docker alpineで/bin/shを使ってみる。

■docker alpineで/bin/shを使ってみる。
　以下の続き。

　dockerでHello Worldしてみる。
　https://labunix.hateblo.jp/entry/20200908/1599492125

■前回のゴミを削除

$ docker ps -a | awk '$2 ~ /hello-world/{print "docker rm -f "$1 | "sh"}'
90ce255d3b90
d66e4f829335
0cc999eb7e59
3a93386ef7cd
b6be63be1de7
82790f2cdfde
878d411ba706
78e0c25f191d

■json確認用にjqをインストール

$ sudo apt-get install -y jq
$ jq --version
jq-1.5-1-a5b5cbe

■オフィシャルのalpineを検索

$ docker search --filter is-official=true alpine
NAME                DESCRIPTION                                     STARS               OFFICIAL            AUTOMATED
alpine              A minimal Docker image based on Alpine Linux…   6750                [OK]                

■alpineのイメージをダウンロード

$ docker pull alpine
Using default tag: latest
latest: Pulling from library/alpine
df20fa9351a1: Pull complete 
Digest: sha256:185518070891758909c9f839cf4ca393ee977ac378609f700f60a771a2dfe321
Status: Downloaded newer image for alpine:latest

■詳細のJsonからコマンドを確認。

$ docker inspect alpine | jq '.[].Config | .Cmd[]'
"/bin/sh"

■alpineコンテナに対話型に仮想TTYに接続。

$ docker container run -it alpine
/ # ls bin/
arch           date           fdflush        kbd_mode       mknod          ping6          setpriv        umount
ash            dd             fgrep          kill           mktemp         pipe_progress  setserial      uname
base64         df             fsync          link           more           printenv       sh             usleep
bbconfig       dmesg          getopt         linux32        mount          ps             sleep          watch
busybox        dnsdomainname  grep           linux64        mountpoint     pwd            stat           zcat
cat            dumpkmap       gunzip         ln             mpstat         reformime      stty
chgrp          echo           gzip           login          mv             rev            su
chmod          ed             hostname       ls             netstat        rm             sync
chown          egrep          ionice         lzop           nice           rmdir          tar
conspy         false          iostat         makemime       pidof          run-parts      touch
cp             fatattr        ipcalc         mkdir          ping           sed            true

/ # exit

■ログの確認

$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
f09d2c9dc1c8        alpine              "/bin/sh"           5 minutes ago       Exited (0) 29 seconds ago                       peaceful_stallman

$ docker logs f09d2c9dc1c8
/ # ls bin/
arch           date           fdflush        kbd_mode       mknod          ping6          setpriv        umount
ash            dd             fgrep          kill           mktemp         pipe_progress  setserial      uname
base64         df             fsync          link           more           printenv       sh             usleep
bbconfig       dmesg          getopt         linux32        mount          ps             sleep          watch
busybox        dnsdomainname  grep           linux64        mountpoint     pwd            stat           zcat
cat            dumpkmap       gunzip         ln             mpstat         reformime      stty
chgrp          echo           gzip           login          mv             rev            su
chmod          ed             hostname       ls             netstat        rm             sync
chown          egrep          ionice         lzop           nice           rmdir          tar
conspy         false          iostat         makemime       pidof          run-parts      touch
cp             fatattr        ipcalc         mkdir          ping           sed            true
/ # exit

■docker container execを使ってコンテナに入ってみる。

$ docker container run -it alpine
/ # 

※別のシェルから。

$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
02fa7cd2ef04        alpine              "/bin/sh"           27 seconds ago      Up 25 seconds                           infallible_yalow

$ docker container exec -it 02fa7cd2ef04 /bin/sh
/ # exit

$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS               NAMES
02fa7cd2ef04        alpine              "/bin/sh"           About a minute ago   Up About a minute                       infallible_yalow

※元のシェル(alpine)を抜ける。

/ # ls
bin    dev    etc    home   lib    media  mnt    opt    proc   root   run    sbin   srv    sys    tmp    usr    var
/ # exit

$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

$ docker logs 02fa7cd2ef04
/ # ls
bin    dev    etc    home   lib    media  mnt    opt    proc   root   run    sbin   srv    sys    tmp    usr    var
/ # exit