docker上構建eureka-server鏡像並運行

構建前提條件

編程環境ubuntu，jdk8，maven，已可以使用mvn在本地成功運行的spring-boot工程的eureka-server

步驟1 安裝docker

開始安裝

由於apt官方庫裏的docker版本可能比較舊，所以先卸載可能存在的舊版本：

$ sudo apt-get remove docker docker-engine docker-ce docker.io

更新apt包索引：

$ sudo apt-get update

安裝以下包以使apt可以通過HTTPS使用存儲庫（repository）：

$ sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common

添加Docker官方的GPG密鑰：

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

使用下面的命令來設置stable存儲庫：

$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

再更新一下apt包索引：

$ sudo apt-get update

安裝最新版本的Docker CE：

$ sudo apt-get install -y docker-ce

驗證docker

查看docker服務是否啓動：

$ systemctl status docker

若未啓動，則啓動docker服務：

$ sudo systemctl start docker

步驟2 配置spring-boot工程對docker的依賴

1.配置pom.xml文件，文件全景

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

 

<groupId>org.demo</groupId>

<artifactId>eureka</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>jar</packaging>

 

<name>Eureka Server</name>

<description>Eureka Server demo project</description>

 

<parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>2.0.2.RELEASE</version>

<relativePath/> <!-- lookup parent from repository -->

</parent>

 

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-config</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

<scope>test</scope>

</dependency>

</dependencies>

 

<dependencyManagement>

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-dependencies</artifactId>

<version>Finchley.BUILD-SNAPSHOT</version>

<type>pom</type>

<scope>import</scope>

</dependency>

</dependencies>

</dependencyManagement>

 

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<start-class>eurekademo.EurekaApplication</start-class>

<java.version>1.8</java.version>

<docker.image.prefix>springcloud</docker.image.prefix>

</properties>

<build>

<plugins>

<plugin>

<groupId>com.spotify</groupId>

<artifactId>docker-maven-plugin</artifactId>

<version>0.2.3</version>

<configuration>

<imageName>${project.artifactId}:${project.version}</imageName>

<dockerDirectory>${project.basedir}/src/main/resources</dockerDirectory>

<!-- <baseImage>openjdk:8-jre-alpine</baseImage>

<imageName>${docker.image.prefix}/${project.artifactId}</imageName>

<exposes>8761</exposes>

<entryPoint>["java", "-Djava.security.egd=file:/dev/./urandom", "-jar", "/${project.build.finalName}.jar"]</entryPoint>

--> <resources>

<resource>

<targetPath>/</targetPath>

<directory>${project.build.directory}</directory>

<include>${project.build.finalName}.jar</include>

</resource>

</resources>

</configuration>

</plugin>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

<!-- defined in spring-cloud-starter-parent pom (as documentation hint),

but needs to be repeated here -->

<configuration>

<requiresUnpack>

<dependency>

<groupId>com.netflix.eureka</groupId>

<artifactId>eureka-core</artifactId>

</dependency>

<dependency>

<groupId>com.netflix.eureka</groupId>

<artifactId>eureka-client</artifactId>

</dependency>

</requiresUnpack>

</configuration>

</plugin>

<plugin>

<groupId>pl.project13.maven</groupId>

<artifactId>git-commit-id-plugin</artifactId>

<configuration>

<failOnNoGitDirectory>false</failOnNoGitDirectory>

</configuration>

</plugin>

<plugin>

<!--skip deploy (this is just a test module) -->

<artifactId>maven-deploy-plugin</artifactId>

<configuration>

<skip>true</skip>

</configuration>

</plugin>

</plugins>

</build>

 

<repositories>

<repository>

<id>spring-snapshots</id>

<name>Spring Snapshots</name>

<url>https://repo.spring.io/libs-snapshot</url>

<snapshots>

<enabled>true</enabled>

</snapshots>

</repository>

<repository>

<id>spring-milestones</id>

<name>Spring Milestones</name>

<url>https://repo.spring.io/libs-milestone</url>

<snapshots>

<enabled>false</enabled>

</snapshots>

</repository>

<repository>

<id>spring-releases</id>

<name>Spring Releases</name>

<url>https://repo.spring.io/libs-release</url>

<snapshots>

<enabled>false</enabled>

</snapshots>

</repository>

</repositories>

<pluginRepositories>

<pluginRepository>

<id>spring-snapshots</id>

<name>Spring Snapshots</name>

<url>https://repo.spring.io/libs-snapshot-local</url>

<snapshots>

<enabled>true</enabled>

</snapshots>

</pluginRepository>

<pluginRepository>

<id>spring-milestones</id>

<name>Spring Milestones</name>

<url>https://repo.spring.io/libs-milestone-local</url>

<snapshots>

<enabled>false</enabled>

</snapshots>

</pluginRepository>

</pluginRepositories>

 

</project>

文件中的 <imageName>${project.artifactId}:${project.version}</imageName>

<dockerDirectory>${project.basedir}/src/main/resources</dockerDirectory>

表示生成的docker image的名稱，和dockerfile的路徑，配置好後，在設置的路徑下新建Dockerfile文件，注意文件沒有後綴名

文件內的代碼如下：

#基於哪個鏡像

FROM java:8

# 將本地文件夾掛載到當前容器

VOLUME /tmp

# 拷貝文件到容器，也可以直接寫成ADD chu-eureka-0.0.1-SNAPSHOT.jar /app.jar

ADD eureka-0.0.1-SNAPSHOT.jar app.jar

RUN bash -c 'touch /app.jar'

#環境變量 設置上海時區

ENV TZ=Asia/Shanghai

RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

# 開放8761端口

EXPOSE 8761

# 配置容器啓動後執行的命令

ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

步驟3 構建指令

將eureak打包

mvn clean package -Dmaven.test.skip=true

docker構建鏡像，注意要使用root用戶進行構建，防止構建過程中出現權限不夠的情況。查看上一步生成的jar的文件名稱，在Dockerfile文件中將ADD後面的jar改爲相應生成的文件名稱。

mvn clean package -Dmaven.test.skip=true docker:build

查看構建是否成功

docker images

步驟4 運行鏡像

sudo docker run -p 8080:8080 -d demo:0.0.1-SNAPSHOT

其中的8080端口號，是application。properties文件中設置的端口號。