docker.withServer('tcp://example.com:2376', 'example.com-docker-tls') { 
 def newApp = docker.build "example/example:${env.BUILD_TAG}" 
}

+ docker build -t example/example:jenkins-example-master-12 . 
time="2019-10-26T10:13:52Z" level=error msg="Can't add file /var/jenkins_home/workspace/example_master/.git/objects/40/0f84be9fb843c2fe24ae52c6f7125302d1cd26 to tar: io: read/write on closed pipe" 
time="2019-10-26T10:13:52Z" level=error msg="Can't close tar writer: io: read/write on closed pipe"
error during connect: Post http://example.com:2376/v1.39/build?buildargs=%7B%7D&cachefrom=%5B%5D&cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile&labels=%7B%7D&memory=0&memswap=0&networkmode=default&rm=1&session=puyypvvvedonr4ky04k16b85n&shmsize=0&t=example%2Fexample%3Ajenkins-example-master-12&target=&ulimits=null&version=1: net/http: HTTP/1.x transport connection broken: write tcp 172.17.0.4:33106->127.0.0.1:2376: write: broken pipe 
10:13:52.096362 durable_task_monitor.go:63: exit status 1

+ env
JENKINS_HOME=/var/jenkins_home
JENKINS_UC_EXPERIMENTAL=https://updates.jenkins.io/experimental
JAVA_ALPINE_VERSION=8.212.04-r0
RUN_CHANGES_DISPLAY_URL=https://jenkins.example.com/job/example/job/master/10/display/redirect?page=changes 
HOSTNAME=579ca0beebd8
LD_LIBRARY_PATH=/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64:/usr/lib/jvm/java-1.8-openjdk/jre/../lib/amd64
NODE_LABELS=master
HUDSON_URL=https://jenkins.example.com/ 
SHLVL=1
HOME=/var/jenkins_home
BUILD_URL=https://jenkins.example.com/job/example/job/master/10/ 
HUDSON_COOKIE=28bef3bc-3f23-4d1b-9504-2cfe0d7c7b43
JENKINS_SERVER_COOKIE=durable-9f034a1532fee0cf7d249a18086844f8
JENKINS_UC=https://updates.jenkins.io
WORKSPACE=/var/jenkins_home/workspace/example_master 
REF=/usr/share/jenkins/ref
JAVA_VERSION=8u212
NODE_NAME=master
EXECUTOR_NUMBER=1
JENKINS_VERSION=2.190.1
JENKINS_INCREMENTALS_REPO_MIRROR=https://repo.jenkins-ci.org/incrementals
BUILD_DISPLAY_NAME=#10
HUDSON_HOME=/var/jenkins_home
JOB_BASE_NAME=master
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin
BUILD_ID=10
BUILD_TAG=jenkins-example-master-10 
LANG=C.UTF-8
JENKINS_URL=https://jenkins.example.com/ 
JOB_URL=https://jenkins.example.com/job/example/job/master/ 
BUILD_NUMBER=10
JENKINS_NODE_COOKIE=b30c0594-9acb-4370-9ed9-1355d12e90e6
RUN_DISPLAY_URL=https://jenkins.example.com/job/example/job/master/10/display/redirect 
JENKINS_SLAVE_AGENT_PORT=50000
HUDSON_SERVER_COOKIE=47430c4ce0b36e37
DOCKER_HOST=tcp://example.com:2376 
JOB_DISPLAY_URL=https://jenkins.example.com/job/example/job/master/display/redirect 
JOB_NAME=example/master 
COPY_REFERENCE_FILE_LOG=/var/jenkins_home/copy_reference_file.log
JAVA_HOME=/usr/lib/jvm/java-1.8-openjdk
PWD=/var/jenkins_home/workspace/example_master 
BRANCH_NAME=master
[Pipeline] sh
+ docker info
Error response from daemon: Client sent an HTTP request to an HTTPS server.
09:30:18.148356 durable_task_monitor.go:63: exit status 1