Blogpost archive

This is a list of all my blogposts. They range from highly technical to entry level, from Linux to PHP and server management.

If you have an interesting topic to write about, reach out and I'll see what I can do.

2014-04

2014-04-08 Patch against the heartbleed OpenSSL bug (CVE-2014-0160)

2014-03

2014-03-31 Presentation: Code Obfuscation, PHP shells & more: what hackers do once they get passed your code
2014-03-23 What if you are the network admin tasked with blocking IPs in Turkey?

2013-12

2013-12-24 Puppet performance troubleshooting: using the built-in profiler in standalone puppet apply

2013-07

2013-07-30 Puppet: Error 400 on SERVER ArgumentError: malformed format string – %S at …

2013-06

2013-05

2013-05-29 Read all keys & values from a Memcached instance
2013-05-15 Setting custom puppet facts from within your Vagrantfile

2013-04

2013-04-25 Nginx: nginx: [warn] load balancing method redefined
2013-04-15 CentOS / RHEL: configure: error: C++ compiler g++ does not work or no compiler found
2013-04-11 RVM: Installing Ruby 1.8.7 on Mac OSX 10.8

2013-02

2013-02-20 Gearman Queue error: mysql_stmt_execute failed: Unknown prepared statement handler (1)

2012-11

2012-11-27 Stop. Caching. Static. Files. In. Varnish.

2012-10

2012-10-29 Public jPackage Repository Mirror

2012-08

2012-08-31 Using telnet from the VMware 5.x ESXi shell
2012-08-10 Now stop using dsbl.org blacklisting: it’s offline
2012-08-04 e2fsck: Error allocating directory block array: Memory allocation failed

2012-07

2012-07-31 Facter/Puppet: Could not retrieve selinux: Invalid argument – /proc/self/attr/current
2012-07-24 Prevent cronjobs from overlapping in Linux
2012-07-23 Reinstall the Linux Kernel on CentOS or RHEL
2012-07-06 My thoughts on mobile webdesign
2012-07-02 CentOS 6: /usr/sbin/qpidd eating up all CPU (at 100%)
2012-07-02 A fix for the Java Leap Second bug

2012-06

2012-06-29 Running php-cgi scripts via the CLI as a webserver would (by faking them)
2012-06-27 How to install and use the EPEL repository for CentOS 5 and CentOS 6
2012-06-26 Puppet + Razor: pxe boot failing to load with ‘Operating system not found’
2012-06-25 MySQL: SHOW FUNCTION STATUS WHERE Db = ‘name’: Cannot load from mysql.proc. The table is probably corrupted
2012-06-25 Install VMware Tools via the Yum Package Manager on RHEL and CentOS
2012-06-20 Dependency errors for git installs on CentOS with EPEL repo
2012-06-18 The insanity of URL shorteners and tracking
2012-06-06 Dependency fail on php-api when installing php-mcrypt or php-mhash from EPEL on CentOS 6
2012-06-06 How to change the reserved blocks on EXT3 or EXT4 filesystem in Linux
2012-06-06 Apache + PHP on Ubuntu: apache2filter does not support gzip

2012-05

2012-05-30 Loading the 3ware/LSI 9650SE drivers into VMware ESXi
2012-05-29 Re-enabling IPv6 support on CentOS kernels after update
2012-05-09 Autoloading MIB files in client SNMP configuration on Linux

2012-04

2012-03

2012-03-31 Importing the Puppet Learning VM into VirtualBox: unknown resource type in hardware item
2012-03-30 Bad ORM is infinitely worse than bad SQL
2012-03-30 Nginx and php-fpm: upstream timed out / failed (110: Connection timed out or reset by peer) while reading
2012-03-29 PHP execution via passthru(), exec(), shell_exec(), …: sh: /php: No such file or directory
2012-03-28 Rescan disk devices on a Linux VMware virtual machine without a reboot
2012-03-22 What are the ‘encrypted_search_terms’ hits on your website/wordpress blog?
2012-03-20 OpenVZ: vzctl enter gives “Unable to open pty: No such file or directory”
2012-03-20 yum update on OpenVZ container: error: cannot open Packages database in /%{_dbpath}
2012-03-15 Enable IPv6 connectivity for Nginx
2012-03-01 Remove a single mail from the postfix queue on Linux

2012-02

2012-02-29 Xapian Bindings 1.2.7/8 in PHP: undefined symbol: zend_error_noreturn in Unknown on line
2012-02-28 SSH logins or rsync’s without using a password prompt
2012-02-28 Using ssh-copy-id on an alternative SSH destination port
2012-02-26 Incoming bandwidth limitation on OpenVZ with CentOS 6.x running on VMware ESX(i)
2012-02-26 Installing VMware Tools on a Debian 6 Linux Virtual Machine
2012-02-26 Checking the version of VMware Tools inside a Linux Virtual Machine on ESX(i)
2012-02-24 Removing a package without its dependencies in CentOS or RHEL
2012-02-24 On removing users with %postun in RPM SPEC files
2012-02-24 Nginx: password protect a directory
2012-02-21 The hidden images within PHP
2012-02-21 Changing interface back to eth0 from eth1 in Linux (CentOS/RHEL)
2012-02-20 Setting up a catch-all e-mail account on Linux using Postfix
2012-02-18 Hide PHP errors and log them to a file or syslog (php-fpm or mod_php)
2012-02-18 A vim configuration for the PHP developer
2012-02-18 PHP: php_value vs php_admin_value and the use of php_flag explained
2012-02-18 Letting memcached only listen on localhost on CentOS/RHEL
2012-02-18 Enable syntax highlighting in VIM for PHP-FPM configurations
2012-02-17 The bugged sysinfo() call in OpenVZ hosts running Kernel 2.6.32+
2012-02-15 Blocking Googlebot/MSNbot/Bingbot in Apache configuration from accessing your server/site
2012-02-11 Add ‘Options FollowSymLinks’ and avoid ‘Options SymLinksIfOwnerMatch’ in Apache to save disk I/O
2012-02-11 Avoid ‘AllowOverride All’ in Apache to limit disk I/O access
2012-02-09 RHEL 6/ CentOS 6: Slow SSH logins with DNS timeouts
2012-02-05 The infamous /w00tw00t.at.ISC.SANS.DFind GET requests in your access logs

2012-01

2011-12

2011-12-29 2011: An overview of projects & popular blogposts
2011-12-29 Ubuntu 9.10 with VMware Convertor: GrubInstaller failed – /vmware-updateGrub.sh: 38: grub: not found
2011-12-19 Plesk & DrWeb: “read error” on e-mails being scanned
2011-12-11 Porting standard Apache’s mod_rewrite rules to Nginx
2011-12-11 Enabling and disabling PHP’s APC cache on a per Virtual Host level in Apache
2011-12-11 Apache Access Log: don’t log static content
2011-12-11 Nginx Access Log: log the real user’s IP instead of the proxy
2011-12-10 Plesk: passing the authorization headers in PHP when running with FastCGI/mod_fcgid
2011-12-03 Zabbix: monitor a TCP port with the Zabbix Agent

2011-11

2011-11-30 Ground rules for when compiling applications from source
2011-11-27 Varnish running in foreground but fails to run as service/daemon
2011-11-26 Varnish: filter by Source IP using Varnishlog (in Varnish 2.x, 3.x and 4.x)
2011-11-25 Varnish: varnishhist/varnishtop: error while loading shared libraries: libvarnishapi.so.1: cannot open shared object file
2011-11-24 Nginx returning blank white page on PHP parsed with FastCGI or PHP-FPM
2011-11-24 RHEL6 and CentOS 6: missing libmcrypt and libmhash in default repository
2011-11-19 Fixing MySQL master-slave replication upon query error
2011-11-19 MySQL purge the binary logs from replication (mysql-bin.xxxx files)
2011-11-19 Plesk: show all FTP accounts and passwords
2011-11-19 Plesk: listing all the database account info (dbname/username/password)
2011-11-19 Plesk: listing all the mailbox account info (username/password)
2011-11-17 VMWare ESXi 4.1 Update 2: warning: syslog not configured
2011-11-13 Changing the time and timezone settings on CentOS or RHEL

2011-10

2011-10-17 Akismet letting you down? Try a simple math question.