Tag Archives: linux

Linux: Disk recovery with ddrescue

Hi

‘ddrescue –direct’ will open the input with the O_DIRECT option for uncached reads. ‘raw devices’ are not needed on newer kernels. For older kernels see below.
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Recovery: Recover files from SD Cards or dd image

Hi,

linux has 3 tools for recovering files from a (damaged) SD Card or from an dd image taken by ddrescue. Usually all tools need an empty output directory.

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Network: Forwarding SNMP Traps by mail with snmptrapd and snmptt

Hi,

this post describes a simply way to forward all traps by E-Mail received via SNMP.

This process is splited in several steps

  • Receive the traps => snmptrapd
  • snmptrapd calls the trapshandler script after each received trap. The trap details are handed over to the script by STDIN
  • The trap handler is /usr/sbin/snmptthandler. This script spools all traps to /var/spool/snmptt
  • The snmptt gets the traps from the spool folder, translate them in a human readable format and calls a custum script defined by snmptt.conf

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Linux: Switch keyboard layout in (bash) shell

Hi,

linux allows to change the keybaord layout “on the fly”.
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Debian: Enable apt debug logging

Hi,

for troubleshooting purposes (i.e. certificate issues) it is sometimes to enable the debug logging of apt.
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