Decentralized Integration – IBM App Connect Enterprise on IBM Cloud Private with DevOps
In an article written earlier in 2018 I explored â€śfoundational” approaches to running IBM Middleware on IBM Cloud Private Kubernetes clusters.
In this new article and its associated collateral we will explore a more cloud native, â€ścomponentized/decentralizedâ€ť approach that demonstrates how to deliver integration with the App Connect Enterprise product on IBM Cloud private to microservices principles.
We will leverage a base App Connect Enterprise (ACE) v18.104.22.168 image that has a fixed configuration and deliver integration microservices â€śfromâ€ť that image. These integration microservices perform a single integration function, are immutable and individually scalable. The two integration microservices are simplistic but designed to work together as a simple microservices application.
The ICP Cloud represents an environment that exists in the standard Software Delivery Life Cycle (could be SIT, QA, Perf, Prod (or potentially one of those environments in an ICP cluster namespace).
We are delivering a microservices application consisting of multiple microservices, two of which have requirements that are integration-centric and ACE has been chosen as the runtime for these functions.
Our fictitious organization maintains a standard operating environment (container image) for microservice integration with a fixed configuration component on top of which the integration microservices are added and then the images deployed and run as a Helm release.
The primary mechanism for deployment will be Jenkins but we’ll use Microclimate, as it sorts out security on the ICP instance for us, and stands up the Jenkins toolchains.
The Personas â€“ the team delivering our micro services application
- Developer 1 and Developer 2 have their own ACE Enterprise Toolkits and workspaces and are integration developers. They write ACE services and flows and build BAR files.
- One or more Build Specialists are responsible for maintaining the SOE image and building integration microservices images from the SOE image based on the BAR files created by the Developers.
- One or more Deployment Specialists are responsible for packaging and deployment of microservices applications that can include integration microservices. They use Helm and the ICP Devops tooling and pipelines to deploy.
This article is in an early form and I plan to update it with a greater level of detail.
There is more detail on how the ACE integration microservices and the ACE Liveliness probe work along with many screen captures of the final solution on ICP 3.1 in the Supporting Materials and documentation on GitHub: https://github.com/DAVEXACOM/ACEonICPIntSupportingMaterial.
The ACE Integration microservices
The Integration Micro Service 1 exposes a RESTFul (API) interface. This service will call Integration Micro Service 2 via itâ€™s RestFul(API) interface
- Integration Micro Service 1
RESTInput(HTTP) -> Mapping Node -> RESTRequest (call Integration Microservice 2) -> RESTReply(HTTP)
- Integration Micro Service 2
RESTInput(HTTP) -> Mapping Node Payload+"Hello from Integration Microservice 2" -> RESTReply(HTTP)
Integration Micro Service 2 simply returns a â€śHello Worldâ€ť style message. Integration Micro Service 2 can be called directly or through Integration Micro Service 1.
We have set up the integration in this way to position it for using Istio as a service mesh to route between integration micro services. However, in this initial example I will make use of the ICP DNS service that uses services names to resolve host names and port numbers. So the base URL on the RESTRequest Node in Micro Service 1 will call Micro Service 2 by its service name.
The ACE Liveliness Probe
Our ACE Liveliness Probe service is another Restful service that we deploy into the ACE standard operating environment image, the base image from which Integration Micro Service 1 and Integration Micro Service 2 images are built. So it appears in all ACE Integration Micro Services. (this is not the service baked into the IBM cloud paks, we turn those off to demonstrate having a customer-centric base standard operating environment (SOE) image.
The Docker images
The ACE standard operating environment image is built from:
- ACE v22.214.171.124
- IBM MQ v9.1 Client (not used in these scenarios)
- Fixed configuration – a BAR file with RESTful Service, a custom Liveliness Listener
The ACE integration microservices images build from this (base) SOE image.
Before you start â€“ Jenkins Build Script customization on ICP
When using Microclimate and Jenkins we have found it best to customize the Jenkins build scripts (instead of using the Microclimate/Jenkins set up that is more aligned to Java and NodeJS microservices).
