apt-cacher-ng: force client on local repository

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http://askubuntu.com – I'm currently managing a dozen servers. apt-cacher-ng is installed on the development server to maintain the packages. The idea is to have exactly the same version and number of packages on the production servers. We first make the update/upgrade on the dev server, then after validating the install (which can take a few hours or a day), we make the same on the production servers. The problem is that between the time we make the update on the dev and on the production server, versions of packages may have changed so production servers won't get the same version of the packages. Can I forc (HowTos)