以下是影像的 Dockerfile，
FROM jenkins/jenkins:lts-jdk11
USER jenkins
RUN jenkins-plugin-cli --plugins "blueocean:1.25.2 http_request" && ls -la /var/jenkins_home
當它使用 構建時docker build -t ireshmm/jenkins:lts-jdk11 .，以下是輸出，
Sending build context to Docker daemon 3.072kB
Step 1/3 : FROM jenkins/jenkins:lts-jdk11
---> 9aee0d53624f
Step 2/3 : USER jenkins
---> Using cache
---> 49d657d24299
Step 3/3 : RUN jenkins-plugin-cli --plugins "blueocean:1.25.2 http_request" && ls -la /var/jenkins_home
---> Running in b459c4c48e3e
Done
total 20
drwxr-xr-x 3 jenkins jenkins 4096 Jan 22 16:49 .
drwxr-xr-x 1 root root 4096 Jan 12 15:46 ..
drwxr-xr-x 3 jenkins jenkins 4096 Jan 22 16:49 .cache
-rw-rw-r-- 1 jenkins root 7152 Jan 12 15:42 tini_pub.gpg
Removing intermediate container b459c4c48e3e
---> 5fd5ba428f1a
Successfully built 5fd5ba428f1a
Successfully tagged ireshmm/jenkins:lts-jdk11
創建容器并列出檔案時docker run -it --rm ireshmm/jenkins:lts-jdk11 ls -la /var/jenkins_home，輸出如下：
total 40
drwxr-xr-x 3 jenkins jenkins 4096 Jan 22 16:51 .
drwxr-xr-x 1 root root 4096 Jan 12 15:46 ..
-rw-r--r-- 1 jenkins jenkins 4683 Jan 22 16:51 copy_reference_file.log
drwxr-xr-x 2 jenkins jenkins 16384 Jan 22 16:51 plugins
-rw-rw-r-- 1 jenkins root 7152 Jan 12 15:42 tini_pub.gpg
問題：為什么/var/jenkins_home在構建鏡像和從它創建的容器內部時內容不同，因為在構建鏡像時列出檔案后沒有運行命令？怎么會這樣？
uj5u.com熱心網友回復：
有jenkins/jenkins:lts-jdk11一個ENTRYPOINTthat runs /usr/local/bin/jenkins.sh，其中包括創建copy_reference_file.log檔案：
$ grep -i copy_reference /usr/local/bin/jenkins.sh
: "${COPY_REFERENCE_FILE_LOG:="${JENKINS_HOME}/copy_reference_file.log"}"
touch "${COPY_REFERENCE_FILE_LOG}" || { echo "Can not write to ${COPY_REFERENCE_FILE_LOG}. Wrong volume permissions?"; exit 1; }
echo "--- Copying files at $(date)" >> "$COPY_REFERENCE_FILE_LOG"
find "${REF}" \( -type f -o -type l \) -exec bash -c '. /usr/local/bin/jenkins-support; for arg; do copy_reference_file "$arg"; done' _ {}
每當您從該ENTRYPOINT映像啟動容器時（在您在命令列上提供的任何命令之前），腳本就會運行。
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