Spring Boot 2.3.0の新機能としてDocker Supportがあったので試してみました。
環境は
- Mac 10.15.4
- Docker 19.03.8
です。
使用方法
使い方としてはMavenだと以下を実行するだけです。
$ mvn spring-boot:build-image
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building demo 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
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︙
︙
[INFO] --- spring-boot-maven-plugin:2.3.0.RELEASE:build-image (default-cli) @ demo ---
[INFO] Building image 'docker.io/library/demo:0.0.1-SNAPSHOT'
[INFO]
[INFO] > Pulling builder image 'gcr.io/paketo-buildpacks/builder:base-platform-api-0.3' 100%
[INFO] > Pulled builder image 'gcr.io/paketo-buildpacks/builder@sha256:7996dd44d157f656bdea4f1063760ad8d4eae2dd41465f7fe6bf720f5b25ca4d'
[INFO] > Pulling run image 'gcr.io/paketo-buildpacks/run:base-cnb' 100%
[INFO] > Pulled run image 'gcr.io/paketo-buildpacks/run@sha256:15bccd9803f63b20a38a6834821a74d9c3949eb475cf759446047dc9586ca2a9'
[INFO] > Executing lifecycle version v0.7.5
[INFO] > Using build cache volume 'pack-cache-5cbe5692dbc4.build'
[INFO]
[INFO] > Running creator
[INFO] [creator] ---> DETECTING
[INFO] [creator] 5 of 15 buildpacks participating
[INFO] [creator] paketo-buildpacks/bellsoft-liberica 2.5.3
[INFO] [creator] paketo-buildpacks/executable-jar 1.2.3
[INFO] [creator] paketo-buildpacks/apache-tomcat 1.1.3
[INFO] [creator] paketo-buildpacks/dist-zip 1.3.0
[INFO] [creator] paketo-buildpacks/spring-boot 1.5.3
[INFO] [creator] ---> ANALYZING
[INFO] [creator] Previous image with name "docker.io/library/demo:0.0.1-SNAPSHOT" not found
[INFO] [creator] ---> RESTORING
[INFO] [creator] ---> BUILDING
[INFO] [creator]
[INFO] [creator] Paketo BellSoft Liberica Buildpack 2.5.3
[INFO] [creator] Set $BPL_JVM_HEAD_ROOM to configure the headroom in memory calculation. Default 0.
[INFO] [creator] Set $BPL_JVM_LOADED_CLASS_COUNT to configure the number of loaded classes in memory calculation. Default 35% of classes.
[INFO] [creator] Set $BPL_JVM_THREAD_COUNT to configure the number of threads in memory calculation. Default 250.
[INFO] [creator] Set $BP_JVM_VERSION to configure the Java version. Default 11.*.
[INFO] [creator] BellSoft Liberica JRE 11.0.7: Contributing to layer
[INFO] [creator] Downloading from https://github.com/bell-sw/Liberica/releases/download/11.0.7+10/bellsoft-jre11.0.7+10-linux-amd64.tar.gz
[INFO] [creator] Verifying checksum
[INFO] [creator] Expanding to /layers/paketo-buildpacks_bellsoft-liberica/jre
[INFO] [creator] Writing env.launch/JAVA_HOME.override
[INFO] [creator] Writing env.launch/MALLOC_ARENA_MAX.override
[INFO] [creator] Writing profile.d/active-processor-count.sh
[INFO] [creator] Memory Calculator 4.0.0: Contributing to layer
[INFO] [creator] Downloading from https://github.com/cloudfoundry/java-buildpack-memory-calculator/releases/download/v4.0.0/memory-calculator-4.0.0.tgz
[INFO] [creator] Verifying checksum
[INFO] [creator] Expanding to /layers/paketo-buildpacks_bellsoft-liberica/memory-calculator
[INFO] [creator] Writing profile.d/memory-calculator.sh
[INFO] [creator] Class Counter: Contributing to layer
[INFO] [creator] Copying to /layers/paketo-buildpacks_bellsoft-liberica/class-counter
[INFO] [creator] JVMKill Agent 1.16.0: Contributing to layer
[INFO] [creator] Downloading from https://github.com/cloudfoundry/jvmkill/releases/download/v1.16.0.RELEASE/jvmkill-1.16.0-RELEASE.so
