diff -r f15f00b6a8a9 -r 79c7422f579b README
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+++ b/README	Tue Apr 07 14:28:51 2015 +0200
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+548
+
+== Build the images
+
+    ./build
+
+You may want to unset the http_proxy environment variable. (At least for
+me the =docker= commands didn't work when this env was set.)
+
+To build the Fedora image, docker needs BTRFS storage. (Fedora uses
+Linux capabilities.) Just add "-s btrfs" to the DOCKER_OPTS in
+=/etc/default/docker=.
+
+This command should create some docker images, called
+=eximtest/<system>=.
+
+== Run the tests
+
+    docker run -i -t -h foo.site eximtest/<system>
+
+Any options you pass are sent directly to the =runtest= script
+inside the image.