Install and configure CMAN 19c in the Oracle Cloud, step by step

Installing and configuring CMAN is a trivial activity, but having the steps in one place is better than reinventing the wheel.

Prepare for the install

Download the Oracle Client 19.3.0.0 in the Oracle Database 19c download page.

Choose this one: LINUX.X64_193000_client.zip (64-bit) (1,134,912,540 bytes) , not the one named “LINUX.X64_193000_client_home.zip” because it is a preinstalled home that does not contain the CMAN tools.

Access the OCI Console and create a new Compute instance. The default  configuration is OK, just make sure that it is Oracle Linux 7 🙂

Do not forget to add your SSH Public Key to access the VM via SSH!

Access the VM using

Copy the Oracle Client zip in /tmp using your favorite scp program.

Install CMAN

Follow these steps to install CMAN:

 

Basic configuration

This will create a CMAN configuration named cman-test. Beware that it is very basic and insecure. Please read the CMAN documentation if you want something more secure or sophisticated.

The advantage of having the TNS_ADMIN outside the Oracle Home is that if you need to patch CMAN, you can do it out-of-place without the need to copy the configuration files somewhere else.

The advantage of using IFILE inside cman.ora, is that you can manage easily different CMAN configurations in the same host without editing directly cman.ora, with the risk of messing it up.

Preparing the start/stop script

Create a file /u01/app/oracle/scripts/cman_service.sh with this content:

This is at the same time ORACLE_HOME agnostic and configuration agnostic.

Make it executable:

and try to start CMAN:

Stop should work as well:

Add the service in systemctl

Open firewall ports

By default, new OL7 images use firewalld. Just open the port 1521 from the public zone:

 

Bonus: have a smart environment!

Ludo

Oracle Grid Infrastructure 19c does not configure the local-mode automaton by default. How to add it?

I have been installing Grid Infrastructure 18c for a while, then switched to 19c when it became GA.

At the beginning I have been overly enthusiast by the shorter installation time:

The GIMR is now optional, that means that deciding to install it is a choice of the customer, and a customer might like to keep it or not, depending on its practices.

Not having the GIMR by default means not having the local-mode automaton. This is also not a problem at all. The default configuration is good for most customers and works really well.

This new simplified configuration reduces some maintenance effort at the beginning, but personally I use a lot the local-mode automaton for out-of-place patching of Grid Infrastructure (read my blog posts to know why I really love the local-mode automaton), so it is something that I definitely need in my clusters.

A choice that makes sense for Oracle and most customers

Oracle vision regarding Grid Infrastructure consists of a central management of clusters, using the Oracle Domain Services Cluster. In this kind of deployment, the Management Repository, TFA, and many other services, are centralized. All the clusters use those services remotely instead of having them configured locally. The local-mode automaton is no exception: the full, enterprise-grade version of Fleet Patching and Provisioning (FPP, formerly Rapid home provisioning or RHP) allows much more than just out-of-place patching of Grid Infrastructure, so it makes perfectly sense to avoid those configurations everywhere, if you use a Domain Cluster architecture. Read more here.

Again, as I said many times in the past, doing out-of-place patching is the best approach in my opinion, but if you keep doing in-place patching, not having the local-mode automaton is not a problem at all and the default behavior in 19c is a good thing for you.

I need local-mode automaton on 19c, what I need to do at install time?

If you have many clusters, you are not installing them by hand with the graphic interface (hopefully!). In the responseFile for 19c Grid Infrastructure installation, this is all you need to change comparing to a 18c:

as you can see, also Flex ASM is not part of the game by default in 19c.

Once you specify in the responseFile that you want GIMR, then the local-mode automaton is installed  as well by default.

I installed GI 19c without GIMR and local-mode automaton. How can I add them to my new cluster?

First, recreate the empty MGMTDB CDB by hand:

Then, configure the PDB for the cluster. Pay attention to the -local switch that is not documented (or at least it does not appear in the inline help):

After that, you might check that you have the PDB for your cluster inside the MGMTDB, I’ll skip this step.

Before creating the rhpserver (local-mode automaton resource), we need the volume and filesystem to make it work (read here for more information).

The volume:

The filesystem:

Finally, create the local-mode automaton resource:

Again, note that there is a -local switch that is not documented. Specifying it will create the resource as a local-mode automaton and not as a full FPP Server (or RHP Server, damn, this change of name gets me mad when I write blog posts about it 🙂 ).

HTH

Ludovico