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# Configure Simplestreams for a private cloud
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When Juju bootstraps a cloud, it needs two critical pieces of information:
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**The uuid of the image to use when starting new compute instances.**
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**The URL from which to download the correct version of a tools tarball.**
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We can simply think the essential information above is stored in two json files.
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To learn more details ,you can refer [here](https://jujucharms.com/docs/1.25/howto-privatecloud).
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Before generating the json files,we need to do some preparation:
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1. Upload Ubuntu 14.04LTS(Trusty) and Ubuntu 16.04LTS(Xenial) image to Openstack
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[Trusty image](http://cloud-images.ubuntu.com/trusty/20161014/)
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[Xenial image](http://cloud-images.ubuntu.com/xenial/20161014/)
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Choose xxxxx-server-cloudimg-amd64-disk1.img to download.
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Upload the images to openstack:
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2. Install Apache server
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```shell
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sudo apt-get install apache2
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```
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3. Generate image json file:
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```shell
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sudo juju metadata generate-image -a amd64 -i 843bef24-8c70-40e1-a380-972717c9e4b3 -r RegionOne -s xenial -d /var/www/html/stack -u http://172.16.1.3:5000/v2.0 -e openstack
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```
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Regarding the command-line flags used:
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* -i 843bef24-8c70-40e1-a380-972717c9e4b3: specifies the ID of the Glance image that we just created before.
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* -u http://172.16.1.3:5000/v2.0: specifies the Keystone URL, and should match the value from the auth-url field of our environment as specified in $HOME/.juju/environments.yaml.
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* -e openstack: identifies the Juju environment described in $HOME/.juju/environments.yaml file.
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* -s xenial: specifies the image series (the Ubuntu release name).
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* -a amd64: specifies the CPU architecture.
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* -d /var/www/html/stack: specifies the base directory where the metadata will be written to. For images, the path will be /opt/stack/images/streams/v1..
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4. Generate tools json file:
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```shell
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juju metadata generate-tools -d /var/www/html/stack/ --stream released
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```
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Tips:
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`/var/www/html` is the Apache server default directory
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5. Use the validation command to ensure iamge and tools are available for juju to use:
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```shell
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juju metadata validate-images
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juju metadata validate-tools
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```
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6. Download tool files:
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[Download link](https://streams.canonical.com/juju/tools/agent/1.25.6/juju-1.25.6-xenial-amd64.tgz)
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Download and put it in the directory `/var/www/html/stack/tools/released`
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Tips:
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Download the files that match Juju and operating system version
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7. Change the files permission
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```shell
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cd /var/www/html/stack
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sudo chmod -R 777 ./*
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```
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8. Bootstrap Juju
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```shell
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juju switch openstack
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juju bootstrap
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``` |
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\ No newline at end of file |
