##環境や前提条件
windows10 pro 1803
PowerShell
Docker 18.09.0
jenkins:2.19.4
##モチベーション
jenkinsのImageをpullしてくると、そのベースになっているlinuxのことを全く意識しなくてよいのだが、気になったので調べてみた。
コンテナにログイン
PS C:\docker\jenkins> docker exec -i -t myjenkins-3 bash
ディストリビューション名の確認→Debian 8ということがわかる。
jenkins@df7311076006:/$ cat /etc/issue
Debian GNU/Linux 8 \n \l
Debianのバージョンは8.6
jenkins@df7311076006:/etc$ cat /etc/debian_version
8.6
unameでバージョン確認
jenkins@df7311076006:/$ uname -a
Linux df7311076006 4.9.125-linuxkit #1 SMP Fri Sep 7 08:20:28 UTC 2018 x86_64 GNU/Linux
意味は以下の通り。
- Linux：OS名
- df7311076006：ノード名
- 4.9.125-linuxkit：OSのリリース
- #1 SMP Fri Sep 7 08:20:28 UTC 2018：OSのバージョン
- x86_64：マシンおよびハードウェアの名称
- GNU/Linux
docker historyでImageがどのように作られたかの履歴を確認。
PS C:\docker\jenkins> docker history --no-trunc myjenkins:1
IMAGE CREATED CREATED BY SIZE COMMENT
sha256:f61635651954adb853e95690b04dd3791e4fdbcfab7bfb66a2d505e31f3df31c 2 years ago /bin/sh -c #(nop) COPY file:2a6a3e16202b8dddab5edef50f712c16fe8f6980f5aea80c8c76b5db4f903913 in /usr/local/bin/install-plugins.sh 5.96kB
<missing> 2 years ago /bin/sh -c #(nop) COPY file:93fb511d485dd2d6060c484dcedb902947875042048de529676a0a0aed27b5a3 in /usr/local/bin/plugins.sh 3.92kB
<missing> 2 years ago /bin/sh -c #(nop) ENTRYPOINT ["/bin/tini" "--" "/usr/local/bin/jenkins.sh"] 0B
<missing> 2 years ago /bin/sh -c #(nop) COPY file:7eec179a0dd3aad4a9c9290bc4d85e4775c8cf6bc2932527892ca6e87739e474 in /usr/local/bin/jenkins.sh 1.21kB
<missing> 2 years ago /bin/sh -c #(nop) COPY file:26c3c5818bc87662d1f4905a3ed73bd55a0a75f731c7dc52d0599c00f51408e9 in /usr/local/bin/jenkins-support 5kB
<missing> 2 years ago /bin/sh -c #(nop) USER [jenkins] 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV COPY_REFERENCE_FILE_LOG=/var/jenkins_home/copy_reference_file.log 0B
<missing> 2 years ago /bin/sh -c #(nop) EXPOSE 50000/tcp 0B
<missing> 2 years ago /bin/sh -c #(nop) EXPOSE 8080/tcp 0B
<missing> 2 years ago |6 JENKINS_SHA=ea61a4ff86f0db715511d1118a4e2f0a6a0311a1 JENKINS_URL=https://repo.jenkins-ci.org/public/org/jenkins-ci/main/jenkins-war/2.19.4/jenkins-war-2.19.4.war gid=1000 group=jenkins uid=1000 user=jenkins /bin/sh -c chown -R ${user} "$JENKINS_HOME" /usr/share/jenkins/ref 328B
<missing> 2 years ago /bin/sh -c #(nop) ENV JENKINS_UC=https://updates.jenkins.io 0B
<missing> 2 years ago |6 JENKINS_SHA=ea61a4ff86f0db715511d1118a4e2f0a6a0311a1 JENKINS_URL=https://repo.jenkins-ci.org/public/org/jenkins-ci/main/jenkins-war/2.19.4/jenkins-war-2.19.4.war gid=1000 group=jenkins uid=1000 user=jenkins /bin/sh -c curl -fsSL ${JENKINS_URL} -o /usr/share/jenkins/jenkins.war && echo "${JENKINS_SHA} /usr/share/jenkins/jenkins.war" | sha1sum -c - 69.8MB
<missing> 2 years ago /bin/sh -c #(nop) ARG JENKINS_URL=https://repo.jenkins-ci.org/public/org/jenkins-ci/main/jenkins-war/2.19.4/jenkins-war-2.19.4.war 0B
<missing> 2 years ago /bin/sh -c #(nop) ARG JENKINS_SHA=ea61a4ff86f0db715511d1118a4e2f0a6a0311a1 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV JENKINS_VERSION=2.19.4 0B
<missing> 2 years ago /bin/sh -c #(nop) ARG JENKINS_VERSION 0B
<missing> 2 years ago /bin/sh -c #(nop) COPY file:c629bc0b9ecb5b7233000c973f65721df4ce1307a5d5b33ac3871ff61a9172ff in /usr/share/jenkins/ref/init.groovy.d/tcp-slave-agent-port.groovy 328B
