Setup Debian Mirrors after Installation

You just want some mirror or the closest/fastest mirror. If it's the latter, then you could just install netselect-apt and run it. I just ran to see which are the fastest form my geographical location and it said -

[$] sudo netselect-apt testing
........
........
    The fastest 10 servers seem to be:

        http://mirrors.ispros.com.bd/debian/
        http://ftp.sg.debian.org/debian/
        http://mirrors.apu.edu.my/debian/
        http://ftp.iinet.net.au/debian/debian/
        http://debian.mirror.cambrium.nl/debian/
        http://mirror.sax.uk.as61049.net/debian/
        http://ftp.uk.debian.org/debian/
        http://mirror.vorboss.net/debian/
        http://mirror.1000mbps.com/debian/
        http://ftp.antik.sk/debian/

    Of the hosts tested we choose the fastest valid for HTTP:
            http://mirrors.ispros.com.bd/debian/

    Writing sources.list.
    sources.list exists, moving to sources.list.1484862805
    Done.

[$] cat sources.list.1484862805

     1  # Debian packages for testing
     2  deb http://debian.ec.as6453.net/debian/ testing main contrib
     3  # Uncomment the deb-src line if you want 'apt-get source'
     4  # to work with most packages.
     5  # deb-src http://debian.ec.as6453.net/debian/ testing main contrib
     6  
     7  # Security updates for stable
     8  # deb http://security.debian.org/ stable/updates main contrib

Hope you find it useful.

As an alternative to the Debian redirector, you could try http://deb.debian.org/

This is a CDN powered by AWS CoudFront and should be faster than the redirector.

how to setup the debian mirror after installation?

Use apt edit-sources (as root!) to open /etc/apt/sources.list in the (command line) text editor of choice; when the file is saved it will be checked for syntax errors.

My Python script apt-smart that finds mirrors automaticly within your country, benchmarks and ranks them by status and speed, finally changes sources.list if you want to.

• apt-smart supports both Debian and Ubuntu.
• apt-smart automaticly finds where you are so you can easily get the closest/fastest mirror.
• apt-smart does real HTTP download from each mirror to get more accurate results ( bandwidth & status ) and supports HTTP proxy.
• apt-smart is being maintained, whereas many similar solutions are too old to run or leave bugs unfix for a long time.

You can easily install apt-smart via pip, for detailed copy'n'paste install commands please see Project Readme.

A usage example that lets you list ranked mirrors within your country:

$ apt-smart -l

With -l, or --list-mirrors, you will get ( example output from Travis CI U.S. Ubuntu server ):

---------------------------------------------------------------------------------------------------------
| Rank | Mirror URL                            | Available? | Updating? | Last updated    | Bandwidth   |
---------------------------------------------------------------------------------------------------------
|    1 | http://mirrors.gigenet.com/ubuntua... | Yes        | No        | Up to date      | 1.73 MB/s   |
|    2 | http://mirror.genesisadaptive.com/... | Yes        | No        | Up to date      | 1.68 MB/s   |
|    3 | http://ubuntu.mirrors.tds.net/pub/... | Yes        | No        | Up to date      | 1.4 MB/s    |
|    4 | http://repos.forethought.net/ubuntu   | Yes        | No        | Up to date      | 1.35 MB/s   |
|    5 | http://repo.miserver.it.umich.edu/... | Yes        | No        | Up to date      | 937.62 KB/s |
...
|   75 | http://mirror.cc.vt.edu/pub2/ubuntu   | Yes        | No        | 1 day behind    | 659.67 KB/s |
|   76 | http://mirror.atlantic.net/ubuntu     | Yes        | No        | 2 days behind   | 351.26 KB/s |
|   77 | http://mirror.lstn.net/ubuntu         | Yes        | No        | 4 days behind   | 806.81 KB/s |
|   78 | http://mirrors.usinternet.com/ubun... | Yes        | No        | 4 weeks behind  | 514.31 KB/s |
|   79 | http://mirrors.arpnetworks.com/Ubuntu | Yes        | No        | 19 weeks behind | 418.94 KB/s |
|   80 | http://mirrors.ocf.berkeley.edu/ub... | Yes        | Yes       | Up to date      | 446.07 KB/s |
---------------------------------------------------------------------------------------------------------
Full URLs which are too long to be shown in above table:
1: http://mirrors.gigenet.com/ubuntuarchive
2: http://mirror.genesisadaptive.com/ubuntu
3: http://ubuntu.mirrors.tds.net/pub/ubuntu
5: http://repo.miserver.it.umich.edu/ubuntu
...
78: http://mirrors.usinternet.com/ubuntu/archive
80: http://mirrors.ocf.berkeley.edu/ubuntu