A host group represents a group of hosts, typically with similar names or IP addresses, each of which can be specified in an operator with its FQDN or IP address. A host group references hosts as subnets of IP addresses, host name patterns, or a list of specific IP addresses and FQDNs.
Host groups provide direct access, that is, the ability to specify an IP address or FQDN in an operator, as opposed to a touchpoint or proxy touchpoint name. Hosts referenced in a host group do not need agents or proxy touchpoint associations. Avoid including a host that belongs to a clustered Orchestrator in a host group. Content designers cannot target such a host by its IP address or FQDN.
You can define multiple host groups on the same agent. A given agent could have one host group for variants of a Windows operating system and another for variants of a UNIX operating system.
You can define the same host group on one or more agents. When the same host group resides on multiple agents, the agent selected to run the operator depends on the priority of the agent.
To execute CA Process Automation operators on a remote host, a local host with a CA Process Automation agent that is mapped to a host group must gain access to the target host. The agent uses SSH to gain access to a target remote host and run operators on it. You define SSH access from the agent host to each target host represented by the host group with an SSH user account and, optionally, a trusted SSH relationship.
Properties for a host group include a setting for the maximum number of SSH connections. SSHD servers typically have limits in default configurations. The SSH connection remains open while the program or script is running on the target host. CA Process Automation implements internal queuing, by destination. If you set the value to 20, and then you run 40 scripts simultaneously on the same target host, only 20 run concurrently. New scripts start as others finish. With host groups, where the same agent is a proxy for multiple remote hosts, each remote host has a specific limit. So, this setting does not affect the number of hosts in the host group. The limit for the number of hosts is the maximum number of concurrent TCP connections that the operating system for the agent supports. Some operating systems support a high number of current TCP connections.
Important! Although a host group could include remote hosts with agents, do not create a host group of hosts with agents as a means of allowing them to be referenced directly. Reference by Touchpoint and proxy touchpoint is highly preferred for its flexibility and processing speed.
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