一、概述
Git:一个开源的分布式版本控制系统,可以有效、高速地处理从很小到非常大的项目版本管理。
Jenkins:一个开源软件项目,是基于Java开发的一种持续集成工具,用于监控持续重复的工作。
Maven:项目对象模型(POM),可以通过一小段描述信息来管理项目的构建,报告和文档的项目管理工具软件。
Harbor:构建企业级私有Docker镜像的仓库的开源解决方案。
Kubernetes:一个开源的,用于管理云平台中多个主机上的容器化的应用。
二、Java镜像构建
启动脚本run.sh:
#!/bin/sh
java ${JVM_OPTS} ${JAVA_OPTS} -jar *.jar ${CLI_OPTS} 2>&1 | tee -a ${OUTPUT}
构建脚本Dockerfile:
复制代码
# 基础镜像
FROM hub.jhmy.com/base/centos
# 维护者
MAINTAINER leozhang
# 切换目录
WORKDIR /root
# 添加环境变量
ENV JDK_VERSION=jdk1.8.0_191
ENV JAVA_HOME=/usr/local/$JDK_VERSION
ENV PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/lib/
ENV JAVA_OPTS='' CLI_OPTS='' OUTPUT='logs/output.log'
ENV JVM_OPTS='-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:MaxRAMFraction=2'
# 设置时区语言
ENV TZ='Asia/Shanghai'
ENV LANG='C.UTF-8' LANGUAGE='C.UTF-8' LC_ALL='C.UTF-8'
# 添加程序包
ADD $JDK_VERSION.tar.gz /usr/local/
COPY run.sh .
# 执行命令
RUN chmod a+x run.sh && rm -rf `ls | grep -v "^run.sh$"` && mkdir -p /root/logs
# 构建镜像示例
# docker build -t hub.jhmy.com/base/java:1.8 .
# 启动容器示例
# docker run -dit --name=java hub.jhmy.com/base/java:1.8
复制代码
环境变量说明:
JDK_VERSION:用于指定jdk包版本(需要提前下载好jdk软件包,且保证解压后名称一致)
JVM_OPTS:用于指定jvm运行参数
JAVA_OPTS:用于指定java自定义参数
CLI_OPTS:用于指定其他命令行参数
OUTPUT:用于指定服务运行日志保存路径
注意:
-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:MaxRAMFraction=2
用于jvm自动识别容器内存限制以及自动分配内存大小(jdk10版本之后则不需要设置)
更多详情>>>容器中的JVM资源该如何被安全的限制?
三、Java项目镜像构建
增加项目依赖脚本addPlugins.py:
复制代码
# -*- coding:utf-8 -*-
# ****************************
# Author :leozhang
# Date :2020/7/16
# File :addPlugins.py
# Description :增加POM文件依赖
# ****************************
import os
pomplug=os.environ["PLUGINS"]
newpom = ""
with open("pom.xml", "r+") as fp:
for line in fp.readlines():
if(line.find("<build>") != -1):
line += "\n" + pomplug + "\n"
newpom += line
with open("pom.xml", "r+") as f:
f.write(newpom)print(newpom)
复制代码
构建脚本Dockerfile:
复制代码
# 基础镜像
FROM hub.jhmy.com/base/java:1.8
# 维护者
MAINTAINER leozhang
# 工作目录
WORKDIR /root
# 复制文件到镜像
COPY *.jar .
COPY lib/ lib/
# 查看当前目录
RUN ls -l .
# 容器启动时运行命令
CMD ["./run.sh"]
# 构建镜像示例
# docker build -t hub.jhmy.com/test/appservice .
# 启动容器示例
# docker run -dit --name=appservice hub.jhmy.com/test/appservice
复制代码
镜像构建脚本buildImage.sh:
复制代码
#!/bin/sh
# creator: leozhang
# up-date: 2020/03/21
# description: buildImage.sh
# 公共参数
env=$1
name=$2
tag=$3
file=$4
# 设置仓库地址和账户
harbor=hub.jhmy.com
username=jenkins
password=$(echo Q2hpc2NkY0AxMjMK | base64 -d)
# 修改镜像名称为小写
image=${harbor}/${env}/$(echo ${name} | tr '[A-Z]' '[a-z]')
# 默认名Dockerfile
if [ ! "${file}" ] ;then
file=Dockerfile
fi
# 构建镜像
echo "************* build image ***************"
docker build -t ${image}:${tag} -f ${file} .
