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Rem cx-server references from infrastructure documentation (SAP#4886)
* Rem cx-server references from infrastructure documentation * Rem reference to cx server in plugin doc * Rem cx-server reference from abap doc * Rem cx-server reference from gcts cod * Rem cx-server ref from guided tour * Rem unused links * Rem unused refs * remove cx-server from development.md --------- Co-authored-by: Oliver Feldmann <[email protected]> Co-authored-by: tiloKo <[email protected]>
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| # Infrastructure | ||
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| Besides SAP specific Jenkins library steps and out-of-the-box pipelines, project "Piper" offers also documentation and tooling to start the corresponding Jenkins server with all the configuration required to run project "Piper" pipelines. | ||
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| The core of the Jenkins infrastructure tooling is a set of [Docker images][docker-images]. | ||
| There is a main Docker image containing a preconfigured Jenkins and several tooling images used in the specific project "Piper" steps. | ||
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| !!! info "Docker Hub rate limiting" | ||
| Please be aware that Docker Hub as rate limiting active which might cause project "Piper" pipelines to fail. | ||
| Refer to the [page dedicated to docker rate limiting for details and solutions][resources-docker-rate-limit]. | ||
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| The document and the linked resources explain the various ways of starting such a Jenkins server based on these Docker images. | ||
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| ## Cx Server (Recommended) | ||
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| Cx Server is a life-cycle management tool to bootstrap a pre-configured Jenkins instance within minutes on your own (virtual) server. | ||
| It uses the Docker images mentioned above. | ||
| As it would be cumbersome to start the Docker image manually with all required parameters and sidecar images, this command line tool automates the bootstraping. | ||
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| ### Setting up a Jenkins master | ||
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| For the following steps you will need a server or another machine which has Docker installed and configured. | ||
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| To get started, initialize the Cx Server by using this `docker run` command: | ||
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| ```sh | ||
| docker run -it --rm -u $(id -u):$(id -g) -v "${PWD}":/cx-server/mount/ ppiper/cx-server-companion:latest init-cx-server | ||
| ``` | ||
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| This creates a few files in your current working directory. | ||
| The shell script `cx-server` and the configuration file `server.cfg` are of special interest. | ||
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| Now, you can start the Jenkins server by using the following command: | ||
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| ```sh | ||
| chmod +x ./cx-server | ||
| ./cx-server start | ||
| ``` | ||
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| For more information on the Cx Server and how to customize your Jenkins, have a look at the [Operations Guide for Cx Server][devops-docker-images-cxs-guide]. | ||
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| ### Setting up Jenkins agents | ||
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| With more and more qualities checked automatically in the pipeline, more and more resources are required to handle the workload. | ||
| This section shows how to scale the pipeline by adding [Jenkins build agents][build-agents]. | ||
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| However, before setting up agents please consider also other ways to scale the build infrastructure. | ||
| It might be an option to have only one Jenkins master with lots of resources (cpu cores, memory) per project or team. | ||
| This has the advantage of bringing more configuration flexibility and isolation for the individual teams but has the disadvantage that parts of the configuration have to be maintained twice. | ||
| Furthermore, having agents and thus network communication between the build servers increases the risk of failures. | ||
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| To add an agent to the Jenkins master, please make sure to fulfil the following requirements similar to the ones for the Jenkins master: | ||
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| - Access to a new server which runs on Linux | ||
| - Docker installed on this server | ||
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| The connection between the master and the agents will be established via ssh. | ||
| As the Jenkins master runs in a Docker container, the ssh setup steps, such as creating and storing a private/public key pair or maintaining the konwn hosts file has to be done inside this container. | ||
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| To execute these steps inside the container, execute the following command on the server where the Jenkins master is running: | ||
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| ```bash | ||
| docker exec -it cx-jenkins-master bash | ||
| ``` | ||
