tomcat - Docker Tomcat运行后退出0

Question

我从 Dockerfile 制作了一个图像:

FROM tomcat:8.0
COPY target/javahello.war /usr/local/tomcat/webapps/
EXPOSE 8080
CMD /usr/local/tomcat/bin/startup.sh

但是启动后 - 它处于“退出”状态:

$ sudo docker run -ti 957a86defe4f
Using CATALINA_BASE:   /usr/local/tomcat
Using CATALINA_HOME:   /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME:        /usr/lib/jvm/java-7-openjdk-amd64/jre
Using CLASSPATH:       /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
Tomcat started.

还有:

$ sudo docker ps -a | head
CONTAINER ID        IMAGE                                                                     COMMAND                CREATED             STATUS                        PORTS                     NAMES
dc2309620baf        957a86defe4f:latest                                                       "/bin/sh -c /usr/loc   25 seconds ago      Exited (0) 24 seconds ago                               insane_elion     

日志没有显示任何内容:

$ sudo docker logs dc2309620baf
Using CATALINA_BASE:   /usr/local/tomcat
Using CATALINA_HOME:   /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME:        /usr/lib/jvm/java-7-openjdk-amd64/jre
Using CLASSPATH:       /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
Tomcat started.

如果我直接从容器运行 startup.sh - Tomcat 按预期工作:

$ sudo docker run -ti 957a86defe4f bash
root@b00b541e6ccb:/usr/local/tomcat# ./bin/startup.sh 
Using CATALINA_BASE:   /usr/local/tomcat
Using CATALINA_HOME:   /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME:        /usr/lib/jvm/java-7-openjdk-amd64/jre
Using CLASSPATH:       /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
Tomcat started.
# ps -axu | grep tomcat
root        15 44.7  1.1 6258648 193484 ?      Sl   14:54   0:04 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Djava.endorsed.dirs=/usr/local/tomcat/endorsed -classpath /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start

我的CMD有问题吗？

Answer 1

使用 startup.sh 的 tomcat 将在后台启动 tomcat(作为服务)，并且 docker 将以 code 0 退出，这是正常且预期的行为。

在这种情况下，您需要使用 catalina.sh run 将 tomcat 作为前台进程启动。

 FROM tomcat:8.0
 COPY target/javahello.war /usr/local/tomcat/webapps/
 EXPOSE 8080
 CMD /usr/local/tomcat/bin/catalina.sh run

当您在容器内运行 startup.sh 时，它正在工作，因为您处于“bash”(您的前台进程)中。