浅谈dockerfile优化

目录

未优化之前大小

优化一：不需要输出的指令丢入/dev/null （需要确定命令执行的是正确的）

优化二：减少RUN构建

优化3:多阶段构建（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）

优化4 使用更为轻量级的linux 发行版本

#未优化之前 

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
#关闭debug日志
RUN sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc 
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;"]

docker build -f Dockerfile -t nginx:v1 .
 

未优化前大小

优化一：不需要输出的指令丢入/dev/null （需要确定命令执行的是正确的）

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
#关闭debug日志
RUN sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc
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;"]

docker build -f Dockerfile -t nginx:v2 .
 

优化一次的大小 

优化二：减少RUN构建

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 && 
 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 
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx","-g","daemon off;"]

docker build -f Dockerfile -t nginx:v3 .

优化3:多阶段构建（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;"]

 docker  build -t nginx:v4 .

 

优化4 使用更为轻量级的linux 发行版本

debian

alpine

sandbox

busybox