Category Archives: Linux

Stuff about Linux

Linux, Network

Network: Forwarding SNMP Traps by mail with snmptrapd and snmptt

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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

Continue reading Network: Forwarding SNMP Traps by mail with snmptrapd and snmptt →

Linux

Linux: Switch keyboard layout in (bash) shell

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Hi,

linux allows to change the keybaord layout “on the fly”.
Continue reading Linux: Switch keyboard layout in (bash) shell →

Debian, Linux

rsyslog: Configure TLS/SSL

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Hi,

to setup a remote syslog server TLS encryption is strongly recommended.

Continue reading rsyslog: Configure TLS/SSL →

Debian

Debian: Enable apt debug logging

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Hi,

for troubleshooting purposes (i.e. certificate issues) it is sometimes to enable the debug logging of apt.
Continue reading Debian: Enable apt debug logging →

Linux, openssl, Security

openssl: Verifiy failed with error 3 at 0 depth lookup: unable to get certificate CRL

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Hi,

openssl can verify certificates against the root CA/intermediate CA chain and also can check a crl list if a certificate is revoked.
Continue reading openssl: Verifiy failed with error 3 at 0 depth lookup: unable to get certificate CRL →