UNIX/DOS-encoding – ^M

Ever had the problem that you tried running a script on a linux-machine and got an error message like the following one?
-bash: ./getRaidFromIrmc.php: /usr/bin/php^M: bad interpreter: No such file or directory

The ^M indicatees that e file you are trying to run is DOS-encoded. This means that its using a CHAR 13 instead of CHAR 10 for a line break and Linux does not like that kind of line break. That often happens if you are writing a script or config file on a Windows machine and transfer it to a Linux machine.
If you try to run/parse the file in linux -> wrong encoding and BAM

The first time I ran into this problem was while deploying a RHEL machine with a faulty kickstart file, but if you know what the problem is it’s quite easy to fix it. Just run “dos2unix” over your file and everything should work again as it should work.

If you often have to modify Linux-files on widows machines I’ld recommend you to use Notepadd++, because it has a feature implemented to set the correct EOL-conversion and lots of more cool and useful plugins like the built in FTP/SFTP-plugin.

Windows performance counters and zabbix

There already quite a lot of blog posts out there which describe how to add performance counters to zabbix. In fact – its not that hard – the tricky thing is, to have one template which gets performance counters from systems wich have different languages installed.

In this case it’s a good idea to use the index of a counter. Indexes of all performance counters can be obtained from teh registry.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ Windows NT\CurrentVersion\Perflib
In this path there should be a key named “009” (would be englisch, “007” german) or similar, which contains all the key-value pairs.
The easiest way is to copy everything to an editor and look up the keys you need.

I tried to verify the counter ids by using them with “typeperf” – eg: typeperf \234(_Total)\202 but most times the result was:
Error: No valid counters.
If i used the names instead of the keys everything worked fine.

Atm I still don’t know what the reason for this error is, but, if you try it with  zabbix_get everything works fine.
zabbix_get -s server-01 -k “perf_counter[\234(_Total)\202]”
0.000000

Further details about performance counters in Zabbix can be found at:
https://www.packtpub.com/books/content/monitoring-windows-zabbix-18

Unable to mount the WIM, so the update process cannot continue.

I got the following Error after installing the MDT on my system and trying to update a Deploymentsahre which is located on my NAS.

On technet i read a tipp about restarting the machine after installing the MS AIK but that didn’t fix my problem. After another 5 mins of investigations I found out that wrong permissions could also be the reaseon for the error.

As I’m using the MDT on my private PC which has a non Admin user as default user I retried it with admin rights and now it works.
So if you’r also encountering this error – check your permissions.

Useful tools for PXE

In this post a collection of useful tools which can be used in PXE is introduced.

Continue reading Useful tools for PXE

PXE-Boot on a Vigor2130/on your local network

Today I wanted to configure my router to support PXE-booting in my homenetwork.  Herefore the following components are requeired:

  • DHCP-server configured to distribute Bootserver
  • TFTP-Server which provides the PXE

Continue reading PXE-Boot on a Vigor2130/on your local network

Slow SSH connection / SSH needs some time to establish connection

While connecting with putty (or any other ssh-client) it could happen, that the initial connection needs some time (up to a lot of time) to establish the connection to the target system.

The Problem could occure if the system is trying to look up the DNS entry of the connecting system. If you have not configured DNS in your environment or the system can’t be found it always takes some time till the connection is established.

To disable this problem the following line has to be added/uncommented in the SSHD-conf of the target system:

#UseDNS yes

to

UseDNS no

 

 

 

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