81 lines
3.4 KiB
ReStructuredText
81 lines
3.4 KiB
ReStructuredText
Backing up and Restoring your Undercloud
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========================================
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Backing up your Undercloud
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--------------------------
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In order to backup your undercloud you need to make sure the following items are backed up
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* All MariaDB databases on the undercloud node
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* MariaDB configuration file on undercloud (so we can restore databases accurately)
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* All glance image data in /var/lib/glance/images
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* All swift data in /srv/node
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* All data in stack users home directory
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The following commands can be used to perform a backup of all data from the undercloud node::
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mysqldump --opt --all-databases > /root/undercloud-all-databases.sql
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tar -czf undercloud-backup-`date +%F`.tar.gz undercloud-all-databases.sql /etc/my.cnf.d/server.cnf /var/lib/glance/images /srv/node /home/stack /etc/pki /opt/stack
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Restoring a backup of your Undercloud on a Fresh Machine
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--------------------------------------------------------
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The following restore process assumes you are recovering from a failed undercloud node where you have to reinstall it from scratch.
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It assumes that the hardware layout is the same, and the hostname and undercloud settings of the machine will be the same as well.
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Once the machine is installed and is in a clean state, re-enable all the subscriptions/repositories needed to install and run TripleO.
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Note that unless specified, all commands are run as root.
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Then install mariadb server with::
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yum install -y mariadb-server
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Now restore the MariaDB configuration file and database backup, then start the MariaDB server and load the backup in::
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tar -xzC / -f undercloud-backup-$DATE.tar.gz etc/my.cnf.d/server.cnf /root/undercloud-all-databases.sql
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# Edit /etc/my.cnf.d/server.cnf and comment out 'bind-address'
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systemctl start mariadb
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cat /root/undercloud-all-databases.sql | mysql
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# Now we need to clean out some old permissions to be recreated
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for i in ceilometer glance heat ironic keystone neutron nova;do mysql -e "drop user $i";done
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mysql -e 'flush privileges'
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Now create the stack user and restore the stack users home directory::
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sudo useradd stack
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sudo passwd stack # specify a password
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echo "stack ALL=(root) NOPASSWD:ALL" | sudo tee -a /etc/sudoers.d/stack
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sudo chmod 0440 /etc/sudoers.d/stack
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Next restore the stack users home directory::
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tar -xzC / -f undercloud-backup-$DATE.tar.gz home/stack
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We have to now install the swift and glance base packages, and then restore their data::
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yum install -y openstack-glance openstack-swift
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tar -xzC / -f undercloud-backup-$DATE.tar.gz srv/node var/lib/glance/images
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# Confirm data is owned by correct user
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chown -R swift: /srv/node
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chown -R glance: /var/lib/glance/images
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Finally we rerun the undercloud installation from the stack user, making sure to run it in the stack user home dir::
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su - stack
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sudo yum install -y python-tripleoclient
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# Double check hostname is correctly set in /etc/hosts
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openstack install undercloud
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If you are using Pike and Ceph will be used in the overcloud, install
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ceph-ansible on the undercloud::
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sudo yum install -y ceph-ansible
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Reconnect the restored undercloud to the overcloud
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--------------------------------------------------
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Having completed the steps above, the undercloud can be expected to automatically
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restore its connection to the overcloud. The nodes will continue to poll
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Orchestration (heat) for pending tasks, using a simple HTTP request issued every
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few seconds.
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