Add troubleshooting section to the docker documentation.

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diff --git a/docker/troubleshooting.md b/docker/troubleshooting.md
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+# Troubleshooting
+
+This is to troubleshoot https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/245
+But it might contain useful commands for other cases as well.
+
+The configuration to add the postgres log in vim is:
+postgresql['log_directory'] = '/var/log/gitlab/postgresql.log'
+
+# Commands
+
+sudo docker rm -f gitlab
+sudo docker rm -f gitlab_data
+
+sudo docker build --tag gitlab_image docker/
+sudo docker run --name gitlab_data gitlab_image /bin/true
+
+sudo docker run -ti --rm --volumes-from gitlab_data ubuntu apt-get install -y vim; sudo vi /etc/gitlab/gitlab.rb
+
+sudo docker run --detach --name gitlab --publish 8080:80 --publish 2222:22 --volumes-from gitlab_data gitlab_image
+
+sudo docker run -t --rm --volumes-from gitlab_data ubuntu tail -f /var/log/gitlab/reconfigure.log
+
+sudo docker run -t --rm --volumes-from gitlab_data ubuntu cat /var/log/gitlab/postgresql.log