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#Containerization

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Containerization is a lightweight alternative to full machine virtualization that involves encapsulating an application in a container with its own operating environment. 

Article
· Feb 24 2m read
The bewitched line terminator

I want to address the nasty problems about reading a flat text in ASCII, UTF*
explicitly excluding HTML, EBCDIC, and other encoding.
According to Wikipedia there are at least 8 variations of control characters.

  • CR+LF is typical for Windows
  • LF is typical for the Linux/UNIX world
  • CR is Mac's favorite

As you can deduct from the names the inspiration comes from mechanical typewriters.

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Article
· Mar 25 7m read
Introduction to Kubernetes

In this article, we will cover below topics:

  • What is Kubernetes?
  • Main Kubernetes (K8s) Components


What is Kubernetes?

Kubernetes is an open-source container orchestration framework developed by Google. In essence, it controls container speed and helps you manage applications consisting of multiple containers. Additionally, it allows you to operate them in different environments, e.g., physical machines, virtual machines, Cloud environments, or even hybrid deployment environments.

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Article
· Apr 30 3m read
mg_web for ObjectScript Developers

A few weeks ago I posted an announcement about a JavaScript-based interface for our mg_web WebServer interfacing addon module. mg_web isn't just restricted to use by JavaScript developers though. Many readers will be ObjectScript developers who are more used to using CSP as their web gateway. Some may even have much older legacy WebLink-based applications (and be wondering how to support them given that IRIS does not support WebLink).

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Article
· Jan 21 1m read
Debugging a crashing container

I have been struggling with a docker run command that kept crashing, the error message was too generic to point me to the right direction.

Since the container is shut down after the failure, I was unable to login to it in order to figure out the problem.

I had to run the container in a way that I'll be able to log into it before it crashed, so I found the adding -u false prevents the docker run command to run the iris session IRIS and the container stayed up and running. then I was able to log into it using:

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It's not clear to me, when using the InterSystems Container Repository, which version is the best / most recent non-preview Community Edition version to use.

I see lots of 2023.2.x versions, a single 2023.3 and 2024.1 version, but also a latest-cd and latest-em (with no explanation as to what cd and em mean).

I assume the trick is to use one of the latest-xx ones? If so, which?

Unfortunately I haven't been able to find any explanatory information anywhere about the nomenclature conventions used.

Many thanks

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Hey Community,

Play the new video on InterSystems Developers YouTube:

⏯ Container Lifecycle - When is Your App Ready to Accept Work @ Global Summit 2023

https://www.youtube.com/embed/hALbMzols9o
[This is an embedded link, but you cannot view embedded content directly on the site because you have declined the cookies necessary to access it. To view embedded content, you would need to accept all cookies in your Cookies Settings]

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Hi there, I'm wondering if anyone has run into an issue with <FILEFULL> when building an image from the ISC image? Specifically what's happening in our build is we are pre-loading our codebase into the image to make deployments faster and setting up source control, etc. When loading our libraries however we get hit with a <FILEFULL>. The resource limits on docker are pretty beefy and when observing resources on both the machine and container level we don't hit any issues. Oddly, this only happens when using the ARM64 version.

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Hi there,

I'm discovering IRIS and I need to POC the solution, with a constraint: containerization.
I'm used to deploy my apps in a Swarm cluster, and all my bind volumes are written on a GlusterFS volume.

The problem here, when I start my stack, the first log is:

[WARN] ISC_DATA_DIRECTORY is located on a mount of type 'fuse.glusterfs' which is not supported, consider a named volume for '/iris_conf'

And of course the deployment fails.

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I'm trying to get the python external language server started up in a container I am starting. The container is up and running but I cannot get the python language server to start.

This is the error that is coming back when trying to start the language server. I have tried creating a custom image with that package installed but it still does not work. Is there something specific that needs to be done to to get this working? (FYI, I have the dotnet version working but creating a custom image and installing the dotnet runtimes via a docker file)

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Contestant

The Istio Service Mesh is commonly used to monitor communication between services in applications. The "battle-tested" sidecar mode is its most common implementation. It will add a sidecar container to each pod you have in your namespace that has Istio sidecar injection enabled.

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Contestant
Article
· 5 hr ago 2m read
Minimum IRIS container footprint

Sometimes customers need a small IRIS instance to do something in the cloud and shut it down, or they need hundreds of containers (i.e. one per end user or one per interface) with small workloads. Other potential use case could come up when we are installing in small linux-based devices with not a lot of memory. This exercise came about to see how small an IRIS instance could be. Obviously, one can configure the amount of CPUs and Disk but for this exercise we focused on what is the smallest amount of memory we can configure for an IRIS instance.

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