带Docker Alpine Linux的Apache

Question

我想用alpine和Apache创建一个docker图像。我使用tini作为“init”系统。直到我卸下并重新连接到容器上。连接到容器后，apache退出，容器停止。我不知道问题出在哪里。有没有人在docker、alpine和Apache上遇到过类似的问题？

FROM alpine
ENV TINI_VERSION v0.16.1
ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-static /sbin/tini
RUN chmod +x /sbin/tini
RUN apk add --no-cache apache2 \
   && mkdir -p /run/apache2 \
   && ln -sf /dev/stdout /var/log/apache2/access.log \
   && ln -sf /dev/stderr /var/log/apache2/error.log
EXPOSE 80
ENTRYPOINT ["/sbin/tini", "-vvv", "-g", "--"]
CMD ["/usr/sbin/httpd", "-f", "/etc/apache2/httpd.conf", "-DFOREGROUND"]

~/Desktop/docker_test@laptop-sebi
$ docker run -itd test1
a793bad5d4350f58893909f1552c9f2978d8e2952960ac667f8dcb2bf7a3516e

~/Desktop/docker_test@laptop-sebi
$ docker container ls
CONTAINER ID        IMAGE               COMMAND                  CREATED             
STATUS              PORTS               NAMES
a793bad5d435        test1               "/sbin/tini -vvv -..."   12 seconds 
ago      Up 11 seconds       80/tcp              sharp_neumann

~/Desktop/docker_test@laptop-sebi
$ docker attach a7
[DEBUG tini (1)] Received SIGCHLD
[DEBUG tini (1)] Reaped child with pid: '5'
[INFO  tini (1)] Main child exited normally (with status '0')
[TRACE tini (1)] No child to wait
[TRACE tini (1)] Exiting: child has exited

更新：问题似乎出在apache2，它在docker附加到容器的同时接收SIGWINCH（窗口大小更改）：

[Sun Oct 15 12:13:24.592575 2017] [mpm_prefork:notice] [pid 5] AH00170: caught SIGWINCH, shutting down gracefully
[DEBUG tini (1)] Received SIGCHLD
[DEBUG tini (1)] Reaped child with pid: '5'
[INFO  tini (1)] Main child exited normally (with status '0')
[TRACE tini (1)] No child to wait
[TRACE tini (1)] Exiting: child has exited

Apache错误地将该信号与apachectl实用程序结合起来，以优雅地关闭服务器。有没有可能阻止这个信号，这样它就不会传给阿帕奇了？

Answer 1

Apache确实使用SIGWINCH触发一个优雅的关机：

docker kill ----signal=SIGWINCH apache

Docker-Library/httpd第9期提到

即使只是删除“-t”，也应该在窗口调整大小时删除sigwinch的发送。

如果我不连接tty，信号就不会发送

因此，如果可能，请避免-t，如果需要TTY，则添加Docker exec-t会话。