Monday Oct 28, 2013

EM CLI, diving in and beyond!

Doing more in less time… Isn’t that what we all strive to do?

With this in mind, I put together two screen watches on Oracle Enterprise Manager 12c command line interface, or EM CLI as it is also known.

There is a wealth of information on any topic that you choose to read about, from manual pages to coding documents…might I even say blog posts? In our busy lives it is so nice to just sit back with a short video, watch and learn enough to dive in.

Doing more in less time, is the essence of EM CLI. It enables you to script fundamental and complex administrative tasks in an elegant way, thanks to the Jython scripting language. Repetitive tasks can be scripted and reused again and again. Sure, a Graphical User Interface provides a more intuitive step by step approach to tasks, and it provides a way of quickly becoming familiar with a product and its many features, and it is definitely the way to go when viewing performance data and historical trending…but for repetitive and complex tasks, scripting is the way to go!

Lets us take the everyday task of creating an administrator.

Using EM CLI in interactive mode the command could look like this..

emcli>create_user(name='jan.doe', type='EXTERNAL_USER')

This command creates an administrator called jan.doe which is an externally authenticated user, possibly LDAP or SSO, defined by the EXTERNAL_USER tag. The create_user procedure takes many arguments; see the documentation for more information.

Now, where EM CLI really shines and shows power is in creating multiple users. Regardless of the number, tens or thousands, the effort is the same. With the use of a standard programming construct, a loop, you can place your create_user() procedure within it. Using a loop allows you to iterate through a previously created list, creating new users until the list is complete.

Using EM CLI in Script mode, your Jython loop would look something like this…

for user in list_of_users:

      create_user(name=user, expire=’true’, password=’welcome123’) 

This Jython code snippet iterates through a previously defined list of names, list_of_users, and iterates through the list, taking each name, user in this case, and creates an administrator sets the password to welcome123, but forces the user to reset it when they first login.

This is only one of over four hundred procedures created to expose Oracle Enterprise Manager 12c functionality in a powerful and programmatic way.

It is a few months since we released EM CLI with scripting option. We are seeing many users adapt to this fun and powerful way of using Oracle Enterprise Manager 12c.

What are the first steps?

Watch these screen watches, and dive in.

The first screen watch steps you through where and how to download and install and how to run your first few commands.


The Second screen watch steps you through a few scripts.

Next time, I am going to show you the basic building blocks to writing a Jython script to perform Oracle Enterprise Manager 12c administrative tasks.

Join this growing group of EM CLI users…. Dive in!

Monday Aug 19, 2013

Simplified Agent and Plug-in Deployment

On your site of hundreds or thousands of hosts have you had to patch agents immediately as they get deployed?  For this reason I’ve always been a big fan of cloning an agent that has the required plug-ins and all the recommended core agent and plug-in patches, then using that clone for all new agent deployments. With EM 12c this got even easier as you can now clone the agent using the console “Add Host” method. You still have to rely on the EM users to use the clone. The one problem I have with cloning is that you have to have a reference target for each platform that you support. If you have a consolidated environment and only have Linux x64, this may not be a problem. If you are managing a typical data center with a mixture of platforms, it can become quite the maintenance nightmare just to maintain your golden images. You must update golden image agents whenever you get a new patch (generic or platform specific) for the agent or plug-in, and recreate the clone for each platform. Typically, I find people create a clone for their most common platforms, and forget about the rest. That means, maybe 80% of their agents meet their standard patch requirements and plug-ins upon deployment, but the other 20% have to be patched post-deploy, or worse – never get patched!

While deployed agents and plug-ins can be patched easily using EM Patches & Updates, but what about the agents still getting deployed or upgraded? Wouldn’t it be nice if they got patched as part of the deployment or upgrade? This article will show you two new features in EM 12.1.0.3 (12cR3) that will help you deploy the most current agent and plug-in versions. Whether you have 100s or 1000s of agents to manage, reducing maintenance and keeping the agents up to date is an important task, and being able to deploy or upgrade to a fully patched agent will save you a lot of time and effort.

[Read More]
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