Pipeline Syntax. Differences when considering top and phase level Agents

This area develops regarding the information introduced in Getting started with Pipeline and really should be addressed entirely as being a guide. To learn more about how exactly to make use of Pipeline syntax in practical examples, relate to the Using a Jenkinsfile portion of this chapter. At the time of variation 2.5 for the Pipeline plugin, Pipeline supports two discrete syntaxes that are detailed below. When it comes to advantages and disadvantages of each, understand Syntax Comparison.

As talked about in the beginning of this chapter, the essential fundamental part of a Pipeline could be the “step”. Essentially, actions tell Jenkins how to handle it and act as the building that is basic both for Declarative and Scripted Pipeline syntax.

For a summary of available actions, please relate to the Pipeline procedures guide containing a comprehensive variety of actions included in Pipeline along with actions given by plugins.

Declarative Pipeline

Declarative Pipeline is really a reasonably new addition to Jenkins Pipeline [1] which presents an even more simplified and opinionated syntax along with the Pipeline sub-systems.

All valid pipelines that are declarative be enclosed within a pipeline block, as an example:

The fundamental statements and expressions that are legitimate in Declarative Pipeline proceed with the exact exact exact same guidelines as Groovy’s syntax with all the exceptions that are following

The top-level for the Pipeline should be a block, particularly: pipeline < >.

No semicolons as statement separators. Each declaration needs to be alone line.

Blocks must just include parts, Directives, procedures, or project statements.

Home guide declaration is addressed as a no-argument technique invocation. Therefore, as an example, input is addressed as input() .

You need to use the Declarative Directive Generator to acquire started with configuring the directives and parts in your Declarative Pipeline.


Parts in Declarative Pipeline typically contain more than one Directives or procedures.


The representative part specifies where in fact the whole Pipeline, or a particular phase, will perform within the Jenkins environment dependent on in which the representative part is positioned. The part must certanly online installment loans Wisconsin be defined in the top-level in the pipeline block, but usage that is stage-level optional.

Within the pipeline that is top-level and every phase block.

There are many nuances whenever including a representative to your top degree or a phase degree, and also this if the choices directive is used.

Top Level Agents

In agents declared at the outermost standard of the Pipeline, the choices are invoked after going into the agent. For example, whenever timeout that is using will soon be just put on the execution inside the representative.

Phase Agents

In agents declared within a phase, the choices are invoked before going into the representative and before checking any when conditions. In cases like this, when timeout that is using its applied ahead of the representative is allocated. The timeout includes the agent provisioning time. Since the timeout includes the agent provisioning time, the Pipeline may fail where representative allocation is delayed. Whenever using timeout , it’s going to applied prior to the representative which means timeout will take into account the provisioning time. This might result in the pipeline to timeout if it can take a long time to allocate a representative.


To be able to support the wide array of use-cases Pipeline authors could have, the representative part supports a couple of various kinds of parameters. These parameters are used during the top-level of this pipeline block, or within each stage directive.

Execute the Pipeline, or phase, on any available agent. As an example: agent any

When used during the top-level associated with pipeline block no worldwide representative will be allocated for your Pipeline run and every phase area will have to include its very own representative part. For instance: representative none

Execute the Pipeline, or phase, on a representative for sale in the Jenkins environment using the provided label. As an example: representative

Label conditions can additionally be utilized. As an example: representative or representative

representative behaves exactly like representative, but node enables for extra choices (such as for instance customWorkspace ).

Execute the Pipeline, or stage, aided by the provided container that will be dynamically provisioned on a node pre-configured to simply accept pipelines that are docker-based or for a node matching the optionally defined label parameter. docker additionally optionally takes an args parameter which could include arguments to pass straight to a docker run invocation, plus an alwaysPull option, that will force a docker pull no matter if the image title has already been current. As an example: representative or

docker also optionally accepts a registryCredentialsId and registryUrl parameters which can only help to specify the Docker Registry to utilize and its particular qualifications. The parameter registryCredentialsId could be properly used alone for personal repositories inside the docker hub. As an example:

Execute the Pipeline, or phase, having a container built from a Dockerfile included in the supply repository. To be able to utilize this choice, the Jenkinsfile needs to be packed from either a Multibranch Pipeline or perhaps a Pipeline from SCM. Conventionally this is actually the Dockerfile when you look at the base of the supply repository: representative. If creating a Dockerfile an additional directory, make use of the dir choice: representative. If for example the Dockerfile has another title, you are able to specify the file name because of the filename choice. It is possible to pass extra arguments into the docker build …​ demand aided by the additionalBuildArgs choice, like agent. As an example, a repository aided by the file build/Dockerfile.build , anticipating a create argument version :

dockerfile also optionally accepts a registryCredentialsId and registryUrl parameters which will surely help to specify the Docker Registry to make use of and its own qualifications. As an example:

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