Configure_simplestreams_for_a_private_cloud.md

+# Configure Simplestreams for a private cloud
+
+When Juju bootstraps a cloud, it needs two critical pieces of information:
+
+**The uuid of the image to use when starting new compute instances.**
+
+**The URL from which to download the correct version of a tools tarball.**
+
+We can simply think the essential information above is stored in two json files.
+
+To learn more details ,you can refer [here](https://jujucharms.com/docs/1.25/howto-privatecloud).
+
+Before generating  the json files,we need to do some preparation:
+
+
+1. Upload Ubuntu 14.04LTS(Trusty) and Ubuntu 16.04LTS(Xenial)  image to Openstack 
+
+   [Trusty image](http://cloud-images.ubuntu.com/trusty/20161014/) 
+
+   [Xenial image](http://cloud-images.ubuntu.com/xenial/20161014/)
+
+   Choose xxxxx-server-cloudimg-amd64-disk1.img to download.
+
+   Upload the images to openstack:
+
+   ![upload_image1](/uploads/1308a36f5dc021bf0b699b878f0f607c/upload_image1.png)
+
+  ![upload_image2](/uploads/88cf9453b9c826f36d5669d9e29d564a/upload_image2.png)
+
+
+2. Install Apache server 
+
+   ```shell
+   sudo apt-get install apache2
+   ```
+
+   ​
+
+3. Generate image json file:
+
+   ```shell
+   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
+   ```
+
+   Regarding the command-line flags used:
+
+   * -i 843bef24-8c70-40e1-a380-972717c9e4b3: specifies the ID of the Glance image that we just created before.
+   * -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.
+   * -e openstack: identifies the Juju environment described in $HOME/.juju/environments.yaml file.
+   * -s xenial: specifies the image series (the Ubuntu release name).
+   * -a amd64: specifies the CPU architecture.
+   * -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..
+
+4. Generate tools json file:
+
+   ```shell
+   juju metadata generate-tools -d /var/www/html/stack/ --stream released
+   ```
+
+   Tips:
+
+   `/var/www/html` is the Apache server default directory
+
+5. Use the validation command to ensure iamge and tools are available for juju to use:
+
+   ```shell
+   juju metadata validate-images
+   juju metadata validate-tools
+   ```
+
+6. Download tool files:
+
+   [Download link](https://streams.canonical.com/juju/tools/agent/1.25.6/juju-1.25.6-xenial-amd64.tgz)
+
+   Download and put it in the directory `/var/www/html/stack/tools/released`
+
+   Tips:
+
+   Download the files that match Juju and operating system version
+
+7. Change the files permission 
+
+   ```shell
+   cd /var/www/html/stack
+   sudo chmod -R 777 ./*
+   ```
+
+8. Bootstrap Juju
+
+   ```shell
+   juju switch openstack
+   juju bootstrap
+   ```
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