iscaswang · September 3, 2022 04:53 · Oct 27, 2017
diff --git a/CentOS-Docker b/CentOS-Docker
@@ -0,0 +1,36 @@
+# 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/