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layout: default
navsection: installguide
title: Install the cloud dispatcher
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{% comment %}
Copyright (C) The Arvados Authors. All rights reserved.
SPDX-License-Identifier: CC-BY-SA-3.0
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{% include 'notebox_begin_warning' %}
arvados-dispatch-cloud is only relevant for cloud installations. Skip this section if you are installing a on premise cluster that will spool jobs to Slurm.
{% include 'notebox_end' %}
# "Introduction":#introduction
# "Create compute node VM image":#create-image
# "Update config.yml":#update-config
# "Install arvados-dispatch-cloud":#install-packages
# "Start the service":#start-service
# "Restart the API server and controller":#restart-api
# "Confirm working installation":#confirm-working
h2(#introduction). Introduction
The cloud dispatch service is for running containers on cloud VMs. It works with Microsoft Azure and Amazon EC2; future versions will also support Google Compute Engine.
The cloud dispatch service can run on any node that can connect to the Arvados API service, the cloud provider's API, and the SSH service on cloud VMs. It is not resource-intensive, so you can run it on the API server node.
h2(#create-image). Create compute node VM image and configure resolver
Set up a VM following the steps "to set up a compute node":crunch2-slurm/install-compute-node.html
Compute nodes must be able to resolve the hostnames of the API server and any keepstore servers to your internal IP addresses. You can do this by running an internal DNS resolver and configuring the compute VMs to use that resolver, or by hardcoding the services in the @/etc/hosts@ file. For example:
<notextile><pre><code>10.20.30.40 <span class="userinput">ClusterID.example.com</span>
10.20.30.41 <span class="userinput">keep1.ClusterID.example.com</span>
10.20.30.42 <span class="userinput">keep2.ClusterID.example.com</span>
</code></pre></notextile>
Once the VM is fully configured, create a reusable VM image from it and make note of the image id.
h2(#update-config). Update config.yml
h3. Create a private key
Generate an SSH private key with no passphrase. Save it in the cluster configuration file (see @PrivateKey@ in the example below).
<notextile>
<pre><code>~$ <span class="userinput">ssh-keygen -N '' -f ~/.ssh/id_dispatcher</span>
Generating public/private rsa key pair.
Your identification has been saved in /home/user/.ssh/id_dispatcher.
Your public key has been saved in /home/user/.ssh/id_dispatcher.pub.
The key fingerprint is:
[...]
~$ <span class="userinput">cat ~/.ssh/id_dispatcher</span>
-----BEGIN RSA PRIVATE KEY-----
MIIEpQIBAAKCAQEAqXoCzcOBkFQ7w4dvXf9B++1ctgZRqEbgRYL3SstuMV4oawks
ttUuxJycDdsPmeYcHsKo8vsEZpN6iYsX6ZZzhkO5nEayUTU8sBjmg1ZCTo4QqKXr
...
oFyAjVoexx0RBcH6BveTfQtJKbktP1qBO4mXo2dP0cacuZEtlAqW9Eb06Pvaw/D9
foktmqOY8MyctzFgXBpGTxPliGjqo8OkrOyQP2g+FL7v+Km31Xs61P8=
-----END RSA PRIVATE KEY-----
</code></pre>
</notextile>
You can delete the key files after you have copied the private key to your configuration file.
<notextile>
<pre><code>~$ <span class="userinput">rm ~/.ssh/id_dispatcher ~/.ssh/id_dispatcher.pub</span>
</code></pre>
</notextile>
h3. Configure CloudVMs
Add or update the following portions of your cluster configuration file, @config.yml@. Refer to "config.defaults.yml":{{site.baseurl}}/admin/config.html for information about additional configuration options.
<notextile>
<pre><code> Services:
DispatchCloud:
InternalURLs:
"http://localhost:9006": {}
Containers:
CloudVMs:
# BootProbeCommand is a shell command that succeeds when an instance is ready for service
BootProbeCommand: "sudo systemctl status docker"
<b># --- driver-specific configuration goes here --- see Amazon and Azure examples below ---</b>
DispatchPrivateKey: |
-----BEGIN RSA PRIVATE KEY-----
MIIEpQIBAAKCAQEAqXoCzcOBkFQ7w4dvXf9B++1ctgZRqEbgRYL3SstuMV4oawks
ttUuxJycDdsPmeYcHsKo8vsEZpN6iYsX6ZZzhkO5nEayUTU8sBjmg1ZCTo4QqKXr
FJ+amZ7oYMDof6QEdwl6KNDfIddL+NfBCLQTVInOAaNss7GRrxLTuTV7HcRaIUUI
jYg0Ibg8ZZTzQxCvFXXnjseTgmOcTv7CuuGdt91OVdoq8czG/w8TwOhymEb7mQlt
lXuucwQvYgfoUgcnTgpJr7j+hafp75g2wlPozp8gJ6WQ2yBWcfqL2aw7m7Ll88Nd
[...]
