本文主要向大家介绍了Linux运维知识之Jenkins pipeline 并行执行任务流，通过具体的内容向大家展现，希望对大家学习Linux运维知识有所帮助。

之前的任务并行方式

我们在一个 stage 中设置多个子 stage 并行执行：

stages {
    stage('Stage1') {
        ...
    }
    stage('并行执行的 Stage') {
        parallel {
            stage('Stage2.1') {
                agent { label "test1" }
                steps {
                    echo "在 agent test1 上执行的并行任务 1."
                }
            }
            stage('Stage2.2') {
                agent { label "test2" }
                steps {
                    echo "在 agent test2 上执行的并行任务 2."
                }
            }
        }
    }
    stage('Stage3') {
        ...
    }
}

上面代码中任务的执行过程如下图所示：

任务 2.1 和任务 2.2 并行执行。

并行执行任务流

过去并行执行的任务都是单个的，但实际情况中我们还需要任务流级别的并行能力，如下图所示：

上图中显示有两条任务流在并行的执行，我们可以通过下面的代码来实现：

pipeline {
    agent none

    stages {
        stage('Stage1') {
            agent { label "master" }
            steps {
                timestamps {
                    echo '这是第一个被执行的 stage.'
                    sleep 5
                }
            }
        }
        stage("build, deploy and test on Windows and Linux") {
            parallel {
                stage("windows") {
                    agent {
                        label "master"
                    }
                    stages {
                        stage("build") {
                            steps {
                                timestamps {
                                    echo "build on windows."
                                }
                            }
                        }
                        stage("deploy") {
                            steps {
                                timestamps {
                                    echo "deploy on windows."
                                }
                            }
                        }
                        stage("test") {
                            steps {
                                timestamps {
                                    echo "test on windows."
                                    sleep 5
                                }
                            }
                        }
                    }
                }

                stage("linux") {
                    agent {
                        label "worker1"
                    }
                    stages {
                        stage("build") {
                            steps {
                                timestamps {
                                    echo "build on linux."
                                }
                            }
                        }
                        stage("deploy") {
                             steps {
                                 timestamps {
                                     echo "deploy on linux."
                                 }
                            }
                        }
                        stage("test") {
                            steps {
                                timestamps {
                                    echo "test on linux."
                                    sleep 5
                                }
                            }
                        }
                    }
                }
            }
        }
        stage('Stage3') {
            agent { label "worker1" }
            steps {
                timestamps {
                    echo '这是最后一个被执行的 stage.'
                }
            }
        }
    }
}

为了显示任务的执行时间，笔者使用了 timestamper 插件。下图显示了笔者精简后的运行日志：

红框中的内容说明我们的两个任务流是完全并行执行的。这就是 1.3 版的声明式 pipeline 中增加的 “sequential stages” 功能。

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