Question

我是Docker的新手。我的Dockerfile（来自教程）是：

FROM ubuntu

ENV DEBIAN_FRONTEND noninteractive

RUN apt-get update \
&& apt-get install -y --no-install-recommends apache2 \
                        libapache2-mod-jk
VOLUME ["/var/log/apache2"]
RUN echo 'ServerName localhost' >> /etc/apache2/apache2.conf
EXPOSE 80 443

ENTRYPOINT ["apache2ctl", "-D", "FOREGROUND"]

我给了docker build -t mg:httpd apache\。没有错误。

λ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED                SIZE
mg                  httpd               262d7a4f85fc        About an hour ago      248MB

docker run -it mg:httpd

没有错误，但光标立即返回到命令提示符。在浏览器中获取Unable to connect http://localhost/。

λ docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                         PORTS                
600231bbd461        mg:httpd            "apache2ctl -D FOR..."   2 minutes ago       Exited (0) 2 minutes ago

泊坞窗日志为空

λ docker events
2017-09-08T15:26:10.726720800+05:30 container create 5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157 (image=mg:httpd, name=zealous_ritchie)
2017-09-08T15:26:10.740310700+05:30 container attach 5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157 (image=mg:httpd, name=zealous_ritchie)
2017-09-08T15:26:11.035777100+05:30 network connect 2b8829b336575a2aa2210f55105d793e8f1b196d51845d38d3dc8ff322af6143 (container=5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157, name=bridge, type=bridge)
2017-09-08T15:26:11.090873500+05:30 volume mount e8421cbd867fca04f0dd3ee6da815c59cad5fc32c5a427710d144213b43caa26 (container=5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157, destination=/var/log/apache2, driver=local, propagation=, read/write=true)
2017-09-08T15:26:11.548736900+05:30 container start 5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157 (image=mg:httpd, name=zealous_ritchie)
2017-09-08T15:26:11.573272300+05:30 container resize 5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157 (height=41, image=mg:httpd, name=zealous_ritchie, width=168)
2017-09-08T15:26:12.733164900+05:30 container die 5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157 (exitCode=0, image=mg:httpd, name=zealous_ritchie)
2017-09-08T15:26:13.227455500+05:30 network disconnect 2b8829b336575a2aa2210f55105d793e8f1b196d51845d38d3dc8ff322af6143 (container=5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157, name=bridge, type=bridge)
2017-09-08T15:26:13.306885700+05:30 volume unmount e8421cbd867fca04f0dd3ee6da815c59cad5fc32c5a427710d144213b43caa26 (container=5325b79abe1988312952629165551c169a8bdc3fbe6e473cf0177859db7c0157, driver=local)

可能是什么原因？当容器未启动时，如何查看apache log \ conf文件？

Answer 1

因此，您的Web服务器不是作为前台进程的startet，这就是容器立即停止的原因。

我认为你应该改变

a = np.random.randint(10, size=(100,100,100))  #axes x,y,z
N = 5

maxima = np.zeros((100,100,N)) #container for mean of N max values along axis z

for x in range(100):                            #loop through x axis
    for y in range(100):                        #loop through y axis
         max_idx = a[x, y, :].argsort()[-N:]    #indices of N max values along z axis
         maxima[x, y, :] = a[x, y , max_idx]    #extract values

result = np.mean(maxima, axis = 2)              #take the mean

到

ENTRYPOINT ["apache2ctl", "-D", "FOREGROUND"]

因为您希望在装载容器时运行该命令。

CMD ["apache2ctl", "-D", "FOREGROUND"]指令声明用于执行ENTRYPOINT的可执行文件。

CMD

我能找到的Ubuntu图片default command是ENTRYPOINT ["apache2ctl", "-D", "FOREGROUND"] results in: $ apache2ctl -D FOREGROUND <command either from the run command line or the CMD directive>。所以当你使用：

运行容器时

/bin/bash

执行的结果命令为：

docker run -it mg:httpd

显然没有多大意义。我建议过that帖子，它很好地解释了细节。

在上述变化之后，它将如下所示：

$  apache2ctl -D FOREGROUND /bin/bash

Answer 2

当您以交互方式运行容器时会发生这种情况，因为这样可以将SIGWINCH信号从主机转发到容器。 Apache使用SIGWINCH来表示正常关闭。我提供了完整的答案here。

为什么httpd容器立即退出而Docker中没有任何错误

2 个答案: