 -1.943 0.530 remote refid st t when poll reach delay offset jitter ============================================================================== *server1 172.16.29.21 3 u 32 64 1 0.902 1.788 0.140