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| Inside the container make sure to be able to access the server where the Jenkins agent should be started by running the following command. As user you should use a user which is able to execute `docker` commands, i.e. starting a docker container. | ||
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| ```bash | ||
| ssh <docker-user>@<host/ip> | ||
| ``` | ||
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| To be able to access the agent via ssh with the command above you might need to generate a new ssh key with `ssh-keygen`, store it in the `.ssh` folder and register the public key on the agent server. | ||
| You might also need to add server’s fingerprint to the list of known hosts. | ||
| For more information around establishing a ssh connection please consult the [ssh documentation][ssh-documentation]. | ||
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| To setup a new Jenkins agent, open "Manage Jenkins" > "Manage Nodes" > "New Nodes" and create a new "Permanent Agent" | ||
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| Please define `/var/jenkins_home` as "Remote root directory". | ||
| The launch method has to be "Launch agent via execution of command on the master" and the command should be: | ||
| `./var/jenkins_home/launch-jenkins-agent.sh <user> <host> [image]`. | ||
| User and host should equal the values you used above to test the ssh connection. | ||
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| The following picture shows an example configuration. | ||
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|  | ||
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| ## Kubernetes (Experimental) | ||
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| Hosting Jenkins master and agents means that we bind the required resources to the purpose of executing builds. | ||
| There are good chances that, these resources stay idle for the most part of the day, i.e. if you have high peak loads. | ||
| Autoscaling of the infrastructure solves such a problem. | ||
| Instead of reserving the resources proactively, the pipeline creates the Jenkins agents dynamically on a Kubernetes cluster during the execution. | ||
| Once the agent completes the dedicated task, it is deleted and the resources are freed. | ||
| Project "Piper" supports running the pipeline as well as individual steps in a Kubernetes Cluster. | ||
| Please note that this feature is currently only experimental. | ||
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| To setup the Jenkins master in Kubernetes you can use helm. | ||
| The documentation to install Jenkins using helm can be found [here][jenkins-helm]. | ||
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| To use the Jenkins image provided by project Piper, pass `ppiper/jenkins-master` as a value for the `Master.Image` command line argument while deploying Jenkins to Kubernetes. | ||
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| The successfully completed deployment consists of a Jenkins pod with port 80 and 50000 exposed for HTTP and internal JNLP traffic respectively. | ||
| The deployment also creates two services each to listen to incoming HTTP traffic on port 80 and the internal JNLP traffic on port 50000. | ||
| Please note that in this example setup, the SSL/TLS termination happens at the load balancer, hence all the traffic between a load balancer and the Jenkins pod is unencrypted. | ||
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| Project "Piper" needs an environment variable set in the Jenkins to run the workload in Kubernetes. | ||
| In order to set the environment variable, navigate to "Manage Jenkins" > "Configure System" > "Global Properties". | ||
| Add an environment variable ON_K8S and set the value to true: | ||
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|  | ||
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| Afterwards, you should be able to run project "Piper" pipelines in Kubernetes. | ||
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| ## Custom Jenkins | ||
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| ### On your own: Custom Jenkins Setup | ||
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| If you use your own Jenkins installation, you need to care for the configuration that is specific to project "Piper". | ||
| This option should only be considered if you know why you need it, otherwise using the Cx Server life-cycle management makes your life much easier. | ||
| If you choose to go this path, follow the [Custom Jenkins Setup guide][resources-custom-jenkins]. | ||
| To run project "Piper", you will need your own Jenkins installation, and you need to care for the configuration that is specific to project "Piper". Please follow the [Custom Jenkins Setup guide][resources-custom-jenkins]. | ||
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| [devops-docker-images-cxs-guide]: https://github.com/SAP/devops-docker-cx-server/blob/master/docs/operations/cx-server-operations-guide.md | ||
| [docker-images]: https://hub.docker.com/u/ppiper | ||
| [resources-docker-rate-limit]: docker-rate-limit.md | ||
| [resources-custom-jenkins]: customjenkins.md | ||
| [build-agents]: https://wiki.jenkins.io/display/jenkins/distributed+builds | ||
| [ssh-documentation]: https://www.openssh.com/manual.html | ||
| [jenkins-helm]: https://github.com/helm/charts/tree/master/stable/jenkins |
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