Installing OpenStack Image Service_OpenStack Cloud Computing Cookbook（Third Edition）-QQ阅读男生玄幻网

书名：OpenStack Cloud Computing Cookbook（Third Edition）
作者名：Kevin Jackson Cody Bunch Egle Sigler
本章字数：689字
更新时间：2025-03-01 04:14:04

Installing OpenStack Image Service

Installation of the latest OpenStack Image Service is simply achieved by using the packages provided from the Ubuntu Cloud Archive repositories, which have been packaged for our Ubuntu 14.04 LTS GNU/Linux installation.

Getting ready

To begin with, ensure you're logged in to our OpenStack Controller host where OpenStack Image Service will be installed.

To log in to our OpenStack Controller host that was created using Vagrant, issue the following command:

vagrant ssh controller

Ensure that our Ubuntu 14.04 LTS release is using the Ubuntu Cloud Archive that has the packages required for the Juno release. For more information, visit http://bit.ly/OpenStackCookbookCloudArchive.

Tip

All of the steps can be found at http://www.openstackcookbook.com/.

We will configure Glance to use MariaDB as the database backend, so this needs to be installed prior to installing Glance.

Tip

If MariaDB is not installed, visit http://bit.ly/OpenStackCookbookInstallMariaDB for instructions on how to do this.

We will also need to have RabbitMQ installed as our message queue service, so this needs to also be installed prior to installing Glance.

Tip

If RabbitMQ is not installed, visit http://bit.ly/OpenStackCookbookInstallRabbitMQ for instructions on how to do this.

The instructions in this section assume the controller node has two IP addresses. It will have a front-facing IP address 192.168.100.200 and a backside IP address 172.16.0.200 (which is also the address of the MariaDB server). It has two addresses because the internal data will communicate over the backside IP address (for example, database traffic) and any Glance traffic will traverse the front.

How to do it...

Carry out the following steps to install OpenStack Image Service:

Installation of OpenStack Image Service is done by specifying the glance package in Ubuntu:
```
sudo apt-get update
sudo apt-get install ntp glance python-keyring
```
Once installed, we need to configure the backend database store, so we first create the glance database in MariaDB. We do this as follows:
```
MYSQL_ROOT_PASS=openstack
mysql -uroot -p$MYSQL_ROOT_PASS -e "CREATE DATABASE \
 glance;"
```
We have a user called root in MariaDB with the password openstack, which is able to create databases.

It is a good practice to create a user that is specific to our OpenStack Image service, so we create a glance user in the database as follows:

MYSQL_GLANCE_PASS=openstack
mysql -uroot -p$MYSQL_ROOT_PASS -e "GRANT ALL PRIVILEGES ON \glance.* TO 'glance'@'localhost' IDENTIFIED BY \'$MYSQL_KEYSTONE_PASS';"
mysql -uroot -p$MYSQL_ROOT_PASS -e "GRANT ALL PRIVILEGES ON \glance.* TO 'glance'@'%' IDENTIFIED BY '$MYSQL_GLANCE_PASS';"

We can now configure OpenStack Image Service to use this database by editing the /etc/glance/glance-registry.conf and /etc/glance/glance-api.conf files and changing the sql_connection line to match the database credentials. We do this by ensuring the following lines are in the files:
```
[database]
backend = sqlalchemy
connection = mysql://glance:openstack@172.16.0.200/glance
```

We configure OpenStack Image Service to use RabbitMQ by ensuring the following lines are present in /etc/glance/glance-registry.conf:

rabbit_host = localhost
rabbit_port = 5672
rabbit_use_ssl = false
rabbit_userid = guest
rabbit_password = guest
rabbit_virtual_host = /
rabbit_notification_exchange = glance
rabbit_notification_topic = notifications
rabbit_durable_queues = False

We can now restart the glance-registry service:

sudo stop glance-registry
sudo start glance-registry

Restart the glance-api service:

sudo stop glance-api
sudo start glance-api

The glance database is version controlled under Ubuntu 14.04 to allow the upgrade and downgrade of the service. We first set the version control to be 0 by issuing the following command:
```
sudo glance-manage db_version_control 0
```
We now sync the database to ensure the correct table structure is present. We do this by issuing the following command:
```
sudo glance-manage db_sync
```

Congratulations! We now have OpenStack Image service installed and ready for use in our OpenStack environment.

How it works...

OpenStack Image Service is split into two running services: glance-api and glance-registry. It is the glance-registry service that connects to the database backend. The first step is to create our glance database and the glance user, so it can perform operations on the glance database that we have created.

Once this is done, we modify the /etc/glance/glance-registry.conf and /etc/glance/glance-api.conf files so that glance knows where to find and connect to our MySQL database. This is provided by the standard SQLAlchemy connection string that has the following syntax:

sql_connection = mysql://USER:PASSWORD@HOST/DBNAME