Hello
I can troubleshoot abd tune freebsd and postgresql. I have enough experience with both. For instance, I have set up and tuned tune freebsd on basis of asterisk for my needs.
I am a professional system administrator. i have been working at a hosting company and managed, troubleshot and optimized about 300 servers, websites, apps, databases.
Also I have experience with such technologies as Virtuozzo, different types of virtualization (OpenVZ, KVM, XEN), different distributives of OS Linux / OS Unix / OS MS Windows Server systems, VPN/DNS/IPTables/Firewalls/web servers/mail servers configuration and tuning etc.
I guarantee high quality work, quick answers and responsibility.