/ Centos and Debian / Ubuntu server operating systems Expert knowledge of virtualisation technology and hypervisors including vmware ESXi and Linux KVM Expert knowledge of the operation and troubleshooting of common open source application stacks including Apache and nginx webservers , PHP and Java application environments and MySQL database servers Expert knowledge of opensource infrastructure software including PF and IPtables firewalls , squid HTTP caching , memcached object cache and relayd and haproxy loadbalancers , Expert knowledge of core internet protocols such as DNS , HTTP and SMTP Expert knowledge of security protocols , software and industry standard hardening processes including SSL / TLS , IPsec , SELinux and CIS / NIST guidelines Strong knowledge of storage concepts , hardware and management including SANs , NASs , RAID and iSCSI
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