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Creating minimal CentOS docker image from scratch
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| # Create a folder for our new root structure | |
| $ export centos_root='/centos_image/rootfs' | |
| $ mkdir -p $centos_root | |
| # initialize rpm database | |
| $ rpm --root $centos_root --initdb | |
| # download and install the centos-release package, it contains our repository sources | |
| $ yum reinstall --downloadonly --downloaddir . centos-release | |
| $ rpm --root $centos_root -ivh centos-release*.rpm | |
| $ rpm --root $centos_root --import $centos_root/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 | |
| # install yum without docs and install only the english language files during the process | |
| $ yum -y --installroot=$centos_root --setopt=tsflags='nodocs' --setopt=override_install_langs=en_US.utf8 install yum | |
| # configure yum to avoid installing of docs and other language files than english generally | |
| $ sed -i "/distroverpkg=centos-release/a override_install_langs=en_US.utf8\ntsflags=nodocs" $centos_root/etc/yum.conf | |
| # chroot to the environment and install some additional tools | |
| $ cp /etc/resolv.conf $centos_root/etc | |
| $ chroot $centos_root /bin/bash <<EOF | |
| yum install -y procps-ng iputils | |
| yum clean all | |
| EOF | |
| $ rm -f $centos_root/etc/resolv.conf | |
| # install and enable docker | |
| $ yum install -y docker | |
| ... | |
| $ systemctl start docker | |
| # create docker image | |
| $ tar -C $centos_root -c . | docker import - centos | |
| sha256:28843acfa85226385d2db0196db72465729db38088ea98751d4a5c3d4c85ccd | |
| $ docker images | |
| REPOSITORY TAG IMAGE ID CREATED SIZE | |
| centos latest 28843acfa852 11 seconds ago 287.7 MB | |
| # run docker image | |
| $ docker run --rm centos cat /etc/redhat-release | |
| CentOS Linux release 7.2.1511 (Core) | |
| Source: https://www.sidorenko.io/post/2016/07/creating-container-base-image-of-centos/ |
before yum install, mount -o bind /dev $centos_root/dev
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use rpm --root $centos_root -ivh centos-release*.rpm --nodeps while installing centos7 to skip /bin/sh coreutils and grep deps