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Chapter 3. Restore

This section describes how to restore the undercloud used in the Red Hat OpenStack Platform Director.

3.1. Restore the Undercloud
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The following restore process assumes you are recovering a failed undercloud node, and you need to reinstall it from scratch. It assumes that the hardware layout is identical, and the hostname and undercloud settings of the machine will also be identical.

Once the machine is installed and is in a clean state, re-enable all the subscriptions/repositories needed to install and run director. Run the following commands as the root user:

1. Install the mariadb server: 

# yum install -y mariadb-server
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2. Restore the MariaDB configuration file and database backup, then start the MariaDB server and load the backup data:

a. As the root user, restore the MariaDB files: 

# tar -xzC / -f undercloud-backup-$DATE.tar.gz etc/my.cnf.d/server.cnf
# tar -xzC / -f undercloud-backup-$DATE.tar.gz root/undercloud-all-databases.sql
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b. Edit /etc/my.cnf.d/server.cnf and comment out the bind-address entry.

c. Start the mariadb service and temporarily update the max_allowed_packet setting: 

# systemctl start mariadb
# mysql -uroot -e"set global max_allowed_packet = 16777216;"
# cat /root/undercloud-all-databases.sql | mysql
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d. Clean up certain permissions (to be recreated later): 

# for i in ceilometer glance heat ironic keystone neutron nova;do mysql -e "drop user $i";done
# mysql -e 'flush privileges'
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3. Create the stack user account: 

# sudo useradd stack
# sudo passwd stack  # specify a password
# echo "stack ALL=(root) NOPASSWD:ALL" | sudo tee -a /etc/sudoers.d/stack
# sudo chmod 0440 /etc/sudoers.d/stack
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4. Restore the stack user home directory: 

# tar -xzC / -f undercloud-backup-$DATE.tar.gz home/stack
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5. Install the swift and glance base packages, and then restore their data: 

# yum install -y openstack-glance openstack-swift
# tar --xattrs -xzC / -f undercloud-backup-$DATE.tar.gz srv/node var/lib/glance/images
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6. Confirm the data is owned by the correct user: 

# chown -R swift: /srv/node
# chown -R glance: /var/lib/glance/images
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7. Restore your undercloud SSL certificates: 

# tar -xzC / -f undercloud-backup-$DATE.tar.gz /etc/pki/instack-certs/undercloud.pem
# tar -xzC / -f undercloud-backup-$DATE.tar.gz /etc/pki/ca-trust/source/anchors/cacert.pem
# tar -xzC / -f undercloud-backup-$DATE.tar.gz /etc/pki/ca-trust/source/anchors/overcloud.pem
# update-ca-trust extract
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8. Re-run the undercloud installation as the stack user, making sure to run it in the stack user home directory: 

# su - stack
$ sudo yum install -y python-tripleoclient
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9. Confirm that the hostname is correctly set in /etc/hosts.

10. Reinstall the undercloud: 

$ openstack undercloud install
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10. Restore the docker directories and files and restart the service: 

# tar -xzC / -f undercloud-backup-$DATE.tar.gz /var/lib/docker
# tar -xzC / -f undercloud-backup-$DATE.tar.gz /var/lib/registry
# tar -xzC / -f undercloud-backup-$DATE.tar.gz /etc/docker
# tar -xzC / -f undercloud-backup-$DATE.tar.gz /etc/docker-distribution
# tar -xzC / -f undercloud-backup-$DATE.tar.gz /etc/sysconfig/docker*
# systemctl restart docker docker-distribution
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3.2. Reconnect the restored undercloud to the overcloud
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Having completed the steps above, the undercloud can be expected to automatically restore its connection to the overcloud. The nodes will continue to poll Orchestration (heat) for pending tasks, using a simple HTTP request issued every few seconds.

3.3. Validate the Completed Restore
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Use the following commands to perform a healthcheck of your newly restored environment:

3.3.1. Check Identity Service (Keystone) Operation
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This step validates Identity Service operations by querying for a list of users. 

# source overcloudrc
# openstack user list
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When run from the controller, the output of this command should include a list of users created in your environment. This action demonstrates that keystone is running and successfully authenticating user requests. For example: 

# openstack user list
+----------------------------------+------------+---------+----------------------+
|                id                |    name    | enabled |        email         |
+----------------------------------+------------+---------+----------------------+
| 9e47bb53bb40453094e32eccce996828 |   admin    |   True  |    root@localhost    |
| 9fe2466f88cc4fa0ba69e59b47898829 | ceilometer |   True  | ceilometer@localhost |
| 7a40d944e55d422fa4e85daf47e47c42 |   cinder   |   True  |   cinder@localhost   |
| 3d2ed97538064f258f67c98d1912132e |    demo    |   True  |                      |
| 756e73a5115d4e9a947d8aadc6f5ac22 |   glance   |   True  |   glance@localhost   |
| f0d1fcee8f9b4da39556b78b72fdafb1 |  neutron   |   True  |  neutron@localhost   |
| e9025f3faeee4d6bb7a057523576ea19 |    nova    |   True  |    nova@localhost    |
| 65c60b1278a0498980b2dc46c7dcf4b7 |   swift    |   True  |   swift@localhost    |
+----------------------------------+------------+---------+----------------------+
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3.3.2. Check the OpenStack Services
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Run the openstack-status command to view the status of OpenStack services: 

# openstack-status
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