Jenkins需要免密登录那必须是要ssh的方式了。那么先配置ssh如下

下面这是配置ssh免登陆的方式

两台电脑A和B。假如是A免密登录B这如下操作

A 电脑操作：
	1.ssh-keygen -t -rsa -b 4096
	2.会在路径/root/.ssh/目录下生产两个文件一个id_rsa私钥,另一个is_ras.pub公钥
	3.把公钥is_ras.pub拷贝到B电脑的/root/.ssh/authorized_keys下
	或者
	3.使用ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.100.10（B电脑）

B 电脑操作
	1.进入到cd /root/.ssh
	2.创建文件touch authorized_keys
	3.修改文件权限授予600权限（注意：此处权限必须是600）：
		chmod 600 /root/.ssh/authorized_keys
	4.在authorized_keys文件中追加A电脑生成的公钥

经过上面的操作可以直接在电脑A访问B了。

ssh root@106.52.xx.xx

配置好了电脑的ssh之后需要在Jenkins中进行授权的配置

点击添加凭证即可添加一个新的凭证

Jenkins远程配置免登陆流水线

经过上一步的操作，可以在Jenkins中我生成的一条测试流水线的Script如下：

node {
    sshagent (credentials: ['ssh_waiwangtest_key']) {
       sh 'ssh root@106.xx.xx.xx uname'
    }
}

但是很不幸的时候点击构建的 时候发生错误了。

错误代码如下

java.lang.NoSuchMethodError: No such DSL method 'sshagent' found among steps [acceptGitLabMR, addGitLabMRComment, archive, bat, build, catchError, checkout, deleteDir, dir, echo, emailext, emailextrecipients, envVarsForTool, error, fileExists, findBuildScans, getContext, git, gitlabBuilds, gitlabCommitStatus, input, isUnix, junit, library, libraryResource, load, lock, mail, milestone, node, parallel, powershell, properties, publishChecks, pwd, pwsh, readFile, readTrusted, resolveScm, retry, script, sh, sleep, stage, stash, step, svn, tapdTestReport, timeout, timestamps, tm, tool, unarchive, unstable, unstash, updateGitlabCommitStatus, validateDeclarativePipeline, waitForQualityGate, waitUntil, warnError, withChecks, withContext, withCredentials, withEnv, withGradle, wrap, writeFile, ws] or symbols [all, allBranchesSame, allOf, always, ant, antFromApache, antOutcome, antTarget, any, anyOf, apiToken, architecture, archiveArtifacts, artifactManager, authorizationMatrix, batchFile, booleanParam, branch, brokenBuildSuspects, brokenTestsSuspects, buildButton, buildDiscarder, buildDiscarders, buildRetention, buildUser, buildingTag, caseInsensitive, caseSensitive, certificate, changeRequest, changelog, changeset, checkoutToSubdirectory, choice, choiceParam, cleanWs, clock, command, credentials, cron, crumb, culprits, defaultFolderConfiguration, defaultView, demand, developers, disableConcurrentBuilds, disableResume, downstream, dumb, durabilityHint, email-ext, envVars, envVarsFilter, environment, equals, expression, extendedEmailPublisher, file, fileParam, filePath, fingerprint, fingerprints, frameOptions, freeStyle, freeStyleJob, fromScm, fromSource, git, gitBranchDiscovery, gitHubBranchDiscovery, gitHubBranchHeadAuthority, gitHubExcludeArchivedRepositories, gitHubExcludePublicRepositories, gitHubForkDiscovery, gitHubPullRequestDiscovery, gitHubSshCheckout, gitHubTagDiscovery, gitHubTopicsFilter, gitHubTrustContributors, gitHubTrustEveryone, gitHubTrustNobody, gitHubTrustPermissions, gitLabConnection, gitTagDiscovery, github, githubPush, gitlab, gradle, headRegexFilter, headWildcardFilter, hyperlink, hyperlinkToModels, inheriting, inheritingGlobal, installSource, isRestartedRun, javadoc, jdk, jdkInstaller, jgit, jgitapache, jnlp, jobBuildDiscarder, jobName, junitTestResultStorage, label, lastDuration, lastFailure, lastGrantedAuthorities, lastStable, lastSuccess, legacy, legacySCM, list, local, location, logRotator, loggedInUsersCanDoAnything, mailer, masterBuild, maven, maven3Mojos, mavenErrors, mavenMojos, mavenWarnings, modernSCM, myView, namedBranchesDifferent, node, nodeProperties, nonInheriting, none, not, overrideIndexTriggers, paneStatus, parallelsAlwaysFailFast, parameters, password, pattern, permanent, pipelineTriggers, plainText, plugin, pollSCM, preserveStashes, projectNamingStrategy, proxy, pruneTags, queueItemAuthenticator, quietPeriod, rateLimit, rateLimitBuilds, recipients, requestor, resourceRoot, retainOnlyVariables, run, runParam, sSHLauncher, schedule, scmRetryCount, scriptApproval, scriptApprovalLink, search, security, shell, simpleBuildDiscarder, skipDefaultCheckout, skipStagesAfterUnstable, slave, sourceRegexFilter, sourceWildcardFilter, ssh, sshPublicKey, sshUserPrivateKey, standard, status, string, stringParam, suppressAutomaticTriggering, swapSpace, tag, teamSlugFilter, text, textParam, timestamper, timestamperConfig, timezone, tmpSpace, toolLocation, triggeredBy, unsecured, untrusted, upstream, upstreamDevelopers, userSeed, usernameColonPassword, usernamePassword, viewsTabBar, weather, withAnt, withSonarQubeEnv, zfs, zip] or globals [currentBuild, env, params, pipeline, scm]
	at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:216)
	at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:122)
	at sun.reflect.GeneratedMethodAccessor1170.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1213)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022)
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:42)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
	at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:163)
	at org.kohsuke.groovy.sandbox.GroovyInterceptor.onMethodCall(GroovyInterceptor.java:23)
	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:157)
	at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:161)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:165)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:135)
	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)
	at WorkflowScript.run(WorkflowScript:2)
	at ___cps.transform___(Native Method)
	at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:86)
	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:113)
	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:83)
	at sun.reflect.GeneratedMethodAccessor270.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
	at com.cloudbees.groovy.cps.impl.ClosureBlock.eval(ClosureBlock.java:46)
	at com.cloudbees.groovy.cps.Next.step(Next.java:83)
	at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:174)
	at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:163)
	at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:129)
	at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:268)
	at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:163)
	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:51)
	at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:185)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:400)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$400(CpsThreadGroup.java:96)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:312)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:276)
	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:67)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:136)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Finished: FAILURE

上面这段内容大概的意思就是没有安装ssh-agen。

然后在如下界面去安装ssh-agen

如果没有安装的话这里是会显示出来，因为我是按照了所以这里并不显示出来。

按照好了之后就可以，点击构建的方式来进行ssh免登陆的方式来登录操作远程系统。