Skillset

  1. Person
  2. Education
  3. Graduation
  4. Human languages
  5. Computer languages
  6. Operating systems
  7. Mailsystems
  8. Virtualization
  9. Databases
  10. Networking and -services under Linux

Person

  • Christian Rößner
  • Born on 16th February 1975 in Darmstadt

Education

  • Trade school that includes secondary school
  • Academic studies at Fachhochschule Gießen-Friedberg

Graduation

  • Chemical-technical assistant, environmental analysis
  • Bachelor of Science Informatik

Human languages

  • German
  • English

Computer languages

  • ANSI C
  • ANSI C++
  • Python 2.x
  • Bash scripting

Operating systems

  • Linux – SuSE, Gentoo, Debian, Ubuntu (server and desktop)
  • Apple – Mac OS X (desktop)

Mailsystems

  • SMTP – Postfix
  • IMAP and POP3 – Dovecot
  • Anti-Virus and Anti-Spam – amavisd-new, spamassassin, clamav, …
  • Database bindings – using OpenLDAP, MySQL or PostgreSQL
  • Cyrus SASL – using OpenLDAP

Virtualization

  • Vmware – Linux server edition
  • KVM – using native scripts up to OpenStack cloud computing

Databases

  • Directory services – OpenLDAP with all kinds of replication mechanisms
  • MySQL – basic server knowledge, master/slave replication
  • PostgreSQL – basic server knowledge

Networking and -services under Linux

  • IPv4 and IPv6
  • Packet filtering with iptables using shorewall and shorewall6
  • manual tweaking iptables rules for special purposes
  • Advanced routing setups
  • Software Bridges and software switches – bridge tools, VDE2 and OpenVswitch
  • IPsec – basics with racoon
  • OpenVPN – advanced setups including RADIUS binding
  • FreeRADIUS – OpenVPN, LanCom and Ubiquiti access points; bound to *SQL for accounting and using OpenLDAP for authentication/authorization
  • High Availablitiy – OpenAIS/Corosync and pacemaker
  • LanCom switches
  • iSCSI and clusterd filesystems
  • NFSv4
  • Backup systems – using Bacula in distributed networks including tapes and file storages
  • SOGo – Groupwareserver
  • Apache – using FastCGI and suexec for PHP5 websites, suhosin for security; basic knowledge of mod_security; Proxy and ReWrite rules
  • Lighttp
  • SNMP monitoring
  • Automatization – cfengine

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