Highly versatile Senior System Administrator, skilled in the architectural design and implementation of high-availability systems for all major networked




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НазваниеHighly versatile Senior System Administrator, skilled in the architectural design and implementation of high-availability systems for all major networked
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Brent Geach

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Overview

Highly versatile Senior System Administrator, skilled in the architectural design and implementation of high-availability systems for all major networked services, possessing a strong background in systems and network security.

Certifications


CISSP: Certified Information Systems Security Professional (ISC2, Certificate ID:108995, May 2007)

CEH: Certified Ethical Hacker (ec-council - March 2007)

CHFI: Certified Hacking Forensics Investigator (ec-council – March 2007)

CISA: Certified Information Systems Auditor (Passed exam June 2007 – awaiting certification)

Experience


August 2005 - present

HandsOn Mobile, London, UK

Senior Systems Administrator

  • Performed internal audit of all systems and security standards

    • Upgrade of all existing servers and standardised on DELL server architecture

    • Upgrade of all network hardware (switches, routers and firewalls and standardised on Cisco network equipment)

    • Secured and standardised all OS installations to one standard build

    • Install global VPN structure to connect three data centres and 6 office locations

    • Installation of linux based firewalls at remote office locations around the globe

    • Built customised secure linux kernels

    • Built production firewalls/proxy servers with Cisco ASA 55xx

    • Installed and configured F5 load balancers utilizing iRules and port mappings (version: 9.4.3)

    • Standardised all databases globally to Mysql and MSSQL

    • Automation of various tasks with scripts using perl and bash

    • Plan and install hot DR sites in the US and EU

    • Installation and configuration of squid 2.5 and 2.6 as a reverse proxy utilising jesred as a redirector to backend web servers

    • Installation, configuration and securing of Apache (versions: 1.3.x 2.0.x and 2.2.x /Jboss (version 3.2.5) /Tomcat (versions 4 and 5) web servers

    • Installed monitoring services for production and corporate using Nagios

    • Installed global ticketing system using Request Tracker

    • Administered Microsoft IIS (versions 4, 5, 6 and 7) web server for corporate uses e.g. Sharepoint, Exchange webmail and some various other commercial products

    • Administered Microsoft MSSQL database for various corporate uses e.g. GreatPlains

    • Installed and administered netscreen vpn devices to connect to various network carriers

    • Installed and administered public DNS (bind8 and bind9) and Microsoft AD (with DNS and WINS) for internal corporate use.

    • Installed and administered public facing MTA using exim4, spamassassin and clamav which passed email onto Exchange server

Experience


June 2004- August 2005

Data Return LLC, London, UK

Assigned Systems Engineer/Datacenter supervisor

  • Installation of new servers into data center

    • Provide Linux support to various financial institutions.

    • Installation and configuration of SAN devices (EVA 5000)

    • Installation of SAN brocade switches connecting LAN servers to SAN

    • Scripted SAN automatic configuration scripts.

    • Install and configured Linux (RedHat ES4) HBA cards in order to communicate with SAN’s over fibre.

    • Troubleshooting OS and application problems on linux and windows platforms

    • Install and configure various Cisco products (router, switches and PIX’s)

    • Installation of F5 BigIP load balancers

    • Shell scripting for monitoring and custom reporting with perl and bash

    • Maintain smooth operations of all aspects within the data centre including a staff of four 24/7 shift engineers

    • Setup, configuration and troubleshooting of Apache/Tomcat/qmail/squid applications.

    • Impact analysis and documentation of software updates on RedHat 3/4 Enterprise as well as various other SAN and network devices

Experience

August 2002- June 2004

Telecom1, London, UK

Senior System Administrator

  • Designed and implemented key corporate and production systems on linux and Windows based systems

    • Performed initial audit of all systems in production, development and corporate infrastructures.

    • Installation and configuration of FreeBSD firewalls and DNS servers using BIND

    • Plan and initiate company backup policies

    • Installed and administered various MSSQL, Sybase, mysql, postgres and LDAP databases

    • Entrusted with the responsibility of migrating entire production segment from windows 2000 onto linux (Redhat) based systems.

