![]() ![]() The benefits of containerization include better collaboration, cost-effectiveness, mobility, and the ability to test/deploy an application quickly. In an empty directory, create the following as hello.go: package mainįunc HelloWebServer(w http.ResponseWriter, r *http.Docker Containers have helped developers in many ways. ![]() Building the image without Koįor this example, we will build the classic Go tutorial application, the “Hello World” web app.ġ. To describe how Ko addresses the above-listed challenges, let’s first look at an example of how it compares to existing Go + Docker build steps. Ko aims to address each of these areas while providing a superior experience to the developers using it. On the other hand, introducing new build tools can be complex and increase the learning curve for those in charge of the build systems. Container Security by Liz Rice, Chapter 6 Without additional security tooling, any user who can trigger a docker build on this machine can also perform a docker run to execute any command they like on the machine… Not only can they run any command they like, but also, if they use this privilege to perform a malicious action, it will be hard to track down who was responsible.” “ daemon… has a lot more capabilities beyond building and interacting with registries. For example, the practice of exposing the Docker engine - or the host machine’s docker.sock - to a CI build node can give build environments elevated access levels on those nodes. Security teams also care greatly about what goes into an image and the tooling used to construct it. Are there standard annotations I need to include per my organization’s requirements?Īpplication architects and leads also want to make governance and standards implementation easy for their teams to follow, but maintaining uniform practices can be challenging when every team has unique and organically crafted Dockerfile patterns.What tooling do I need to learn to build the image? (Docker? Buildah? BuildKit?).How much of my app should I copy into the image to run my application?.How do I best combine commands to minimize layer bloat?.Which base image should I use, and is it compliant with my organization’s policies?.Many programmers, regardless of the language they work with, are new to container construction and often have a lot of questions about image building such as: Ko also has a few additional tricks up its sleeve related to software bill of materials (SBOM) construction as well as Kubernetes integration to help make iterative development and deployment processes super simple. Like Jib, Ko will push the image to a registry or drop it into your local Docker image cache, depending on how you configure and/or run it. In addition to compiling your application, it will also generate an ultra slimmed-down container image that has your application installed in it. Ko is a single binary, command line tool that is designed to be used in your development process in place of where you run the go compiler today. In this article, we’ll look at using Ko to build container images without Dockerfiles, SBOMs, and integrating with Kubernetes. ![]() Congratulations to the Ko project for the success that merited this migration! We have updated verbiage in this post to reflect this but references to “Google Ko” may still be found online and in module names for a while, be assured that this is the same project. Note: During the drafting of this article, the Ko project was migrated from a Google owned GitHub repository to it’s own top-level organization, “ ko-build“. What if you are building Go applications, though? Well, there is another open source tool for Go that works similarly called Ko. Jib builds slim, JVM-based, OCI-compliant images that follow best practice guidelines without the need for a container runtime like Docker, and it removes the need to write and manage Dockerfiles. In a previous article, I wrote about how - and why - you might want to use the Google Open Source group’s Jib tool to build your Java application container images. ![]()
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