Dockerfile

创建文件名为 Dockerfile

FROM nginx:latest
RUN echo 'this is from dockerfile' > /usr/share/nginx/html/index.html

RUN ["/bin/echo","helloworld",">","/usr/share/nginx/html/index.html"]

在Dockerfile文件所在目录执行如下命令
docker build -t nginx:v3 .

[root@localhost test]# docker build -t nginx:v3 .
Sending build context to Docker daemon 8.704 kB
Step 1/2 : FROM nginx:latest
---> 2073e0bcb60e
Step 2/2 : RUN /bin/echo helloworld > /usr/share/nginx/html/index.html
---> Running in 98e843a54c5e

helloworld > /usr/share/nginx/html/index.html
---> c91bfd692991
Removing intermediate container 98e843a54c5e
Successfully built c91bfd692991

RUN 命令用来执行命令行，支持两种格式，
一种是 shell 格式: RUN <命令>
一种是 exec 格式: RUN ["可执行文件", "参数1", "参数2"]

注意，在写RUN 命令时，一行命令对应镜像的一层，所以不要这样写

RUN apt-get update
RUN apt-get install -y gcc libc6-dev make
RUN wget -O redis.tar.gz "http://download.redis.io/releases/redis-3.2.5.tar.gz"
RUN mkdir -p /usr/src/redis
RUN tar -xzf redis.tar.gz -C /usr/src/redis --strip-components=1
RUN make -C /usr/src/redis
RUN make -C /usr/src/redis install

尽量这样写
RUN apt-get update
&& apt-get install -y gcc libc6-dev make
&& wget -O redis.tar.gz "http://download.redis.io/releases/redis-3.2.5.tar.gz"
&& mkdir -p /usr/src/redis
&& tar -xzf redis.tar.gz -C /usr/src/redis --strip-components=1
&& make -C /usr/src/redis
&& make -C /usr/src/redis install