diff --git a/Gemfile.lock b/Gemfile.lock
index 527a91fe..18067c27 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,8 +96,8 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
-    concurrent-ruby (1.0.0)
-    concurrent-ruby (1.0.0-java)
+    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.0.2-java)
     concurrent-ruby-ext (1.0.0)
       concurrent-ruby (~> 1.0.0)
     d3-rails (3.5.11)
diff --git a/codeocean-dockerconfig.md b/codeocean-dockerconfig.md
new file mode 100644
index 00000000..84331a8a
--- /dev/null
+++ b/codeocean-dockerconfig.md
@@ -0,0 +1,11 @@
+In order to make containers accessible for codeocean, they need to be reachable via tcp.
+For this, the docker daemon has to be started with the following options:
+
+DOCKER_OPTS='-H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock --iptables=false'
+
+This binds the daemon to the specified socket (for access via the command line on the machine) as well as the specified tcp url.
+Either pass these options to the starting call, or specify them in the docker config file.
+
+In Ubuntu, this file is located under: /ect/default/docker
+
+In Debian, please refer to the RHEL and CentOS part under that link: https://docs.docker.com/engine/admin/#/configuring-docker-1