Thursday Oct 08, 2015

Agent versus Agentless Management

I've seen a couple of questions recently about the differences between Agent managed and Agentless assets, so I thought I'd explain the differences and the relative merits.

You can manage operating systems and virtualization technologies in one of two ways - by installing an Ops Center Agent on them, or by providing Ops Center with credentials that it can use to reach the asset. The agent is tailored to the system - there are separate types of Agents for Zones and LDoms.

If you don't want to have anything else installed on a system, agentless management can provide management and monitoring capabilities. However, there are some features that aren't available for assets that are managed agentlessly. There's a table in the OS Management chapter that explains what features are and are not available with agentless assets.

Thursday Oct 31, 2013

Agent versus Agentless management

I got a couple of questions about Agentless asset management:

"What does agentless management do for an asset?"

Agentless management is one of the two ways that you can manage an operating system. Rather than installing an Agent Controller on the OS, agentless management uses SSH to regularly check the system and gather monitoring data. Many of the actions that would be available on an agent-managed system are available on an agentless system, but actions such as running reports or updating an Oracle Solaris 10 or Linux OS are not available. A table showing the capabilities of agentless management is here.

"What permissions does agentless management require?"

Agentless management still requires root credentials. If you can't log into the system as root, you can provide one set of credentials for the login, and then a set of root credentials to switch to.

Thursday Feb 07, 2013

Agent Controller requirements

I got a question about the requirements for Agent Controller installation:

"The Certified Systems doc talks about the supported operating systems for Agents, but it doesn't say if specific packages or patches are required. Where can I find out if my OSes can support an agent?"

We figured that a tool to check a system for Agent compatibility would be easier to use than a list of required packages and patches. The OCDoctor, among other functions, can check a system to see if it meets the prereqs for an Agent, Proxy, or Enterprise Controller installation. To check a system, you can download the OCDoctor from http://java.net/projects/oc-doctor/downloads, unpack it on the target system, and run it with the --agent-prereq option. This will tell you what (if anything) needs to be done so that the system can support an Agent.

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This blog discusses issues encountered in Ops Center and highlights the ways in which the documentation can help you

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