+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. This includes any compute jobs.
+* it uses the local machine disk for Keep storage (under the @/tmp@ directory). There may not be a lot of space available.
+* it installs the @crunch-dispatch-local@ dispatcher, which can run just eight concurrent CWL jobs. These jobs will be executed on the same machine that runs all the Arvados services and may well starve them of resources.
+
+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@.