升级dockerfile 压缩包大小，去除Nginx，nodejs等。 v7.8.4

Docker/Dockerfile

@@ -1,11 +1,12 @@
 # Dockerfile by xianhu: build a docker image
-# docker build --rm -t xianhu/centos:v7.8.3 .
+# docker build --rm -t xianhu/centos:v7.8.4 .
 
 # 普通进入
-# docker run -it --name test [-p -v] xianhu/centos:v7.8.3 (ctrl+p/q即可退出，attach重新进入)
+# docker run -it --name test [-p -v] xianhu/centos:v7.8.4 /bin/bash
+# docker attach test (ctrl+p/q即可退出，attach重新进入)
 
 # 特权进入
-# docker run -it --name test -d [-p -v] --privileged=true xianhu/centos:v7.8.3 /usr/sbin/init
+# docker run -it --name test [-p -v] -d --privileged=true xianhu/centos:v7.8.4
 # docker exec -it test /bin/bash (不能使用attach进入，退出直接exit即可)
 
 # 基础镜像
@@ -15,59 +16,44 @@ FROM centos:7.8.2003
 ENV LANG "en_US.UTF-8"
 ENV LC_ALL "en_US.UTF-8"
 
-# change system local time
-RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
-
-# fix: warning: rpmts_HdrFromFdno
-RUN rpm --import /etc/pki/rpm-gpg/RPM*
+# change system local time, fix: warning: rpmts_HdrFromFdno
+RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
+    rpm --import /etc/pki/rpm-gpg/RPM*
 
 # update yum and install something
-RUN yum update -y
-RUN yum install -y xz
-RUN yum install -y vim
-RUN yum install -y git
-RUN yum install -y gcc
-RUN yum install -y make
-RUN yum install -y wget
-RUN yum install -y which
-RUN yum install -y screen
-RUN yum install -y gcc-c++
-RUN yum install -y crontabs
-RUN yum install -y zlib-devel
-RUN yum install -y sqlite-devel
-RUN yum install -y openssl-devel
-RUN yum install -y bzip2-devel
-RUN yum install -y libffi-devel
-RUN yum install -y libSM.x86_64
-RUN yum install -y libXext.x86_64
-RUN yum install -y libXrender.x86_64
-
-# install node
-RUN curl -sL https://rpm.nodesource.com/setup_14.x | bash -
-RUN yum install -y nodejs
-
-# install epel
-RUN yum install -y epel-release
+RUN yum update -y && \
+    yum install -y xz \
+    vim \
+    git \
+    gcc \
+    make \
+    wget \
+    which \
+    screen \
+    gcc-c++ \
+    crontabs \
+    zlib-devel \
+    sqlite-devel \
+    openssl-devel \
+    bzip2-devel \
+    libffi-devel \
+    libSM.x86_64 \
+    libXext.x86_64 \
+    libXrender.x86_64
 
 # install python
-COPY ./Python-3.8.12.tgz /root
-WORKDIR /root
+COPY ./Python-3.8.12.tgz /root/
+WORKDIR /root/
 RUN tar xvzf Python-3.8.12.tgz
-WORKDIR /root/Python-3.8.12
-RUN ./configure
-RUN make && make install
-
-# clean root
+WORKDIR /root/Python-3.8.12/
+RUN ./configure && make && make install
 WORKDIR /root/
-RUN rm -rf /root/*
 
-# install nginx
-RUN yum install -y nginx
+# clean root and yum cache
+RUN rm -rf /root/* && yum clean all
 
-# clean yum cache
-RUN yum clean all
 # RUN python3 -m pip install --upgrade pip -i http://pypi.douban.com/simple/
 # RUN python3 -m pip install -r requirements.txt -i http://mirrors.aliyun.com/pypi/simple/
 
 # entry
-CMD /bin/bash
+CMD /usr/sbin/init