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--- doc:howto:docker_openwrt_image [2014/02/14 16:41]
zoobab2
+++ doc:howto:docker_openwrt_image [2014/05/06 18:18] (current)
nodeguy Import the root file system directly preserving original /dev entries.
@@ Line 5: / Line 5: @@
 {{:media:homepage-docker-logo.png|}}
-Download first the x86 image (there should an x64 image in trunk):
+Import the base image:
 <code>
-root@turmes /home/zoobab/docker [9]# wget http://downloads.openwrt.org/attitude_adjustment/12.09-rc2/x86/generic/openwrt-x86-generic-rootfs.tar.gz
+$ docker import http://downloads.openwrt.org/attitude_adjustment/12.09/x86/generic/openwrt-x86-generic-rootfs.tar.gz openwrt-x86-generic-rootfs
---2014-02-13 00:27:19--  http://downloads.openwrt.org/attitude_adjustment/12.09-rc2/x86/generic/openwrt-x86-generic-rootfs.tar.gz
+$ docker images
-Resolving downloads.openwrt.org... 78.24.191.177
+REPOSITORY                           TAG                   IMAGE ID            CREATED             VIRTUAL SIZE
-Connecting to downloads.openwrt.org|78.24.191.177|:80... connected.
+openwrt-x86-generic-rootfs           latest                2cebd16f086c        6 minutes ago       5.283 MB
-HTTP request sent, awaiting response... 200 OK
-Length: 2221396 (2.1M) [application/octet-stream]
-Saving to: ‘openwrt-x86-generic-rootfs.tar.gz’
-%[==========================================================================================================================================================================>] 2,221,396   1.26MB/s   in 1.7s
--02-13 00:27:21 (1.26 MB/s) - ‘openwrt-x86-generic-rootfs.tar.gz’ saved [2221396/2221396]
-</code>
-Then import the rootfs.tar.gz into docker via zcat:
-<code>
-root@turmes /home/zoobab/docker [10]# zcat openwrt-x86-generic-rootfs.tar.gz | docker import - openwrt-x86
-f284db5c31d
-root@turmes /home/zoobab/docker [11]# docker images
-REPOSITORY          TAG                 ID                  CREATED             SIZE
-openwrt-x86         latest              5f284db5c31d        6 seconds ago       5.705 MB (virtual 5.705 MB)
-busybox             latest              e9aa60c60128        10 months ago       6.825 MB (virtual 6.825 MB)
 </code>
@@ Line 35: / Line 17: @@
 <code>
-root@turmes /home/zoobab/docker [14]# docker run -i openwrt-x86 cat /etc/banner
+root@turmes /home/zoobab/docker [14]# docker run -i openwrt-x86-generic-rootfs cat /etc/banner
   _______                     ________        __
  |       |.-----.-----.-----.|  |  |  |.----.|  |_
@@ Line 53: / Line 35: @@
  -----------------------------------------------------
 root@turmes /home/zoobab/docker [15]#
-</code>
-Now starting /sbin/init is more problematic:
-<code>
-root@turmes /home/zoobab/docker [15]# docker run -i openwrt-x86 /sbin/init
-init started: BusyBox v1.19.4 (2013-03-06 20:07:44 UTC)
-sysinit: date: can't set kernel time zone: Operation not permitted
-sysinit: Loading defaults
-sysinit: Loading synflood protection
-sysinit: Adding custom chains
-sysinit: Loading zones
-sysinit: Loading forwardings
-sysinit: Loading rules
-sysinit: Loading redirects
-sysinit: Loading includes
-sysinit: Optimizing conntrack
-sysinit: Loading interfaces
-sysinit: dnsmasq: failed to seed the random number generator: No such file or directory
-</code>
-It seems the needed /dev entries are not present:
-<code>
-root@turmes /home/zoobab [7]# docker run -i openwrt-x86 busybox ls /dev
-kmsg
-ptmx
-pts
-shm
-</code>
-So let's create them in the tar.gz archive:
-<code>
-root@turmes /home/zoobab/docker [13]# mkdir -pv workdir
-mkdir: created directory ‘workdir’
-root@turmes /home/zoobab/docker [14]# l
-total 4348
--rw-r--r-- 1 root root 2221396 Apr 11  2013 openwrt-x86-generic-rootfs.tar.gz
-drwxr-xr-x 2 root root    4096 Feb 13 22:04 workdir
-root@turmes /home/zoobab/docker [15]# tar -xzf openwrt-x86-generic-rootfs.tar.gz -C workdir/
-</code>
-Dev directory is empty:
-<code>
-root@turmes /home/zoobab/docker [17]# cd workdir/
-root@turmes /home/zoobab/docker/workdir [18]# l
