背景

Jenkins在hub.docker上的最新版本是基于2.60.3版本的jenkins制作的镜像。

屏幕快照 2018-11-02 上午10.11.40.png

当初始化安装插件的时候，很多的插件都无法在上面成功安装，从提示的异常信息来看，应该是jenkins在版本及插件维护上没有考虑向下兼容或者是维护得不好。

在hub.docker上给出了2.60.3版本的jenkins镜像生成的工程,所以我的思路就是不纠结于如何解决插件的兼容性问题。将镜像中的jenkins直接升级到最新版本。
备注：本人是于2018年11月1日生成的镜像，当前最新jenkins版本为：2.149

生成最新镜像

将生成镜像的工程下载到本地主机上（本人是centos）,将以sh为后缀的文件权限进行修改。

sudo chmod 777 *.sh

修改Dockerfile，主要是将下载的jenkins的war进行完整性确认的脚本注释或删除，并修改JENKINS_VERSION变量值为2.149,如下所示：

FROM openjdk:8-jdk

RUN apt-get update && apt-get install -y git curl && rm -rf /var/lib/apt/lists/*

ARG user=jenkins
ARG group=jenkins
ARG uid=1000
ARG gid=1000
ARG http_port=8080
ARG agent_port=50000

ENV JENKINS_HOME /var/jenkins_home
ENV JENKINS_SLAVE_AGENT_PORT ${agent_port}

# 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 groupadd -g ${gid} ${group} \
    && useradd -d "$JENKINS_HOME" -u ${uid} -g ${gid} -m -s /bin/bash ${user}

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

# `/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 /usr/share/jenkins/ref/init.groovy.d

ENV TINI_VERSION 0.14.0
ENV TINI_SHA 6c41ec7d33e857d4779f14d9c74924cab0c7973485d2972419a3b7c7620ff5fd

# Use tini as subreaper in Docker container to adopt zombie processes 
RUN curl -fsSL https://github.com/krallin/tini/releases/download/v${TINI_VERSION}/tini-static-amd64 -o /bin/tini && chmod +x /bin/tini \
  && echo "$TINI_SHA  /bin/tini" | sha256sum -c -

COPY init.groovy /usr/share/jenkins/ref/init.groovy.d/tcp-slave-agent-port.groovy

# jenkins version being bundled in this docker image
ARG JENKINS_VERSION
ENV JENKINS_VERSION ${JENKINS_VERSION:-2.149}

# jenkins.war checksum, download will be validated using it
ARG JENKINS_SHA=2d71b8f87c8417f9303a73d52901a59678ee6c0eefcf7325efed6035ff39372a

# Can be used to customize where jenkins.war get downloaded from
ARG JENKINS_URL=https://repo.jenkins-ci.org/public/org/jenkins-ci/main/jenkins-war/${JENKINS_VERSION}/jenkins-war-${JENKINS_VERSION}.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 

ENV JENKINS_UC https://updates.jenkins.io
ENV JENKINS_UC_EXPERIMENTAL=https://updates.jenkins.io/experimental
RUN chown -R ${user} "$JENKINS_HOME" /usr/share/jenkins/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
ENTRYPOINT ["/bin/tini", "--", "/usr/local/bin/jenkins.sh"]

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

部署

本人是基于k8s的部署，如果是docker的话，也可以参照deployment文件，配置docker run的启动参数。
deployment文件如下：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: jenkins-deployment
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      tier: jenkins
  template:
    metadata:
      labels:
        tier: jenkins
    spec:
      containers:
      - name: jenkins-container
        image: jenkins:latest
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
        - containerPort: 50000
        volumeMounts:
        - mountPath: /var/jenkins_home
          name: jenkins-home
      volumes:
      - name: jenkins-home
        hostPath:
          path: /home/dev_ops/jenkins_home

在应用deployment之前，先将挂载到宿主机的jenkins_home目录进行权限修改,再创建jenkins的deployment。

chome 777 /home/dev_ops/jenkins_home

service文件如下：

apiVersion: v1
kind: Service
metadata:
  name: jenkins-service
  namespace: default
spec:
  type: NodePort
  ports:
  - port: 8080 
    targetPort: 8080
    name: jenkins-port
    nodePort: 8080
  selector:
    tier: jenkins

启动以后，就可以正常安装插件了。

屏幕快照 2018-11-02 上午11.30.40.png