基于K8s的CI/CD实现（三，jenkins部署）

本次cicd中，将jenkins通过helm也部署在集群中，而Jenkins又需要持久化数据，所以需要定义存储类，来保证数据不会丢失。

那么就基于NFS定义一个存储类。首先把nfs下载下来，我把存储卷的地址放在了master节点上的/mnt目录下

由于官方的jenkins时间不同步在加上插件下载失败，所以使用Dockerfile自己构建一个jenkins镜像来使用。首先去下载一下官方的jenkins（“https://github.com/jenkinsci/docker”），下不下来，手动下载后传至服务器中并解压，目录内容如下

编写Dockerfile，全文为：

FROM openjdk:8-jdk-alpine

ENV LANG=C.UTF-8 \
    TZ=Asia/Shanghai


RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories && apk add --no-cache \
  bash \
  coreutils \
  curl \
  git \
  git-lfs \
  openssh-client \
  tini \
  ttf-dejavu \
  tzdata \
  unzip

ARG user=jenkins
ARG group=jenkins
ARG uid=1000
ARG gid=1000
ARG http_port=8080
ARG agent_port=50000
ARG JENKINS_HOME=/var/jenkins_home
ARG REF=/usr/share/jenkins/ref

ENV JENKINS_HOME $JENKINS_HOME
ENV JENKINS_SLAVE_AGENT_PORT ${agent_port}
ENV REF $REF

# Jenkins is run with user `jenkins`, uid = 1000
# If you bind mount a volume from the host or a data container,
# ensure you use the same uid
RUN mkdir -p $JENKINS_HOME \
  && chown ${uid}:${gid} $JENKINS_HOME \
  && addgroup -g ${gid} ${group} \
  && adduser -h "$JENKINS_HOME" -u ${uid} -G ${group} -s /bin/bash -D ${user}

# Jenkins home directory is a volume, so configuration and build history
# can be persisted and survive image upgrades
VOLUME $JENKINS_HOME

# $REF (defaults to `/usr/share/jenkins/ref/`) contains all reference configuration we want
# to set on a fresh new installation. Use it to bundle additional plugins
# or config file with your custom jenkins Docker image.
RUN mkdir -p ${REF}/init.groovy.d

# jenkins version being bundled in this docker image
ARG JENKINS_VERSION
ENV JENKINS_VERSION ${JENKINS_VERSION:-2.222.4}

# jenkins.war checksum, download will be validated using it
ARG JENKINS_SHA=6c95721b90272949ed8802cab8a84d7429306f72b180c5babc33f5b073e1c47c

# Can be used to customize where jenkins.war get downloaded from
ARG JENKINS_URL=https://mirrors.aliyun.com/jenkins/war-stable/${JENKINS_VERSION}/jenkins.war

# could use ADD but this one does not check Last-Modified header neither does it allow to control checksum
# see https://github.com/docker/docker/issues/8331
RUN curl -fsSL ${JENKINS_URL} -o /usr/share/jenkins/jenkins.war \
  && echo "${JENKINS_SHA}  /usr/share/jenkins/jenkins.war" | sha256sum -c -

ENV JENKINS_UC https://updates.jenkins-zh.cn
ENV JENKINS_UC_EXPERIMENTAL=https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/experimental
ENV JENKINS_INCREMENTALS_REPO_MIRROR=https://repo.jenkins-ci.org/incrementals
RUN chown -R ${user} "$JENKINS_HOME" "$REF"

# for main web interface:
EXPOSE ${http_port}

# will be used by attached slave agents:
EXPOSE ${agent_port}

ENV COPY_REFERENCE_FILE_LOG $JENKINS_HOME/copy_reference_file.log

USER ${user}

COPY jenkins-support /usr/local/bin/jenkins-support
COPY jenkins.sh /usr/local/bin/jenkins.sh
COPY tini-shim.sh /bin/tini
ENTRYPOINT ["/sbin/tini", "--", "/usr/local/bin/jenkins.sh"]

# from a derived Dockerfile, can use `RUN plugins.sh active.txt` to setup $REF/plugins from a support bundle
COPY plugins.sh /usr/local/bin/plugins.sh
COPY install-plugins.sh /usr/local/bin/install-plugins.sh

这个Dockerfile是基于jdk8，且时区设置为上海，然后通过ARG设置初始的一些变量，之后再创建了jenkins用户和用户组，并设置jnekins_home的属主属组改为jenkins，以便后续存储密码，插件等各种jenkins的数据。然后将jenkins的更新源设为国内的清华源，防止更新失败。然后将端口暴露出去，用来网页访问。最后运行两个官方提供的脚本。这两个脚本就在下载下来的包中，把他们移出来，然后构建自己的jenkins镜像。