Anaconda, the Fedora and Red Hat Enterprise Linux installer, has gained some features to facilitate building Docker images. These are only available in kickstart. To build a Docker image for HTTPD, using packages provided in the distro use the following ks.cfg file:
install
lang en_US.UTF-8
keyboard us
network --onboot yes --device eth0 --bootproto dhcp
rootpw --lock
firewall --disabled
timezone Europe/Sofia
clearpart --all --initlabel
part / --fstype=ext4 --size=1 --grow
bootloader --disabled
%packages --nocore --instLangs=en_US --excludedocs
httpd
-kernel
yum-langpacks # workaround for rhbz#1271766
%end
The above kickstart file will:
- install HTTPD and its dependencies
- disable kernel installation by excluding it from the package list
- disable installation of the boot loader using
--disabled. The resulting image will not be bootable - disable firewall
- locks the root account so it can't login from the console
- prevent installing @core using
--nocore - limit the installation of localization files using
--instLangs - limit the installation of documentation using
--excludedocs
Note: the previous --nobase option is deprected and doesn't have any effect.
After the VM installation is complete grab the contents of the root directory:
# virt-tar-out -a /var/lib/libvirt/images/disk.qcow2 / myimage.tar
Import the tarball into Docker and inspect the result:
# docker import myimage.tar local_images:ver1.0
8a2324e6d0e940a998b990262335894a17d261450c33f57dc153d3d1987e4fc1
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
local_images ver1.0 8a2324e6d0e9 13 seconds ago 320.6 MB
registry.access.redhat.com/rhel latest 82ad5fa11820 6 weeks ago 158.3 MB
registry.access.redhat.com/rhscl_beta/httpd-24-rhel7 latest 55a8a150cf2d 9 weeks ago 201.1 MB
Run commands into a new container:
# docker run --name=bash_myimage -it 8a2324e6d0e9 /bin/bash
bash-4.2# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.2 Beta (Maipo)
bash-4.2# rpm -q httpd
httpd-2.4.6-40.el7.x86_64
bash-4.2# exit
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
64f7ca6d5844 8a2324e6d0e9 "/bin/bash" 24 seconds ago Exited (0) 19 seconds ago bash_myimage
As you can see the resulting image is bigger than stock images provided by Red Hat. At this moment I don't know if this is the minimum package set which satisfies dependencies or anaconda adds a bit more on its own. The full package list is given below. There are some packages like device-mapper, dracut, e2fsprogs, iptables, kexec-tools, SELinux related, systemd and tzdata which look out of place. My guess is some of them are pulled in from the various kickstart commands and not really necessary. I will follow up with devel and see if the content can be stripped down even more.
