Glance & Its Installation | OpenStack's Image Service - Flux7 Blog

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This tutorial is on OpenStack’s Image Service Glance – its components and step-by-step guide to install and use Glance.

Introduction

The OpenStack Image Service called Glance provides discovery, registration and delivery services for disk and server images.

It has the ability to copy (or snapshot) a server image and then to store it promptly. Stored images then can be used as templates to get new servers up and running quickly, and can also be used to store and catalog unlimited backups.

Virtual-machine images can be stored in various locations, including simple filesystems and object-storage systems such as OpenStack Object Storage (code named Swift).

Glance includes the following components:

• Glance-api: Accepts Image API calls for image discovery, retrieval and storage.
• Glance-registry: Stores, processes, and retrieves metadata for images. Metadata includes size, type and so on.
• Database: Stores image metadata and supports many backends, including MySQL, SQlite and mongodb.
• Storage repository: Supports normal file systems, RADOS block devices, Amazon S3 and HTTP for image storage.

Installing Glance

a. Install Glance services.

<i>#apt-get install glance python-glanceclient</i>

<i>#mysql</i>

<i>&gt; create database glance;</i>

<i>&gt; grant all privileges on glance.* to glanceUser@localhost identified by ‘StrongPass’;</i>

<i>&gt; grant all privileges on keystone.* to glanceUser@'%' identified by ‘StrongPass’;</i>

<i># keystone user-create --name=glance --pass=90b68569e6da --email=glance@flux7.com</i>

<i># keystone user-role-add --user=glance --tenant=service --role=admin </i>

<i># keystone service-create --name=glance --type=image --description="Glance Image Service"</i>

<i># keystone endpoint-create --service-id=a3f9c625a3b9443f8e66bf4e5de2349f --publicurl=</i><a href="http://controller:9292/"><i>http://192.168.100.10:9292</i></a><i> --internalurl=http://192.168.100.10:9292--adminurl=http://192.168.100.10:9292</i>

<i>sql_connection = mysql://glanceUser:StrongPass@localhost/glance</i>

<i>[keystone_authtoken]</i>

<i>auth_uri = http://192.168.100.10:5000</i>

<i>auth_host = 192.168.100.10</i>

<i>auth_port = 35357</i>

<i>auth_protocol = http</i>

<i>admin_tenant_name = service</i>

<i>admin_user = glance</i>

<i>admin_password = 90b68569e6da</i>

<i>[paste_deploy]</i>

<i>…</i>

<i>flavor = keystone</i>

<i>[filter:authtoken]</i>

<i>paste.filter_factory=keystoneclient.middleware.auth_token:filter_factory</i>

<i>auth_host=192.168.100.10</i>

<i>admin_user=glance</i>

<i>admin_tenant_name=service</i>

<i>admin_password=90b68569e6da</i>

<i># service glance-registry restart</i>

<i># service glance-api restart</i>