ICT KNOWLEDGE BASE
What I run into, I write down.
Technical how-to’s and configuration notes from practice. Written so that someone else — and my future self — can pick them straight back up.
Building your Online Waiting Room (F5 BIG-IP LTM)
Absorb extreme traffic peaks with an iRule-based virtual waiting room that keeps your site stable.
Installing VSFtpD (Very Secure Ftp Deamon)
Set up a reliable FTP server with vsftpd on CentOS/RHEL, including users, firewall and SELinux settings.
Building your own WMware SRM
A working disaster-recovery scenario without the costly Site Recovery Manager, using array-based replication and a home-grown PowerShell tool.
Enabling Maintenance Mode without restarting Apache
Put your site into maintenance mode with a semaphore file — switch it on and off without restarting Apache.
Using Rsync to backup data over network or Syncing Two (Apache Web) Servers
Keep two web servers in sync with rsync over SSH — examples, options and a cron job that syncs every five minutes.
Enable / Disable SELinux (Security-Enhanced Linux) in Red Hat/CentOS
Disable SELinux temporarily or permanently — and better still: flip specific booleans instead of turning everything off.
Configure proxy setting on Linux systems to access Internet
Set the http_proxy variable — for one session, all users or a single user — and make yum work through the proxy.
Using Rsync to backup/mirror data over network
The benefits and options of rsync, with examples for local and remote syncing plus a cron job to schedule it.
How to setup a Linux Remote Management System?
Manage many Linux systems at once from Windows with plink and a batch script — using DNS settings as the example.
Linux FTP script to upload/backup files
A small FTP script that uploads files to a remote server automatically — scheduled with cron as a simple backup.