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Installing
Use this information to install, upgrade, and uninstall the Teracloud® Streams product.
Planning to install Teracloud® Streams
To plan for installing Teracloud® Streams, start by reviewing the information in the planning roadmap.
Linux ulimit configuration guidelines
The default Linux™ user limit (ulimit) values might be too small for some Teracloud® Streams environments. Use these guidelines to ensure that your ulimit settings are sufficient for Teracloud Streams.
Users that require ulimit settings
Depending on your environment, ulimit values must be set for specific users on the systems that run Teracloud® Streams services.

Welcome
Learn about the core capabilities of Teracloud® Streams, its architecture, and key concepts.
Installing
Use this information to install, upgrade, and uninstall the Teracloud® Streams product.
- Planning to install Teracloud® Streams
  To plan for installing Teracloud® Streams, start by reviewing the information in the planning roadmap.
  - Preparing to install Teracloud® Streams
    Use the information in this topic to plan and prepare for your Teracloud® Streams installation. The plan that you create for your environment determines your tasks and choices throughout the installation process.
  - Considerations for environments with multiple resources
    Review these options and requirements for Teracloud® Streams environments before you install the product.
  - Hardware requirements
    Before you install Teracloud® Streams, ensure that the target system satisfies the minimum hardware requirements.
  - Software requirements
    Before you install Teracloud® Streams, run the dependency checker script to verify that the target system satisfies the product software requirements.
  - Domain controller service options
    A domain controller service runs on every resource in a Teracloud® Streams domain and manages all of the other services on that resource. You can set up the domain controller service as a registered Linux™ system service or an unregistered service.
  - Firewall configuration guidelines
    If firewall usage is required, the preferred configuration is to set up a firewall at the perimeter of the Teracloud® Streams cluster to restrict network access to resources in the cluster but not communication between the resources. When any communication passes through a firewall, latency is introduced. These guidelines apply to clients that are in the Teracloud Streams cluster as well as clients that are external to the cluster.
  - Linux ulimit configuration guidelines
    The default Linux™ user limit (ulimit) values might be too small for some Teracloud® Streams environments. Use these guidelines to ensure that your ulimit settings are sufficient for Teracloud Streams.
    - Users that require ulimit settings
      Depending on your environment, ulimit values must be set for specific users on the systems that run Teracloud® Streams services.
    - Verifying ulimit requirements
      Teracloud® Streams requires that the hard and soft ulimit values for the maximum number of processes and open files are set to 100000 or higher. Teracloud Streams provides tools that you can use to verify that these ulimit settings meet the product requirements.
    - Reviewing ulimit settings
      Use these commands to review ulimit settings for Teracloud® Streams users and services.
    - Updating ulimit settings
      There are several ways to change ulimit settings. The examples in this procedure show one way to change the hard and soft ulimit settings for Teracloud® Streams.
  - Name resolution requirements for resources
    All resources must satisfy the product network configuration requirements or Teracloud® Streams fails to start on the resource.
- Installing the Teracloud® Streams product
  Use these procedures to install Teracloud® Streams Version 7.2.
- Upgrading Teracloud® Streams
  Use these procedures to install a new version of Teracloud® Streams when a previous version of the product is already installed, or to update a Version 7.2 Non-Production Edition license.
- Uninstalling Teracloud® Streams
  Use this procedure to remove the Teracloud® Streams product from your system.
Configuring
Create a basic or an enterprise domain which is a single point for configuring and managing common resources, security, and instances.
Administering
Administer the product by using the Teracloud® Streams graphical user interface, APIs, or the streamtool command-line interface.
Developing
Develop stream applications with the Streams Processing Language (SPL), Java, and Python.
Troubleshooting
Resolve problems with Teracloud® Streams using the troubleshooting tools provided with the product as well as the resources offered by Teracloud Support.
Reference
Find details on the SPL language, toolkits, APIs, commands, and more.
Glossary
Use this glossary to find terms and definitions for Teracloud® Streams.

Teracloud® Streams users that require ulimit settings

Depending on your environment, ulimit values must be set for specific users on the systems that run Teracloud® Streams services.

Ensure that you set ulimit values for the Teracloud® Streams users that are listed in the following table and that those values satisfy the Teracloud® Streams ulimit requirements.

Table 1. Users that require ulimit settings
Environment	Set ulimit value for:
The domain controller service is running as a registered Linux™ system service. The domain controller service is running unregistered as root.	Root user User who owns the installation files User on the instance.runAsUser property, if specified Note: By default, non-root users inherit the ulimit settings of the root user because Teracloud® Streams processes are launched by the root user. If a non-root user needs different ulimit settings, the administrator must explicitly specify those settings in the Linux™ security file, for example: `root soft nofile 100000 root hard nofile 100000 streamsuser soft nofile 111113 streamsuser hard nofile 111113`
The domain controller service is running unregistered as non-root.	User who starts the domain