Archive for the 'Linux' Category



Oct 06 2016

Processing CSV Files with Perl and Bash

Published by under Linux

Olivier, a friend of mine, had to parse a CSV file and took the opportunity to benchmark the performance of 3 programming languages.   The file contains server names and disks he needs to add up into a hash table in order to get the total disk space for each server. He assumes on his […]

No responses yet

Sep 13 2015

Apache Proxy Permission Denied 503

Published by under Apache,Linux

You are proxying Apache requests to another server and your browser throw a 503 error back: “Service temporarily unavailable” Looking at the http logs in /var/log/httpd/ssl_error_log, I am getting (13)Permission denied: proxy: HTTP: attempt to connect to (*) failed SELinux is most likely enabled and denies Apache from initiating connections to the outside. Either […]

No responses yet

Aug 27 2014

Cheap Microsoft Exchange Cluster with LVS Load Balancer

Published by under Linux

Microsoft Exchange traffic can be load-balanced with Microsoft NLB but it requires to set up 4 Exchange servers for the sake that NLB isn’t compatible with (Exchange) cluster. Most Microsoft guys do not recommend it. Among NLB downsides, Exchange services are monitored with a basic ping, meaning the service is considered to be active even […]

2 responses so far

Next »