Docker File

What is Docker File?

Dockerfile 是一个用来构建镜像的文本文件，文本内容包含了一条条构建镜像所需的指令和说明。

How to use Docker File!

Docker build

Usage:  docker build [OPTIONS] PATH | URL | -
Build an image from a Dockerfile
Options:
      --add-host list           Add a custom host-to-IP mapping (host:ip)
      --build-arg list          Set build-time variables
      --cache-from strings      Images to consider as cache sources
      --cgroup-parent string    Optional parent cgroup for the container
      --compress                Compress the build context using gzip
      --cpu-period int          Limit the CPU CFS (Completely Fair
                                Scheduler) period
      --cpu-quota int           Limit the CPU CFS (Completely Fair
                                Scheduler) quota
  -c, --cpu-shares int          CPU shares (relative weight)
      --cpuset-cpus string      CPUs in which to allow execution (0-3, 0,1)
      --cpuset-mems string      MEMs in which to allow execution (0-3, 0,1)
      --disable-content-trust   Skip image verification (default true)
  -f, --file string             Name of the Dockerfile (Default is
                                'PATH/Dockerfile')
      --force-rm                Always remove intermediate containers
      --iidfile string          Write the image ID to the file
      --isolation string        Container isolation technology
      --label list              Set metadata for an image
  -m, --memory bytes            Memory limit
      --memory-swap bytes       Swap limit equal to memory plus swap:
                                '-1' to enable unlimited swap
      --network string          Set the networking mode for the RUN
                                instructions during build (default "default")
      --no-cache                Do not use cache when building the image
  -o, --output stringArray      Output destination (format:
                                type=local,dest=path)
      --platform string         Set platform if server is multi-platform
                                capable
      --progress string         Set type of progress output (auto, plain,
                                tty). Use plain to show container output
                                (default "auto")
      --pull                    Always attempt to pull a newer version of
                                the image
  -q, --quiet                   Suppress the build output and print image
                                ID on success
      --rm                      Remove intermediate containers after a
                                successful build (default true)
      --secret stringArray      Secret file to expose to the build (only
                                if BuildKit enabled):
                                id=mysecret,src=/local/secret
      --security-opt strings    Security options
      --shm-size bytes          Size of /dev/shm
      --squash                  Squash newly built layers into a single
                                new layer
      --ssh stringArray         SSH agent socket or keys to expose to the
                                build (only if BuildKit enabled) (format:
                                default|<id>[=<socket>|<key>[,<key>]])
  -t, --tag list                Name and optionally a tag in the
                                'name:tag' format
      --target string           Set the target build stage to build.
      --ulimit ulimit           Ulimit options (default [])

Docker 指令

Docker history

查看镜像构建历史

Usage:  docker history [OPTIONS] IMAGE
Show the history of an image
Options:
      --format string   Pretty-print images using a Go template
  -H, --human           Print sizes and dates in human readable format
                        (default true)
      --no-trunc        Don't truncate output
  -q, --quiet           Only show image IDs

构建自己的CentOS

FROM centos
LABEL author="HelloChen" \
      version=1.0        \
      description="This text illustrates that label-values can span multiple lines."
ENV MYPATH=/usr/local
WORKDIR $MYPATH
RUN yum -y install vim 
RUN yum -y install net-tools 
EXPOSE 80
CMD echo ${MYPATH} 
CMD /bin/bash