use jenkins script to create ssh slaves from json string

jenkins_script_create_ssh_slaves.groovy

import hudson.model.*
import jenkins.model.*
import hudson.slaves.*
import hudson.slaves.EnvironmentVariablesNodeProperty.Entry
import hudson.plugins.sshslaves.verifiers.*
import groovy.json.JsonSlurper

// https://docs.cloudbees.com/docs/cloudbees-ci-kb/latest/client-and-managed-masters/create-agent-node-from-groovy
def createSlave(name, homeDir, host, port, credential, nodeDescription, numExecutors, labelString, mode, retentionStrategy) {
    // Pick one of the strategies from the comments below this line
    SshHostKeyVerificationStrategy hostKeyVerificationStrategy = new NonVerifyingKeyVerificationStrategy()
        //= new KnownHostsFileKeyVerificationStrategy() // Known hosts file Verification Strategy
        //= new ManuallyProvidedKeyVerificationStrategy("<your-key-here>") // Manually provided key Verification Strategy
        //= new ManuallyTrustedKeyVerificationStrategy(false /*requires initial manual trust*/) // Manually trusted key Verification Strategy
        //= new NonVerifyingKeyVerificationStrategy() // Non verifying Verification Strategy

    // Define a "Launch method": "Launch agents via SSH"
    ComputerLauncher launcher = new hudson.plugins.sshslaves.SSHLauncher(
        host, // Host
        port, // Port
        credential, // Credentials
        (String)null, // JVM Options
        (String)null, // JavaPath
        (String)null, // Prefix Start Agent Command
        (String)null, // Suffix Start Agent Command
        (Integer)null, // Connection Timeout in Seconds
        (Integer)null, // Maximum Number of Retries
        (Integer)null, // The number of seconds to wait between retries
        hostKeyVerificationStrategy // Host Key Verification Strategy
    )

    Slave agent = new DumbSlave(
        name,
        homeDir,
        launcher)
    agent.nodeDescription = nodeDescription
    agent.numExecutors = numExecutors
    agent.mode = mode
    agent.retentionStrategy = retentionStrategy
    agent.setLabelString(labelString)

    Jenkins.instance.addNode(agent)
}
def createSlavesByJsonString(jsonStr) {
    jsonSlurper = new JsonSlurper()
    slaves = jsonSlurper.parseText(jsonStr)
    slaves.each{slave->

        createSlave(slave['name'], '/root/jenkins_test', slave['host'], 22, slave['credential'], slave['nodeDescription'], slave['numExecutors'], slave['labelString'], Node.Mode.NORMAL, new RetentionStrategy.Always())
    }
}

// example
createSlavesByJsonString('[{"name":"build-node-01","home_dir":"/root/","host":"10.10.1.1","credential":"linux-root","port":22,"nodeDescription":"","numExecutors":1,"labelString":"linux build","mode":"NORMAL"},