Systems and topology overview#
HCL™ Launch includes several systems, including a server and one or more agents. You can configure multiple topologies, including ones that use high availability, disaster recovery, and so on, to meet your needs.
The following system topologies, including diagrams, are shown. For explanation of the system components, see the Description of systems.
- Core topology
- Multi-region topology
- High-availability clustered topologies
- Disaster recovery topologies
- Default ports
- Description of systems
The core installation of HCL Launch includes a server, agents, and a license server. Clients access the server through web browsers, the REST API, or the command-line client. Agents can be installed on cloud environments, virtual machines (VMs), containers, or physical systems; the agents are shown on cloud systems in the following diagrams, but they can be installed on many different systems.
To install the core components, see Installing HCL Launch.
If your environment has multiple security zones that are divided by firewalls, you can use agent relays to connect agents to the server through the firewalls. For example, if your HCL Launch server is within a firewall, but your target environments are outside the firewall, the agents on those target environments cannot connect directly to the server. In this case, you install an agent relay outside the firewall to allow the agents to connect to the server through the firewall, as shown in the following diagram.
To install and configure an agent relay, see Installing agent relays.
High-availability clustered topologies#
High-availability topologies use multiple servers. These servers can all be running at the same time to share the load (as in a clustered topology), or they can be waiting for another server to fail (as in a cold standby topology). The following diagram shows a clustered topology in which a load balancer distributes connections to three servers. Users connect directly to the load balancer, which sends them to an active server. Agents connect via HTTP and HTTPS to the load balancer. The servers store their files on a shared database and file system.
To configure a cluster of servers, see Setting up clusters of servers.
Disaster recovery topologies#
One way to prepare for disaster recovery is to have a cold standby system, including a stopped server and a replicated copy of the database and file system. The following diagram shows a simple topology with a cold standby server and related resources on standby.
To configure a cold standby system for the server, see Adding cold standby servers.
The following diagram shows the default port numbers that HCL Launch uses for communication. Most of these ports can change depending on your choices at installation time. The following diagram is only a summary of the defaults.
For more information about ports, see System requirements and performance considerations.
Description of systems#
HCL™ Launch server
The HCL™ Launch server stores components, processes, and other elements with which you model automated application deployments. You run automated deployments from the server.
Web browsers are the main way that users interact with the server. The HCL™ Launch browser-based GUI is a Rich Internet Application (RIA) that maintains much of its functionality in the browser. Clients interact with RESTful (representational state transfer) services on the server as needed.
The command-line client provides access to the server through the command line. It can automate functions on the server, such as creating components and applications, and provides most of the features that are found in the browser-based GUI. The command-line client is also built on top of RESTful services. See Command-line client (CLI) reference.
The REST API provides access to the server through HTTP. Like the command-line client, it can automate functions on the server, such as creating components and applications.
The agents run processes on target systems. Agents can run on physical computers, virtual systems, or cloud systems. See Agents.
An agent relay is a communication proxy for agents that are located behind a firewall or in another network location. See Agent relays.
The license server provides licenses to the server. For more information on the license server, see License management.
CodeStation stores component versions and artifacts. It is part of the HCL™ Launch server.
Parent topic: Overview of HCL Launch