Category Archives: Linux

Active Directory export script to import into SME Server

I had to migrate users from an Active Directory/Exchange combo to a SME server for temporary disaster recovery event. Here’s the script I wrote to create the export and recreate the users and their aliases in the SME server. The … Continue reading

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VMware vCSA 5.1 password expiration

A few months ago, I was unable to login on my vCSA. At that time, I thought it ws a glitch, I rebooted (didn’t fix the issue) and changed the password of the users, which fixed the issue. Recently, I … Continue reading

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Nagios and Exim queue size

A simple script to check Exim queue size for Nagios NRPE: #!/bin/bash #arg1 = warning count #arg2 = critical count if [ -z “$1” ] || [ -z “$2” ] then         echo “Usage: ${0} warningcount criticalcount” else         if … Continue reading

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Ubuntu “reboot” on Supermicro X9SCI/X9SCA shuts down

On two recent Supermicro servers, typing reboot actually shuts down the server. Thanks to Google and this blogpost, major.io/2013/06/03/supermicro-x9scix9sca-server-does-a-shutdown-rather-than-a-reboot/ no longer have this issue. Short story: just blacklist the module named “mei” and you’re good.

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Mikrotik DHCP and PXE boot

If you want to boot with DHCP/PXE/TFTP method and your DHCP is handled by a Mikrotik router and your TFTP server is on another server, then you need to set the next-server and boot-file-name parameters in the network definition. Do … Continue reading

Posted in Computer, Linux, Mikrotik, Networking | 4 Comments

Ubnt AirVision, AirCam and me

This weekend, I finally had time to install a few network cameras from Ubiquiti in my house. The goal was to replace the previous system, which was composed of cheap USB webcams and the software motion , that has been … Continue reading

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Nagios and SNMP traps

It has been explained many times over the internet, so I won’t cover that. One thing you have to pay attention to is, if you run snmptt as a daemon, be sure that it has the right to write to … Continue reading

Posted in Computer, Linux, Networking, Virtualization | 1 Comment

Ubuntu netbooting needs a “new” kernel parameter

After a few hours spent trying to find why Ubuntu 12.04 would not download a preseed file while netbooting, I stumbled upon this bug bugs.launchpad.net/ubuntu/+source/casper/+bug/923219 . I needed to add “IPAPPEND 2” after the APPEND directive in the pxelinux config … Continue reading

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Exim, DNS blacklists and fail2ban

Last week, I saw an huge “spam” outbreak on my MX servers. Instead of ~200k rejected SMTP connections, I had ~3M connections and it was rising. This caused some minor issues with the frequent log parsing as the log file … Continue reading

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Varnish and Apache log files

If you use Varnish with an Apache server and analyze Apache log files (with AWstats or something else), you probably saw all requests were coming from 127.0.0.1 (or the IP address Varnish is on). You’ve probably forgotten to change the … Continue reading

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