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[bug#28128] [PATCH 2/2] scripts: system: Support container network shari
From: |
Arun Isaac |
Subject: |
[bug#28128] [PATCH 2/2] scripts: system: Support container network sharing. |
Date: |
Wed, 13 Mar 2019 15:06:10 +0530 |
* gnu/services.scm (shared-network-service-type): New variable.
* gnu/services/base.scm (%base-services): Add shared-network-service.
* gnu/system.scm (essential-services): If shared-network-service exists,
extend it to add /etc/services, /etc/nsswitch.conf and /etc/hosts.
(operating-system-etc-service): Do not add /etc/services, /etc/nsswitch.conf
and /etc/hosts.
* gnu/system/linux-container.scm (container-script): Support returning a
container script that shares the host network.
* guix/scripts/system.scm (system-derivation-for-action, 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?.
Co-authored-by: Christopher Baines <address@hidden>
---
gnu/services.scm | 9 +++++++++
gnu/services/base.scm | 4 +++-
gnu/system.scm | 27 +++++++++++++++++----------
gnu/system/linux-container.scm | 26 +++++++++++++++++++++++---
guix/scripts/system.scm | 30 +++++++++++++++++++++++-------
5 files changed, 75 insertions(+), 21 deletions(-)
diff --git a/gnu/services.scm b/gnu/services.scm
index f151bbaa9d..316b22eabb 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015, 2016, 2017, 2018 Ludovic Courtès <address@hidden>
;;; Copyright © 2016 Chris Marusich <address@hidden>
+;;; Copyright © 2019 Arun Isaac <address@hidden>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -95,6 +96,7 @@
profile-service-type
firmware-service-type
gc-root-service-type
+ shared-network-service-type
%boot-service
%activation-service
@@ -651,6 +653,13 @@ as Wifi cards.")))
"Register garbage-collector roots---i.e., store items that
will not be reclaimed by the garbage collector.")))
+(define shared-network-service-type
+ (service-type (name 'shared-network)
+ (extensions (list (service-extension etc-service-type
identity)))
+ (compose concatenate)
+ (extend append)
+ (default-value '())))
+
;;;
;;; Service folding.
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 67df4d1379..5f806fab35 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -2373,6 +2373,8 @@ to handle."
(service special-files-service-type
`(("/bin/sh" ,(file-append (canonical-package bash)
- "/bin/sh"))))))
+ "/bin/sh"))))
+
+ (service shared-network-service-type)))
;;; base.scm ends here
diff --git a/gnu/system.scm b/gnu/system.scm
index e6c86cb9ba..22f7e5d55d 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -5,6 +5,7 @@
;;; Copyright © 2016 Chris Marusich <address@hidden>
;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
;;; Copyright © 2019 Meiyo Peng <address@hidden>
+;;; Copyright © 2019 Arun Isaac <address@hidden>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -501,7 +502,21 @@ a container or that of a \"bare metal\" system."
(list %containerized-shepherd-service)
(list %linux-bare-metal-service
(service firmware-service-type
- (operating-system-firmware os))))))))
+ (operating-system-firmware os))))
+ (if (find (lambda (service)
+ (eq? (service-type-name (service-kind service))
+ 'shared-network))
+ (operating-system-user-services os))
+ (let ((nsswitch (plain-file "nsswitch.conf"
+ (name-service-switch->string
+
(operating-system-name-service-switch os)))))
+ (list (simple-service 'shared-network-extension
+ shared-network-service-type
+ `(("services" ,(file-append
net-base "/etc/services"))
+ ("nsswitch.conf"
,#~#$nsswitch)
+ ("hosts" ,#~#$(or
(operating-system-hosts-file os)
+
(default-/etc/hosts (operating-system-host-name os))))))))
+ (list))))))
(define* (operating-system-services os #:key container?)
"Return all the services of OS, including \"internal\" services that do not
@@ -592,10 +607,6 @@ directory."
"/run/current-system/profile/sbin\n")))
(issue (plain-file "issue" (operating-system-issue os)))
- (nsswitch (plain-file "nsswitch.conf"
- (name-service-switch->string
- (operating-system-name-service-switch os))))
-
;; Startup file for POSIX-compliant login shells, which set system-wide
;; environment variables.
(profile (mixed-text-file "profile" "\
@@ -679,16 +690,12 @@ then
source /run/current-system/profile/etc/profile.d/bash_completion.sh
fi\n")))
(etc-service
- `(("services" ,(file-append net-base "/etc/services"))
- ("protocols" ,(file-append net-base "/etc/protocols"))
+ `(("protocols" ,(file-append net-base "/etc/protocols"))
("rpc" ,(file-append net-base "/etc/rpc"))
("login.defs" ,#~#$login.defs)
("issue" ,#~#$issue)
- ("nsswitch.conf" ,#~#$nsswitch)
("profile" ,#~#$profile)
("bashrc" ,#~#$bashrc)
- ("hosts" ,#~#$(or (operating-system-hosts-file os)
- (default-/etc/hosts (operating-system-host-name os))))
;; Write the operating-system-host-name to /etc/hostname to prevent
;; NetworkManager from changing the system's hostname when connecting
;; to certain networks. Some discussion at
diff --git a/gnu/system/linux-container.scm b/gnu/system/linux-container.scm
index bceea41332..485623f563 100644
--- a/gnu/system/linux-container.scm
+++ b/gnu/system/linux-container.scm
@@ -1,6 +1,8 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 David Thompson <address@hidden>
;;; Copyright © 2016, 2017 Ludovic Courtès <address@hidden>
+;;; Copyright © 2019 Christopher Baines <address@hidden>
+;;; Copyright © 2019 Arun Isaac <address@hidden>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -60,11 +62,26 @@ containerized OS."
