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Recently I am working in a network isolated environment, this means, I am unable to connect to internet freely. But I have to finish my working using some specific docker images, how? So I have to build them locally using iso.


Download debian dvds from internet and tranfer them into the intranet:

# ls -l debian*
-rw-r--r-- 1 dash root 3.6G Jul 21 00:59 debian-9.0.0-amd64-DVD-1.iso
-rw-r--r-- 1 dash root 4.4G Jul 21 01:57 debian-9.0.0-amd64-DVD-2.iso
-rw-r--r-- 1 dash root 4.4G Jul 21 02:52 debian-9.0.0-amd64-DVD-3.iso

Install debian in virtualbox using debian-9.0.0-amd64 DVD1 iso. Using basic desktop with sshd server.


Change the repository with following command:

# mount -t iso9660 -o loop /media/sdb/iso/debian-9.0.0-amd64-DVD-1.iso /media/sdb/debianrepo/cd1/
# mount -t iso9660 -o loop /media/sdb/iso/debian-9.0.0-amd64-DVD-2.iso /media/sdb/debianrepo/cd2/
# mount -t iso9660 -o loop /media/sdb/iso/debian-9.0.0-amd64-DVD-3.iso /media/sdb/debianrepo/cd3/

While the directory /media/sdb/debianrepo/ is the directory under the web server. Thus we could change the apt’s source file pointint to this webserver.

# vim /etc/apt/sources.list
deb	stable main contrib
deb	stable main contrib
deb	stable main contrib

Enable the Unauthenticated installation, and install vim for testing:

# vim /etc/apt/apt.conf.d/99myown 
APT::Get::AllowUnauthenticated "true";
# apt-get update
# apt-get -y install vim


Standard Bootstrap won’t be used, so we have to use a tool called demoostrap.
Download position:

# git clone

Install some necessray packages:

# apt-get install -y python3-debian apt-utils debootstrap dpkg-repack

demoostrap the basic filesystem via:

# mkdir docker_root
# ./demoostrap docker_root/
# du -hs docker_root/
179M	docker_root/

In next step we will chroot into this new filesystem and install some necessary package.


The filesystem under docker_root only contains basic filesystem. In order to work properly we have to install at least minimum apt-get, so following are the steps:

# mount -t devpts devpts docker_root/dev/pts
# mount -t proc proc docker_root/proc
# mount -t sysfs sysfs docker_root/sys

Before chroot into the system we have to download some packages manually into the docker_root folder, because in chrooted system we could only use dpkg for installation.

# mkdir -p docker_root/install
# cd docker_root/install
# wget
# wget
# wget
# wget
# wget
# wget

Now chroot in, and manually install these packages:

# chroot docker_root/
#  cd /install
# dpkg -i gpgv_2.1.18-6_amd64.deb 
# dpkg -i libstdc++6_6.3.0-18_amd64.deb 
# dpkg -i libapt-pkg5.0_1.4.6_amd64.deb 
# dpkg -i debian-archive-keyring_2017.5_all.deb 
# dpkg -i adduser_3.115_all.deb 
# dpkg -i apt_1.4.6_amd64.deb
# which apt-get

Further Modification

In host machine, we manually change the sources.list file and Now we could exit the chroot system, and tar docker_root directory,

# vim etc/apt/sources.list
deb	stable main contrib
deb	stable main contrib
deb	stable main contrib

Enable the Unauthenticated installation:

# vim etc/apt/apt.conf.d/99myown 
APT::Get::AllowUnauthenticated "true";

zip and import

tar the directory using following command:

# tar czvf docker_root.tar.gz docker_root/

Then in the untared directory you could import it into docker repository via:

# tar -c * | docker import - myowndebian:raw
# docker images | grep myowndebian
myowndebian                                                    raw                 909759ad7fad        23 seconds ago      189MB
# docker run -it myowndebian:raw /bin/bash
root@f95e7f8d6427:/# ls
bin   dev  home     lib    media  opt	root  sbin  sys  usr
boot  etc  install  lib64  mnt	  proc	run   srv   tmp  var

At this point, you have a selt-built docker box, from this start point you could add more packages into your docker images and form your own images offline. Just enjoy it!