Set up a Container Native Deployment with Oracle Container PipelinesGepubliceerd: Auteur: Michel Schildmeijer Categorie: Oracle
In this surrealistic time of the COVID 19 virus, a lot of conferences where I was going to speak this year were cancelled, so I decided to write my presentation in the form of an article. Not sure if I’m able to tell this story somewhere in the world this year, so here it is! This blog is also available on Oracle.com.
Delivering high quality software in a 24*7 environment is a challenge for a lot of teams these days. Teams of multinationals need to deliver more functionality more quickly. Some of these teams are able to deliver new software every hour. How is it possible to meet these demands?
You must have heard the term many times these days. Maybe you already work like this in your team. Anyway, methods of working are changing rapidly, and the DevOps’s way of working is the way a lot of teams aim towards. Either to start with or to improve their own way of working and meet the high demands of their clients, business teams or goals set by their company.
Other ways of Development & Operations
Besides the methods of working, teams are also facing new technologies and innovations of how to develop, build, deploy, operate and monitor applications. A lot of companies these days shift from on-premises to “Cloud Native” applications. This means, for instance, that a build pipeline of an application might look a little different from traditional applications. Also take into consideration that the application landscape is being redesigned into a (partially) microservices or serverless landscape, supported by container-native platforms and private or commercial cloud vendors.
DevOps challenges – the “Ops” in DevOps
I won’t go through all aspects of DevOps, but one challenge DevOps teams face is the Ops part of it. These are business critical applications, that don’t allow any downtime or performance loss. A lot of teams are not well focused on the Ops part. This leads to error rates of applications being high: 32% of production apps have problems and even worse: that are often only discovered when they are reported by customers.
There are several reasons for this to happen:
- Lack of continuity and/or automation
- Lack of visibility
To become more successful in DevOps, Forrester developed a model for DevOps teams, to help them achieve their goals. The so-called CALMMS model:
This whitepaper will focus on the technology part, which supports certain highlighted aspects of the CALMSS model, especially the “Oracle way” of how to interpret these. The last few years, Oracle has done the major job of adopting and keeping up Cloud Native technologies and embedding them in their current cloud offerings, which will be discussed in the coming part.
Solutions for Cloud Native Deployments
Through the years, the industry has developed some solutions for automating deployments as much as possible, in line with the DevOps way of working.
Oracle Container Pipeline – A Cloud Native Container Pipeline
To meet a high level of automation, it is essential to automate your software delivery from development to operations. Specially for in the cloud, Oracle has some technologies to support this. The ingredients you may need are the following: Versioning & Container Registry, Containers & Orchestration Engine, Provisioning, Container Pipelines and Packaging & Deployments. Having these ingredients will enable your team to meet a higher level of delivering, because less manual work needs to be done when it’s implemented. Of course, the implementation itself takes time and investment, but it will become beneficial later, when you are up to speed with it.
Versioning & Container Registry
For setting up a continuous, and in this case a container pipeline, you need a mechanism to version you source code and register your application containers in a registry. There are various source code repositories:
- Git (commonly used with GitHub)
The most common is GitHub. There are even movements to let GitHub be the “source of truth” and implement a GitOps methodology. With this, you declaratively describe the entire desired state of your system in Git. Everything is controlled and automated with YAMLs and pull requests. Container registries are used to store container images created during the application development process. Container images placed in the registry can be used during application development. Companies often use a public registry, but it is recommended to have private registry. Within the Oracle Cloud, you can set up your own private registry, with benefits like high availability and maintenance.
Set up your private container registry at Oracle Cloud Infrastructure
To be able to push and pull your containers to a private OCI registry, the following steps need to be applied:
- Set up an auth token in your Cloud Console
- From your OCI client, log into your OCI registry with the docker interface (fra is the Frankfurt region)
- docker login fra.ocir.io
Credentials to be filled in. You can find your user details in your cloud user settings:
Then, you can either pull an image, or use your local build image and push it to your private registry. Tag the image for pushing.
- docker tag <docker hub name>/helloworld:latest
Region, tenancy etc. should apply to your own situation. And push.
- docker push
You can verify the push afterwards.
Containers & Orchestration Engine
From bare metal to virtualization to containerization. Containers have gained significant popularity the last few years. There are many container technologies to choose from, but there is a general lack of knowledge about the subtle differences in these technologies, and when to use what. Docker has become the most popular and more or less the de facto standard for container engines and runtime, though there are more, such as:
- CoreOS - Rocket
- Linux Containers (LXC). Docker was built on top of it.
- Kata containers
For a long time, since 1979, the technology for containers was already there, hidden in UNIX and later in Linux as chroot, where the root directory of a process and its children were isolated to a new location in the filesystem. This was the beginning of process isolation: segregating file access for each process.
So, some basic characteristics of containers are:
- Container: Configurable unit for small set of services/applications. Light weighted images
- Share the OS kernel – No hypervisor. Except for Kata Containers which has its own kernel
- Isolated resources (CPU, Memory, Storage)
- Application & Infrastructure software as a whole
In a container-based landscape, there can be a large number of containers, which leads to questions such as: How to manage and structure these? An orchestration platform can be the solution. Kubernetes is such a platform. It manages storage, compute resources, networking where “Infrastructure as code” is the way for lifecycle management. The orchestration platforms present these days are:
- Docker Swarm
- Kubernetes, on premises or Cloud Engines by Microsoft (AKE), Google (GKE), IBM/RedHat, Amazon and Oracle (OKE)
- Red Hat OpenShift
Kubernetes might now be considered as a standard platform and adopted technology to orchestrate containers. Once initiated as an internal project at Google, Kubernetes is now a framework for building distributed platforms. It manages and orchestrates container processes. It takes care of the lifecycle management of runtime containers.