For more information check out these docs:
- Get Started with Docker Formatted Container Images on Red Hat Systems
- Chapter 7. Get Started with Docker Formatted Container Images
Full package list:
acl-2.2.51-12.el7.x86_64
apr-1.4.8-3.el7.x86_64
apr-util-1.5.2-6.el7.x86_64
audit-libs-2.4.1-5.el7.x86_64
basesystem-10.0-7.el7.noarch
bash-4.2.46-19.el7.x86_64
bind-libs-lite-9.9.4-29.el7.x86_64
bind-license-9.9.4-29.el7.noarch
binutils-2.23.52.0.1-54.el7.x86_64
bzip2-libs-1.0.6-13.el7.x86_64
ca-certificates-2015.2.4-71.el7.noarch
chkconfig-1.3.61-5.el7.x86_64
chrony-2.1.1-1.el7.x86_64
coreutils-8.22-15.el7.x86_64
cpio-2.11-24.el7.x86_64
cracklib-2.9.0-11.el7.x86_64
cracklib-dicts-2.9.0-11.el7.x86_64
cryptsetup-libs-1.6.7-1.el7.x86_64
curl-7.29.0-25.el7.x86_64
cyrus-sasl-lib-2.1.26-19.2.el7.x86_64
dbus-1.6.12-13.el7.x86_64
dbus-glib-0.100-7.el7.x86_64
dbus-libs-1.6.12-13.el7.x86_64
dbus-python-1.1.1-9.el7.x86_64
device-mapper-1.02.107-5.el7.x86_64
device-mapper-libs-1.02.107-5.el7.x86_64
dhclient-4.2.5-42.el7.x86_64
dhcp-common-4.2.5-42.el7.x86_64
dhcp-libs-4.2.5-42.el7.x86_64
diffutils-3.3-4.el7.x86_64
dracut-033-358.el7.x86_64
dracut-network-033-358.el7.x86_64
e2fsprogs-1.42.9-7.el7.x86_64
e2fsprogs-libs-1.42.9-7.el7.x86_64
ebtables-2.0.10-13.el7.x86_64
elfutils-libelf-0.163-3.el7.x86_64
elfutils-libs-0.163-3.el7.x86_64
ethtool-3.15-2.el7.x86_64
expat-2.1.0-8.el7.x86_64
file-libs-5.11-31.el7.x86_64
filesystem-3.2-20.el7.x86_64
findutils-4.5.11-5.el7.x86_64
firewalld-0.3.9-14.el7.noarch
gawk-4.0.2-4.el7.x86_64
gdbm-1.10-8.el7.x86_64
glib2-2.42.2-5.el7.x86_64
glibc-2.17-105.el7.x86_64
glibc-common-2.17-105.el7.x86_64
gmp-6.0.0-11.el7.x86_64
gnupg2-2.0.22-3.el7.x86_64
gobject-introspection-1.42.0-1.el7.x86_64
gpgme-1.3.2-5.el7.x86_64
grep-2.20-2.el7.x86_64
gzip-1.5-8.el7.x86_64
hardlink-1.0-19.el7.x86_64
hostname-3.13-3.el7.x86_64
httpd-2.4.6-40.el7.x86_64
httpd-tools-2.4.6-40.el7.x86_64
info-5.1-4.el7.x86_64
initscripts-9.49.30-1.el7.x86_64
iproute-3.10.0-54.el7.x86_64
iptables-1.4.21-16.el7.x86_64
iputils-20121221-7.el7.x86_64
kexec-tools-2.0.7-37.el7.x86_64
keyutils-libs-1.5.8-3.el7.x86_64
kmod-20-5.el7.x86_64
kmod-libs-20-5.el7.x86_64
kpartx-0.4.9-85.el7.x86_64
krb5-libs-1.13.2-10.el7.x86_64
langtable-0.0.31-3.el7.noarch
langtable-data-0.0.31-3.el7.noarch
langtable-python-0.0.31-3.el7.noarch
libacl-2.2.51-12.el7.x86_64
libassuan-2.1.0-3.el7.x86_64
libattr-2.4.46-12.el7.x86_64
libblkid-2.23.2-26.el7.x86_64
libcap-2.22-8.el7.x86_64
libcap-ng-0.7.5-4.el7.x86_64
libcom_err-1.42.9-7.el7.x86_64
libcurl-7.29.0-25.el7.x86_64
libdb-5.3.21-19.el7.x86_64
libdb-utils-5.3.21-19.el7.x86_64