[INFO] [creator] Verifying checksum
[INFO] [creator] Copying to /layers/paketo-buildpacks_bellsoft-liberica/jvmkill
[INFO] [creator] Writing env.launch/JAVA_OPTS.append
[INFO] [creator] Link-Local DNS: Contributing to layer
[INFO] [creator] Copying to /layers/paketo-buildpacks_bellsoft-liberica/link-local-dns
[INFO] [creator] Writing profile.d/link-local-dns.sh
[INFO] [creator] Java Security Properties: Contributing to layer
[INFO] [creator] Writing env.launch/JAVA_OPTS.append
[INFO] [creator] Writing env.launch/JAVA_SECURITY_PROPERTIES.override
[INFO] [creator] Security Providers Configurer: Contributing to layer
[INFO] [creator] Copying to /layers/paketo-buildpacks_bellsoft-liberica/security-providers-configurer
[INFO] [creator] Writing profile.d/security-providers-classpath.sh
[INFO] [creator] Writing profile.d/security-providers-configurer.sh
[INFO] [creator] OpenSSL Security Provider 1.0.2: Contributing to layer
[INFO] [creator] Downloading from https://jitpack.io/com/github/paketo-buildpacks/openssl-security-provider/1.0.2/openssl-security-provider-1.0.2.jar
[INFO] [creator] Verifying checksum
[INFO] [creator] Copying to /layers/paketo-buildpacks_bellsoft-liberica/openssl-security-provider
[INFO] [creator] Writing env.launch/SECURITY_PROVIDERS.append
[INFO] [creator] Writing env.launch/SECURITY_PROVIDERS_CLASSPATH
[INFO] [creator] Writing profile.d/openssl-security-provider.sh
[INFO] [creator]
[INFO] [creator] Paketo Executable JAR Buildpack 1.2.3
[INFO] [creator] Writing env.launch/CLASSPATH
[INFO] [creator] Process types:
[INFO] [creator] executable-jar: java -cp "${CLASSPATH}" ${JAVA_OPTS} org.springframework.boot.loader.JarLauncher
[INFO] [creator] task: java -cp "${CLASSPATH}" ${JAVA_OPTS} org.springframework.boot.loader.JarLauncher
[INFO] [creator] web: java -cp "${CLASSPATH}" ${JAVA_OPTS} org.springframework.boot.loader.JarLauncher
[INFO] [creator]
[INFO] [creator] Paketo Spring Boot Buildpack 1.5.3
[INFO] [creator] Image labels:
[INFO] [creator] org.opencontainers.image.title
[INFO] [creator] org.opencontainers.image.version
[INFO] [creator] org.springframework.boot.spring-configuration-metadata.json
[INFO] [creator] org.springframework.boot.version
[INFO] [creator] ---> EXPORTING
[INFO] [creator] Adding layer 'launcher'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:class-counter'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:java-security-properties'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:jre'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:jvmkill'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:link-local-dns'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:memory-calculator'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:openssl-security-provider'
[INFO] [creator] Adding layer 'paketo-buildpacks/bellsoft-liberica:security-providers-configurer'
[INFO] [creator] Adding layer 'paketo-buildpacks/executable-jar:class-path'
[INFO] [creator] Adding 1/1 app layer(s)
[INFO] [creator] Adding layer 'config'
[INFO] [creator] *** Images (3f95a912b231):
[INFO] [creator] docker.io/library/demo:0.0.1-SNAPSHOT
[INFO]
[INFO] Successfully built image 'docker.io/library/demo:0.0.1-SNAPSHOT'
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 05:06 min
[INFO] Finished at: 2020-05-16T06:00:03+09:00
