About

The domain name space is a name space for a DNS name that shows:

• a tree structure (ie hierarchical)
• where the hierarchy levels are separated by the dot character .

Each node on the tree corresponds to a resource set (which may be empty).

For more information, you should go to the DNS name page

Syntax

Syntax as specified by the rfc: ¹⁾

<domain> ::= <subdomain> | " "

<subdomain> ::= <label> | <subdomain> "." <label>

<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]

<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>

<let-dig-hyp> ::= <let-dig> | "-"

<let-dig> ::= <letter> | <digit>

<letter> ::= any one of the 52 alphabetic characters A through Z in
upper case and a through z in lower case

<digit> ::= any one of the ten digits 0 through 9

Documentation / Reference

• http://man7.org/linux/man-pages/man8/ip-netns.8.html
• https://www.weave.works/blog/linux-namespaces-and-go-don-t-mix