<missing> 2 years ago |4 gid=1000 group=jenkins uid=1000 user=jenkins /bin/sh -c curl -fsSL https://github.com/krallin/tini/releases/download/v${TINI_VERSION}/tini-static -o /bin/tini && chmod +x /bin/tini && echo "$TINI_SHA /bin/tini" | sha1sum -c - 823kB
<missing> 2 years ago /bin/sh -c #(nop) ENV TINI_SHA=fa23d1e20732501c3bb8eeeca423c89ac80ed452 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV TINI_VERSION=0.9.0 0B
<missing> 2 years ago |4 gid=1000 group=jenkins uid=1000 user=jenkins /bin/sh -c mkdir -p /usr/share/jenkins/ref/init.groovy.d 0B
<missing> 2 years ago /bin/sh -c #(nop) VOLUME [/var/jenkins_home] 0B
<missing> 2 years ago |4 gid=1000 group=jenkins uid=1000 user=jenkins /bin/sh -c groupadd -g ${gid} ${group} && useradd -d "$JENKINS_HOME" -u ${uid} -g ${gid} -m -s /bin/bash ${user} 335kB
<missing> 2 years ago /bin/sh -c #(nop) ARG gid=1000 0B
<missing> 2 years ago /bin/sh -c #(nop) ARG uid=1000 0B
<missing> 2 years ago /bin/sh -c #(nop) ARG group=jenkins 0B
<missing> 2 years ago /bin/sh -c #(nop) ARG user=jenkins 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV JENKINS_SLAVE_AGENT_PORT=50000 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV JENKINS_HOME=/var/jenkins_home 0B
<missing> 2 years ago /bin/sh -c apt-get update && apt-get install -y git curl && rm -rf /var/lib/apt/lists/* 0B
<missing> 2 years ago /bin/sh -c /var/lib/dpkg/info/ca-certificates-java.postinst configure 418kB
<missing> 2 years ago /bin/sh -c set -x && apt-get update && apt-get install -y openjdk-8-jdk="$JAVA_DEBIAN_VERSION" ca-certificates-java="$CA_CERTIFICATES_JAVA_VERSION" && rm -rf /var/lib/apt/lists/* && [ "$JAVA_HOME" = "$(docker-java-home)" ] 352MB
<missing> 2 years ago /bin/sh -c #(nop) ENV CA_CERTIFICATES_JAVA_VERSION=20140324 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV JAVA_DEBIAN_VERSION=8u111-b14-2~bpo8+1 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV JAVA_VERSION=8u111 0B
<missing> 2 years ago /bin/sh -c #(nop) ENV JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 0B
<missing> 2 years ago /bin/sh -c { echo '#!/bin/sh'; echo 'set -e'; echo; echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; } > /usr/local/bin/docker-java-home && chmod +x /usr/local/bin/docker-java-home 87B
<missing> 2 years ago /bin/sh -c #(nop) ENV LANG=C.UTF-8 0B
<missing> 2 years ago /bin/sh -c echo 'deb http://deb.debian.org/debian jessie-backports main' > /etc/apt/sources.list.d/jessie-backports.list 55B
<missing> 2 years ago /bin/sh -c apt-get update && apt-get install -y --no-install-recommends bzip2 unzip xz-utils && rm -rf /var/lib/apt/lists/* 1.29MB
<missing> 2 years ago /bin/sh -c apt-get update && apt-get install -y --no-install-recommends bzr git mercurial openssh-client subversion procps && rm -rf /var/lib/apt/lists/* 123MB
<missing> 2 years ago /bin/sh -c apt-get update && apt-get install -y --no-install-recommends ca-certificates curl wget && rm -rf /var/lib/apt/lists/* 44.3MB
<missing> 2 years ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B
<missing> 2 years ago /bin/sh -c #(nop) ADD file:1d214d2782eaccc743b8d683ccecf2f87f12a0ecdfbcd6fdf4943ce616f23870 in / 123MB
javaがopenjdk8.111
JENKINS_HOME=/var/jenkins_home
JENKINS_VERSION=2.19.4
などの設定をしていることがわかる。
以上、興味本位で調べてみた。番外編でした。