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Wrapping Up
Recap.
Guix environment via direnv
Setup Guix environment with direnv
Setting Up a Head Node
The node that runs the daemon.
Setting Up Compute Nodes
Client nodes.
Cluster Network Access
Dealing with network access restrictions.
Cluster Disk Usage
Disk usage considerations.
Cluster Security Considerations
Keeping the cluster secure.
Upgrade Postgres for Cuirass
Upgrading from the default postgres.
GNU@tie{}Guix is written in the general purpose programming language Scheme, and many of its features can be accessed and manipulated programmatically. You can use Scheme to generate package definitions, to modify them, to build them, to deploy whole operating systems, etc.
Knowing the basics of how to program in Scheme will unlock many of the advanced features Guix provides --- and you don't even need to be an experienced programmer to use them!
Let's get started!
Scheme, crash course
Guix uses the Guile implementation of Scheme. To start playing with the language, install it with @code{guix install guile} and start a @dfn{REPL}---short for @uref{https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop, @dfn{read-eval-print loop}}---by running @code{guile} from the command line.
Alternatively you can also run @code{guix shell guile -- guile} if you'd rather not have Guile installed in your user profile.
In the following examples, lines show what you would type at the REPL; lines starting with ``@result{}'' show evaluation results, while lines starting with ``@print{}'' show things that get printed. @xref{Using Guile Interactively,,, guile, GNU Guile Reference Manual}, for more details on the REPL.
Scheme syntax boils down to a tree of expressions (or @emph{s-expression} in Lisp lingo). An expression can be a literal such as numbers and strings, or a compound which is a parenthesized list of compounds and literals. @code{#true} and @code{#false} (abbreviated @code{#t} and @code{#f}) stand for the Booleans ``true'' and ``false'', respectively.
Examples of valid expressions:
"Hello World!"
@result{} "Hello World!"

17
@result{} 17

(display (string-append "Hello " "Guix" "\n"))
@print{} Hello Guix!
@result{} #<unspecified>
This last example is a function call nested in another function call. When a parenthesized expression is evaluated, the first term is the function and the rest are the arguments passed to the function. Every function returns the last evaluated expression as its return value.
Anonymous functions---@dfn{procedures} in Scheme parlance---are declared with the @code{lambda} term:
(lambda (x) (* x x))
@result{} #<procedure 120e348 at <unknown port>:24:0 (x)>

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Upgrading from the default postgres.
Upgrading from the default postgres.
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Source string description
type: menuentry
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read-only
Source string location
guix-git/doc/guix-cookbook.texi:210 • guix-git/doc/guix-cookbook.texi:5692
String age
3 months ago
Last updated
10 days ago
Source string age
3 months ago
Translation file
po/doc/guix-cookbook.pot, string 131