Welcome to It-Slav.Net blog
Peter Andersson
peter@it-slav.net

I've already got a female to worry about. Her name is the Enterprise.
-- Kirk, "The Corbomite Maneuver", stardate 1514.0

Background

As an increasing number of system administrators turn to mobile devices to access information on server and network status, the number of mobile security attacks are drastically increasing. op5 addresses the issues by introducing a secure mobile app, offering IT staff a convenient and safe path to mobile server monitoring.

 

Accessing your Nagios-based monitoring system from an app in your smartphone is a convenient, fast and flexible way to stay on top of things. The problem is that a vast majority of the monitoring apps currently available in Google Play rely on the 10 year old CGI script to enable this functionality. This presents many security vulnerabilities, documented in numerous security reports across the open source community

explains Jan Josephson, CTO at op5.

 

 

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Background

As a happy owner of a pebble watch I want my op5 Monitor notifications to it. This is a simple guide howto get notifications sent directly tt a pebble watch. My phone is an Android and probably there is similar ways of getting it working on iphone aswell. The guide will work on Nagios and Naemon and other forks that has popped up the last years.

 

Phone app

I found a pebble app that could recive notifications via a sinple API: Pebble Connect

Install it and choose a good userid and usertoken.

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Background

My latest gizmo in the basement is a Netgear ReadyNAS RN104. Of cource I want to monitor it so I can be sure that it is healthy. This article describe howto monitor the RN104 by using SNMP.

The implementation monitors:

  • Disk status/temperature
  • CPU temperature
  • Fan status/speed
  • Network status
  • Admin GUI status

 

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Background

I wanted to have a LCD display on my desk showing the status of my monitor system. At the same time op5 created a competition with the coolest implementation of Raspberry PI and op5 Monitor. These things together made me getting started with my project.

The result can be seen in this video

 

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03
Feb

I'm real disappointed at Samsung handling when it comes to update of my tablet.

 

I bought the best Android tablet on the market in October 2011, it was a Samsung Galaxy Tab 10.1" with 3G, GT-P7500.  According to information from Samsung they would provide Android 4.0 Ice Cream Sandwich as soon as possible. The main reason why I payed over 460EUR for the device was that I wanted to have the possibilty to run Ice Cream Sandwich on it as soon as possible.

 

After 14 months I'm still waiting.

 

During the summer 2012 Samsung started to roll out Ice Cream Sandwich on the Galaxy Tab 10.1" around the globe. On the Samsung webpage they planed to roll out in Q4 2012 in Sweden.

I have written a several times to Samsung and asked why I still cannot upgrade my Tablet and the answer I've got is that the bundle I have will be possible to update anyday. 

 

Samsung, it is NOT acceptable to wait over a year for an upgrade on a device that has a lifetime of 2 years. 

 

My next tablet will be a Nexus.

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Filled Under: Android

Background

My son got the amazing game Minecraft as a birthday present. Of course I think I should provide the service to him and his friends to have a couple of minecraftservers to be able to play together.

Soon it became business critical and I started to think about how to monitor that the Minecraft server is up and running. After searchin Internet I did not find anything that worked so I decided to write my own.

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–cut–

The Red Herring editorial team selected the 2012 Top 100 Europe. This exceptional group of companies are among the most innovative, unique and promising companies selected from a pool of hundreds from across Europe. The Top 100 were evaluated on both quantitative and qualitative criteria, such as financial performance, technology innovation, quality of management, IP creation, CAGR, execution of strategy, and disruption in their respective industries.

–end cut–

Read more at: http://www.redherring.com/startups/top-100-europe-revelaed/

The list can be found at: http://www.redherring.com/red-herring-europe/europe-2012-top-100/

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Background

I sometimes get the question if I have any tips on a op5 Monitor alarm console. I stumbled on the possibility to use irc to present the alerts generated by op5 Monitor or Nagios. A nice feature is that the number of connected clients can be very many, severla systems can send all alerts to the same irc channel and best of all, it's geeky.

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15
Mar

Andreas Ericsson at op5 is working with major improvements of Nagios. The focus areas are:

  • Complexity reduction by moving from multi-threading to single threaded programing
  • Reducing latency
  • Disk I/O usage reduction
  • CPU usage reduction
  • Memory usage reduction

Read more at http://blogs.op5.com/development-work-on-nagios-project-to-improve-performance/

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Filled Under: Nagios, op5, op5 Monitor

Background

On my electricity meter I have a flashing LED. 1000 flashes is 1 watthour.

As a monitor geek I want to know my powerconsumption and find a 1-wire kit containing a counter and a sensor that could detect the flashing from the electricity meter.

I wrote a script that collect the data in an RRD database and graph it. 

 

 

Graph

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Background

I have a FON router which allow anyone to connect to Intenet via my network connection. I like the openess and idea behind FON but I do not want to get in trouble if someone do bad things and using my network connection.

One solution is to connect the FON accesspoint to a separate network segment and let all traffic from that network go through TOR, the onion router. 

Another feature is when I want to be anonymous on Internet I plugin my computer to that network segment.

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Background

It really annoyed me that the iowait at the cpu on the Dom 0 system was approximatly 50% when the 4 virtual system was doing more or less nothing.

I showed my earlier blogpost about VM virtualization to our sysadmin at op5. He gave me a couple of more hints that really make a big difference, the best part is that they are real simple to implement.

