java - Jersey Grizzly HTTP 服务器在容器 docker 内关闭

Question

我正在尝试在容器内执行 Grizzly HTTP Server。

我的问题是，当我运行容器(使用 docker-compose)时，容器会在几秒钟后关闭。

这是我的服务器Dockerfile:

FROM alpine:3.5

MAINTAINER Maybe One <maybe@maybe.com>

# Java Version and other ENV
ENV JAVA_VERSION_MAJOR=8 \
    JAVA_VERSION_MINOR=102 \
    JAVA_VERSION_BUILD=14 \
    JAVA_PACKAGE=jdk \
    JAVA_JCE=standard \
    JAVA_HOME=/opt/jdk \
    PATH=${PATH}:/opt/jdk/bin \
    GLIBC_VERSION=2.23-r3 \
    LANG=C.UTF-8

RUN apk upgrade --update && \
    apk add --update libstdc++ curl ca-certificates bash && \
    for pkg in glibc-${GLIBC_VERSION} glibc-bin-${GLIBC_VERSION} glibc-i18n-${GLIBC_VERSION}; do curl -sSL https://github.com/andyshinn/alpine-pkg-glibc/releases/download/${GLIBC_VERSION}/${pkg}.apk -o /tmp/${pkg}.apk; done && \
    apk add --allow-untrusted /tmp/*.apk && \
    rm -v /tmp/*.apk && \
    ( /usr/glibc-compat/bin/localedef --force --inputfile POSIX --charmap UTF-8 C.UTF-8 || true ) && \
    echo "export LANG=C.UTF-8" > /etc/profile.d/locale.sh && \
    /usr/glibc-compat/sbin/ldconfig /lib /usr/glibc-compat/lib && \
    mkdir /opt && \
    curl -jksSLH "Cookie: oraclelicense=accept-securebackup-cookie" -o /tmp/java.tar.gz \
      http://download.oracle.com/otn-pub/java/jdk/${JAVA_VERSION_MAJOR}u${JAVA_VERSION_MINOR}-b${JAVA_VERSION_BUILD}/${JAVA_PACKAGE}-${JAVA_VERSION_MAJOR}u${JAVA_VERSION_MINOR}-linux-x64.tar.gz && \
    gunzip /tmp/java.tar.gz && \
    tar -C /opt -xf /tmp/java.tar && \
    ln -s /opt/jdk1.${JAVA_VERSION_MAJOR}.0_${JAVA_VERSION_MINOR} /opt/jdk && \
    if [ "${JAVA_JCE}" == "unlimited" ]; then echo "Installing Unlimited JCE policy" >&2 && \
      curl -jksSLH "Cookie: oraclelicense=accept-securebackup-cookie" -o /tmp/jce_policy-${JAVA_VERSION_MAJOR}.zip \
        http://download.oracle.com/otn-pub/java/jce/${JAVA_VERSION_MAJOR}/jce_policy-${JAVA_VERSION_MAJOR}.zip && \
      cd /tmp && unzip /tmp/jce_policy-${JAVA_VERSION_MAJOR}.zip && \
      cp -v /tmp/UnlimitedJCEPolicyJDK8/*.jar /opt/jdk/jre/lib/security; \
    fi && \
    sed -i s/#networkaddress.cache.ttl=-1/networkaddress.cache.ttl=30/ $JAVA_HOME/jre/lib/security/java.security && \
    apk del curl glibc-i18n && \
    rm -rf /opt/jdk/*src.zip \
           /opt/jdk/lib/missioncontrol \
           /opt/jdk/lib/visualvm \
           /opt/jdk/lib/*javafx* \
           /opt/jdk/jre/plugin \
           /opt/jdk/jre/bin/javaws \
           /opt/jdk/jre/bin/jjs \
           /opt/jdk/jre/bin/orbd \
           /opt/jdk/jre/bin/pack200 \
           /opt/jdk/jre/bin/policytool \
           /opt/jdk/jre/bin/rmid \
           /opt/jdk/jre/bin/rmiregistry \
           /opt/jdk/jre/bin/servertool \
           /opt/jdk/jre/bin/tnameserv \
           /opt/jdk/jre/bin/unpack200 \
           /opt/jdk/jre/lib/javaws.jar \
           /opt/jdk/jre/lib/deploy* \
           /opt/jdk/jre/lib/desktop \
           /opt/jdk/jre/lib/*javafx* \
           /opt/jdk/jre/lib/*jfx* \
           /opt/jdk/jre/lib/amd64/libdecora_sse.so \
           /opt/jdk/jre/lib/amd64/libprism_*.so \
           /opt/jdk/jre/lib/amd64/libfxplugins.so \
           /opt/jdk/jre/lib/amd64/libglass.so \
           /opt/jdk/jre/lib/amd64/libgstreamer-lite.so \
           /opt/jdk/jre/lib/amd64/libjavafx*.so \
           /opt/jdk/jre/lib/amd64/libjfx*.so \
           /opt/jdk/jre/lib/ext/jfxrt.jar \
           /opt/jdk/jre/lib/ext/nashorn.jar \
           /opt/jdk/jre/lib/oblique-fonts \
           /opt/jdk/jre/lib/plugin.jar \
           /tmp/* /var/cache/apk/*

# Maven
ENV MAVEN_VERSION 3.3.9
ENV MAVEN_HOME /usr/lib/mvn
ENV PATH $MAVEN_HOME/bin:$PATH

RUN wget http://ftp.fau.de/apache/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz && \
    tar -zxvf apache-maven-$MAVEN_VERSION-bin.tar.gz && \
    rm apache-maven-$MAVEN_VERSION-bin.tar.gz && \
    mv apache-maven-$MAVEN_VERSION /usr/lib/mvn

# Workspace
ENV WORKSPACE /home/app/

RUN mkdir -p $WORKSPACE
WORKDIR $WORKSPACE

COPY . $WORKSPACE             # Copy Server Project
RUN mvn clean install -DskipTests

ENTRYPOINT mvn exec:java

docker-compose.yml

version: '2.1'
services:
  server:
    build: ./server/
    ports:
      - "8080:8080"

服务器 Docker 日志:

... maven...
[INFO] --- exec-maven-plugin:1.2.1:java (default-cli) @ restful.littleapp ---
Jan 30, 2017 2:10:18 PM org.glassfish.grizzly.http.server.NetworkListener start
INFO: Started listener bound to [0.0.0.0:8080]
Jan 30, 2017 2:10:18 PM org.glassfish.grizzly.http.server.HttpServer start
INFO: [HttpServer] Started.
Jersey app started with WADL available at http://0.0.0.0:8080/littleapp/application.wadl
Hit enter to stop it...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.507 s
[INFO] Finished at: 2017-01-30T14:10:18+00:00
Jan 30, 2017 2:10:18 PM org.glassfish.grizzly.http.server.NetworkListener shutdownNow
INFO: Stopped listener bound to [0.0.0.0:8080]
[INFO] Final Memory: 37M/90M
[INFO] ------------------------------------------------------------------------

通常，服务器必须监听...

Answer 1

问题可能是您的主类在停止 grizzly 服务器之前正在等待输入。由于 docker 容器不是以交互模式运行，因此它永远不会在命令行上获得输入，并且 System.in 会终止。 mvn exec 进程停止。

您应该找到一种方法来保持 grizzly 服务器运行而不等待输入。

类似

server.start();
Thread.currentThread().join();  // instead of  System.in.read();

编辑:似乎有一个类似的解决方案已经在 s.o. 上描述过。 grizzly-http-server-should-keep-running它还包含通过 shutdownhook 实现的正常关闭。