    • Plan, research and setup a DMZ for production segment

    • Designed and implemented company-wide MTA with anti-spam and virus scanning, initially using exim but then migrating to qmail for employee e-mail

    • Configured and deployed squid HTTP proxies for corporate use

    • Extensive programming in bash and Perl

    • Web server (Apache, JBoss and Tomcat) administration

    • Installed and configured various Cisco products for DMZ including 3640 router, 2900 catalyst switches and a PIX for various local and international VPN connections

    • Researched and implemented company side monitoring software (nagios) as well as a ticketing based system for all client and company support procedures (Request Tracker or RT)

Experience

June 2001 - August 2002

iTouch, London, UK

System Administrator

  • Managed day-to-day operations of company network and linux and Windows based systems

    • Sybase DBA for production databases

    • Sybase replication server installation and administration

    • Oracle Installation and administration

    • diagnosed and eradicated system and network problems

    • implemented and administered international VPN’s (Linux FreeS/WAN IPSec)

    • implemented FreeBSD firewalls and conducted regular security audits

    • Maintained financial feeds from Standard & Poors

    • administered company-wide DNS, Web, e-mail, LDAP, Samba, NFS, CVS, and other services

    • Web server (Apache and Tomcat)

    • conducted performance analysis and tuning

    • set operating procedures and practices, technical direction, and security policy

    • Acted as mentor to other system administrators providing technical instruction and tutelage

    • Advised management on technical issues (equipment purchasing, technology standardisation)

    • Installation and configuration of SUN Solaris 8 on SUN E220R servers

    • Installation of AIX RS6000 servers

    • stalled and configured various Cisco products like 3600 routers and 2900 series switches

    • Install and maintain some Windows 2000 servers for office LAN

    • Worked with TIBCO (TIB certified)

    • Bash programming

Experience

January 2000 - June 2001

iTouch, Cape Town, South Africa

System Administrator

  • Managed day-to-day operations of company network and systems. Same duties and responsibilities as iTouch UK.

Experience

January 1997 - January 2000

NetActive SA, Cape Town, South Africa

Technical Manager

  • Administered all ISP services for thousands of users in Cape Town area

    • send mail (multiple virtual domains)

    • various POP and IMAP servers

    • Apache Web servers

    • Web caching and transparent proxying

    • Configuration of client servers using Redhat

    • All Cape Town equipment purchasing

  • Implemented Linux call-back servers using PPP over ISDN for remote system management/maintenance

  • Held responsibility for all systems and network security

  • Responsible for support team

  • Ordering and implementation of all client diginet lines

  • Installation and administration of Goldmine

Experience

March 1996 - January 1997

Tarsus Technologies, Cape Town, South Africa

Upgrade Technician

  • Upgrade and repair technician for all client computers in large store

  • Software and hardware sales

Experience

January 1996 - March 1996

Xerotype, Cape Town, South Africa

Technician

  • Upgrade and repair of on site client computers

  • Repair and maintain printer installations

Tools, Skills, and Technologies

Operating Systems: Linux (all major distributions), FreeBSD, OpenBSD, NetBSD, Solaris, IRIX, Cisco IOS, Windows NT, 2000 and XP

Hardware: x86, SUN, SGI, Cisco, SCSI, RAID, HP EVA 5000 (SAN storage device)

Linux kernel: 2.2, 2.4, 2.5, 2.6

Languages (Computer): Perl, Bash

Languages (Natural): English (native), Afrikaans (2nd Language)

E-mail: Exim, exiscan, postfix, sendmail, qmail, Courier IMAP/POP3 with SSL, Cyrus IMAP, majordomo, Mailman, SpamAssassin, Clamd antivirus, Perdition.

News: INN

Web: Apache, Tomcat, JBoss, squid, CGI, mod_perl, mod_ruby, SSL, auth_ldap, virtual hosts

LDAP: schema design, OpenLDAP 1.x/2.x

DNS: bind 4.x/8.x/9.x, DNSSEC, RIPE IP management, Nominet (.uk) management

TCP/IP: VPN’s on Cisco PIX and IPSec (FreeS/WAN), Openvpn, PPPTP, packet filtering, load balancing, transparent proxying, NAT, tunnelling, ipfw1/2, Shorewall, iptables, ipchains

NFS: Linux

Other Services: NIS, Samba, Samba authentication on Microsoft Active Directory, Winbind

Back-up: amanda, ArcServe

Databases: MySQL, PostgreSQL, Oracle, Sybase, Perl DBI

Development: autoconf, automake, gcc, gdb, make, strace, ltrace, rpm

Documentation: SGML (LinuxDoc and DocBook DTDs), dia, visio

Revision Control: CVS, RCS

Courses: Sybase DBA, Linux Administration, PC Engineer Diploma (1 year)

Memberships: British Computer Society, ISACA, Member of System Administrator's Guild

Interests

Computer security, programming, music, motorcycling, and travelling

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