Glossary: the words used in the console

Short definitions of the terms you meet in the console and in these guides.

Term	Meaning
Server	The machine: CPU, memory and disk, with the managed stack on it.
Application	One site on a server, with its own user, folder, PHP, domains and databases.
Gen2 / classic server	Gen2 servers run the new managed stack and console; classic servers are the earlier generation.
Release	One complete copy of the code (Magento, Laravel). Deploys build a new release and switch to it at once.
Staging	A full copy of an application to test changes before they go live.
Job	A long action that runs in the background with its own log.
PHP pool	The PHP processes of one application.
Worker	One PHP process; it handles one request at a time.
OPcache	PHP's memory of compiled code.
Redis	Fast in-memory storage for Magento's cache and sessions.
Varnish	A full page cache that serves ready pages from memory.
OpenSearch	The search engine Magento uses for catalog search.
Load average	How much work is waiting for the CPU; compare it with the number of vCPUs.
Browser check	A short page that lets browsers through and stops simple bots.
429	Too many requests: a protection limit was reached.
444	Connection closed: the request was refused (blocked or an attack tool).
fail2ban	Bans addresses that behave like attackers.
NAS	Our backup storage, which pulls your backups every night.
SPF, DKIM, DMARC	DNS records that prove your email is really from you.
A record	The DNS record that points a domain to an IPv4 address.

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