+Using the default configuration, this installation method has a number of limitations:
+
+* all services run on the same machine, and they will compete for resources.
+* it uses the local machine disk for Keep storage (under the @/tmp@ directory).
+* it installs the @crunch-dispatch-local@ dispatcher, which can run just one concurrent CWL job. This job will be executed on the machine that runs all the Arvados services. Most workflows require at least two concurrent CWL jobs, one for the workflow runner, and one for the payload.
+
+It is possible to start with the single host installation method and modify the Arvados configuration file later to address these limitations. E.g. switch to a "different storage volume setup":{{site.baseurl}}/install/configure-s3-object-storage.html for Keep, and switch to "the cloud dispatcher":{{site.baseurl}}/install/crunch2-cloud/install-dispatch-cloud.html to provision compute resources dynamically.
+
+h2(#prerequisites). Prerequisites and planning
+
+Arvados requires SSL for (almost) all network traffic. This installation method supports the following options for the required SSL certificate(s): @self-signed@ and @bring your own certificates@.