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Clarify role of `dockerhost` variable

Signed-off-by: Alex Coventry <alx@empirical.com>

Alex Coventry authored on 2016/06/20 04:28:08
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@@ -54,7 +54,10 @@ use:
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     $ docker logs -f test_apt_cacher_ng
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-To get your Debian-based containers to use the proxy, you have following options
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+To get your Debian-based containers to use the proxy, you have
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+following options.  Note that you must replace `dockerhost` with the
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+IP address or FQDN of the host running the `test_apt_cacher_ng`
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+container.
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 1. Add an apt Proxy setting
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    `echo 'Acquire::http { Proxy "http://dockerhost:3142"; };' >> /etc/apt/conf.d/01proxy`