I also noticed that I forgot some parts in the previous article that was obvius to me.

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Background

As an it slave, I have the same problems as most datacenters:

  • Running out of space because of more and more machines get into the datacenter
  • Overheating
  • Powerconsumption

Added to the "normal" datacenter problems, I also have to deal with:

  • Wife acceptance
  • Noice, my neighbours has complained about the noice outside my basement.

To address this issues I will run a consolidation project to get fewer machines by using virtualization. As virtualization engine, KVM is choosed.

This article will describe some pitfalls I run into and how I solved them.

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01
Jan

After a couple of weeks fiddeling I can prodly announce that my new internet connection is in full use.

The new access speed is 100 Mbit/s optical fiber, iperf tests show that I can get approx 97 Mbit/s in booth directions.

Changes:

  • 100 Mbit/s internet access provided by Ownit
  • Updated firewall to OpenBSD 5.0 running on an Astaro appliance
  • Updated Webserver to Centos 6.2, virtulized with KVM
  • Updated Mailserver to Centos 6.2, virtulized with KVM

 

Happy new year

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06
Dec

 News – Monitor v5.5

Monitor 5.5 –  It’s always extra fun when we do releases. News in short are:

  • Support for offline maps – no need to have online gmap connection
  • Introducing IP traffic “weathermaps” i.e. a user friendly way to present traffic flows, being WAN or LAN traffic
  • Display monitor data on external web i.e visualise and distribute the information to greater crowd
  • Multiple of  time saving tasks such as multidelete, free text filter, save searches etc.

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01
Nov

 Nov 1, 2011.


We are pleased to announce the official release of OpenBSD 5.0.
This is our 30th release on CD-ROM (and 31th via FTP).  We remain
proud of OpenBSD's record of more than ten years with only two remote
holes in the default install.
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Filled Under: OpenBSD, sysadmin
29
Sep
The tech team at op5 have published a number of new How-To articles on the op5 Support
web. Here is a list of the most recent How-Tos:
 
Access op5 Monitor from your iPhone
 
Access op5 Monitor on Android Smartphone
 
How-to monitor a KVM installation
 
Secure communication with Cloud poller
 
Agentless Monitoring of Windows using WMI
 
How to monitor your application server with op5 Monitor and JMX4Perl
 
 
Please let me know if you have any suggestion for future How-To articles.
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My internet connection is a crappy ADSL line.

 

I noticed that I did get alot alerts from op5 Monitor complaining about high error rate on the external network. After some investigation I noticed that UDP port 5060 generated approx 1.5 Mbps in traffic and that is more or less maximum my ADSL connection can handle. UDP port 5060 that is SIP.

 

A nice graph showing the errorrates, generated by op5 Monitor:

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Background

I have a long time looked at Telldus Tellstick that can control wall-plug socket recievers and other devices. Finally I got my hands on one that my collegue wanted to sell.

This article will describe how to get it up and running on a x86_64 CentOS 6 box, the procedure would be the same on RHEL or Feodora and similiar on other Linux distributions. Unfortunatly the only distribution that has pre-made packages is Ubuntu so I will describe howto download the source code, compile it and get the amazing Telldus Tellstick up and running.

 

Kudos to Telldus that has understood the power of OpenSource and opened up the device to let third-part  vendors make solutions based on the device.

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Background

As a monitoring fanatic, I think that have mirrored disk without monitor the mirror is worse then not have a redundant disk system at all. If you think that you are safe and you are not, is worse then be aware of a risk and calculate with it.

This article will describe how I did monitoring my FreeNAS system mirrored disks status using Nagios or op5 Monitoring. I assume basic knowledge of Nagios or op5 Monitor and that a Nagios agent is installed.

 
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Background

My old NAS built on top of CentOS has some performence issues and the disks are quit old now. The hardware is leftovers that is approx 8 years old and not highend at that time either. The disks age has worried my for a time and I would like to have higher redunduncy with raid1/mirrored disks.

After some research I decided to run my new NAS on FreeNAS, which has all the features I use, like: CIFS, NFS, FTP, SSH, Rsync, Unison, iSCSI and also easy administration and disk management.

This article will describe how I did setup Nagios or op5 Monitoring on my FreeNAS system. I assume basic knowledge of Nagios or op5 Monitor.

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13
Jul

After a long wait CentOS 6 is here.

Before installing, read the release notes

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Filled Under: centos

Finally, the most important and useful widget to Ninja has arrived. As everybody in the IT industri today knows, the cloud is where we all want to go and nirvana will be accomplished. To get there it is a god idea to let your favorite monitor solution keep track of when you can read more about this holy graal.

The widget keeps track of how many times the word "moln" appear on idg.se webpage and displays it in a easy view in The Tactical Overview.

 

Screenshoots from the different modes:

 

Links:

Kudos to op5 support that has created this excellent widget 

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05
Apr

Background

It is very handy to have a temprobe attached to network devices like a Wlan router, if OpenWRT is installed it is easy to use 1-wire devices. By using this method it is possible to create wireless temperature probes that uses Wlan.

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To be able to administrate my OpenWRT router from Internet I need to open the ssh port on the Wan interface.

 

It is real simple, just add to following to /etc/config/firewall:

#open ssh on wan interface
config rule               
        option src              wan
        option dest_port        22
        option target           ACCEPT    
        option proto            tcp 

And restart the firewall:

#/etc/init.d/firewall restart

 

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