-total 56
-drwxr-xr-x  2 root root 4096 Mar 23  2013 bin
-drwxr-xr-x  2 root root 4096 Mar 23  2013 dev
-drwxr-xr-x 13 root root 4096 Mar 23  2013 etc
-drwxr-xr-x 14 root root 4096 Mar 23  2013 lib
-drwxr-xr-x  2 root root 4096 Mar 23  2013 mnt
-drwxr-xr-x  2 root root 4096 Mar 23  2013 overlay
-drwxr-xr-x  2 root root 4096 Mar 23  2013 proc
-drwxr-xr-x  2 root root 4096 Mar 23  2013 rom
-drwxr-xr-x  2 root root 4096 Mar 23  2013 root
-drwxr-xr-x  2 root root 4096 Mar 23  2013 sbin
-drwxr-xr-x  2 root root 4096 Mar 23  2013 sys
-drwxrwxrwt  2 root root 4096 Mar 23  2013 tmp
-drwxr-xr-x  6 root root 4096 Mar 23  2013 usr
-lrwxrwxrwx  1 root root    4 Mar 23  2013 var -> /tmp
-drwxr-xr-x  4 root root 4096 Mar 23  2013 www
-root@turmes /home/zoobab/docker/workdir [19]# cd dev/
-root@turmes /home/zoobab/docker/workdir/dev [20]# l
-total 0
-root@turmes /home/zoobab/docker/workdir/dev [21]#
-</code>
-Let's create the entries:
-<code>
-root@turmes /home/zoobab/docker/workdir/dev [22]# mknod -m 622 console c 5 1
-root@turmes /home/zoobab/docker/workdir/dev [23]# mknod -m 666 null c 1 3
-root@turmes /home/zoobab/docker/workdir/dev [24]# mknod -m 666 zero c 1 5
-root@turmes /home/zoobab/docker/workdir/dev [25]# mknod -m 666 tty c 5 0
-root@turmes /home/zoobab/docker/workdir/dev [26]# mknod -m 444 random c 1 8
-root@turmes /home/zoobab/docker/workdir/dev [27]# mknod -m 444 urandom c 1 9
-root@turmes /home/zoobab/docker/workdir/dev [28]# ls -al
-total 8
-drwxr-xr-x  2 root root 4096 Feb 13 22:11 .
-drwxr-xr-x 16 root root 4096 Mar 23  2013 ..
-crw--w--w-  1 root root 5, 1 Feb 13 22:10 console
-crw-rw-rw-  1 root root 1, 3 Feb 13 22:10 null
-cr--r--r--  1 root root 1, 8 Feb 13 22:10 random
-crw-rw-rw-  1 root root 5, 0 Feb 13 22:10 tty
-cr--r--r--  1 root root 1, 9 Feb 13 22:11 urandom
-crw-rw-rw-  1 root root 1, 5 Feb 13 22:10 zero
-</code>
-Now let's make a tar.gz:
-<code>
-root@turmes /home/zoobab/docker/workdir/dev [29]# cd ..
-root@turmes /home/zoobab/docker/workdir [30]# tar -czf ../openwrt-x86-generic-rootfs+deventries.tar.gz .
-root@turmes /home/zoobab/docker/workdir [31]# cd ..
-root@turmes /home/zoobab/docker [44]# ls -al
-total 4356
-drwxr-xr-x  3 root   root      4096 Feb 13 22:16 .
-drwx------ 36 zoobab zoobab    4096 Feb 13 21:20 ..
--rw-r--r--  1 root   root   2222094 Feb 13 22:16 openwrt-x86-generic-rootfs+deventries.tar.gz
--rw-r--r--  1 root   root   2221396 Apr 11  2013 openwrt-x86-generic-rootfs.tar.gz
-drwxr-xr-x 16 root   root      4096 Mar 23  2013 workdir
-</code>
-Now we can import this to docker:
-<code>
-root@turmes /home/zoobab/docker [47]# zcat openwrt-x86-generic-rootfs+deventries.tar.gz | docker import - openwrt-x86-generic-rootfs+deventries
-b9daeeb9a878
-root@turmes /home/zoobab/docker [48]# docker images
-REPOSITORY                               TAG                 ID                  CREATED             SIZE
-openwrt-x86-generic-rootfs+deventries    latest              b9daeeb9a878        2 seconds ago       5.705 MB (virtual 5.705 MB)
 </code>
@@ Line 183: / Line 40: @@
 <code>
-root@turmes /home/zoobab [17]# docker run -i openwrt-x86-generic-rootfs+deventries ifconfig
+root@turmes /home/zoobab [17]# docker run -i openwrt-x86-generic-rootfs ifconfig
 eth0      Link encap:Ethernet  HWaddr F2:06:70:1D:D0:65
           inet addr:172.17.0.30  Bcast:172.17.255.255  Mask:255.255.0.0
@@ Line 202: / Line 59: @@
           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
-root@turmes /home/zoobab [18]# docker run -i openwrt-x86-generic-rootfs+deventries /sbin/init
+root@turmes /home/zoobab [18]# docker run -i openwrt-x86-generic-rootfs /sbin/init
 init started: BusyBox v1.19.4 (2013-03-06 20:07:44 UTC)
 sysinit: date: can't set kernel time zone: Operation not permitted
@@ Line 232: / Line 89: @@
 <code>
-root@turmes /home/zoobab [20]# docker run -i -t openwrt-x86-generic-rootfs+deventries /bin/ash
+root@turmes /home/zoobab [20]# docker run -i -t openwrt-x86-generic-rootfs /bin/ash

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