Dockfile

步骤

  1. 手写符合规范的dockerfile文件   2. docker build 创建一个自定义的镜像   3. docker run 执行

Dockerfile

dockerfile规范

保留字大写，后跟参数
#注释
每条指令都会形成一个新的镜像

例如：dockerhub上的centos、redis的例子

FROM scratch MAINTAINER https://github.com/CentOS/sig-cloud-instance-images ADD centos-6-docker.tar.xz /  LABEL org.label-schema.schema-version="1.0"      org.label-schema.name="CentOS Base Image"      org.label-schema.vendor="CentOS"      org.label-schema.license="GPLv2"      org.label-schema.build-date="20181006"  CMD ["/bin/bash"]

FROM debian:buster-slim  # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added RUN groupadd -r -g 999 redis && useradd -r -g redis -u 999 redis  # grab gosu for easy step-down from root # https://github.com/tianon/gosu/releases ENV GOSU_VERSION 1.12 RUN set -eux;  	savedAptMark="$(apt-mark showmanual)";  	apt-get update;  	apt-get install -y --no-install-recommends ca-certificates dirmngr gnupg wget;  	rm -rf /var/lib/apt/lists/*;  	...  ENV REDIS_VERSION 6.0.9 ENV REDIS_DOWNLOAD_URL http://download.redis.io/releases/redis-6.0.9.tar.gz ENV REDIS_DOWNLOAD_SHA dc2bdcf81c620e9f09cfd12e85d3bc631c897b2db7a55218fd8a65eaa37f86dd  RUN set -eux;  	 	savedAptMark="$(apt-mark showmanual)";  	apt-get update;  	apt-get install -y --no-install-recommends  	;  	rm -rf /var/lib/apt/lists/*;  	 	wget -O redis.tar.gz "$REDIS_DOWNLOAD_URL";  	echo "$REDIS_DOWNLOAD_SHA *redis.tar.gz" | sha256sum -c -;  	mkdir -p /usr/src/redis;  	tar -xzf redis.tar.gz -C /usr/src/redis --strip-components=1;  	rm redis.tar.gz;  	            .....       	redis-cli --version;  	redis-server --version  RUN mkdir /data && chown redis:redis /data VOLUME /data WORKDIR /data  COPY docker-entrypoint.sh /usr/local/bin/ ENTRYPOINT ["docker-entrypoint.sh"]  EXPOSE 6379 CMD ["redis-server"]