[INFO] Final Memory: 47M/150M
[INFO] ------------------------------------------------------------------------
これでDockerイメージが出来上がるのですが、確認すると「あれ？無い」とちょっと焦りました。
新しく作成されたイメージが先頭に表示される筈なのが、よく見たら末尾にありました。
何故かCREATEDが40年前です。。。
$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
gcr.io/paketo-buildpacks/run base-cnb 41080a961a76 31 hours ago 71.1MB
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demo 0.0.1-SNAPSHOT 3f95a912b231 40 years ago 262MB
gcr.io/paketo-buildpacks/builder base-platform-api-0.3 2ca41db2c654 40 years ago 894MB
作成されるDockerイメージのリポジトリ名はpom.xmlに書いたartifactIdが、バージョンはversionが使われるようです。
なお、
- gcr.io/paketo-buildpacks/builder:base-platform-api-0.3
- Dockerイメージを作成するビルダーで、org.springframework.boot:spring-boot-maven-plugin:2.3.0.RELEASEに定義されているデフォルトのビルダーです。
- gcr.io/paketo-buildpacks/run:base-cnb
- demo:0.0.1-SNAPSHOTのレイヤーのハッシュ値と照合した結果から、これが基底のイメージです。
でした。
あとはお好みのオプションで起動するだけです。
$ sudo docker run -d -p 8080:8080 demo:0.0.1-SNAPSHOT
コンテナ内部
リリース通知にも書いてありましたが、このDocker SupportはPaket Buildpacksを利用しています。
実行中のコンテナに入ってみます。
- OS
$ cat /etc/debian_version
buster/sid
Debian 10でした。
- プロセス
＄ ps auxww
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
cnb 1 1.6 7.4 1150548 151396 ? Ssl 02:47 0:16 java -cp /workspace:/layers/paketo-buildpacks_bellsoft-liberica/openssl-security-provider/openssl-security-provider-1.0.2.jar -Djava.security.properties=/layers/paketo-buildpacks_bellsoft-liberica/java-security-properties/java-security.properties -agentpath:/layers/paketo-buildpacks_bellsoft-liberica/jvmkill/jvmkill-1.16.0-RELEASE.so=printHeapHistogram=1 -XX:ActiveProcessorCount=4 -XX:MaxDirectMemorySize=10M -XX:MaxMetaspaceSize=88261K -XX:ReservedCodeCacheSize=240M -Xss1M -Xmx448314K -Dio.paketo.openssl.ca-certificates=/etc/ssl/certs/ca-certificates.crt org.springframework.boot.loader.JarLauncher
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$ ls /workspace
BOOT-INF META-INF org
workspaceフォルダにSpring Bootのjarが解凍された状態で格納されてました。
Java VMオプションを指定する
今までは手動でDockerfileを書いていたので、-Dspring.profiles.active=productionでSpringのプロファイルを切り替えてました。
しかし、mvn spring-boot:build-imageではDockerfileが不要なのでプロファイルの変更方法が判りません。
Spring Boot Maven Plugin Documentationにも、それらしきカスタマイズ方法が見つかりませんでした。
- こちらを参考にJAVA_OPTSを指定してみたのですが、駄目でした。
試行錯誤の末、単に docker run時の環境変数オプションとして JAVA_OPTS を指定することで実現できることが判りました。
$ sudo docker run -d -p 8080:8080 -e JAVA_OPTS=-Dspring.profiles.active=production demo:0.0.1-SNAPSHOT
b495ca243276a485317fd4b392cdf0f446224e62ed935cc745371cdd8c398d4c
$ sudo docker exec -it b495ca243276 bash
$ ps auxww
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
cnb 1 21.1 8.3 1153308 170592 ? Ssl 07:01 0:11 java -cp /workspace:/layers/paketo-buildpacks_bellsoft-liberica/openssl-security-provider/openssl-security-provider-1.0.2.jar -Dspring.profiles.active=production -Djava.security.properties=/layers/paketo-buildpacks_bellsoft-liberica/java-security-properties/java-security.properties -agentpath:/layers/paketo-buildpacks_bellsoft-liberica/jvmkill/jvmkill-1.16.0-RELEASE.so=printHeapHistogram=1 -XX:ActiveProcessorCount=4 -XX:MaxDirectMemorySize=10M -XX:MaxMetaspaceSize=88261K -XX:ReservedCodeCacheSize=240M -Xss1M -Xmx448314K -Dio.paketo.openssl.ca-certificates=/etc/ssl/certs/ca-certificates.crt org.springframework.boot.loader.JarLauncher
他のオプションが上書きされずに -Dspring.profiles.active=production が追加されていることも確認できました。