Location: St. Albans, Hertfordshire, UK. Occasional travel to London data-centres.
Core Roles/Skills: Linux system administration of ~150 hosts, monitoring (Nagios/Cacti/OpenNMS/SNMP/RRD), ad-hoc automation scripting, out of hours on-call cover, infrastructure deployment & consolidation, shared support of edge and core network infrastructure.
Maintained server infrastructure (and joint responsibility of network infrastructure) to 24/7 ensure uninterrupted service to thousands of public WiFi hotspot around the Europe.
Moved servers an immutable infrastructure using diskless PXE net-boot CentOS from the network using shared NFS storage, resulting in faster deployment of additional service nodes, reduced disk failures, known consolidated and revisioned OS builds. Also implemented a Git revision controlled repository of existing production server configurations and runtime information, physical device inventory using RackMonkey and deployment of a custom patched bash shell (jointly developed with a colleague) and centralised syslog server to aid auditing from servers and network equipment, coupled with rollout of AAA against Active Directory and Radius.