Docker——Image的原理（四）（1）

docker build -t my-mysql-image .

#
# NOTE: THIS DOCKERFILE IS GENERATED VIA "apply-templates.sh"
#
# PLEASE DO NOT EDIT IT DIRECTLY.
#
基础镜像信息是FROM
FROM debian:buster-slim
# add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 镜像操作指令 RUN 构建镜像时执行的命令
RUN groupadd -r mysql && useradd -r -g mysql mysql
 镜像操作指令 RUN 构建镜像时执行的命令
RUN apt-get update && apt-get install -y --no-install-recommends gnupg dirmngr && rm -rf /var/lib/apt/lists/*
# add gosu for easy step-down from root
# https://github.com/tianon/gosu/releases
设置环境变量 ENV
ENV GOSU_VERSION 1.12
RUN set -eux; \
  savedAptMark="$(apt-mark showmanual)"; \
  apt-get update; \
  apt-get install -y --no-install-recommends ca-certificates wget; \
  rm -rf /var/lib/apt/lists/*; \
  dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
  wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
  wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
  export GNUPGHOME="$(mktemp -d)"; \
  gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
  gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
  gpgconf --kill all; \
  rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
  apt-mark auto '.*' > /dev/null; \
  [ -z "$savedAptMark" ] || apt-mark manual $savedAptMark > /dev/null; \
  apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
  chmod +x /usr/local/bin/gosu; \
  gosu --version; \
  gosu nobody true
RUN mkdir /docker-entrypoint-initdb.d
RUN apt-get update && apt-get install -y --no-install-recommends \
# for MYSQL_RANDOM_ROOT_PASSWORD
    pwgen \
# for mysql_ssl_rsa_setup
    openssl \
# FATAL ERROR: please install the following Perl modules before executing /usr/local/mysql/scripts/mysql_install_db:
# File::Basename
# File::Copy
# Sys::Hostname
# Data::Dumper
    perl \
# install "xz-utils" for .sql.xz docker-entrypoint-initdb.d files
    xz-utils \
  && rm -rf /var/lib/apt/lists/*
RUN set -ex; \
# gpg: key 5072E1F5: public key "MySQL Release Engineering <mysql-build@oss.oracle.com>" imported
  key='A4A9406876FCBD3C456770C88C718D3B5072E1F5'; \
  export GNUPGHOME="$(mktemp -d)"; \
  gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "$key"; \
  gpg --batch --export "$key" > /etc/apt/trusted.gpg.d/mysql.gpg; \
  gpgconf --kill all; \
  rm -rf "$GNUPGHOME"; \
  apt-key list > /dev/null
ENV MYSQL_MAJOR 5.7
ENV MYSQL_VERSION 5.7.34-1debian10
RUN echo 'deb http://repo.mysql.com/apt/debian/ buster mysql-5.7' > /etc/apt/sources.list.d/mysql.list
# the "/var/lib/mysql" stuff here is because the mysql-server postinst doesn't have an explicit way to disable the mysql_install_db codepath besides having a database already "configured" (ie, stuff in /var/lib/mysql/mysql)
# also, we set debconf keys to make APT a little quieter
RUN { \
    echo mysql-community-server mysql-community-server/data-dir select ''; \
    echo mysql-community-server mysql-community-server/root-pass password ''; \
    echo mysql-community-server mysql-community-server/re-root-pass password ''; \
    echo mysql-community-server mysql-community-server/remove-test-db select false; \
  } | debconf-set-selections \
  && apt-get update \
  && apt-get install -y \
    mysql-server="${MYSQL_VERSION}" \
# comment out a few problematic configuration values
  && find /etc/mysql/ -name '*.cnf' -print0 \
    | xargs -0 grep -lZE '^(bind-address|log)' \
    | xargs -rt -0 sed -Ei 's/^(bind-address|log)/#&/' \
# don't reverse lookup hostnames, they are usually another container
  && echo '[mysqld]\nskip-host-cache\nskip-name-resolve' > /etc/mysql/conf.d/docker.cnf \
  && rm -rf /var/lib/apt/lists/* \
  && rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/run/mysqld \
  && chown -R mysql:mysql /var/lib/mysql /var/run/mysqld \
# ensure that /var/run/mysqld (used for socket and lock files) is writable regardless of the UID our mysqld instance ends up having at runtime
  && chmod 1777 /var/run/mysqld /var/lib/mysql
/*注释 VOLUME：添加卷，用于指定持久化目录 */
VOLUME /var/lib/mysql
/* ADD：将本地文件添加到容器中，tar类型文件会自动解压(网络压缩资源不会被解压)，可以访问网络资源，类似wget */
/* COPY：功能类似ADD，但是是不会自动解压文件，也不能访问网络资源,即将物理资源拷贝到容器中 */
COPY docker-entrypoint.sh /usr/local/bin/
RUN ln -s usr/local/bin/docker-entrypoint.sh /entrypoint.sh # backwards compat
/*注释：ENTRYPOINT：配置容器，使其可执行化。配合CMD可省去"application"，只使用参数。*/
ENTRYPOINT ["docker-entrypoint.sh"]
/*注释，EXPOSE：指定暴露镜像的端口供主机做映射*/
EXPOSE 3306 33060
/* CMD：构建容器后调用，也就是在容器启动时才进行调用，存在多个CMD时只有最后一个生效，也支持exec语法。 */
CMD ["mysqld"]

@RestController
public class DockerController {
@GetMapping("/dockerfile")
@ResponseBody
String dockerfile() {
return "hello docker" ;
 }
}

FROM openjdk:8
MAINTAINER itcrazy2016
LABEL name="HelloDocker-Ysy" version="1.0" author="yueshaoyang"
COPY dockerfile-demo-0.0.1-SNAPSHOT.jar dockerfile-image.jar
CMD ["java","-jar","dockerfile-image.jar"]