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What is Debian?
Debian is an operating system which is composed primarily of free and open-source software, most of which is under the GNU General Public License, and developed by a group of individuals known as the Debian project. Debian is one of the most popular Linux distributions for personal computers and network servers, and has been used as a base for several other Linux distributions.
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About this image
The debian:latest tag will always point the latest stable release (which is, at the time of this writing, debian:jessie). Stable releases are also tagged with their version (ie, debian:8 is an alias for debian:jessie, debian:7 is an alias for debian:wheezy, etc).
The rolling tags (debian:stable, debian:testing, etc) use the rolling suite names in their /etc/apt/sources.list file (ie, deb
http://httpredir.debian.org/debian testing main).
/etc/apt/sources.list
The mirror of choice for these images is httpredir.debian.org so that it's as close to optimal as possible, regardless of location or connection.
$ docker run debian:jessie cat /etc/apt/sources.list
deb http://httpredir.debian.org/debian jessie main
deb http://httpredir.debian.org/debian jessie-updates main
deb http://security.debian.org jessie/updates main