add a warning against "yum install docker"

[Mike Chen]

According to my experience, if installing Docker with "yum" from default Redhat repo instead of the suggested "curl -sSL https://get.docker.io | bash" method, a '"docker-proxy": executable file not found' error would occur, indicating the Redhat version of Docker is potentially buggy-prone.

So would it be a good idea to add a warning against yum-installing Docker on quickstart page with some explanation?

link: https://docs.openstack.org/developer/kolla-ansible/quickstart.html

[Eduardo Gonzalez (egonzalez90)]

Quickstart guide uses curl -sSL https://get.docker.io | bash to install Docker

[Mike Chen (chenn2)]

Yes. I tried to follow the guide but connection issue forced me to work around it. Then without any knowledge of the potential consequence, I went with the easy "yum install" and the process was smooth, only to fail some other step later on.

I think for others who do not always have access to https://get.docker.io and are somewhat inexperienced like me, the chance they get into trouble is not low. So maybe we can save them some time.

[Eduardo Gonzalez (egonzalez90)]

Quickstart guide was reworked, this does not affect anymore