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Attach a public network to a running VM

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Objective

In this exercise we will show how to use jOCCI APIs to look for network resources and attach them to computing resource.

Introduction

Let's suppose to have a running Jyputer Notebook at BIFI with the following VM ID: http://server4-eupt.unizar.es:8787/compute/d380e2a1-0f69-4cf7-8781-1b784a403eed

If you check the VM metadata with the jOCCI-describe-resource, you will find out that this VM has a private network IP address (192.168.68.19). This mean that the server is running behind a NAT server and we need to attach a public network before to access it.

To check the public network interface published by the given cloud provider, please consider the jOCCI-list-resource project:

Listing network resources

Usage

  • Access the maven project
]$ cd di4r-traning/jOCCI-list-resources/
  • Edit your settings in the src/main/java/it/infn/ct/Exercise2.java source code to list network resources:
String OCCI_ENDPOINT_HOST = "http://server4-eupt.unizar.es:8787/";
// Possible resources are = os_tpl, resource_tpl, compute, storage and network
List<String> RESOURCE = Arrays.asList("network");
  • Compile and package with maven:
 ]$ mvn compile && mvn package
 [INFO] Scanning for projects...
 [INFO]                                                                         
 [INFO] ------------------------------------------------------------------------
 [INFO] Building jocci-list-resource 1.0
 [INFO] ------------------------------------------------------------------------
 [..]
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD SUCCESS
 [INFO] ------------------------------------------------------------------------
 [INFO] Total time: 06.10s
 [INFO] Finished at: Mon Oct 03 16:57:52 CEST 2016
 [INFO] Final Memory: 10M/30M
 [INFO] ------------------------------------------------------------------------
  • Listing network resources available (you may redirect the output to a file):
]$ java -jar target/jocci-list-resources-1.0-jar-with-dependencies.jar
[ACTION] = list
AUTH = x509
OCCI_ENDPOINT_HOST = http://server4-eupt.unizar.es:8787/
RESOURCE = [network]
TRUSTED_CERT_REPOSITORY_PATH = /etc/grid-security/certificates
PROXY_PATH = /tmp/x509up_u1000
Verbose = ON 
[+] Listing *network* resources
http://server4-eupt.unizar.es:8787/network/admin
http://server4-eupt.unizar.es:8787/network/public