[openstack-dev] [kolla] propose to remove COPY_ONCE feature

Jeffrey Zhang zhang.lei.fly at gmail.com
Thu Dec 1 02:27:42 UTC 2016

Kolla has a config_strategy option during deployment. it supports COPY_ONCE
COPY_ALWAYS.  which means whether copy the configuration files defined in
config.json again during starting containers.

COPY_ALWAYS: copy all configuration files always during every start (
             value now )
COPY_ONCE: copy only once for the first start, then it
           won't copy even the configuration is changed

COPY_ALWAYS is more common for most users. change configuration, then
containers and it works. but COPY_ONCE is not. after changing the
should remove the container and start it again.

for COPY_ONCE, the pro is keeping immutability of the container.  the con is
making thing difficult. no matter for kolla code or end-user.

I am curiosity does end-user really care about the immutability cause by
configuration file? how many user really need such a feature?

So I propose to remove COPY_ONCE.

any idea is welcome ;)

Jeffrey Zhang
Blog: http://xcodest.me
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