关于吃糖果的小游戏

書名： OpenStack Cloud Computing Cookbook（Third Edition）
作者名： Kevin Jackson Cody Bunch Egle Sigler
本章字數： 258字
更新時間： 2021-07-16 20:39:16

Sharing images among tenants

When an image is private, it is only available to the tenant to which that image was uploaded. OpenStack Image Service provides a mechanism whereby these private images can be shared between different tenants. This allows greater control over images that need to exist for different tenants without making them public for all tenants.

Getting ready

To begin with, ensure you are logged in to our Ubuntu client where we can run the glance tool. This can be installed using the following command:

sudo apt-get update
sudo apt-get install glance-client

Ensure that you have your environment variable set up correctly with our admin user and password, as created in the previous chapter:

export OS_TENANT_NAME=cookbook
export OS_USERNAME=admin
export OS_PASSWORD=openstack
export OS_AUTH_URL=https://192.168.100.200:5000/v2.0/
export OS_NO_CACHE=1
export OS_KEY=/vagrant/cakey.pem
export OS_CACERT=/vagrant/ca.pem

How to do it...

Carry out the following steps to share a private image in our cookbook tenant to another tenant:

We first get the tenant ID of the tenant that is able to use our image. We do this as follows:
```
keystone tenant-list 
```
We then list our images as follows:
```
glance image-list
```
From our cookbook tenant with ID 45c787efeaec42aa9cab522711bf5f4d and an image with ID 18584bff-2c12-4c2d-85f6-59771073c936, we would share the image as follows:
```
glance member-create \
 18584bff-2c12-4c2d-85f6-59771073c93 \
 45c787efeaec42aa9cab522711bf5f4d
```

How it works...

The member-create option for the glance command allows us to share images with other tenants. The syntax is as follows:

glance [--can-share] member-create image-id tenant-id

The preceding command comes with an optional extra parameter, --can-share, that gives permission to that tenant to share the image.

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OpenStack Cloud Computing Cookbook（Third Edition）

Sharing images among tenants

Getting ready

How to do it...

How it works...