%container-file-systems
user-file-systems))))
-(define* (container-script os #:key (mappings '()))
+(define* (container-script os #:key (mappings '()) container-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
+ (operating-system
+ (inherit os)
+ (services (if container-shared-network?
+ (remove (lambda (service)
+ (case (service-type-name (service-kind
service))
+ ((nscd shared-network) #t)
+ (else #f)))
+ (operating-system-user-services os))
+ (operating-system-user-services os))))
+ (append
+ mappings
+ (if container-shared-network?
+ (cons %nscd-socket-mapping
+ %network-file-mappings)
+ '()))))
(file-systems (filter file-system-needed-for-boot?
(operating-system-file-systems os)))
(specs (map file-system->spec file-systems)))
@@ -93,6 +110,9 @@ 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 #$container-shared-network?
+ (delq 'net %namespaces)
+ %namespaces)))))
(gexp->script "run-container" script))))
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index d67b9f8185..c2fb1ebed5 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -4,6 +4,7 @@
;;; Copyright © 2016, 2017, 2018 Chris Marusich <address@hidden>
;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
;;; Copyright © 2018 Ricardo Wurmus <address@hidden>
+;;; Copyright © 2019 Christopher Baines <address@hidden>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -756,13 +757,16 @@ checking this by themselves in their 'check' procedure."
(define* (system-derivation-for-action os action
#:key image-size file-system-type
- full-boot? mappings)
+ full-boot? mappings
+ container-shared-network?)
"Return as a monadic value the derivation for OS according to ACTION."
(case action
((build init reconfigure)
(operating-system-derivation os))
((container)
- (container-script os #:mappings mappings))
+ (container-script os
+ #:mappings mappings
+ #:container-shared-network? container-shared-network?))
((vm-image)
(system-qemu-image os #:disk-image-size image-size))
((vm)
@@ -817,6 +821,7 @@ and TARGET arguments."
dry-run? derivations-only?
use-substitutes? bootloader-target target
image-size file-system-type full-boot?
+ container-shared-network?
(mappings '())
(gc-root #f))
"Perform ACTION for OS. INSTALL-BOOTLOADER? specifies whether to install
@@ -825,6 +830,8 @@ target root directory; IMAGE-SIZE is the size of the image
to be built, for
the 'vm-image' and 'disk-image' actions. The root file system is created as a
FILE-SYSTEM-TYPE file system. FULL-BOOT? is used for the 'vm' action; it
determines whether to boot directly to the kernel or to the bootloader.
+CONTAINER-SHARED-NETWORK? determines if the container will use a separate
+network namespace.
When DERIVATIONS-ONLY? is true, print the derivation file name(s) without
building anything.
@@ -870,11 +877,13 @@ static checks."
(check-initrd-modules os)))
(mlet* %store-monad
- ((sys (system-derivation-for-action os action
- #:file-system-type
file-system-type
- #:image-size image-size
- #:full-boot? full-boot?
- #:mappings mappings))
+ ((sys (system-derivation-for-action
+ os action
+ #:file-system-type file-system-type
+ #:image-size image-size
+ #:full-boot? full-boot?
+ #:container-shared-network? container-shared-network?
+ #:mappings mappings))
;; For 'init' and 'reconfigure', always build BOOTCFG, even if
;; --no-bootloader is passed, because we then use it as a GC root.
@@ -1011,6 +1020,8 @@ Some ACTIONS support additional ARGS.\n"))
(display (G_ "
--share=SPEC for 'vm', share host file system according to SPEC"))
(display (G_ "
+ -N, --network for 'container', allow containers to access the
network"))
+ (display (G_ "
-r, --root=FILE for 'vm', 'vm-image', 'disk-image', 'container',
and 'build', make FILE a symlink to the result, and
register it as a garbage collector root"))
@@ -1057,6 +1068,9 @@ Some ACTIONS support additional ARGS.\n"))
(lambda (opt name arg result)
(alist-cons 'image-size (size->number arg)
result)))
+ (option '(#\N "network") #f #f
+ (lambda (opt name arg result)
+ (alist-cons 'container-shared-network? #t result)))
(option '("no-bootloader" "no-grub") #f #f
(lambda (opt name arg result)
(alist-cons 'install-bootloader? #f result)))
@@ -1173,6 +1187,8 @@ resulting from command-line parsing."
#:file-system-type (assoc-ref opts
'file-system-type)
#:image-size (assoc-ref opts 'image-size)
#:full-boot? (assoc-ref opts 'full-boot?)
+ #:container-shared-network?
+ (assoc-ref opts 'container-shared-network?)
#:mappings (filter-map (match-lambda
(('file-system-mapping .
m)
m)
--
2.20.1
- [bug#28128] [PATCH 0/2] Support container network sharing, Arun Isaac, 2019/03/13
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing.,
Arun Isaac <=
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing., Ludovic Courtès, 2019/03/13
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing., Arun Isaac, 2019/03/14
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing., Ludovic Courtès, 2019/03/18
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing., Arun Isaac, 2019/03/21
- Message not available
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing., Ludovic Courtès, 2019/03/22
- [bug#28128] [PATCH 2/2] scripts: system: Support container network sharing., Arun Isaac, 2019/03/25
[bug#28128] [PATCH 1/2] shepherd: Move nscd-socket to (gnu system file-systems)., Arun Isaac, 2019/03/13