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使用yum install jenkins方式安装jenkins。
俺的jenkins只部署了一台机器。
使用git branch: "$brans", credentialsid: 'platform-jenkins', url: "$git_url/${app_name}.git"下载代码时提示以下异常，但是在服务器上执行git clone命令却能正常执行。
error: error cloning remote repo 'origin' hudson.plugins.git.gitexception: command "git fetch --tags --progress git@git/kd-gateway.git +refs/heads/*:refs/remotes/origin/*" returned status code 128: stdout: stderr: permission denied (publickey). fatal: could not read from remote repository. please make sure you have the correct access rights and the repository exists.
因为使用的是yum方式安装的jenkins，所以jenkins启动的时候启动用户是jenkins（可以通过ps -ef|grep jenkins来查看启动用户），而jenkins服务器上ssh的相关配置和用户却是root，所以就导致没有权限去执行git命令。
配置git账号的ssh免密登录，具体怎么配置可以自行百度，这里说下配置的时候需要注意的点：
我要评论/var/lib/jenkins/.ssh目录下id_rsa、id_rsa.pub这两个文件的所属用户、用户组都是jenkins[root@infra2-test-k8s .ssh]# ls -l total 12 -rw-------. 1 jenkins jenkins 1679 apr 7 20:50 id_rsa -rw-r--r--. 1 jenkins jenkins 393 apr 7 20:50 id_rsa.pub -rw-r--r--. 1 jenkins jenkins 197 apr 7 19:19 known_hosts
修改文件所属用户、用户组命令：chown -r jenkins:jenkins id_rsa。
然后去掉拉取git代码的命令行中的credentialsid：git branch: "$brans", url: "$git_url/${app_name}.git
还有另外一种就是修改jenkins用户的用户组，将其放入root用户组中，命令如下：
# 添加 gpasswd -a root jenkins # 移除 gpasswd -d root jenkins
jenkins启动用户是放在
/etc/sysconfig/jenkins文件中的jenkins_user参数下，对应的用户组参数：jenkins_group
这个办法理论上是可以的，不过我没试，这里仅供参考。
error: error fetching remote repo 'origin' hudson.plugins.git.gitexception: failed to fetch from git@git/kd-gateway.git at hudson.plugins.git.gitscm.fetchfrom(gitscm.java:909) at hudson.plugins.git.gitscm.retrievechanges(gitscm.java:1131) at hudson.plugins.git.gitscm.checkout(gitscm.java:1167) at org.jenkinsci.plugins.workflow.steps.scm.scmstep.checkout(scmstep.java:124) at org.jenkinsci.plugins.workflow.steps.scm.scmstep$stepexecutionimpl.run(scmstep.java:93) at org.jenkinsci.plugins.workflow.steps.scm.scmstep$stepexecutionimpl.run(scmstep.java:80) at org.jenkinsci.plugins.workflow.steps.synchronousnonblockingstepexecution.lambda$start$0(synchronousnonblockingstepexecution.java:47) at java.util.concurrent.executors$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) caused by: hudson.plugins.git.gitexception: command "git config remote.origin.url git@git/kd-gateway.git" returned status code 255: stdout: stderr: error: could not lock config file .git/config: permission denied at org.jenkinsci.plugins.gitclient.cligitapiimpl.launchcommandin(cligitapiimpl.java:2430) at org.jenkinsci.plugins.gitclient.cligitapiimpl.launchcommandin(cligitapiimpl.java:2360) at org.jenkinsci.plugins.gitclient.cligitapiimpl.launchcommandin(cligitapiimpl.java:2356) at org.jenkinsci.plugins.gitclient.cligitapiimpl.launchcommand(cligitapiimpl.java:1916) at org.jenkinsci.plugins.gitclient.cligitapiimpl.launchcommand(cligitapiimpl.java:1928) at org.jenkinsci.plugins.gitclient.cligitapiimpl.setremoteurl(cligitapiimpl.java:1542) at hudson.plugins.git.gitapi.setremoteurl(gitapi.java:160) at hudson.plugins.git.gitscm.fetchfrom(gitscm.java:897) ... 11 more
错误原因就是没有配置git的ssh免密登录权限，在服务器上配置下即可。
使用maven命令打包时提示：
+ mvn -dmaven.test.failure.ignore clean package -p test which: no java in (/sbin:/usr/sbin:/bin:/usr/bin) the java_home environment variable is not defined correctly this environment variable is needed to run this program nb: java_home should point to a jdk not a jre
