When using the docker container, we always want to see what the container looks like inside: we can use the docker exec command to meet our expectations:

➜  compose docker exec --help

Usage:    docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

Run a command in a running container

Options:
  -d, --detach               Detached mode: run command in the background
      --detach-keys string   Override the key sequence for detaching a container
  -e, --env list             Set environment variables
  -i, --interactive          Keep STDIN open even if not attached
      --privileged           Give extended privileges to the command
  -t, --tty                  Allocate a pseudo-TTY
  -u, --user string          Username or UID (format: <name|uid>[:<group|gid>])
  -w, --workdir string       Working directory inside the container

The name of the container added to us is compose web 1. Use the following command:

docker exec  -it compose_web_1 /bin/sh

I found that the internal situation is as follows:

/code # cd ..
/ # ls
bin    code   dev    etc    home   lib    media  mnt    proc   root   run    sbin   srv    sys    tmp    usr    var
/ # ls bin/
arch           chown          dumpkmap       fsync          ipcalc         ls             mountpoint     pipe_progress  run-parts      su             watch
ash            conspy         echo           getopt         kbd_mode       lzop           mpstat         printenv       sed            sync           zcat
base64         cp             ed             grep           kill           makemime       mv             ps             setpriv        tar
bbconfig       date           egrep          gunzip         link           mkdir          netstat        pwd            setserial      touch
busybox        dd             false          gzip           linux32        mknod          nice           reformime      sh             true
cat            df             fatattr        hostname       linux64        mktemp         pidof          rev            sleep          umount
chgrp          dmesg          fdflush        ionice         ln             more           ping           rm             stat           uname
chmod          dnsdomainname  fgrep          iostat         login          mount          ping6          rmdir          stty           usleep

At present, it has entered the internal docker container. This is the file distribution. What is the specific principle? Is it a linux virtual machine? Is it a complete linux kernel? What else? I have some questions in my heart. Let's talk about it in this post! Check the above command, busybox command also aroused my interest? We'll investigate later.

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