Ask HN: Monitoring historical server resource usage on linux? | Hacker News Reader

Ask HN: Monitoring historical server resource usage on linux?

11 pointsapollo20 comments

I want to be able to find performance bottlenecks after usage spikes, so I would like a tool which monitors and logs cpu, memory, disk io over time on each of my servers. These are ubuntu servers.

If you have any other suggestions for tools I can use to help find bottlenecks, I'd appreciate that too; I'm new to this.

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Collectd, I swear by it, running it on thousands of hosts without issues.

http://collectd.org/

What do you use to generate graphs?

collectd can spit out rrd files, and there are tons of rrd graphers out there.

I use drraw... it's really old and boring, but I like it for it's simplistic and I am used to it. (it's just a perl script you run on your web server, no DB needed)

Collectd is great. High resolution data collection, reliable, low resource usage. We wrote our own rrd graphs against it.

There's a ton of projects, none of which is truly easy to deploy, all of which kinda suck, and all of which store data as RRDs (which is the worst possible solution except for all the others, as the saying goes).

This is an area that could use some new blood, but apparently the existing solutions work barely well enough.

You probably know about sar, but a lot of people may not; it can get advanced with all the options, but for simple cpu spot checks:

  sar -u X Y

prints Y lines of utilization info, one every X seconds.

http://www.solarisinternals.com/wiki/index.php/Dim_STAT

<quote> All STAT data are collected from standard Solaris or Linux programs (vmstat, iostat, etc.) or some special (like psSTAT for users/processes activity) and saved in MySQL database. Collected data are accessed via Web interface and can be presented in several manner (interactive or static graphs, text, HTML tables).

dim_STAT can be used for On-Line monitoring one or several hosts on the same time. As well, data may be easily post loaded from output files of stat commands and analyzed in the same manner. At any time collecting from new stat commands may be added to the tool (via Add-On interface) and enlarge your view on application workload, RDBMS, your personal STAT program, etc. </quote>

Where I'm working at the moment we use Zabbix to monitor system availability and collect performance and trend data for 184 servers [that generate 8701 monitored items of data]. The Zabbix folk do all their development on Ubuntu and it's their preferred platform; but it works just as well on Redhat, CentOS, etc and has client agents for a wide variety of platforms.

I keep munin, http://munin.projects.linpro.no/ installed on all my servers. When things begin to look unwell, it lets you look back to see what resource, temperature, voltage, or activity might have changed.

It is alleged to be easy to add your own data points to it as well.

It's pretty easy add your own graphs, you just write a simple command line program that outputs the data you wish to graph in a simple textual format.

+1 for Munin. Very easy to install and deploy. There is a central collecting server and each host being monitored runs a fairly lightweight agent. You can write plugins in any language (bash, Perl, Ruby, PHP etc) to graph custom data points. I prefer Munin over Cacti because Munin's config is in simple text-based config files which can be scripted.

I use zabbix over ~<1000 physical and virtual hosts for historical resource usage and alerting.

Cacti for network traffic monitoring (and alerting using thold plugin).

Smokeping for network latency and availability monitoring and alerting.

Ganglia is pretty good, although it's oriented more towards detecting problems than diagnosing them post-mortem.

Are you looking only at free solutions? Or is proprietary software an option?

Free, but feel free to recommend proprietary solutions; I'm curious about what's out there

The startup I work for sells a product called "Load Monitor" (I know, real dynamic name) that provides application-centric, comprehensive monitoring (including cross-host rollup) with both a real time dashboard and historical access to collected data. Probably overkill if you only have a few servers, but it's nice if you have a few 1000: http://www.librato.com/products/load_monitor

You can try Munin, MRTG, or CACTI

Cacti.

rrdtool

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