---
layout: default
navsection: installguide
title: Single host Arvados
...
{% comment %}
Copyright (C) The Arvados Authors. All rights reserved.

SPDX-License-Identifier: CC-BY-SA-3.0
{% endcomment %}

# "Limitations of the single host install":#limitations
# "Prerequisites":#prerequisites
# "Download the installer":#download
# "Copy the configuration files":#copy_config
# "Choose the SSL configuration":#certificates
## "Using a self-signed certificate":#self-signed
## "Using a Let's Encrypt certificate":#lets-encrypt
## "Bring your own certificate":#bring-your-own
# "Further customization of the installation (modifying the salt pillars and states)":#further_customization
# "Run the provision.sh script":#run_provision_script
# "Install the CA root certificate":#ca_root_certificate
# "Initial user and login":#initial_user
# "Test the installed cluster running a simple workflow":#test_install
# "After the installation":#post_install

h2(#limitations). Limitations of the single host install

<b>NOTE: The single host installation is a good choice for evaluating Arvados, but it is not recommended for production use.</b>

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

* git
* a dedicated (virtual) machine for your Arvados server with at least 2 cores and 8 GiB of RAM, running a "supported Arvados distribution":{{site.baseurl}}/install/install-manual-prerequisites.html#supportedlinux
* a DNS hostname that resolves to the IP address of your Arvados server
* ports 443, 8800-8805 need to be reachable from your client (configurable in @local.params@, see below)
* port 80 needs to be reachable from everywhere on the internet (only when using "Let's Encrypt":#lets-encrypt)
* an SSL certificate matching the hostname in use (only when using "bring your own certificate":#bring-your-own)

h2(#download). Download the installer

{% include 'download_installer' %}

h2(#copy_config). Copy the configuration files

<notextile>
<pre><code>cp local.params.example.single_host_single_hostname local.params
cp -r config_examples/single_host/single_hostname local_config_dir
</code></pre>
</notextile>

Edit the variables in the <i>local.params</i> file. Pay attention to the <notextile><b>*_PORT, *_TOKEN</b> and <b>*_KEY</b></notextile> variables. The *SSL_MODE* variable is discussed in the next section.

{% include 'ssl_config' %}

h2(#further_customization). Further customization of the installation (modifying the salt pillars and states)

If you want or need further customization, you can edit the Saltstack pillars and states files. Pay particular attention to the <i>pillars/arvados.sls</i> one. Any extra <i>state</i> file you add under <i>local_config_dir/states</i> will be added to the salt run and applied to the host.

h2(#run_provision_script). Run the provision.sh script

When you finished customizing the configuration, you are ready to copy the files to the host (if needed) and run the @provision.sh@ script:

<notextile>
<pre><code>scp -r provision.sh local* tests user@host:
ssh user@host sudo ./provision.sh
</code></pre>
</notextile>

and wait for it to finish. The script will need 5 to 10 minutes to install and configure everything.

If everything goes OK, you'll get final output that looks similar to this:

<notextile>
<pre><code>arvados: Succeeded: 151 (changed=36)
arvados: Failed:      0
</code></pre>
</notextile>

{% include 'install_ca_cert' %}

h2(#initial_user). Initial user and login

At this point you should be able to log on to your new Arvados cluster. The workbench URL will be

* https://@HOSTNAME_EXT@

By default, the provision script creates an initial user for testing purposes. This user is configured as administrator of the newly created cluster. The username, password and e-mail address for the initial user are configured in the @local.params@ file. Log in with the e-mail address and password.

h2(#test_install). Test the installed cluster running a simple workflow

The @provision.sh@ script saves a simple example test workflow in the @/tmp/cluster_tests@ directory in the node. If you want to run it, just ssh to the node, change to that directory and run:

<notextile>
<pre><code>cd /tmp/cluster_tests
sudo ./run-test.sh
</code></pre>
</notextile>

It will create a test user (by default, the same one as the admin user), upload a small workflow and run it. If everything goes OK, the output should similar to this (some output was shortened for clarity):

<notextile>
<pre><code>Creating Arvados Standard Docker Images project
Arvados project uuid is 'arva2-j7d0g-0prd8cjlk6kfl7y'
{
 ...
 "uuid":"arva2-o0j2j-n4zu4cak5iifq2a",
 "owner_uuid":"arva2-tpzed-000000000000000",
 ...
}
Creating initial user ('admin')
Setting up user ('admin')
{
 "items":[
  {
   ...
   "owner_uuid":"arva2-tpzed-000000000000000",
   ...
   "uuid":"arva2-o0j2j-1ownrdne0ok9iox"
  },
  {
   ...
   "owner_uuid":"arva2-tpzed-000000000000000",
   ...
   "uuid":"arva2-o0j2j-1zbeyhcwxc1tvb7"
  },
  {
   ...
   "email":"admin@arva2.arv.local",
   ...
   "owner_uuid":"arva2-tpzed-000000000000000",
   ...
   "username":"admin",
   "uuid":"arva2-tpzed-3wrm93zmzpshrq2",
   ...
  }
 ],
 "kind":"arvados#HashList"
}
Activating user 'admin'
{
 ...
 "email":"admin@arva2.arv.local",
 ...
 "username":"admin",
 "uuid":"arva2-tpzed-3wrm93zmzpshrq2",
 ...
}
Running test CWL workflow
INFO /usr/bin/cwl-runner 2.1.1, arvados-python-client 2.1.1, cwltool 3.0.20200807132242
INFO Resolved 'hasher-workflow.cwl' to 'file:///tmp/cluster_tests/hasher-workflow.cwl'
...
INFO Using cluster arva2 (https://arva2.arv.local:8443/)
INFO Upload local files: "test.txt"
INFO Uploaded to ea34d971b71d5536b4f6b7d6c69dc7f6+50 (arva2-4zz18-c8uvwqdry4r8jao)
INFO Using collection cache size 256 MiB
INFO [container hasher-workflow.cwl] submitted container_request arva2-xvhdp-v1bkywd58gyocwm
INFO [container hasher-workflow.cwl] arva2-xvhdp-v1bkywd58gyocwm is Final
INFO Overall process status is success
INFO Final output collection d6c69a88147dde9d52a418d50ef788df+123
{
    "hasher_out": {
        "basename": "hasher3.md5sum.txt",
        "class": "File",
        "location": "keep:d6c69a88147dde9d52a418d50ef788df+123/hasher3.md5sum.txt",
        "size": 95
    }
}
INFO Final process status is success
</code></pre>
</notextile>

h2(#post_install). After the installation

Once the installation is complete, it is recommended to keep a copy of your local configuration files. Committing them to version control is a good idea.

Re-running the Salt-based installer is not recommended for maintaining and upgrading Arvados, please see "Maintenance and upgrading":{{site.baseurl}}/admin/maintenance-and-upgrading.html for more information.