Open Stack

Hi,

When I use the following command to build keystone image, I saw 
base/openstack-base image was built for the first time as the dependances, 
which is OK. 

kolla-build --registry 127.0.0.1:4000 --push keystone

But right after that, when I was building another image (for example 
rabbitmq), I saw base image was built again. Why that happend and is that 
necessary? Is there any way to keep the already built images to save 
building time? 


Thanks,
Zhijiang

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