Docker是一種容器管理服務,可以簡化構建和部署。 如果是Docker的初學者,可以通過以下連結了解詳細資訊 - /5/55/1709.html
在本章中,將看到如何通過為Spring Boot應用程式使用Maven和Gradle依賴項來建立Docker映象。
首先,在目錄src/main/docker
下建立一個名為Dockerfile
的檔案,其內容如下所示。 請注意,此檔案對於建立Docker映象很重要。
FROM java:8
VOLUME /tmp
ADD dockerapp-0.0.1-SNAPSHOT.jar app.jar
RUN bash -c 'touch /app.jar'
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
對於Maven,將Docker Maven外掛新增到構建組態檔案pom.xml 中,
<properties>
<docker.image.prefix>spring-boot-yiibai</docker.image.prefix>
</properties>
<build>
<plugins>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>
<imageName>${docker.image.prefix}/${project.artifactId}</imageName>
<dockerDirectory>src/main/docker</dockerDirectory>
<resources>
<resource>
<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>
</plugin>
</plugins>
</build>
完整的pom.xml 檔案如下 -
<?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>com.yiibai</groupId>
<artifactId>dockerapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>dockerapp</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<docker.image.prefix>spring-boot-yiibai</docker.image.prefix>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>
<imageName>${docker.image.prefix}/${project.artifactId}</imageName>
<dockerDirectory>src/main/docker</dockerDirectory>
<resources>
<resource>
<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>
</plugin>
</plugins>
</build>
</project>
現在,可以使用Maven命令mvn package docker:build
來執行應用程式
註 - 在沒有TLS的情況下在tcp://localhost:2375
上啟用Expose守護程式。
構建成功後,可以在控制台上看到輸出,如下所示 -
現在,通過命令使用docker images
命令來檢視Docker映象,並在控制台上檢視映象資訊。
要使用Gradle構建組態構建Docker映象,需要新增docker外掛並需要編寫任務buildDocker來建立Docker映象。
Gradle Docker組態的程式碼如下。
buildscript {
.....
dependencies {
.....
classpath('se.transmode.gradle:gradle-docker:1.2')
}
}
group = 'spring-boot-yiibai'
.....
apply plugin: 'docker'
task buildDocker(type: Docker, dependsOn: build) {
applicationName = jar.baseName
dockerfile = file('src/main/docker/Dockerfile')
doFirst {
copy {
from jar
into stageDir
}
}
}
完整的 build.gradle 檔案如下所示。
buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath('se.transmode.gradle:gradle-docker:1.2')
}
}
group = 'spring-boot-yiibai'
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'docker'
group = 'com.yiibai'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
task buildDocker(type: Docker, dependsOn: build) {
applicationName = jar.baseName
dockerfile = file('src/main/docker/Dockerfile')
doFirst {
copy {
from jar
into stageDir
}
}
}
現在,使用下面命令建立Docker映象 -
gradle build buildDocker
執行該命令後,可以在控制台視窗中看到BUILD SUCCESSFUL 紀錄檔。