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chore(doc): describe build strategies
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| = Incremental image | ||
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| One of the goal of Camel K is to provide a Cloud Native experience for Camel developers. It means basically to have a quick build of the application based on the Camel route you provide and an execution that should be as fast as possible. | ||
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| In order to reduce the time to build and execute an application we adopt various strategies. If an application has a container with all the dependencies required, then, we just reuse such container, having an immediate start of your application. And then we have the concept of **incremental image**. | ||
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| If you're familiar with Camel K architecture, you know that an Integration uses an IntegrationKit, which is, a reusable resource containing all the dependencies and capabilities required to run a certain "class" of Camel applications. The IntegrationKit is bound to a container image stored in a registry. | ||
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| When the IntegrationKit is created, it uses as a base image a JDK based container and add certain applications layers on top of it. However, instead of using always the same root base image, we check if an IntegrationKit with a subset of dependencies already exists, sparing quite some time on the generation of the new container image. |
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docs/modules/ROOT/pages/installation/advanced/build-config.adoc
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| = Build configuration | ||
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| The default installation provides some default configuration in order to perform a build and the publishing of the application in the container registry. In order to provide a more customized user experience, we provide two build configuration which you can use: **Build Strategy** and **Publish Strategy**. | ||
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| [[build-strategy]] | ||
| == Build strategy | ||
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| The build strategy is used to control the behavior of the application build from the Integration source. This is equivalent to the Maven process building a Java application. You can configure the operator to run this operation either as a routine (or thread) in the same operator application, or to spin off a Kubernetes Pod and execute the build in a new separate application. | ||
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| The `routine` strategy (default) is in general faster as it does not require Kubernetes to create any new resource, however it consumes a high amount of memory and may slow down any other process run in the same Camel K operator Pod. In general is a good strategy, but you need to consider the trade off if you have multiple concurrent builds at the same time. | ||
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| The `pod` strategy is **always** used when running a Quarkus native build (as it requires certain tools not available in the operator container). You can also use this strategy when you want to have a higher level of concurrency. Although a bit slower (it requires Kubernetes to spin off a new Pod), this strategy will guarantee the execution of each parallel build in a timely manner. | ||
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| NOTE: the `pod` strategy was also required when using the now deprecated Buildah or Kaniko publishing strategy. | ||
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| Beside the build strategy, there are other configuration you can fine tune for each single build (via builder trait) or in the `.spec.build.buildConfiguration` of the IntegrationPlatform if you want to apply such configuration to all your builds. See the Builder trait page for more information. | ||
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| The most relevant are the `resource` and `limit` parameters which can be used to control how much resources to give to builder Pods. Then you can configure the `orderStrategy`, setting a `sequential` (single build), `fifo` (parallel build started in FIFO order) or `dependencies` (parallel build holding those applications which may depends on other because of ** xref:architecture/incremental-image.adoc[incremental image]). Finally you can include any `mavenProfile` to the build in order to influence the behavior of the build (ie, adding any plugin or configuration you can use when xref:pipeline/pipeline.adoc[running a pipeline]). | ||
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| [[publish-strategy]] | ||
| == Publish strategy | ||
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| The publish strategy is used to control the behavior of the creation of the container after a build. Basically it create a container image from the application built in the previous step and store as a container in the xref:installation/registry/registry.adoc[registry] configured. | ||
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| The operator has 3 different strategy which you can adopt: Spectrum (default in plain Kubernetes profile), S2I (default in Openshift profile) and Jib. | ||
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| Each configuration provides a set of technologies which are supporting the creation of a container image and the storage into a container registry. https://github.com/container-tools/spectrum[Spectrum] is a lightweight technology based on https://github.com/google/go-containerregistry[go-containerregistry]. It creates a raw image on top of a base image and push very quickly to a registry. | ||
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| https://access.redhat.com/documentation/es-es/openshift_container_platform/4.2/html/builds/understanding-image-builds#build-strategy-s2i_understanding-image-builds[S2I] is an efficient technology integrated in Openshift, reason why it is enabled by default in such a profile. | ||
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| https://cloud.google.com/java/getting-started/jib[Jib] is a technology that transform a Java project into a container image and is configurable directly in Maven. | ||
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| NOTE: you may define your own publishing technology by using xref:pipeline/pipeline.adoc[pipelines]. |
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