To create a CentOS 6.5 image we will use officially recommended tool mkimage-yum.sh from Moby project. We'll use latest official centos:6 docker image. That image comes with repositories for all previous releases disabled by default
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Start our dev container
docker container run -it --name dev --rm -v $(pwd):/mnt centos:6 -
Install packages, configure yum, clone moby project:
yum -y install git yum-utils # install packages yum-config-manager --disable \* # disable all repos yum-config-manager --enable C6.5* # enable centos6.5 repos cd /root git clone https://github.com/moby/moby/ # clone project moby cd /root/moby/contrib -
Since we don't want to run this image on our dev container, we need to update last 3 lines in mkimage-yum.sh as shown below:
diff --git a/contrib/mkimage-yum.sh b/contrib/mkimage-yum.sh index 9012804..61a0779 100755 --- a/contrib/mkimage-yum.sh +++ b/contrib/mkimage-yum.sh @@ -129,8 +129,5 @@ if [ -z "$version" ]; then version=$name fi -tar --numeric-owner -c -C "$target" . | docker import - $name:$version +tar --numeric-owner -cf /mnt/"$name".tar -C "$target" . -docker run -i -t --rm $name:$version /bin/bash -c 'echo success' - -rm -rf "$target"
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To fix this bug with yum and overlayfs yum-plugin-ovl package needs to be installed. Creating rootfs for our image:
./mkimage-yum.sh -p yum-plugin-ovl centos65 -
Exit the container, we don't need it anymore (type exit or Ctrl+D)
exit -
Import the contents from a tarball to create a filesystem image:
docker import centos65.tar roman8422/centos6.5 -
The only thing left is to verify the image:
docker run --rm roman8422/centos6.5 cat /etc/issue CentOS release 6.5 (Final) Kernel \r on an \m