(See the menu for other posts in this series.) Am I in sync? So now that we've configured NTP, how do we know it's working? As Limoncelli et. al. have said, "If you aren't monitoring it, you aren't managing it." There are several tools which...
(Part 1 one of this series gave the background and rationale, and part 2 covered the basics of how NTP works.) Getting NTP Depending on how you install Linux, you might already have a pretty workable NTP client, but for the tools we'll be working...
(Part 1 covered the background and rationale. Part 3 is about installation and configuration.) What is NTP? NTP (Network Time Protocol) is an Internet standard for time synchronisation covered by multiple RFCs. "NTP is [arguably] the longest...
(With apologies to Derek Zoolander and Justin Steven. And to whoever had to touch the HP-UX NTP setup at Queensland Police after I left. And to anyone who prefers the American spelling "synchronization".) (This is the first of a series on NTP. ...
The other day I got a bug report about check_ntpmon, which was reporting UNKNOWN status back to Nagios even though everything seemed to be working fine. A bit of debugging revealed that it was receiving the message on standard error: ntpq: write...
Vyatta Core (VC) is one of my top fanboy loves. It provides a firewall/router based on Debian Linux but with an elegant configuration system modeled on Junos. Vyatta previously offered VC as a community edition of their commercial router (with...
I've always been interested in learning and developing my skills, and over the past couple of years i've been increasingly targeting my professional development. On a long commute, a great way to explore different areas of interest is listening...
Seeing progress of a long-running Linux process During the server migration mentioned in part 1, i wanted to see what a long-running rsync process was doing. Because we had done several presyncs of the data before the outage window, there was...
Server migrations with file system structure changes Last night i completed a P2V migration of a 2 TB Linux file server. It was running on an old IBM x306 server with cheap SATA disks, and we were migrating it to a VMware environment with a...
The response to my recent tweet about trying to run Cisco commands on Linux got me thinking: why shouldn't i be able to type show run on my Linux routers? For those of us who switch between Linux & Cisco (and possibly others) a lot and use the...