2. Upgrading Ansible Tower¶

2.1. Upgrade Planning¶

This section covers changes that you should keep in mind as you attempt to upgrade your Ansible Tower Instance

• If you need to upgrade Red Hat Enterprise Linux and Ansible Tower, you will need to do a backup and restore of your Tower data. Refer to Upgrading an Existing Tower Installation in the Ansible Tower Installation and Reference Guide for further detail.

• Because Ansible Tower runs with Python 3 starting in 3.5, custom settings files in /etc/tower/conf.d must be valid Python3 prior to upgrading to Ansible Tower 3.5 or later.

• Clustered upgrades require special attention to instance and instance groups prior to starting the upgrade. Refer to the Setting up the Inventory File and ref:ag_clustering sections.

• Prior versions of Ansible Tower used the variable name rabbitmq_host during installation. If you are upgrading from a previous version of Tower, and you previously specified rabbitmq_host in your inventory, simply rename rabbitmq_host to routable_hostname before upgrading. See Clustering for details.

2.2. Obtaining Ansible Tower¶

You may install standalone Tower or use the bundled installer:

• if you set up Tower on an environment with a direct Internet access, you can download the standalone Tower installer

• if you set up Tower on an environment without direct access to online repositories, or your environment enforces a proxy, you must use the bundled installer

Download and then extract the Ansible Tower installation/upgrade tool: http://releases.ansible.com/ansible-tower/setup/

root@localhost:~$ tar xvzf ansible-tower-setup-latest.tar.gz
root@localhost:~$ cd ansible-tower-setup-<tower_version>

To install or upgrade, start by editing the inventory file in the ansible-tower-setup-<tower_version> directory, replacing <tower_version> with the version number, such as 3.6.4 or 3.7.0 directory.

2.3. Setting up the Inventory File¶

As you edit your inventory file, there are a few things you must keep in mind:

• The contents of the inventory file should be defined in ./inventory, next to the ./setup.sh installer playbook.

• For installations and upgrades: If you need to make use of external databases, you must ensure the database sections of your inventory file are properly setup. Edit this file and add your external database information before running the setup script.

• For upgrading an existing cluster: When upgrading a cluster, you may decide that you want to also reconfigure your cluster to omit existing instances or instance groups. Omitting the instance or the instance group from the inventory file will not be enough to remove them from the cluster. In addition to omitting instances or instance groups from the inventory file, you must also deprovision instances or instance groups before starting the upgrade. Otherwise, omitted instances or instance groups will continue to communicate with the cluster, which can cause issues with tower services during the upgrade.

• For clustered installations: If you are creating a clustered setup, you must replace localhost with the hostname or IP address of all instances. All nodes/instances must be able to reach any others using this hostname or address. In other words, you cannot use the localhost ansible_connection=local on one of the nodes AND all of the nodes should use the same format for the host names.

  Therefore, this will not work:

  [tower]
  localhost ansible_connection=local
  hostA
  hostB.example.com
  172.27.0.4
  

  Instead, use these formats:

  [tower]
  hostA
  hostB
  hostC
  

  OR

  hostA.example.com
  hostB.example.com
  hostC.example.com
  

  OR

  [tower]
  172.27.0.2
  172.27.0.3
  172.27.0.4
  

• For all standard installations: When performing an installation, you must supply any necessary passwords in the inventory file.

Example Inventory file

• For provisioning new nodes: When provisioning new nodes add the nodes to the inventory file with all current nodes, make sure all passwords are included in the inventory file.

• For upgrading a single node: When upgrading, be sure to compare your inventory file to the current release version. It is recommended that you keep the passwords in here even when performing an upgrade.

Example Single Node Inventory File

[tower]
localhost ansible_connection=local

[database]

[all:vars]
admin_password='password'

pg_host=''
pg_port=''

pg_database='awx'
pg_username='awx'
pg_password='password'

Example Multi Node Cluster Inventory File

[tower]
clusternode1.example.com
clusternode2.example.com
clusternode3.example.com

[database]
dbnode.example.com

[all:vars]
ansible_become=true

admin_password='password'

pg_host='dbnode.example.com'
pg_port='5432'

pg_database='tower'
pg_username='tower'
pg_password='password'

Example Inventory file for an external existing database

[tower]
node.example.com ansible_connection=local

[database]

[all:vars]
admin_password='password'
pg_password='password'


pg_host='database.example.com'
pg_port='5432'

pg_database='awx'
pg_username='awx'

Example Inventory file for external database which needs installation

[tower]
node.example.com ansible_connection=local


[database]
database.example.com

[all:vars]
admin_password='password'
pg_password='password'

pg_host='database.example.com'
pg_port='5432'

pg_database='awx'
pg_username='awx'

Once any necessary changes have been made, you are ready to run ./setup.sh.

2.4. The Setup Playbook¶

The Tower setup playbook script uses the inventory file and is invoked as ./setup.sh from the path where you unpacked the Tower installer tarball.

root@localhost:~$ ./setup.sh

The setup script takes the following arguments:

• -h – Show this help message and exit

• -i INVENTORY_FILE – Path to Ansible inventory file (default: inventory)

• -e EXTRA_VARS – Set additional Ansible variables as key=value or YAML/JSON (i.e. -e bundle_install=false forces an online installation)

• -b – Perform a database backup in lieu of installing

• -r – Perform a database restore in lieu of installing (a default restore path is used unless EXTRA_VARS are provided with a non-default path, as shown in the code example below)

./setup.sh -e 'restore_backup_file=/path/to/nondefault/location' -r