Install the ThoughtSpot application on online clusters that use Amazon Linux 2

Install ThoughtSpot on Amazon Linux 2 online clusters.

Before starting the install, complete the pre-installation steps. If you are using the AWS SSM agent as an alternative to SSH, you must run the Ansible playbook and all commands on the SSM console.

In an online cluster, the hosts can access the public repositories to download the required packages.

Before you build the ThoughtSpot cluster and install the ThoughtSpot application on the hosts, you must run the Ansible playbook. The TS Ansible playbook prepares your clusters in the following manner:

Ansible installs the required packages: YAML, Python, and R packages; see Packages installed with ThoughtSpot for Amazon Linux 2.
It creates and configures local user accounts for ThoughtSpot:
- admin user has full administrative functionality
- thoughtspot user can load data in the application
It installs the ThoughtSpot CLI, tscli.

It configures the ThoughtSpot host nodes:

checks that customization scripts can execute on the nodes
checks that the partitions meet minimum size requirements

❏	1. Configure the Ansible Playbook
❏	2. Run the Ansible Playbook
❏	3. Install ThoughtSpot

Configure the Ansible Playbook

To set up the Ansible, follow these steps:

Obtain the Ansible tarball by talking to your ThoughtSpot contact. Download it to your local machine.

You can download it by running the cp command. For example, if the tarball is in your S3 bucket, run aws s3 cp s3://bucket_name/path/to/the/tarball ./.

Note that you only need to copy the tarball to one node.
Unzip the Ansible tarball, to see the following files and directories on your local machine:

customize.sh

This script runs as the last step in the preparation process. You can use it to inject deployment-specific customizations, such as enabling or disabling a corporate proxy, configuring extra SSH keys, installing extra services, and so on. Additionally, you can include the prepare_disks script here. Add the following line to the customize.sh file: sudo /usr/local/scaligent/bin/prepare_disks.sh.

hosts.sample

The Ansible inventory file.

prod_image

This directory contains the ThoughtSpot tools and tscli, the ThoughtSpot CLI binary.

README.md

Basic information for the unzipped file

rpm_gpg

This directory contains the GPG keys that authenticate the public repository.

toolchain

The tools that are necessary to compile the instructions you define in the Ansible Playbook, the source code, into executables that can run on your device. The toolchain includes a compiler, a linker, and run-time libraries.

ts-new.yaml

The Ansible Playbook for new installations.

ts-update.yaml

The Ansible Playbook for updates.

ts.yaml

yum.repos.d

This directory contains information about the yum repo used by the cluster.
Copy the Ansible inventory file hosts.sample to hosts.yaml, and using a text editor of your choice, update the file to include your host configuration.

Copy the file by running this command: cp hosts.sample hosts.yaml.

If you are using SSM, you must additionally run a command to replace the ts_partition_name, and run a command to create a single partition on the disk mounted under /export. Run the following command to replace the ts_partition_name:
```
TS_DISK=disk_name_for_export_partition
  TS_PARTITION_NAME=${TS_DISK}1
sed -i "s/xvda9/$TS_PARTITION_NAME/g" hosts.yaml
```
Then run this command to create a single partition on the disk mounted under /export:
```
sudo parted -s /dev/$TS_DISK mklabel gpt
sudo parted -s /dev/$TS_DISK mkpart primary xfs 0% 100%
```
hosts

Add the IP addresses or hostnames of all hosts in the ThoughtSpot cluster.

admin_uid

The admin user ID parameter. If you are using ssh instead of AWS SSM, use the default values. If you are using SSM, the ssm_user uses the default value, 1001. You must choose a new value. Note that the thoughtspot user uses 1002, so you cannot use 1001 or 1002.

admin_gid

The admin user group ID. If you are using ssh instead of AWS SSM, use the default values. If you are using SSM, the ssm_user uses the default value, 1001. You must choose a new value. Note that the thoughtspot user uses 1002, so you cannot use 1001 or 1002.

ssh_user

The ssh_user must exist on the ThoughtSpot host, and it must have sudo privileges. This user is the same as the ec2_user.

If you are using AWS SSM instead of ssh, there is no need to fill out this parameter.
ssh_private_key
Add the private key for ssh access to the hosts.yaml file. You can use an existing key pair, or generate a new key pair in the Ansible Control server.
Run the following command to verify that the Ansible Control Server can connect to the hosts over ssh:
```
ansible -m ping -i hosts.yaml all
```
If you are using AWS SSM instead of ssh, there is no need to fill out this parameter or run the above command.
ssh_public_key
Add the public key to the ssh authorized_keys file for each host, and add the private key to the hosts.yaml file. You can use an existing key pair, or generate a new key pair in the Ansible Control server.
Run the following command to verify that the Ansible Control Server can connect to the hosts over ssh:
```
ansible -m ping -i hosts.yaml all
```
If you are using AWS SSM instead of ssh, there is no need to fill out this parameter or run the above command.
extra_admin_ssh_key

[Optional] An additional or extra key may be required by your security application, such as Qualys, to connect to the hosts.
If you are using AWS SSM instead of ssh, there is no need to fill out this parameter.

http(s)_proxy

If the hosts must access public repositories through an internal proxy service, provide the proxy information.
This release of ThoughtSpot does not support proxy credentials to authenticate to the proxy service.

ts_partition_name

The extended name of the ThoughtSpot export partition, such as /dev/sdb1.

Run the Ansible Playbook

Run the Ansible Playbook from your local machine or the SSM console by entering the following command:

ansible-playbook -i hosts.yaml ts.yaml

As the Ansible Playbook runs, it will perform these tasks:

Trigger the installation of Yum, Python, and R packages
Configure the local user accounts that the ThoughtSpot application uses
Install the ThoughtSpot CLI
Configure all the nodes in the ThoughtSpot cluster:
- Format and create export partitions, if they do not exist

After the Ansible Playbook finishes, run the prepare_disks script on every node, if you did not include it in the customize.sh file. Specify the data drives by adding the full device path for all data drives, such as /dev/sdc, after the script name. Separate data drives with a space.

sudo /usr/local/scaligent/bin/prepare_disks.sh /dev/sdc /dev/sdd

Your hosts are ready for installing the ThoughtSpot application.

Install the ThoughtSpot cluster and the application

Refer to Install ThoughtSpot clusters in AWS for more detailed information on installing the ThoughtSpot cluster.

Follow these general steps to install ThoughtSpot on the prepared hosts:

Connect to the host as an admin user.
Download the release artifact from the ThoughtSpot file sharing system.
Upload the release artifact to the first host.
Run the tscli cluster create command. This script prompts for user input.
Check the cluster health by running health checks and logging into the application.