错误：无法启动 nginx，因为网络无法在 alpine docker 映像上启动

Question

我们正在尝试在基于 java 的 alpine 映像 (anapsix/alpine-java:7_jdk) 上安装和运行 nginx，但是当我们启动它时遇到以下错误

rc-service nginx start
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/blkio/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/cpu/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/cpu,cpuacct/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/cpuacct/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/cpuset/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/devices/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/freezer/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/hugetlb/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/memory/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/net_cls/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/net_cls,net_prio/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/net_prio/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/perf_event/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/pids/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 250: can't create /sys/fs/cgroup/systemd/tasks: Read-only file system
 * Starting networking ...
awk: /etc/network/interfaces: No such file or directory
 * ERROR: networking failed to start
 * ERROR: cannot start nginx as networking would not start

我们已经尝试了很多文章，但没有提到如何在这个基于 alpine 的图像上修复 nginx 的网络问题。即使我们创建了/etc/network/interfaces 文件，我们也不知道其中的正确值应该是什么。下面是我们正在运行的 Dockerfile

# Add Nginx
RUN apk --update add nginx openrc
RUN mkdir -p /run/nginx
RUN touch /run/nginx/nginx.pid
# RUN adduser -D -g 'nginx' nginx
# RUN mkdir /home/nginx
RUN chown -R nginx:nginx /var/lib/nginx
# RUN chown -R nginx:nginx /home/nginx
COPY birt.conf /etc/nginx/conf.d/birt.conf
# COPY index.html /nginx
RUN openrc
RUN touch /run/openrc/softlevel
RUN rc-update add nginx default

请帮助我们实现这一目标。

Answer 1

在看到这个惊人的answer 之后，我设法让 Nginx 在anapsix/alpine-java:7_jdk 图像中工作。

这是一个有效的 Dockerfile：

FROM anapsix/alpine-java:7_jdk

COPY script.bash .

RUN apk --update add nginx openrc
RUN openrc
RUN touch /run/openrc/softlevel

CMD bash ./script.bash

这是CMD中使用的script.bash：

#!/bin/bash

# Tell openrc loopback and net are already there, since docker handles the networking
echo 'rc_provide="loopback net"' >> /etc/rc.conf

# get inside the container bash
bash

使用docker build . -t nginx_alpine_java 构建映像后，运行以下命令：

docker run -it -p 80:80 nginx_alpine_java

现在我们在容器 bash 中

bash-4.3# rc-service nginx status
 * status: stopped

bash-4.3# rc-service nginx start
 * /run/nginx: creating directory
 * /run/nginx: correcting owner                                [ ok ]
 * Starting nginx ...                                          [ ok ]

我希望它对你有用。