Using Apache Karaf with Docker
Hi everyone, I have a dilemma which I'll present to you here. Any advice/indications? Case 1. I have a production system in which I have multiple virtual machines. In every such virtual machine I run an Apache Karaf instance. In all this Apache Karaf instances (one per virtual machine) I run multiple applications (deployed as OSGI bundles). Case 2. I have a production system in which I have multiple virtual machines. In every such virtual machine I run an Apache Karaf instance. In all this Apache Karaf instances (one per virtual machine) I run only one application (deployed as OSGI bundles). N.B. The only difference between Case 1 and Case 2 is that in case 1 I have multiple OSGI bundles in Karaf, while in case 2 I have only one OSGI bundle in Karaf (along the libraries). Question: Is it OK for case 1 or case 2 to be dockerized? This means, instead of running multiple VMs, I'll run multiple docker containers. Thanks, Andrei Mura
Re: Using Apache Karaf with Docker
Hi Andrei, Both cases work with Docker, maybe case 1 is "more" interesting (but it depends of your provisioning scenario). Regards JB On 13/01/2022 11:19, Andrei Petru Mura wrote: Hi everyone, I have a dilemma which I'll present to you here. Any advice/indications? Case 1. I have a production system in which I have multiple virtual machines. In every such virtual machine I run an Apache Karaf instance. In all this Apache Karaf instances (one per virtual machine) I run multiple applications (deployed as OSGI bundles). Case 2. I have a production system in which I have multiple virtual machines. In every such virtual machine I run an Apache Karaf instance. In all this Apache Karaf instances (one per virtual machine) I run only one application (deployed as OSGI bundles). N.B. The only difference between Case 1 and Case 2 is that in case 1 I have multiple OSGI bundles in Karaf, while in case 2 I have only one OSGI bundle in Karaf (along the libraries). Question: Is it OK for case 1 or case 2 to be dockerized? This means, instead of running multiple VMs, I'll run multiple docker containers. Thanks, Andrei Mura
Re: Using Apache Karaf with Docker
> Jean-Baptiste Onofré : > Both cases work with Docker, maybe case 1 is "more" interesting (but > it depends of your provisioning scenario). @Andrei, as JB hints at there are many ways to dockerize karaf applications. My applications are provisioned by creating karaf features and deploy OSGi bundles and karaf features to a maven repository, and then load the features in karaf. So for docker, what I've done is to start with the standard karaf docker image deployed to dockerhub, and then override the file etc/org.apache.karaf.features.cfg in the karaf installation in the docker image, with a file that loads the LATEST version my feature(s). I also deploy versions of the JDBC Config files of my application, that can have the URL and USERNAME/PASSWORD values set from environment variables, making them easy to set in the deploy. That means that when I deploy my image it can provision from the newest deploy to maven, without me having to build a new docker image. Here's an example of a maven module that builds a docker image on top of the standard karaf docker image: https://github.com/steinarb/sonar-collector/tree/master/docker Caveat emptor! I haven't run this for a while so it may not be working right now (I probably have to update the docker image version to a newer karaf version). FWIW My deployment model is to have a single karaf instance in my VPS, deploying all of my applications as OSGi bundles. Works like a charm for me!
