Fix:

master镜像nginx启动失败

Break change：
 Dockerfile.alpine -> Dockerfile.master.alpine

Feture:
  增加Dockerfile.worker.alpine 文件

Dockerfile.master.apline

@@ -27,10 +27,6 @@ ADD . /app
 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
 
 # install packages
-#RUN apt-get update \
-#	&& apt-get install -y curl git net-tools iputils-ping ntp ntpdate python3 python3-pip \
-#	&& ln -s /usr/bin/pip3 /usr/local/bin/pip \
-#	&& ln -s /usr/bin/python3 /usr/local/bin/python
 RUN apk update && apk add --no-cache --virtual .build-deps \
         gcc \
         linux-headers \
@@ -55,6 +51,8 @@ RUN apk del .build-deps
 COPY --from=frontend-build /app/dist /app/dist
 COPY --from=frontend-build /app/conf/crawlab.conf /etc/nginx/conf.d
 
+VOLUME [ “/sys/fs/cgroup” ]
+
 RUN sed -i 's/#rc_sys=""/rc_sys="lxc"/g' /etc/rc.conf && \
     echo 'rc_provide="loopback net"' >> /etc/rc.conf && \
     sed -i 's/^#\(rc_logger="YES"\)$/\1/' /etc/rc.conf && \

Dockerfile.worker.apline

@@ -0,0 +1,43 @@
+FROM golang:1.12-alpine AS backend-build
+
+WORKDIR /go/src/app
+COPY ./backend .
+
+ENV GO111MODULE on
+ENV GOPROXY https://mirrors.aliyun.com/goproxy/
+
+RUN go install -v ./...
+
+# images
+FROM python:alpine
+
+ADD . /app
+
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+
+RUN apk update && apk add --no-cache --virtual .build-deps \
+        gcc \
+        linux-headers \
+        musl-dev \
+        libffi-dev \
+        libxml2-dev \
+        libxslt-dev \
+        openssl-dev
+
+# install backend
+RUN pip install scrapy pymongo bs4 requests -i https://pypi.tuna.tsinghua.edu.cn/simple
+
+# copy backend files
+COPY --from=backend-build /go/src/app/conf ./conf
+COPY --from=backend-build /go/bin/crawlab /usr/local/bin
+
+RUN apk del .build-deps
+
+# working directory
+WORKDIR /app/backend
+
+# backend port
+EXPOSE 8000
+
+# start backend
+CMD crawlab