Linux thoughts from a linux Geek (aka GEEX)

From: ciberciti  (15 Greatest Open Source Terminal Applications Of 2012) for personal reference:

## connect to mail server for testing purpose ##
openssl s_client -connect smtp.server.com:995
openssl s_client -connect smtp.server.com:995 -CApath /etc/ssl

## encrypt file ##
openssl aes-256-cbc -salt -in records-fy-2011-12.dbx   -out records-fy-2011-12.dbx.aes
## decrypt file ##
openssl aes-256-cbc -d -in records-fy-2011-12.dbx.aes -out records-fy-2011-12.dbx

Update on the TOR rpm packages for RHEL 6 and it’s clones.

For my personal reference (from http://jeff.blogs.ocjtech.us/2008/05/how-to-re-scan-scsi-bus-on-linux.html)

How to re-scan the SCSI bus on Linux
Note to self/Google, here’s how to re-scan the SCSI bus on Linux:

echo “- – -” > /sys/class/scsi_host/host0/scan

Update: Tim Verhoeven has a more complete description of the re-scanning process.
(http://misterd77.blogspot.com/2007/12/how-to-scan-scsi-bus-with-26-kernel.html)

While tuning and benchmarking an HP backup device (HPD2D backup system) I need to estimate the average file size of the IMAP server storage.
You may think I could just count the number of files and the divide the used space by the number of files, but that wasn’t the case because i don’t want all the files to count, in this case I just need the maildir files that have the email content.

About a year ago I’ve setup some linux RHEL 6 with multipath access to an HP EVA storage.
Today I needed to do it again, and to do so i needed to list all the path available to the storage device, here’s my command line (hope it helps someone else) to list all the path and volumes:

Hi,

Recently I installed a tor relay server but I couldn’t find the rpm for Scientific Linux, so i decided to get the source code and copile it myself, even better i decided to make the RPM.

I’m really short on time so I didn’t create a repo for it (if someone out there vulunters to help maintaining the repo I’ll do it)

For now here’s the rpm, enjoy.

Pedro M. S. Oliveira

PS – For those of you that doesn’t know what tor project is you may check https://www.torproject.org/

Just a link about something I found interesting, its about using BRTFS on OpenSuSE.

http://news.opensuse.org/2012/01/23/using-btrfs-on-opensuse-12-1/

Cheers,
Pedro

MENTAL NOTE – Setup bridge device on centos, rhel, scientific linux

MENTAL NOTE from http://moze.koze.net/?p=81
Converting SSL-certificates from CRT format to PEM

Dovecot, for example, seems to expect pem-files, while RapidSSL only issues
crt-files. The solution? Use OpenSSL to convert (via the DER-format) to pem:

openssl x509 -in input.crt -out input.der -outform DER

then

openssl x509 -in input.der -inform DER -out output.pem -outform PEM

There is a functionality that is also a very big security flaw – FACE RECOGNITION.
Google warns you about face recognition not being the safest of methods to unlock your phone, but nevertheless you can pass the locking feature just by using any other photo of you.