libedit-3.0-12.20121213cvs.el7.x86_64
libffi-3.0.13-16.el7.x86_64
libgcc-4.8.5-4.el7.x86_64
libgcrypt-1.5.3-12.el7_1.1.x86_64
libgpg-error-1.12-3.el7.x86_64
libidn-1.28-4.el7.x86_64
libmnl-1.0.3-7.el7.x86_64
libmount-2.23.2-26.el7.x86_64
libnetfilter_conntrack-1.0.4-2.el7.x86_64
libnfnetlink-1.0.1-4.el7.x86_64
libpwquality-1.2.3-4.el7.x86_64
libselinux-2.2.2-6.el7.x86_64
libselinux-python-2.2.2-6.el7.x86_64
libsemanage-2.1.10-18.el7.x86_64
libsepol-2.1.9-3.el7.x86_64
libss-1.42.9-7.el7.x86_64
libssh2-1.4.3-10.el7.x86_64
libstdc++-4.8.5-4.el7.x86_64
libtasn1-3.8-2.el7.x86_64
libuser-0.60-7.el7_1.x86_64
libutempter-1.1.6-4.el7.x86_64
libuuid-2.23.2-26.el7.x86_64
libverto-0.2.5-4.el7.x86_64
libxml2-2.9.1-5.el7_1.2.x86_64
lua-5.1.4-14.el7.x86_64
lzo-2.06-8.el7.x86_64
mailcap-2.1.41-2.el7.noarch
ncurses-5.9-13.20130511.el7.x86_64
ncurses-base-5.9-13.20130511.el7.noarch
ncurses-libs-5.9-13.20130511.el7.x86_64
nspr-4.10.8-1.el7_1.x86_64
nss-3.19.1-17.el7.x86_64
nss-softokn-3.16.2.3-13.el7_1.x86_64
nss-softokn-freebl-3.16.2.3-13.el7_1.x86_64
nss-sysinit-3.19.1-17.el7.x86_64
nss-tools-3.19.1-17.el7.x86_64
nss-util-3.19.1-3.el7_1.x86_64
openldap-2.4.40-8.el7.x86_64
openssl-libs-1.0.1e-42.el7_1.9.x86_64
p11-kit-0.20.7-3.el7.x86_64
p11-kit-trust-0.20.7-3.el7.x86_64
pam-1.1.8-12.el7_1.1.x86_64
pcre-8.32-15.el7.x86_64
pinentry-0.8.1-14.el7.x86_64
pkgconfig-0.27.1-4.el7.x86_64
popt-1.13-16.el7.x86_64
procps-ng-3.3.10-3.el7.x86_64
pth-2.0.7-23.el7.x86_64
pygobject3-base-3.14.0-3.el7.x86_64
pygpgme-0.3-9.el7.x86_64
pyliblzma-0.5.3-11.el7.x86_64
python-2.7.5-34.el7.x86_64
python-decorator-3.4.0-3.el7.noarch
python-iniparse-0.4-9.el7.noarch
python-libs-2.7.5-34.el7.x86_64
python-pycurl-7.19.0-17.el7.x86_64
python-slip-0.4.0-2.el7.noarch
python-slip-dbus-0.4.0-2.el7.noarch
python-urlgrabber-3.10-7.el7.noarch
pyxattr-0.5.1-5.el7.x86_64
qrencode-libs-3.4.1-3.el7.x86_64
readline-6.2-9.el7.x86_64
redhat-logos-70.0.3-4.el7.noarch
redhat-release-server-7.2-7.el7.x86_64
rpm-4.11.3-17.el7.x86_64
rpm-build-libs-4.11.3-17.el7.x86_64
rpm-libs-4.11.3-17.el7.x86_64
rpm-python-4.11.3-17.el7.x86_64
sed-4.2.2-5.el7.x86_64
setup-2.8.71-6.el7.noarch
shadow-utils-4.1.5.1-18.el7.x86_64
shared-mime-info-1.1-9.el7.x86_64
snappy-1.1.0-3.el7.x86_64
sqlite-3.7.17-8.el7.x86_64
systemd-219-19.el7.x86_64
systemd-libs-219-19.el7.x86_64
sysvinit-tools-2.88-14.dsf.el7.x86_64
tzdata-2015g-1.el7.noarch
ustr-1.0.4-16.el7.x86_64
util-linux-2.23.2-26.el7.x86_64
xz-5.1.2-12alpha.el7.x86_64
xz-libs-5.1.2-12alpha.el7.x86_64
yum-3.4.3-132.el7.noarch
yum-langpacks-0.4.2-4.el7.noarch
yum-metadata-parser-1.1.4-10.el7.x86_64
zlib-1.2.7-15.el7.x86_64
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