一.Jenkins不能下载插件 报错sun.security.provider.certpath.SunCertPathBuilderException

sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:145)
	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:131)
	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
Caused: sun.security.validator.ValidatorException: PKIX path building failed
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
	at sun.security.validator.Validator.validate(Validator.java:260)
	at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1351)
Caused: javax.net.ssl.SSLHandshakeException
	at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
	at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1917)
	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:301)
	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:295)
	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1369)
	at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:156)
	at sun.security.ssl.Handshaker.processLoop(Handshaker.java:925)
	at sun.security.ssl.Handshaker.process_record(Handshaker.java:860)
	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1043)
	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1343)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355)
	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:563)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1511)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.testConnection(UpdateCenter.java:1406)
Caused: java.io.IOException: Failed to validate the SSL certificate of https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json?uctest
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.testConnection(UpdateCenter.java:1418)
	at hudson.model.UpdateCenter$UpdateCenterConfiguration.checkUpdateCenter(UpdateCenter.java:1189)
	at hudson.model.UpdateCenter$ConnectionCheckJob.run(UpdateCenter.java:1638)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:118)
	at java.lang.Thread.run(Thread.java:745)

解决方法:

1.更新站点

https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json

2.下载插件Skip Certificate Check的安装文件

https://plugins.jenkins.io/skip-certificate-check/

3.在Jenkins离线安装插件

还是刚刚更换站点的那个页面,把刚刚下载下来的文件上传然后点击deploy即可

安装完成后重启Jenkins即可解决

二.jenkins启动失败: jenkins: failed to find a valid Java installation

解决办法

首先要确保java环境变量可以用

1.查看java环境变量的命令

which java

2.检查配置文件

vim /etc/init.d/jenkins 

vim /etc/sysconfig/jenkins

检查配置文件中的JAVA环境变量是否都配置正确, 如果有问题就更改为正确的 , 然后执行如下命令使配置重新生效

systemctl daemon-reload

如果配置正确 , 也可以执行上面的命令 , 然后重启 , 如果还是启动失败 , 并且通过

journalctl -xe

命令看到报错

那么可以使用ln -s的方式建立软连接

3.建立软连接

ln -s /usr/local/jdk/jdk1.8/bin/java /usr/bin/java

4.重新载入配置

systemctl daemon-reload

5.重启Jenkins

systemctl start jenkins

其他更多的Jenkins操作可以看我的其他博客 :

服务搭建篇(九) 使用GitLab+Jenkins搭建CI\CD执行环境 (上) 基础环境搭建
服务搭建篇(十) 使用GitLab+Jenkins搭建CI\CD执行环境 (下) 配置整合