但是去服务器上看了下java的配置没问题，maven的配置也没问题，path也没问题。
maven是从/sbin:/usr/sbin:/bin:/usr/bin这几个目录下找java的，去服务器上的这几个目录下看了，确实没有java，那么原因应该就是这个了。
做个java的软连接即可。
命令：
ln -s java_home/bin/java /usr/bin/java
+ mvn -dmaven.test.failure.ignore clean package -p test [info] scanning for projects... downloading from nexus: http://39.96.216.150:8081/repository/maven-public/org/springframework/boot/spring-boot-starter-parent/2.2.5.release/spring-boot-starter-parent-2.2.5.release.pom [warning] failed to create parent directories for tracking file /opt/apache-maven-3.6.3/localrepo/org/springframework/boot/spring-boot-starter-parent/2.2.5.release/spring-boot-starter-parent-2.2.5.release.pom.lastupdated [error] [error] some problems were encountered while processing the poms: [fatal] non-resolvable parent pom for cn.kuaidao:gateway:0.0.1-snapshot: could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.2.5.release from/to nexus (http://39.96.216.150:8081/repository/maven-public/): /opt/apache-maven-3.6.3/localrepo/org/springframework/boot/spring-boot-starter-parent/2.2.5.release/spring-boot-starter-parent-2.2.5.release.pom.part.lock (no such file or directory) and 'parent.relativepath' points at no local pom @ line 5, column 13 @ [error] the build could not read 1 project -> [help 1] [error] [error] the project cn.kuaidao:gateway:0.0.1-snapshot (/var/lib/jenkins/workspace/test-kd-gateway/pom.xml) has 1 error [error] non-resolvable parent pom for cn.kuaidao:gateway:0.0.1-snapshot: could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.2.5.release from/to nexus (http://39.96.216.150:8081/repository/maven-public/): /opt/apache-maven-3.6.3/localrepo/org/springframework/boot/spring-boot-starter-parent/2.2.5.release/spring-boot-starter-parent-2.2.5.release.pom.part.lock (no such file or directory) and 'parent.relativepath' points at no local pom @ line 5, column 13 -> [help 2] [error] [error] to see the full stack trace of the errors, re-run maven with the -e switch. [error] re-run maven using the -x switch to enable full debug logging. [error] [error] for more information about the errors and possible solutions, please read the following articles: [error] [help 1] http://cwiki.apache.org/confluence/display/maven/projectbuildingexception [error] [help 2] http://cwiki.apache.org/confluence/display/maven/unresolvablemodelexception
原因和错误1一样，都是用户权限的问题，jenkins用户没有权限去localrepo这个目录下创建文件、文件夹，所以就导致找不到文件。ls -l命令查看/opt/apache-maven-3.6.3/localrepo这个文件夹所属用户和用户组都是root，修改为jenkins即可。
修改文件夹所属用户、用户组。
命令：chown -r jenkins:jenkins localrepo。
使用docker构建应用提示以下错误：
+ docker build -t 192.168.30.176:5000/kd-gateway:1.0.29-test -f docker/dockerfile . got permission denied while trying to connect to the docker daemon socket at unix:///var/run/docker.sock: post http://%2fvar%2frun%2fdocker.sock/v1.26/build?buildargs=%7b%7d&buildbinds=null&cachefrom=%5b%5d&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=docker%2fdockerfile&labels=%7b%7d&memory=0&memswap=0&networkmode=default&rm=1&shmsize=0&t=192.168.30.176%3a5000%2fkd-gateway%3a1.0.29-test&ulimits=null: dial unix /var/run/docker.sock: connect: permission denied
/var/run/docker.sock权限问题，这个文件的所属用户、用户组都是root，需要将其修改为jenkins用户。
修改文件所属用户、用户组。
命令：chown -r jenkins:jenkins docker.sock。
大部分都是权限问题，但是不知道什么原因，我的root用户切换不了jenkins用户，导致排查问题只能靠我机智的大脑去猜，这个就很坑。
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