Commit bec1b505 authored by Georgios Ouzounis's avatar Georgios Ouzounis
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Changes on Lambda Instance guides' texts.

parent f9e8ebc0
<h3>Lambda Instance Creation</h3>
<p>After creating a LoD service VM, one can create a Lambda Instance through the control panel of the service VM. The images below will guide you step by step in the creation of your first Lambda Instance.</p>
<p>This guide assumes you already have a LoD service VM up and running. If not, read {{#link-to 'index'}}this{{/link-to}}. You can create a Lambda Instance through the control panel of the service VM. The images below will guide you step by step in the creation of your first Lambda Instance.</p>
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<li>Login the service dashboard using your ~okeanos token(you can find your ~okeanos token <a href="https://accounts.okeanos.grnet.gr/ui/api_access">here</a>)</li>
<li>Select Instances from the upper left menu of options</li>
<li>On the main window select the button "Create New Instance"</li>
<li>Fill your Lambda Instance specification in the form provided and click "Submit" when ready</li>
<li>Note the status of your new Lambda Instance is updated while it is being deployed and configured</li>
<li>Fill in your new Lambda Instance details in the form provided and click "Submit" when ready (all fields marked with * are mandatory)</li>
<li>Note the status of your new Lambda Instance is automatically updated while it is being deployed and configured</li>
</ol>
<p><strong>At the end your Lambda Instance will be ready to use. </strong></p>
<p>If something goes wrong you will be informed with an error message.</p>
<p>On the <a href="https://cyclades.okeanos.grnet.gr/ui/">Cyclades web interface</a> of the ~okeanos service you should now be able to see the new VMs that have been utilized for the Lambda on Demand Service.</p>
<p>You should now be able to see the new VMs that have been utilized for the Lambda on Demand Service <a href="https://cyclades.okeanos.grnet.gr/ui/">from the Cyclades web interface on ~okeanos.</a></p>
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<div class="pad"> Follow the steps described in this section to create your lambda instance.
<div class="pad"> Follow the steps below to create your lambda instance.
</div>
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<h1>Master Node Hostname</h1>
<p>
Every Lambda Instance has a single Master Node. The Master Node is the only
VM from those that comprise the Lambda Instance that has a public IP and is thus accessible through the internet. You can follow the steps described bellow to find the hostname of this VM.
Every Lambda Instance has a single Master Node. The Master Node is the only VM that has a public IP and is thus accessible through the internet. You can follow the steps described bellow to find the hostname of this VM.
</p>
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</li>
<li>
On the list of properties that are desplayed, the fourth one, namely "Hostname of master node" is the hostname of the Master Node of your Lambda Instance.
On the list of properties that are displayed, the fourth one, namely "Hostname of master node" is the hostname of the Master Node of your Lambda Instance.
</li>
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<h1>Apache Kafka topics</h1>
<p>
Apache Kafka is the data ingestion layer used by a Lambda Instance. It maintains feeds of messages in categories called topics. Each topic has its own name and can be used either to write or read data from it. Upon creation of a Lambda Instance, you can specify the names of the Kafka topics you want to be created. If no name is provided, then three topics will be created, named "input", "stream-output" and "batch-output". The topics created on a Lambda Instance are categorized to "input" and "output" topics. All the data sent to an input topic, will be automatically saved on the immutable dataset of the Lambda Instance.<br>
Apache Kafka is the data ingestion layer used by a Lambda Instance. It maintains feeds of messages in categories called topics. Each topic has its own name and can be used either to write or read data from it. Upon creation of a Lambda Instance, you can specify the names of the Kafka topics you want to be created. If no name is provided, then three topics will be created, named "input", "stream-output" and "batch-output". The topics created on a Lambda Instance are categorized to "input" and "output" topics. All the data sent to an input topic, will be automatically appended to the master dataset of the Lambda Instance.<br>
To get more information about Apache Kafka, you can visit <a href="https://kafka.apache.org">kafka.apache.org</a>
</p>
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<div class="pad"> Follow the steps described in this section to start/stop your lambda instances.
<div class="pad"> Follow the steps below to start/stop your lambda instances.
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<h1>Start-Stop Lambda Instance</h1>
<p>
As soon as a Lambda Instance is created, it gets started. This means that it is ready to accept and execute your Applications.
A Lambda Instance starts automatically after it has been created. This means that it is ready to accept and execute your Applications.
You have the ability to Stop and then Start again a Lambda Instance. To do that, follow the guide below.
</p>
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<ol>
<li>
Log in the LoD Service VM using your ~okeanos token.
Log into the LoD Service VM using your <a href="https://accounts.okeanos.grnet.gr/ui/api_access">~okeanos token</a>.
</li>
<li>
From the sidebar, select "Instances".
</li>
<li>
On the list of Lambda Instances that appear, choose the corresponding "Start" or "Stop" button. Notice that when the Lambda Instance
is started the "Start" button is disabled and when the Lambda Instance is stopped the "Stop" button is disabled.
From the list of Lambda Instances that appear, choose the corresponding "Start" or "Stop" button. Notice that when the Lambda Instance
has been started, the "Start" button is disabled and when the Lambda Instance has been, stopped the "Stop" button is disabled.
</li>
</ol>
<h1>
Notes and Advisories
Notes
</h1>
<p>
Note that it takes some time to start and stop a Lambda Instance. Moreover, after a Lambda Instance is started, there is a small time interval
until Apache Flink is ready to execute your Applications.
Note that it takes some time to start and stop a Lambda Instance. Moreover, after a Lambda Instance is started, Apache Flink might take some minutes before it is ready to execute your Applications.
</p>
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