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Chapter 3. Deployment
The following procedure involves the use of Ansible to enable Instance HA. For more information about Ansible, see Ansible Documentation.
3.1. Creating the Necessary Ansible Configuration Files
Enabling Instance HA through Ansible requires an inventory file and SSH arguments file. Both files pass the Ansible variables necessary for implementing Instance HA on your overcloud.
Inventory File
The inventory file lists the different target hosts for the ansible playbooks. It is divided into two sections: the first section lists each node (by name), along with the hostname, username, and private key file that Ansible should use for each playbook command. For example:
overcloud-controller-0 ansible_host=overcloud-controller-0 ansible_user=heat-admin ansible_private_key_file=/home/stack/.ssh/id_rsa
overcloud-controller-0 ansible_host=overcloud-controller-0 ansible_user=heat-admin ansible_private_key_file=/home/stack/.ssh/id_rsa
The second section lists each node under the following headings (or node types): compute, undercloud, overcloud, or controller.
Create an inventory file named /home/stack/hosts. The following sample demonstrates the syntax required for this:
To generate a complete inventory of all hosts in both undercloud and overcloud, run the following command:
stack@director $ tripleo-ansible-inventory --list
stack@director $ tripleo-ansible-inventory --listThis command will generate a detailed and updated inventory in JSON format. See Running Ansible Automation for more details.
SSH Arguments File
The SSH arguments file passes the necessary credentials and authentication settings needed by Ansible to run the playbooks on each target host.
Create an SSH arguments file using the following commands (from /home/stack):
stack@director $ cat /home/stack/.ssh/id_rsa.pub >> /home/stack/.ssh/authorized_keys
stack@director $ echo -e "Host undercloud\n Hostname 127.0.0.1\n IdentityFile /home/stack/.ssh/id_rsa\n User stack\n StrictHostKeyChecking no\n UserKnownHostsFile=/dev/null\n" > ssh.config.ansible
stack@director $ source /home/stack/stackrc
stack@director $ openstack server list -c Name -c Networks | awk '/ctlplane/ {print $2, $4}' | sed s/ctlplane=//g | while read node; do node_name=$(echo $node | cut -f 1 -d " "); node_ip=$(echo $node | cut -f 2 -d " "); echo -e "Host $node_name\n Hostname $node_ip\n IdentityFile /home/stack/.ssh/id_rsa\n User heat-admin\n StrictHostKeyChecking no\n UserKnownHostsFile=/dev/null\n"; done >> ssh.config.ansible
stack@director $ cat /home/stack/.ssh/id_rsa.pub >> /home/stack/.ssh/authorized_keys
stack@director $ echo -e "Host undercloud\n Hostname 127.0.0.1\n IdentityFile /home/stack/.ssh/id_rsa\n User stack\n StrictHostKeyChecking no\n UserKnownHostsFile=/dev/null\n" > ssh.config.ansible
stack@director $ source /home/stack/stackrc
stack@director $ openstack server list -c Name -c Networks | awk '/ctlplane/ {print $2, $4}' | sed s/ctlplane=//g | while read node; do node_name=$(echo $node | cut -f 1 -d " "); node_ip=$(echo $node | cut -f 2 -d " "); echo -e "Host $node_name\n Hostname $node_ip\n IdentityFile /home/stack/.ssh/id_rsa\n User heat-admin\n StrictHostKeyChecking no\n UserKnownHostsFile=/dev/null\n"; done >> ssh.config.ansible
These commands will result in the creation of an SSH arguments file named /home/stack/ssh.config.ansible, which will contain host-specific connection options for each overcloud node. For example:
3.2. Preparing the Undercloud
After creating the inventory file and SSH arguments file (from Section 3.1, “Creating the Necessary Ansible Configuration Files”), you can now prepare the overcloud for Instance HA:
-
Log in to the undercloud as the
stackuser. Clone the
tripleo-ha-utilsGit repository.stack@director $ git clone git://github.com/openstack/tripleo-ha-utils
stack@director $ git clone git://github.com/openstack/tripleo-ha-utilsCopy to Clipboard Copied! Toggle word wrap Toggle overflow This repository contains the playbooks, roles, and other utilities necessary to enable and test Instance HA with Ansible.
Create
/home/stack/ansible.cfgwith the following contents:[defaults] roles_path = /home/stack/tripleo-ha-utils/roles
[defaults] roles_path = /home/stack/tripleo-ha-utils/rolesCopy to Clipboard Copied! Toggle word wrap Toggle overflow Export the
ansible.cfg, hosts (the inventory file), andssh.config.ansible(the SSH arguments file) to the following environment variables:stack@director $ export ANSIBLE_CONFIG="/home/stack/ansible.cfg" stack@director $ export ANSIBLE_INVENTORY="/home/stack/hosts" stack@director $ export ANSIBLE_SSH_ARGS="-F /home/stack/ssh.config.ansible"
stack@director $ export ANSIBLE_CONFIG="/home/stack/ansible.cfg" stack@director $ export ANSIBLE_INVENTORY="/home/stack/hosts" stack@director $ export ANSIBLE_SSH_ARGS="-F /home/stack/ssh.config.ansible"Copy to Clipboard Copied! Toggle word wrap Toggle overflow -
Ensure that the node definition template of the overcloud (by default,
instackenv.json) is located in/home/stack/. For more information about the node definition template, see Registering Nodes for the Overcloud.
3.3. Enabling Instance HA
Once the undercloud is fully prepared, you can now run the prescribed playbooks you downloaded and extracted in Section 3.2, “Preparing the Undercloud”. These playbooks allow you to enable Instance HA with or without configuring STONITH for Controller and Compute nodes. For more information about STONITH, see Fencing the Controller Nodes.
To enable Instance HA and configure STONITH for both Controller and Compute nodes:
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \ -e release="RELEASE"
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \
-e release="RELEASE"
By default, the playbook will install the instance-ha solution with shared storage enabled. If your overcloud does not use shared storage, use the instance_ha_shared_storage=false option:
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \ -e release="RELEASE" -e instance_ha_shared_storage=false
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \
-e release="RELEASE" -e instance_ha_shared_storage=falseSee Section 2.1, “Exceptions for Shared Storage” for more information about shared storage in Instance HA.
To enable Instance HA without configuring STONITH for both Controller and Compute nodes:
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \ -e release="RELEASE" -e stonith_devices="none"
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \
-e release="RELEASE" -e stonith_devices="none"To enable Instance HA and configure STONITH only on Compute nodes (for example, if STONITH is already configured on the Controller nodes):
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \ -e release="RELEASE" -e stonith_devices="computes"
stack@director $ ansible-playbook /home/stack/tripleo-ha-utils/playbooks/overcloud-instance-ha.yml \
-e release="RELEASE" -e stonith_devices="computes"
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