There are several options for installing Process Services and its associated applications.
The applications available to deploy are:
- Process Services
- Process Services Administrator
- Process Workspace
The following methods are available to deploy Process Services:
Installing Process Services using containers introduces a number of concepts.
You can start Process Services from a number of Docker images. These images are available in the repositories Docker Hub and Quay. However, starting individual Docker containers based on these images, and configuring them to work together might not be the most productive way to get up and running.
There are Helm charts available to deploy Process Services in a Kubernetes cluster, for example, on Amazon Web Services (AWS). These charts are a deployment template which can be used as the basis for your specific deployment needs. The Helm charts are undergoing continual development and improvement and should not be used “as-is” for a production deployment, but should help you save time and effort deploying Process Services for your organization.
The following is a list of concepts and technologies that you’ll need to understand as part of installing Process Services using containers. If you know all about Docker, then you can skip this part.
Virtual Machine Monitor (Hypervisor)
A Hypervisor is used to run other OS instances on your local host machine. Typically it’s used to run a different OS on your machine, such as Windows on a Mac. When you run another OS on your host it is called a guest OS, and it runs in a Virtual Machine (VM).
An image is a number of layers that can be used to instantiate a container. This could be, for example, Java and Apache Tomcat. You can find all kinds of Docker images on the public repository Docker Hub. There are also private image repositories (for things like commercial enterprise images), such as the one Alfresco uses called Quay.
An instance of an image is called a container. If you start this image, you have a running container of this image. You can have many running containers of the same image.
Docker is one of the most popular container platforms. Docker provides functionality for deploying and running applications in containers based on images.
A Dockerfile is a script containing a successive series of instructions, directions, and commands which are run to form a new Docker image. Each command translates to a new layer in the image, forming the end product. The Dockerfile replaces the process of doing everything manually and repeatedly. When a Dockerfile finishes building, the end result is a new image, which you can use to start a new Docker container.
Difference between containers and virtual machines
It’s important to understand the difference between using containers and using VMs. Here’s a picture from What is a Container - Docker:
The main difference is that when you run a container, you are not starting a complete new OS instance. This makes containers much more lightweight and quicker to start. A container also takes up much less space on your hard-disk as it doesn’t have to ship the whole OS.