October 2012
Intermediate to advanced
419 pages
10h 47m
English
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 23. Scheduler
I was working in a data center, building out an Arista network, when I decided that I wanted to automate a command that should run every five minutes. Knowing that these super cool Arista switches run Linux, I dropped into bash and proceeded to muck around with cron. I couldn’t get it to work, got frustrated, and called my Arista sales engineer who asked, “Why not just use schedule?”
Schedule is a feature introduced in EOS 4.8 that allows the regular scheduling of commands. The cool part of this feature is that it’s completely configured from CLI. Let’s take a look at this powerful tool.
The schedule command is the root of just about
everything we’re going to do in this chapter. It’s simple to use, and the
question mark along with tab completion will get you most of what you want
to know about its function:
Arista(config)#schedule ?
WORD Scheduled job nameTo create a scheduled job, you must first specify a name for the job. Since I’m the writer, I’ll use the name GAD for my job:
Arista(config)#schedule GAD ?
interval Set interval for CLI command executionThe interval is the amount of time in minutes to wait between each iteration of the job. If you want the job to run every five minutes, the interval would be five. In version 4.9.3, acceptable values range from 1 to 1,440:
Arista(config)#schedule GAD interval ?
<1-1440> Interval in minutes for CLI command executionThe next thing I need to specify is the maximum number of logfiles that will be retained. Every time ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.