无优化构建镜像
mkdir /nginx
vim Dockerfile
FROM centos:7
RUN yum install -y gcc pcre pcre-devel devel zlib-devel make
ADD nginx-1.15.9.tar.gz /opt
WORKDIR /opt/nginx-1.15.9
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;"]
未优化前
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 /opt
WORKDIR /opt/nginx-1.15.9
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 /opt/nginx-1.15.9.tar.gz
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx""-g","daemon off;"]
优化二：减少RUN构建
FROM centos:7
ADD nginx-1.15.9.tar.gz /opt
WORKDIR /opt/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 /opt/nginx-1.15.9
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx","-g","daemon off;"]
优化三：多阶段构建
FROM centos:7 as build
ADD nginx-1.15.9.tar.gz /opt/nginx
WORKDIR /opt/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 /opt/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;"]
优化四：选择更轻量级的模板
wget http://download.openvz.org/template/precreated/debian-7.0-x86-minimal.tar.gz
#下载debian压缩包
docker import debian-7.0-x86-minimal.tar.gz -- debian:v1
