在使用Jenkins构建拉取Gitlab上的仓库时总是出现权限失败，无法访问的情况，如打印以下信息：

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Started by user lhy
Building in workspace /usr/share/tomcat8/.jenkins/workspace/zxpm
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url git@192.168.1.2:web/zxpm.git # timeout=10
Fetching upstream changes from git@192.168.1.2:web/zxpm.git
 > git --version # timeout=10
using GIT_SSH to set credentials 
 > git -c core.askpass=true fetch --tags --progress git@192.168.1.2:web/zxpm.git +refs/heads/*:refs/remotes/origin/*
ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from git@192.168.1.2:web/zxpm.git
	at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:799)
	at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1055)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1086)
	at hudson.scm.SCM.checkout(SCM.java:485)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1269)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:604)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529)
	at hudson.model.Run.execute(Run.java:1741)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:531)
	at hudson.model.ResourceController.execute(ResourceController.java:98)
	at hudson.model.Executor.run(Executor.java:410)
Caused by: hudson.plugins.git.GitException: Command "git -c core.askpass=true fetch --tags --progress git@192.168.1.2:web/zxpm.git +refs/heads/*:refs/remotes/origin/*" returned status code 128:
stdout: 
stderr: Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,password).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1740)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1476)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:63)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:314)
	at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:797)
	... 11 more
ERROR: null
Finished: FAILURE

这个问题只需要细心点就可以了。配置Jenkins项目时，在源码管理中选择Git(前提是已安装好Git插件)，填好仓库地址，认证点击Add，如图

jenkins git
jenkins git

private key
private key

在Kind中选择SSH Username with private key，下面的Private Key选择Enter directly直接输入在Gitlab部署了public key对应的private key即可。一般public key是在~/.ssh/id_rsa.pub,而private key是~/.ssh/id_rsa。
点击OK，保存项目再次构建就好了。