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authorArun Isaac <arunisaac@systemreboot.net>2019-05-10 16:56:16 +0530
committerArun Isaac <arunisaac@systemreboot.net>2019-05-14 02:54:58 +0530
commitb33454ae0b488e79faafef75a06090be6b2ac6a2 (patch)
tree61fc01c617f20a25c605aff4bc93cefa116b6a8f /gnu/system/linux-container.scm
parent1bba3e8ca89b42a2828a8553dd8b3613592960cf (diff)
downloadguix-b33454ae0b488e79faafef75a06090be6b2ac6a2.tar
guix-b33454ae0b488e79faafef75a06090be6b2ac6a2.tar.gz
linux-container: Support container network sharing.
* gnu/system/linux-container.scm (container-essential-services): If network is to be shared with the host, remove network configuration files from etc service. (containerized-operating-system): If network is to be shared with the host, remove nscd service and map host's /var/run/nscd if it exists. (container-script): If network is to be shared with the host, do not create network namespace. * guix/scripts/system.scm (system-derivation-for-action): Add #:container-shared-network? argument. (perform-action): Add #:container-shared-network? argument. (show-help): Add "-N, --network" help information. (%options): Add network option. (process-action): Call perform-action with #container-shared-network? argument. * doc/guix.texi (Invoking guix system): Document the "-N, --network" option. Co-authored-by: Christopher Baines <mail@cbaines.net>
Diffstat (limited to 'gnu/system/linux-container.scm')
-rw-r--r--gnu/system/linux-container.scm63
1 files changed, 52 insertions, 11 deletions
diff --git a/gnu/system/linux-container.scm b/gnu/system/linux-container.scm
index ded5f279fe..ce786e39b2 100644
--- a/gnu/system/linux-container.scm
+++ b/gnu/system/linux-container.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2019 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -35,7 +36,7 @@
containerized-operating-system
container-script))
-(define (container-essential-services os)
+(define* (container-essential-services os #:key shared-network?)
"Return a list of essential services corresponding to OS, a
non-containerized OS. This procedure essentially strips essential services
from OS that are needed on the bare metal and not in a container."
@@ -51,9 +52,20 @@ from OS that are needed on the bare metal and not in a container."
(let ((locale (operating-system-locale-directory os)))
(with-monad %store-monad
(return `(("locale" ,locale))))))
- base))
+ ;; If network is to be shared with the host, remove network
+ ;; configuration files from etc-service.
+ (if shared-network?
+ (modify-services base
+ (etc-service-type
+ files => (remove
+ (match-lambda
+ ((filename _)
+ (member filename
+ (map basename %network-configuration-files))))
+ files)))
+ base)))
-(define (containerized-operating-system os mappings)
+(define* (containerized-operating-system os mappings #:key shared-network?)
"Return an operating system based on OS for use in a Linux container
environment. MAPPINGS is a list of <file-system-mapping> to realize in the
containerized OS."
@@ -76,27 +88,53 @@ containerized OS."
(define useless-services
;; Services that make no sense in a container. Those that attempt to
;; access /dev/tty[0-9] in particular cannot work in a container.
- (list console-font-service-type
- mingetty-service-type
- agetty-service-type))
+ (append (list console-font-service-type
+ mingetty-service-type
+ agetty-service-type)
+ ;; Remove nscd service if network is shared with the host.
+ (if shared-network?
+ (list nscd-service-type)
+ (list))))
+
+ (define shared-network-file-mappings
+ ;; Files to map if network is to be shared with the host
+ (append %network-file-mappings
+ (let ((nscd-run-directory "/var/run/nscd"))
+ (if (file-exists? nscd-run-directory)
+ (list (file-system-mapping
+ (source nscd-run-directory)
+ (target nscd-run-directory)))
+ (list)))))
+
+ ;; (write shared-network-file-mappings)
+ ;; (newline)
(operating-system
(inherit os)
(swap-devices '()) ; disable swap
- (essential-services (container-essential-services os))
+ (essential-services (container-essential-services
+ os #:shared-network? shared-network?))
(services (remove (lambda (service)
(memq (service-kind service)
useless-services))
(operating-system-user-services os)))
- (file-systems (append (map mapping->fs (cons %store-mapping mappings))
+ (file-systems (append (map mapping->fs
+ (cons %store-mapping
+ (append mappings
+ (if shared-network?
+ shared-network-file-mappings
+ (list)))))
%container-file-systems
user-file-systems))))
-(define* (container-script os #:key (mappings '()))
+(define* (container-script os #:key (mappings '()) shared-network?)
"Return a derivation of a script that runs OS as a Linux container.
MAPPINGS is a list of <file-system> objects that specify the files/directories
that will be shared with the host system."
- (let* ((os (containerized-operating-system os mappings))
+ (let* ((os (containerized-operating-system
+ os
+ mappings
+ #:shared-network? shared-network?))
(file-systems (filter file-system-needed-for-boot?
(operating-system-file-systems os)))
(specs (map file-system->spec file-systems)))
@@ -121,6 +159,9 @@ that will be shared with the host system."
;; users and groups, which is sufficient for most cases.
;;
;; See: http://www.freedesktop.org/software/systemd/man/systemd-nspawn.html#--private-users=
- #:host-uids 65536))))
+ #:host-uids 65536
+ #:namespaces (if #$shared-network?
+ (delq 'net %namespaces)
+ %namespaces)))))
(gexp->script "run-container" script)))