tomcat7无法在Ubuntu Docker容器内启动

Question

最初的情况

在Ubuntu(14.04/14.10)中,运行以下命令:

apt-get update && apt-get install tomcat7
service tomcat7 start

一方面我按照预期在VirtualBox VM和tomcat7 startet中尝试了这个:

vagrant init hashicorp/precise32
vagrant up

另一方面,我在Docker容器中尝试了这个,如下所示:

sudo docker run -it --name tomcattest ubuntu bash

问题

那里的服务tomcat7开始命令输出[失败.然而tomcat正在运行,但是/var/log/tomcat7/catalina.out表示如下:

Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.ClassLoaderFactory validateFile
WARNING: Problem with directory [/usr/share/tomcat7/common/classes], exists: [false], isDirectory: [false], canRead: [false]
Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.ClassLoaderFactory validateFile
WARNING: Problem with directory [/usr/share/tomcat7/common], exists: [false], isDirectory: [false], canRead: [false]
Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.ClassLoaderFactory validateFile
WARNING: Problem with directory [/usr/share/tomcat7/server/classes], exists: [false], isDirectory: [false], canRead: [false]
Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.ClassLoaderFactory validateFile
WARNING: Problem with directory [/usr/share/tomcat7/server], exists: [false], isDirectory: [false], canRead: [false]
Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.ClassLoaderFactory validateFile
WARNING: Problem with directory [/usr/share/tomcat7/shared/classes], exists: [false], isDirectory: [false], canRead: [false]
Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.ClassLoaderFactory validateFile
WARNING: Problem with directory [/usr/share/tomcat7/shared], exists: [false], isDirectory: [false], canRead: [false]
Apr 16, 2015 5:52:40 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Apr 16, 2015 5:52:40 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 514 ms
Apr 16, 2015 5:52:41 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Apr 16, 2015 5:52:41 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.52 (Ubuntu)
Apr 16, 2015 5:52:41 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /var/lib/tomcat7/webapps/ROOT
Apr 16, 2015 5:52:42 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Apr 16, 2015 5:52:42 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1150 ms

搜索解释

任何人都可以解释不同的行为并告诉我是否有可能通过apt-get在没有警告的情况下通过apt-get安装tomcat7？

Answer 1

解决方案

tomcat启动脚本需要一些特殊权限.具体它需要检查所有正在运行的进程,以验证自己是否正在运行.您可以为Docker容器提供以下权限,以使tomcat启动脚本成功退出:

sudo docker run --cap-add SYS_PTRACE -it ubuntu bash

重要的选项是--cap-add SYS_PTRACE,所有其他选项可能会有所不同.在docker github上有(至少一个)讨论此问题的问题:

https://github.com/docker/docker/issues/6800

后续问题

尽管如此,我发现无法为图像的docker构建设置此权限.我的最终目标是运行一个在其中执行Ansible playbook的docker build.由于服务启动,构建失败了,我不会从剧本中删除.我会进一步调查,但欢迎可能的解决方案.