docker进阶教程之dockerfile优化镜像大小_服务器知识

docker进阶教程之dockerfile优化镜像大小

2022-11-25 15:36芒地狠服务器知识

同样功能的镜像,但是不同的Dockerfile build出来的镜像大小是不一样的,下面这篇文章主要给大家介绍了关于docker进阶教程之dockerfile优化镜像大小的相关资料,需要的朋友可以参考下

一、无优化构建镜像

mkdir /mnt/nginx
 
vim Dockerfile
FROM centos:7
RUN yum install -y gcc pcre pcre-devel devel zlib-devel make
ADD nginx-1.22.0.tar.gz /mnt/nginx
WORKDIR /mnt/nginx/nginx-1.22.0
#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进阶教程之dockerfile优化镜像大小

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-1.22.0.tar.gz /mnt/nginx
WORKDIR /mnt/nginx/nginx-1.22.0
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/nginx-1.22.0
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx""-g","daemon off;"]

docker进阶教程之dockerfile优化镜像大小

三、减少RUN构建

FROM centos:7
ADD nginx-1.22.0.tar.gz /mnt/nginx
WORKDIR /mnt/nginx/nginx-1.22.0
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/nginx-1.22.0
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx","-g","daemon off;"]

docker进阶教程之dockerfile优化镜像大小

docker build -t nginx:v3 . 构建镜像

docker images查看镜像

docker进阶教程之dockerfile优化镜像大小

四、多阶段构建

FROM centos:7 as build 
ADD nginx-1.22.0.tar.gz /mnt/nginx 
WORKDIR /mnt/nginx/nginx-1.22.0
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/nginx-1.22.0

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 . 构建镜像
docker images查看镜像

docker进阶教程之dockerfile优化镜像大小

五、使用更为轻量级的linux发行版本

debian
alpine
apt add
Sandbox
Busybox

#下载debian压缩包
wget http://download.openvz.org/template/precreated/debian-7.0-x86-minimal.tar.gz
docker import debian-7.0-x86-minimal.tar.gz -- debian:v1 生成镜像
docker images 查看