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

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

# "Hosts preparation":#hosts_preparation
## "Hosts setup using terraform (experimental)":#hosts_setup_using_terraform
## "Create a compute image":#create_a_compute_image
# "Multi host install using the provision.sh script":#multi_host
# "Choose the desired configuration":#choose_configuration
## "Multiple hosts / multiple hostnames":#multi_host_multi_hostnames
## "Further customization of the installation (modifying the salt pillars and states)":#further_customization
# "Installation order":#installation_order
# "Run the provision.sh script":#run_provision_script
# "Initial user and login":#initial_user
# "Test the installed cluster running a simple workflow":#test_install

h2(#hosts_preparation). Hosts preparation

In order to run Arvados on a multi-host installation, there are a few requirements that your infrastructure has to fulfill.

These instructions explain how to setup a multi-host environment that is suitable for production use of Arvados.

We suggest distributing the Arvados components in the following way, creating at least 6 hosts:

# Database server:
## postgresql server
# API node:
## arvados api server
## arvados controller
## arvados websocket
## arvados cloud dispatcher
# WORKBENCH node:
## arvados workbench
## arvados workbench2
# KEEPPROXY node:
## arvados keepproxy
## arvados keepweb
# KEEPSTOREs (at least 2)
## arvados keepstore
# SHELL node (optional):
## arvados shell

Note that these hosts can be virtual machines in your infrastructure and they don't need to be physical machines.

h3(#hosts_setup_using_terraform). Hosts setup using terraform (experimental)

We added a few "terraform":https://terraform.io/ scripts (https://github.com/arvados/arvados/tree/master/tools/terraform) to let you create these instances easier.
Check "the Arvados terraform documentation":/doc/install/terraform.html for more details.

h2(#multi_host). Multi host install using the provision.sh script

This is a package-based installation method. The Salt scripts are available from the "tools/salt-install":https://github.com/arvados/arvados/tree/master/tools/salt-install directory in the Arvados git repository.

This procedure will install all the main Arvados components to get you up and running in a multi host environment.

We suggest you to use the @provision.sh@ script to deploy Arvados, which is implemented with the @arvados-formula@ in a Saltstack master-less setup. After setting up a few variables in a config file (next step), you'll be ready to run it and get Arvados deployed.

h3(#create_a_compute_image). Create a compute image

In a multi-host installation, containers are dispatched in docker daemons running in the <i>compute instances</i>, which need some special setup. We provide a "compute image builder script":https://github.com/arvados/arvados/tree/master/tools/compute-images that you can use to build a template image following "these instructions":https://doc.arvados.org/main/install/crunch2-cloud/install-compute-node.html . Once you have that image created, you can use the image reference in the Arvados configuration in the next steps.

h2(#choose_configuration). Choose the desired configuration

For documentation's sake, we will use the cluster name <i>arva2</i> and the domain <i>arv.local</i>. If you don't change them as required in the next steps, installation won't proceed.

We will try to provide a few Arvados' multi host installation configurations examples for different infrastructure providers. Currently only AWS is available but they can be used with almost any provider with little changes.

You need to copy one of the example configuration files and directory, and edit them to suit your needs.

h3(#multi_host_multi_hostnames). Multiple hosts / multiple hostnames
<notextile>
<pre><code>cp local.params.example.multiple_hosts local.params
cp -r config_examples/multi_host/aws local_config_dir
</code></pre>
</notextile>

Edit the variables in the <i>local.params</i> file. Pay attention to the <b>*_INT_IP, *_TOKEN</b> and <b>*KEY</b> variables. Those variables will be used to do a search and replace on the <i>pillars/*</i> in place of any matching __VARIABLE__.

The <i>multi_host</i> include LetsEncrypt salt code to automatically request and install the certificates for the public-facing hosts (API, Workbench) so it will need the hostnames to be reachable from the Internet. If this cluster will not be the case, please set the variable <i>USE_LETSENCRYPT=no</i>.

h3(#further_customization). Further customization of the installation (modifying the salt pillars and states)

You will need further customization to suit your environment, which can be done editing the Saltstack pillars and states files. Pay particular attention to the <i>pillars/arvados.sls</i> file, where you will need to provide some information that can be retrieved as output of the terraform run.

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 hosts.

h2(#installation_order). Installation order

A few Arvados nodes need to be installed in certain order. The required order is

#. Database
#. API server
#. The other nodes can be installed in any order after the two above

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

When you finished customizing the configuration, you are ready to copy the files to the hosts and run the @provision.sh@ script. The script allows you to specify the <i>role/s</i> a node will have and it will install only the Arvados components required for such role. The general format of the command is:

<notextile>
<pre><code>scp -r provision.sh local* user@host:
ssh user@host sudo ./provision.sh --roles comma,separated,list,of,roles,to,apply
</code></pre>
</notextile>

and wait for it to finish.

If everything goes OK, you'll get some final lines stating something like:

<notextile>
<pre><code>arvados: Succeeded: 109 (changed=9)
arvados: Failed:      0
</code></pre>
</notextile>

The distribution of role as described above can be applied running these commands:

#. Database
<notextile>
<pre><code>scp -r provision.sh local* user@host:
ssh user@host sudo ./provision.sh --config local.params --roles database
</code></pre>
</notextile>

#. API
<notextile>
<pre><code>scp -r provision.sh local* user@host:
ssh user@host sudo ./provision.sh --config local.params --roles api,controller,websocket,dispatcher
</code></pre>
</notextile>

#. Keepstore/s
<notextile>
<pre><code>scp -r provision.sh local* user@host:
ssh user@host sudo ./provision.sh --config local.params --roles keepstore
</code></pre>
</notextile>

#. Workbench
<notextile>
<pre><code>scp -r provision.sh local* user@host:
ssh user@host sudo ./provision.sh --config local.params --roles workbench,workbench2
</code></pre>
</notextile>

#. Keepproxy / Keepweb
<notextile>
<pre><code>scp -r provision.sh local* user@host:
ssh user@host sudo ./provision.sh --config local.params --roles keepproxy,keepweb
</code></pre>
</notextile>

#. Shell (here we copy the CLI test workflow too)
<notextile>
<pre><code>scp -r provision.sh local* tests user@host:
ssh user@host sudo ./provision.sh --config local.params --roles shell
</code></pre>
</notextile>

h2(#initial_user). Initial user and login 

At this point you should be able to log into the Arvados cluster. The initial URL will be:

* https://workbench.arva2.arv.local

or, in general, the url format will be:

* https://workbench.@<cluster>.<domain>@

By default, the provision script creates an initial user for testing purposes. This user is configured as administrator of the newly created cluster.

Assuming you didn't change these values in the @local.params@ file, the initial credentials are:

* User: 'admin'
* Password: 'password'
* Email: 'admin@arva2.arv.local'

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

If you followed the instructions above, the @provision.sh@ script saves a simple example test workflow in the @/tmp/cluster_tests@ directory in the @shell@ 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",
 ...
}
Uploading arvados/jobs' docker image to the project
2.1.1: Pulling from arvados/jobs
8559a31e96f4: Pulling fs layer
...
Status: Downloaded newer image for arvados/jobs:2.1.1
docker.io/arvados/jobs:2.1.1
2020-11-23 21:43:39 arvados.arv_put[32678] INFO: Creating new cache file at /home/vagrant/.cache/arvados/arv-put/c59256eda1829281424c80f588c7cc4d
2020-11-23 21:43:46 arvados.arv_put[32678] INFO: Collection saved as 'Docker image arvados jobs:2.1.1 sha256:0dd50'
arva2-4zz18-1u5pvbld7cvxuy2
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>