Ask HN: What do you wish monit/cacti/nagios/zabbix/etc would do?

14 pointsby Skywing15 anni fa12 comments

My co-workers and I have been writing some software to monitor the activity and health of our servers at work. We found that many of the available solutions were either painful to deal with and setup or expensive. We were hoping to find some sort of agent-based hosted solution similar to most of the current web analytics services. We couldn't find one we liked so we're creating one. We're at the point where we're just pre-processing the incoming data that we're tracking.

What type of info and data do you all think we could all use for server analytics/metrics?

6 comments

bhuga15 anni fa

I've thought about creating this about 5 times; the existing services really haven't gotten it quite right, IMO. For me, exactly what metrics to measure are not as important as the poor correlation tools. The usual suspects are fine for 'easy' and the non-usual suspects will always require custom scripts.

More important for me is letting go of 'server stats'. The existing tools you mention are stuck in pre-cloud days, assuming that I care about a graph for a particular server as opposed to the average/95th %tile/99 %tile across a group of servers filling a role.

The best solution I've found is OpenTSDB, which lets me tag any data point, which lets me tag web server CPU use metrics as 'web' and not worry about when machines go up and down when I'm looking at web server CPU use. But OpenTSDB is a pain to setup and if someone jazzed up the graphs and made it a service, I'd buy it.

Skywing15 anni fa

Correlation is also why we started this. A little story: we were using Cacti on a cluster of ours. I was showing a friend of mine the graphs, only because I was explaining our infrastructure setup. I noticed one had unusually high CPU load. The server with the high load was one of our SQL database servers. I SSHd into it and sure enough it was MySQL causing the load. But ... why? So, after so log file browsing, we found that our site was being scraped by some bots, and the particular page being scraped was doing a sorted query on a small range of data, which was causing the entire table to be sorted then scanned, which was causing high CPU usage, we thought. So, the correlation there between high CPU usage and the cause was less direct, and a simple graph was only enough to alert me of the fact that there was a problem on that machine. Plus, I wasnt even alerted - I stumbled upon it.

So, this is something we're aiming to fix.

bhuga15 anni fa

If you can correlate semantically-parsed log data with time series to automatically understand that particular problem, you're solving problems harder than server monitoring and applying them to server monitoring, IMO :) Not that there's anything wrong with that!

garyrichardson15 anni fa

I feel that Nagios style system monitoring is done. Writing Nagios plugins is fairly easy, and tools like Opsview give an API for adding servers. Monitoring disk space, memory, CPU, processes, etc works great in any of the above tools.

The problem with them is reporting data tends to be in RRD silos and doesn't work well at the application layer.

I store metric data in Graphite from my application. If there is something I want to monitor for performance purposes in my application, I put markers around it and this information goes into Graphite. This can be graphed, or CSV data can be pulled.

I want a tool that can monitor values stored in Graphite and notify me if something is out of range. I've been thinking about building a Nagios plugin that does that, I just haven't gotten around to it yet.

slysf15 anni fa

An absolutely necessary feature for me is auto-discovery. Zabbix really has this down with recent versions. If your system has comparable templating/groups and the ability to autodiscover in IP ranges you'd be +1 on most solutions. If you then added better dashboards (ala Zenoss?) and the ability to acknowledge events from emails etc then you'd really have something I'd try out.

Here's the bar for me: If I spend a few solid days on zabbix per "server class" (ie: mysql, web server, etc) I can have everything I need automatically monitored with zero effort for me going forward (to ~1000 servers). That said, acknowledgement of alerts, etc is a huge pain in zabbix.

Skywing15 anni fa

Alerts, in various forms, are definitely one of our top priorities. That was the spark that ignited our project. So, we're focused on making those as intuitive as possible.

As for auto discovery, we have a rudimentary form of this in place. Spreading of the software agent is manual, but its as easy as running it on a new server to get it up and running. The data reporting and metrics all begin automatically.

[deleted]15 anni fa

Skywing15 anni fa

Just looking for some feedback on the initial concept. Thanks.

oomkiller15 anni fa

Scout is actually pretty good, not sure if you saw it or not.

Skywing15 anni fa

I hadn't seen Scout, yet. That's good to see a similar service. Having not seen them until now, I can say that we had planned to provide slightly more for less than they do, in terms of data logging and analytics. It's neat to see them, because the things we have come up with are closely in line to them except that I think we genuinely can compete.

bhuga15 anni fa

I looked into purchasing this exact kind of service a few months ago. I admit that it was tough to find them--they are often not on the front page of google--but there were 3 or 4 players in addition to varying installable tools (sorry, names now forgotten). None really seemed to be what I want, and they were not particularly cheap. I didn't buy any, which is a customer looking to buy in the space and not finding a solution, so by all means give it a go. But you're missing some homework if you had not yet found Scout, which is front and center in this space. One of them even had a whizbang way to edit and test your little agent plugins in the browser in ruby (was that scout?) You have some mature competition here you should consider.

Skywing15 anni fa

Thanks for the response. We really started custom building our own tool, in house, to do exactly what we wanted. We manage about 150 physical servers, so we can't benefit from the underlying hypervisor info that some VM platforms provide. We have been writing our own, and subsequently feel like we could offer this at a very affordable price. We hadn't seen Scout, mostly because we just dove right into making our own tool. We're now doing some research and are finding that we're right on track in terms of being in line with functionality that others provide - like Scout. We're not tied to Ruby, though. I don't even know if our Linux servers come with Ruby - never used it. Admittedly, ours is a little less mature, which is not a bad thing since we are so new, but we're going to continue following our gut on this and just make it as useful of a tool as possible.

bhuga15 anni fa

None of the players are tied to Ruby, but the agents are often written in it (not ideal, as the usual 35MB memory footprint adds up over many servers).

In any event, don't take my call for research as a call not to join the party. The fact that you haven't heard of them means that none of them have quite solved the product/market fit stage and made it to ubiquity. Being intimidated or imitating them would not be the way to go, but knowing about them would probably be useful, and they have some good ideas.

(alternately, it means that most people prefer to do this in-house, and there's just not a market there. But I don't believe that, this is such boring stuff that happens on every project...)

anyways, good night and good luck