Jenkins中使用docker插件，java.lang.Nul

ERROR: Build step failed with exception
java.lang.NullPointerException: uri was not specified
 
at com.google.common.base.Preconditions.checkNotNull(Preconditions.
at com.github.docker
at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.createDockerClient(DockerBuilder.
at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(DockerBuilder.
at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder.perform(DockerBuilder.
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.
at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.build(MavenModuleSetBuild.
at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.
at hudson.model.Run.execute(Run.
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.
at hudson.model.ResourceController.execute(ResourceController.
at hudson.model.Executor.run(Executor

解决办法：

1、 修改/lib/systemd/system/docker.service文件，在option参数中添加

vim  /lib/systemd/system/docker.service

第13行

ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

修改为

ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375

2、在jenkins管理界面中。系统管理-系统设置-Docker Builder 中，Docker URL 文本框中添加

image.png image.png

tcp://127.0.0.1:2375 （127.0.0.1 是你的ip）