Hello,
i'm a sysadmin with more then 5 years experiance in TLC italian enterprise company, focused on Mission-Critical services.
I work daily on operating system GNU/Linux, RHEL, CentOS, SLES (SUSE Enterprise) and Ubuntu Server and on critical Cluster configurations made by different stacks like Pacemaker/Corosync/Heartbeat (RHCS, HAE), DRBD replication. Basic skills on Veritas VCS and HP ServiceGuard. Lots of experiance about OS hardening/security, SSH hardening and some fail2ban configuration.
Expert skills about virtualization via VMware vSphere and Citrix XenServer, network aspects (virtual switches, VLANs, trunks, port-channels, ecc.) and about resource management (memory ballooning, CPU contention, cpu/memory reservation, ecc.)
I have good knowledges of PHP web programming and skills about installation, configuration and maintenance of Apache2, Nginx, Oracle MySQL, PostgreSQL, uWSGI, ecc. and some JVM (java virtual machine) OS-related issues like heap sizing (Xmx, Xms).
I got base experience using Oracle RDBMS 10/11g.
I setup projects concerning IT server monitoring using open source software like CACTI, OpenNMS and VMware vFabric Hyperic HQ and setup backup systems using Amanda/Zmanda platform.
Good skills on managing services of different kind of Cloud Providers like Aruba (IT), Linode (FR), OVH (FR), AWS (Worldwide), BlueLightHost (UK), Contabo (DE).
Very good knowledges of Zimbra Collaboration Suite and email deliverability using SPF, DKIM, DMARC features. Lot of