oFyAjVoexx0RBcH6BveTfQtJKbktP1qBO4mXo2dP0cacuZEtlAqW9Eb06Pvaw/D9
foktmqOY8MyctzFgXBpGTxPliGjqo8OkrOyQP2g+FL7v+Km31Xs61P8=
-----END RSA PRIVATE KEY-----
InstanceTypes:
x1md:
ProviderType: x1.medium
VCPUs: 8
RAM: 64GiB
IncludedScratch: 64GB
Price: 0.62
x1lg:
ProviderType: x1.large
VCPUs: 16
RAM: 128GiB
IncludedScratch: 128GB
Price: 1.23
</code></pre>
</notextile>
h4. Minimal configuration example for Amazon EC2
<notextile>
<pre><code> Containers:
CloudVMs:
ImageID: ami-01234567890abcdef
Driver: ec2
DriverParameters:
AccessKeyID: XXXXXXXXXXXXXXXXXXXX
SecretAccessKey: YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
SecurityGroupIDs:
- sg-0123abcd
SubnetID: subnet-0123abcd
Region: us-east-1
EBSVolumeType: gp2
AdminUsername: arvados
</code></pre>
</notextile>
h4. Minimal configuration example for Azure
<notextile>
<pre><code> Containers:
CloudVMs:
ImageID: "https://zzzzzzzz.blob.core.windows.net/system/Microsoft.Compute/Images/images/zzzzz-compute-osDisk.55555555-5555-5555-5555-555555555555.vhd"
Driver: azure
DriverParameters:
SubscriptionID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
ClientID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
ClientSecret: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
TenantID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
CloudEnvironment: AzurePublicCloud
ResourceGroup: zzzzz
Location: centralus
Network: zzzzz
Subnet: zzzzz-subnet-private
StorageAccount: example
BlobContainer: vhds
DeleteDanglingResourcesAfter: 20s
AdminUsername: arvados
</code></pre>
</notextile>
Get the @SubscriptionID@ and @TenantID@:
<pre>
$ az account list
[
{
"cloudName": "AzureCloud",
"id": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXX",
"isDefault": true,
"name": "Your Subscription",
"state": "Enabled",
"tenantId": "YYYYYYYY-YYYY-YYYY-YYYYYYYY",
"user": {
"name": "you@example.com",
"type": "user"
}
}
]
</pre>
You will need to create a "service principal" to use as a delegated authority for API access.
<notextile><pre><code>$ az ad app create --display-name "Arvados Dispatch Cloud (<span class="userinput">ClusterID</span>)" --homepage "https://arvados.org" --identifier-uris "https://<span class="userinput">ClusterID.example.com</span>" --end-date 2299-12-31 --password <span class="userinput">Your_Password</span>
$ az ad sp create "<span class="userinput">appId</span>"
(appId is part of the response of the previous command)
$ az role assignment create --assignee "<span class="userinput">objectId</span>" --role Owner --scope /subscriptions/{subscriptionId}/
(objectId is part of the response of the previous command)
</code></pre></notextile>
Now update your @config.yml@ file:
@ClientID@ is the 'appId' value.
@ClientSecret@ is what was provided as <span class="userinput">Your_Password</span>.
h3. Test your configuration
Run the @cloudtest@ tool to verify that your configuration works. This creates a new cloud VM, confirms that it boots correctly and accepts your configured SSH private key, and shuts it down.
<notextile>
<pre><code>~$ <span class="userinput">arvados-server cloudtest && echo "OK!"</span>
</code></pre>
</notextile>
Refer to the "cloudtest tool documentation":../admin/cloudtest.html for more information.
{% assign arvados_component = 'arvados-dispatch-cloud' %}
{% include 'install_packages' %}
{% include 'start_service' %}
{% include 'restart_api' %}
h2(#confirm-working). Confirm working installation
On the dispatch node, start monitoring the arvados-dispatch-cloud logs:
<notextile>
<pre><code>~$ <span class="userinput">sudo journalctl -o cat -fu arvados-dispatch-cloud.service</span>
</code></pre>
</notextile>
"Make sure to install the arvados/jobs image.":install-jobs-image.html
Submit a simple container request:
<notextile>
<pre><code>shell:~$ <span class="userinput">arv container_request create --container-request '{
"name": "test",
"state": "Committed",
"priority": 1,
"container_image": "arvados/jobs:latest",
"command": ["echo", "Hello, Crunch!"],
"output_path": "/out",
"mounts": {
"/out": {
"kind": "tmp",
"capacity": 1000
}
},
"runtime_constraints": {
"vcpus": 1,
"ram": 1048576
}
}'</span>
</code></pre>
</notextile>
This command should return a record with a @container_uuid@ field. Once @arvados-dispatch-cloud@ polls the API server for new containers to run, you should see it dispatch that same container.
The @arvados-dispatch-cloud@ API a list of queued and running jobs. For example:
<notextile>
<pre><code>~$ <span class="userinput">curl ...</span>
</code></pre>
</notextile>
When the container finishes, the dispatcher will log it.
After the container finishes, you can get the container record by UUID *from a shell server* to see its results:
<notextile>
<pre><code>shell:~$ <span class="userinput">arv get <b>zzzzz-dz642-hdp2vpu9nq14tx0</b></span>
{
...
"exit_code":0,
"log":"a01df2f7e5bc1c2ad59c60a837e90dc6+166",
"output":"d41d8cd98f00b204e9800998ecf8427e+0",
"state":"Complete",
...
}
</code></pre>
</notextile>
You can use standard Keep tools to view the container's output and logs from their corresponding fields. For example, to see the logs from the collection referenced in the @log@ field:
<notextile>
<pre><code>~$ <span class="userinput">arv keep ls <b>a01df2f7e5bc1c2ad59c60a837e90dc6+166</b></span>
./crunch-run.txt
./stderr.txt
./stdout.txt
~$ <span class="userinput">arv-get <b>a01df2f7e5bc1c2ad59c60a837e90dc6+166</b>/stdout.txt</span>
2016-08-05T13:53:06.201011Z Hello, Crunch!
</code></pre>
</notextile>
If the container does not dispatch successfully, refer to the @arvados-dispatch-cloud@ logs for information about why it failed.