We made changes to the Jenkins pipeline scripts to get greater flexibility in the image build, deploy only, and image build and deploy. This allowed us greater control in demoing these scenarios. The instructions can be found here: https://github.com/cloudnativedemo/icp-notes/blob/master/microclimate_notes.md
Testing and Demoing
I have included a word document that contains instructions on how to perform the following tasks:
- Orientation of the SoE Image collateral and Build of the SoE
- Orientation of the Microservice 1 Image collateral and Helm chart for Build and Deploy of Micro Service 1 standalone.
- Orientation of the Microservice 2 Image collateral and Helm chart for Build and Deploy of Micro Service 2 standalone.
- Microservice 2 Testing.
- Orientation of the Helm Chart for packaging and deployment of the microservices application (Microservice 1 and 2).
- Testing the Microservices application (Microservice 1 and 2).
Documentation for using the collateral: https://github.com/DAVEXACOM/ACEonICPIntSupportingMaterial/blob/master/documentation/ACEonICPIntMicroServices.docx
As mentioned up front, I do plan to add a lot more detail on the process of building out this â€śintegration to micro services principles solutionâ€ť. However, with the scenario up, running, and proven, and the materials all publicly available, I wanted to make those materials available to the developer community that are already exploring ACE, Docker, and Kubernetes. See the supporting materials ACEonICPIntMicroService.docx for more detail.
Supporting Materials and documentation: https://github.com/DAVEXACOM/ACEonICPIntSupportingMaterial
Iâ€™d like to acknowledge Do Nguyen and Peter Jessup of the IBM Australia Hybrid Cloud Integration Technical Sales team for their excellent technical work in helping to produce these materials.
Summary of the GitHub repository collateral
The collateral is all available from the DAVEXACOM organization: https://github.com/DAVEXACOM
- ACE Developer Project source for a custom Liveliness probe: https://github.com/DAVEXACOM/ACEonICPIntMicSoE
- ACE Developer Project source for Integration Micro Service 1: https://github.com/DAVEXACOM/ACEonICPIntMicSrv1
- ACE Developer Project source for Integration Micro Service 2: https://github.com/DAVEXACOM/ACEonICPIntMicSrv2
- ACE Standard Operating Environment image build: https://github.com/DAVEXACOM/ACEonICPIntStdOpImg
- ACE Micro Service 1 image build: https://github.com/DAVEXACOM/ACEonICPIntMicSrv1Img
- ACE Micro Service 2 image build: https://github.com/DAVEXACOM/ACEonICPIntMicSrv2Img
- ACE Micro Service 1 or 2 deploy by Helm Charts as an individual service for testing (modify Jenkins file and Values.yaml to toggle between deployments): https://github.com/DAVEXACOM/ACEonICPIntMicSrvHelm
- ACE Micro Service 1 AND 2 deploy via Helm Charts as a micro services application: https://github.com/DAVEXACOM/ACEonICPIntMicSrvApplHelm
- Testing and demoing documentation for the above is here: https://github.com/DAVEXACOM/ACEonICPIntSupportingMaterial
Summary of the Docker Hub collateral
The Docker Hub collateral is all available from the DAVEXACOM organization: https://cloud.docker.com/u/davexacom/repository/list.
- ACE Developer image for ACE v126.96.36.199 Standard Operating image on which all other images are based: https://cloud.docker.com/u/davexacom/repository/docker/davexacom/ace11002mqc91soe
- ACE Developer image for ACE v188.8.131.52 Integration Micro Service 1: https://cloud.docker.com/u/davexacom/repository/docker/davexacom/ace11002mqc91intms1
- ACE Developer image for ACE v184.108.40.206 Integration Micro Service 2: https://cloud.docker.com/u/davexacom/repository/docker/davexacom/ace11002mqc91intms2
You can use the Docker Hub images with ICP rather than the on board repository OR pull them to you workstations and play around with them in a docker only (non K8s) environment.