echo "************* push image ***************"
# 登录仓库
docker login -u ${username} -p ${password} https://${harbor}
# 上传镜像
docker push ${image}:${tag}
# 如果非latest标签,则更新latest标签镜像
if [ "${tag}" != "latest" ]; then
docker tag ${image}:${tag} ${image}:latest
docker push ${image}:latest
fi
# 登出仓库
docker logout https://${harbor}
复制代码
四、Java项目容器化部署
Deployment文件:
复制代码
apiVersion: apps/v1 # 资源版本
kind: Deployment #资源类型
metadata: #资源元数据:名称、命名空间等
name: appservice
namespace: default
spec:
replicas: 3 #副本数
selector: #选择器
matchLabels:
app: appservice
template: #Pod模板
metadata: #Pod元数据:标签、注解等
labels:
app: appservice
annotations:
version: "20200715"
spec: #Pod配置:名称、镜像、拉取策略、端口等
containers:
- name: appservice
image: hub.jhmy.com/test/appservice:latest
imagePullPolicy: Always
env: #环境变量
- name: JAVA_OPTS
value: "-Dprops=/root/appservice.properties -Dlogpath=/root/logs"
ports:
- name: dubbo
containerPort: 20114
resources: #资源限制:cpu、mem
limits:
memory: 2Gi
cpu: 1
livenessProbe: #就绪检测&生存检测:初始时间、超时、检测方式等
initialDelaySeconds: 60
timeoutSeconds: 10
tcpSocket:
port: 20114
readinessProbe:
initialDelaySeconds: 20
timeoutSeconds: 10
tcpSocket:
port: 20114
volumeMounts: #存储挂载
- name: config
mountPath: /root/appservice.properties
subPath: appservice.properties
- name: log
mountPath: /root/logs
volumes: #存储声明:服务配置、持久化存储请求、本地存储
- name: config
configMap:
name: appservice
- name: log
hostPath:
path: /home/ymt/logs/appservice
type: DirectoryOrCreate
#affinity: #节点亲和性
# nodeAffinity:
# requiredDuringSchedulingIgnoredDuringExecution:
# nodeSelectorTerms:
# - matchExpressions:
# - key: app
# operator: In
# values:
# - appservice
复制代码
ConfigMap文件:
复制代码
apiVersion: v1
kind: ConfigMap
metadata:
name: appservice
namespace: default
data:
appservice.properties: |-
server.port=20114
......
......
......
复制代码
Service文件:
复制代码
apiVersion: v1
kind: Service
metadata:
name: apprestserver
namespace: default
spec:
selector:
app: apprestserver
ports:
- name: rest
port: 20114
复制代码
五、Jenkins持续部署
Pipeline任务脚本:
复制代码
def NOW = new Date().format("yyyyMMddHHmmss")
def SERVER = env.JOB_BASE_NAME.toLowerCase()
pipeline {
agent any
// parameters {
// string(name: 'TAG', defaultValue: 'latest', description: '镜像标签' )
// string(name: 'BRANCH', defaultValue: 'test_0629', description: '分支名称' )
// string(name: 'URL', defaultValue: 'http://10.88.88.226:8090/jhmy/source/wx_v1/appdataservicetemp.git', description: '项目地址' )
// string(name: 'PLUGINS', defaultValue: '<plugins> <plugin> ...... </plugin> </plugins> ', description: '相关依赖' )
//
environment {
ENV="test"
MVN="/application/mvnBranch/bin/mvn"
SCRIPT="${JENKINS_HOME}/workspace/Docker/updateConfigs/script"
}
stages {
stage('Git Clone') {
steps {
git branch: '${BRANCH}', credentialsId: 'yf3b_gitlab', url: '${URL}'
}
}
stage('Clean Package') {
steps {
sh "python ${SCRIPT}/addPlugins.py"
sh "${MVN} clean package -Dmaven.test.skip=true"
}
post { success { archiveArtifacts "target/*.jar" } }
}
stage('Build Image') {
steps {
dir('target') {
sh "cp ${SCRIPT}/Dockerfile-jar Dockerfile"
sh "sh ${SCRIPT}/buildImage.sh ${ENV} ${SERVER} ${TAG}"
}
}
}
stage('Rolling Update') {
steps {
sh "kubectl config use-context k8s-ymt"
sh """kubectl patch deployment ${SERVER} --patch '{"spec":{"template":{"metadata":{"annotations":{"version":"${NOW}"}}}}}'"""
sh "sleep 30 && kubectl get pod -o wide | grep ${SERVER}"
}
}
stage('Clean up') {
steps { deleteDir() }
}
}
}
复制代码
作者:Leozhanggg