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Oracle Cloud Infrastructure (OCI) and Terraform : First Steps

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We’ve got some stuff going on at work using Terraform, or Terrahawks as I like to call it, so I figured it was about time I had a play with it. I probably won’t be doing much of the project work myself, but I like to understand a bit about all the things we do.

Oracle DB on Azure with Multitenant Option

By Franck Pachot

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If you want to run an Oracle Database in the Microsoft Azure cloud, you will install it yourself on a VM. And then, you can expect the same as when you install it in your premises, in a virtual environment. Except that Oracle makes it two times more expensive by accepting to license the processor metric on vCPUs at the condition that the Intel core factor is not applied. And in addition to that there is a weird limitation on multitenant. I create a VM with the 19c image provided by Azure. I’m not sure there’s a big advantage to have this image. You have an Oracle Linux OS, with all prerequisites (which is like having installed the preinstall rpm), and a 19.3 Oracle Home (which is like downloading it, unzip and runInstaller). But you will still have to apply the latest Release Update and create a database.

Ansible tips’n’tricks: run select parts of a playbook using tags

I have recently re-discovered an Ansible feature I haven’t used in a while: tagging. Ansible allows you to define tags at various places of your playbook. On its own that wouldn’t be terribly useful, except that you can pass tags to ansible-playbook causing the interpreter to selectively run tasks tagged appropriately.

My example uses Ansible 2.9.6+dfsg-1 as it was provided by Ubuntu 20.04 LTS.

Tagging Ansible tasks

Here is the code of my somewhat over-simplified playbook for this blog post:

Terraform tips’n’tricks: debugging data sources and testing interpolations

I have previously blogged about the use of Terraform data sources to fetch information concerning Oracle Cloud Infrastructure (OCI) resources. The documentation is pretty good, but sometimes you may want to know more about the data returned. This post describes a potential way to debug output of a data source and to evaluate interpolations.

Do you know Data::Dumper?

Perl is one of the programming languages I have worked with in the past. When I did (it really was a long time ago) there wasn’t a proper IDE allowing me to have nice breakpoints and inspect variables so I resorted to the good, old Data::Dumper. It worked pretty much everywhere and showed me the contents of complex data structures when I was a bit at a loss. For example:

Terraform tips’n’tricks: getting the latest Oracle Linux 8 image OCID programatically

This post is a direct follow up to the previous one where I shared how I used a Terraform data source to fetch the latest Oracle-provided Oracle Linux 7 cloud image identifier. This time around I’d like to fetch the latest Oracle Cloud ID (OCID) for Oracle Linux 8. It’s a different approach and instead of a single article covering both Oracle Linux versions I decided to use a more the search-engine friendly method of splitting the topics.

Terraform versions

I’m still using Terraform 0.14.5/OCI provider 4.10.0.

Terraform tips’n’tricks: getting the latest Oracle Linux 7 image OCID programatically

As with all cloud providers you need to specify an operating system image when creating virtual machines using Terraform in Oracle Cloud Infrastructure (OCI). This can either be an Oracle supplied image, or a custom image you built. This post describes how to fetch the most recent Oracle-provided image for Oracle Linux 7 in Terraform. I am planning another post for Oracle Linux 8 in the future.

Terraform versions

When writing this post Terraform 0.14.5 was the latest and greatest release. The terraform init command downloaded release 4.10.0 of the OCI provider.

Google Spanner – SQL compatibility

By Franck Pachot

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I have posted, a long time ago, about Google Spanner (inserting data and no decimal numeric data types) but many things have changed in this area. There is now a NUMERIC data type and many things have improved in this distributed SQL database, improving a bit the SQL compatibility.

CockroachDB troubleshooting series… define the process

After working with customers for about 18 months now, I am starting a blog series to write up the common issues seen while running CockroachDB. Diagnosis and treatment of issues when running on distributed database architectures like CockroachDB, closely mirror the process used in the medical community.

There are observed symptoms which leads to a diagnosis and finally a treatment to resolve the condition. Good troubleshooting methodology can help frame the problem which leads to better overall outcomes. This process is outlined below:

Amazon Aurora: calling a lambda from a trigger

By Franck Pachot

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You may want your RDS database to interact with other AWS services. For example, send a notification on a business or administration situation, with a “push” method rather than a “pull” one from a Cloud watch alert. You may even design this call to be triggered on database changes. And Amazon Aurora provides this possibility by running a lambda from the database through calling mysql.lambda_async() from a MySQL trigger. This is an interesting feature but I think that it is critical to understand how it works in order to use it correctly.