Archive for the tag 'linux'



Mar 06 2021

Why Ansible Upgrades Packages on Hold and How to Fix it

Published by under Ansible

I was writing a new Ansible role to upgrade all of my VMs. I was still using an old Rancher that only works with docker-ce package up to version 18.06. A first task holds back the package with Ansible Dpkg module, as recommended on many websites.A second step runs a full upgrade of my system […]

No responses yet

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 24 2016

How to Reuse Exchange SSL Certificate on Apache Web Server

Published by under Apache,Exchange,Security

While generating a Microsoft Exchange/IIS certificate, take the opportunity to add extra domain names and reuse it on Apache web servers. This will save you a few bucks and time, unless the CA provides a certificate for multiple platforms.First off, copy the pfx file generated with Exchange on the Apache web server. The pfx file […]

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 You may also get: AH01114: HTTP: failed to make connection to backend SELinux is most […]

No responses yet

Aug 27 2014

LVS: a Free Load-Balancer for Microsoft Exchange

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 if […]

2 responses so far

Next »