DNS Domain Name System, domain name system.Associates the domain name of a site and an IP address for interaction between computers on a network.

NTP Network Time Protocol – a network time protocol for synchronizing the internal clock (system clock) of a GNU/Linux computer with time servers on the Internet

NTPD Network Time Protocol daemon is an operating system daemon that sets and maintains the system time synchronized with time servers using the Network Time Protocol (NTP).

Automation of system installation:

DHCP Dynamic Host Configuration Protocol.The DHCP server responds to a search with an offer of an appropriate IP that may be suitable for the client.IPs are allocated from a scope (SCOPE) of available addresses, which is specified by the administrator. If there are addresses that should not be assigned by the DHCP server, the scope is limited to only allowed addresses.

PXE Preboot eXecution Environment The pre-execution environment allows a computer (client computer) to boot using only its network card without using hard drives, CDs and other devices used to boot the operating system.

Puppet is a configuration management system. Allows centralized configuration management of operating systems and programs installed on several computers. It is used to bring hosts to the desired state and maintain this state. Puppet works on a client-server basis, although a serverless version with limited functionality is also supported.

Squid server is a software package that implements the function of a caching proxy server for the HTTP, FTP, Gopher and (if configured accordingly) HTTPS protocols.
The essence: the proxy server intercepts traffic and “mediates” between the user and the site. In this case, the user’s data is hidden from the site

This distributed file system provides users with access to files located on remote computers and allows them to work with these files in the same way as with local ones.

Monitoring servers and storing service history. Virtual machine hosting servers (KVM).

Interfaces for accessing the batch system and data from GRID.

CE (Computing Element) provides access to local batch systems, (2 services)

(Storage Element) : dCache + Enstore – access to data.All required protocols, as well as authorization methods in WLCG are provided.

VOMS service for organizing user groups to coordinate and authorize remote access to the grid.

Grid site services: site/top bdii, apel (accounting), etc.

Special grid software on interactive and accounting machines.

Frontier squid cache server – caching access with CVMFS. Frontier-squid is a patched version of the standard squid http proxy cache software, pre-configured for use by the Frontier distributed database caching system.

FTS data transfer service.