本文主要是介绍Dockerfile之Nginx镜像优化，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

目录

• 一.编写Nginx镜像优化前
• 二.不需要输出的指令丢入/dev/null
• • 前提：需要确定命令执行的是正确的
• 三.减少RUN
• • 因为每一层RUN都会生成一层新的镜像层，从而占用了不必要的空间。
• 四.多阶段构建
• • 注：使用FROM命令生成多个镜像，将指定的镜像做为其他镜像的基础镜像环境来构建

一.编写Nginx镜像优化前

FROM centos:7
RUN yum install -y gcc pcre pcre-devel devel zlib-devel make
ADD nginx-1.15.9.tar.gz /mnt
WORKDIR /mnt/nginx-1.15.9
RUN ./configure --prefix=/usr/local/nginx
RUN make
RUN make install
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]CMD ["/usr/local/nginx/sbin/nginx","-g","daemon off;"]

二.不需要输出的指令丢入/dev/null

FROM centos:7
RUN yum install -y gcc pcre pcre-devel devel zlib-devel make &> /dev/null && yum clean all
ADD nginx-1.15.9.tar.gz /mnt
WORKDIR /mnt/nginx-1.15.9
RUN ./configure --prefix=/usr/local/nginx &> /dev/null
RUN make &> /dev/null
RUN make install &> /dev/null
RUN rm -rf /mnt/nginx-1.15.9
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx""-g","daemon off;"]

前提：需要确定命令执行的是正确的

三.减少RUN

因为每一层RUN都会生成一层新的镜像层，从而占用了不必要的空间。

FROM centos:7
ADD nginx-1.15.9.tar.gz /mnt
WORKDIR /mnt/nginx-1.15.9
RUN yum install -y gcc pcre pcre-devel devel zlib-devel make &> /dev/null && \
 yum clean all && \
 ./configure --prefix=/usr/local/nginx &> /dev/null && \
 make &> /dev/null && make install &> /dev/null &&\
 rm -rf /mnt/nginx-1.15.9
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx","-g","daemon off;"]

四.多阶段构建

注：使用FROM命令生成多个镜像，将指定的镜像做为其他镜像的基础镜像环境来构建

FROM centos:7 as build
ADD nginx-1.15.9.tar.gz /mnt 
WORKDIR /mnt/nginx-1.15.9
RUN yum install -y gcc pcre pcre-devel devel zlib-devel make &> /dev/null && \
yum clean all &&\
sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc && \
./configure --prefix=/usr/local/nginx &> /dev/null && \
make &>/dev/null && \
make install &>/dev/null && \
rm -rf /mnt/nginx-1.15.9 
FROM centos:7  
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
COPY --from=build /usr/local/nginx /usr/local/nginx
CMD ["/usr/local/nginx/sbin/nginx","-g","daemon off;"]

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