Some of the basic concepts of Kubernetes are:
- Master: Controls Kubernetes nodes.
- Node: Perform requested, assigned tasks by the master
- Pod: Scheduler entity for a group of one or more containers
- Replication controller: Control of identical pods across a cluster.
- Service: Work definitions and connection between containers and pods.
- kubelet: Reads container manifests to watch containers’ lifecycles
- kubectl: command line configuration tool for Kubernetes
- etcd: Key – Value store holding all Cluster Configs
It’s important to provision your “Infrastructure as Code”. Now, every Cloud vendor has a portal where you can set up a Kubernetes Cluster in minute, but when you want to do it repeatedly and more automated, it’s recommended to use the Terraform Provider. Terraform is a tool to provision Cloud environments. These scripts can be easily integrated in your container pipeline, as seen in this whitepaper. For a detailed setup of Terraform, look at: http://https://community.oracle.com/blogs/mnemonic/2018/09/23/oracle-kubernetes-engine-setup-fast-with-terraform
Packaging & Deployments
In the Opensource community, it’s all about adoption. If there is a fine technology or good initiative, it will be embraced and finally become some sort of a standard. Speaking of packaging and deployment, Helm has become a widely used tool for doing this. It’s a Release and Package Management tool for Kubernetes and can be integrated with CI build tools (Maven, Jenkins, and Wercker)
This is a simple setup of the Helm components
Helm workflow according to V3
Setting up a Cloud Native Container pipeline can be done with different technologies. There are a lot of Opensource technologies to facilitate this. A few well known are:
- JenkinsX and Tekton: you could run the default Jenkins in the cloud, but JenkinsX and Tekton are cloud native
- Knative, Originated by Google
- K8S-native OSS framework for creating (CI/CD) systems
- Spinnaker: an open source, multi-cloud continuous delivery platform initiated in 2014 by Netflix
- OpenShift Pipelines
- Azure DevOps Pipelines
- Oracle Container Pipelines (Wercker): a Docker and Kubernetes native CI CD platform for Kubernetes and Microservices Deployment
- Former Wercker, acquired by Oracle
- Partial Open Source (the CLI)
Melting this all together in: Oracle Container Pipelines
Oracle Container Pipelines is fully web based and integrated with tools like GitHub/lab or Bitbucket. It contains all the build workflows, and has dependencies, environment settings and permissions. Before Oracle acquired it, it was called Wercker. It is a Container-native Open Source CI/CD Automation platform for Kubernetes & Microservice Deployments. Every Artifact can be a packaged Docker Container.
In the base, it is a CI/CD tool designed specifically for container development. It’s pretty much codeless, meant to work with containers, to be used with any stack in any environment. Its central concept is pipelines, which operate on code and artifacts to generate a container. A pipeline generates an artifact, which can be packaged into a container. The aim is to work directly with containers through the entire process, from Development to Operation. This means the code is containerized from the beginning, with a development environment that's almost the same as the production one.
Oracle Container Pipelines works with some of following characteristic:
- This is the team, group or department grouped together to work on a certain project, as a unit in Wercker. It hosts applications, and users can be part of one or more Organizations.
- This contains the build workflows and consist of dependencies, environment configuration and permissions. Applications are linked to a versioning system, usually to a project on Github, Gitlab, or Bitbucket, or your own SCN.
- Stages in the pipeline with an Isolated script or compiled binary for accomplishing specific automation tasks.
- Such as install, build, configure, test. You can add an npm-install, maven build or a python script to test your build.
- Or a Docker action (Push, Pull etc.).
- Pipelines (pipeline consists of steps)
- A series of steps that are triggered on a Git push, or the completion of another pipeline. This is more or less a GitOps approach example of a pipeline with the build of a container, push to the registry and deploy to a Kubernetes Cluster (OKE)
- Workflows is a set of chained branched pipelines to form multi-stage, multi-branch complex CI/CD flows. These are configured in the Web UI and depend on the wercker.yaml where the pipelines are configured, but they are not part of that yaml. Variations are based on branch.
- Workflows can be executed in parallel. werker.yaml: the central file that must be on the root of your Git repository, and defines the build of your application using the steps and pipelines you configured in Wercker
Configure Wercker for OKE
To be able to deploy applications to your managed Kubernetes Engine, you need to set some configuration Items on the configuration tab of your Wercker Application, in order to access your OKE:
Blend in Helm and Terraform in your Wercker Workflow
Building an entire Oracle Kubernetes Engine and deployment of your applications can be achieved by creating pipelines that consists of all the necessary steps, such as:
- Use a lightweight image for the build
- Performing all the steps needed: Terraform commands, Helm commands, specific kubectl commands or scripts
- Configurations for API keys (in case of Terraform build of OKE), OCI and Kubernetes details
Set up a temp Terraform box
Provision Kubernetes OKE cluster
The Helm steps are basically the same as the other steps:
- Push a build container image to your Container Registry
- Set up a temp box for Helm install
- Fetch Helm repo and generate charts for install your application container
Example of the running pipeline
These are more or less the steps to take in order to set up a container-based pipeline where you:
- Provision Infrastructure with Terraform
- Do Helm initialization and repository Fetch
- Install application containers with Helm
Wercker (or Oracle Container Pipelines) is, in my opinion, a good option for your containerized pipelines, with lots of options for different methods and technologies. It requires some work to set up, but components can be integrated on different kind of levels.
To me, it is currently unclear how this will evolve, especially with other more well-known platforms such as Jenkins-X and Tekton. I will closely follow the different solutions!