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dockerfileでパスワードを求めないsudoer作り(Alpine、Debian、Ubuntu、Centos)

Last updated at Posted at 2020-06-21

紹介する内容

  • Alpine、Debian、Ubuntu、Centosの例です
    • uidとデフォルトshell設定を含みます

結論

  • Alpine linux他はsudoerの作り方が似てます
  • dockerのvolumeでpermission denied問題解決や、作りたいときに使えます

紹介始めます

ディレクトリ構成

全体ソースコードは https://github.com/cheekykorkind/qiita-example/tree/master/dockerfiles/no-password-sudoer で確認できます

  • 全体図
    Dockerfileの名はどのLinuxかをわかりやすく表現しました。
    AlpineDockerfileはAlpine 3.11
    CentosDockerfileはCentos 7
    DebianDockerfileはDebian buster
    UbuntuDockerfileはubuntu 18.04
    allD.png

Dockerfileの中身

  • AlpineDockerfile
    • Alpine linuxだけがsudoerの作り方が違う気がします
FROM alpine:3.11

RUN apk add sudo

RUN adduser -D -u 1001 -s /bin/sh -G wheel alpine-sudoer
RUN echo '%wheel ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers
  • CentosDockerfile

FROM centos:7

RUN yum -y install sudo

RUN useradd --uid 1001 --create-home --shell /bin/bash -G wheel,root centos-sudoer
RUN echo '%wheel ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
  • DebianDockerfile
FROM debian:buster-slim

RUN apt update && apt install -y sudo

RUN useradd --uid 1001 --create-home --shell /bin/sh -G sudo,root debian-sudoer
RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
  • UbuntuDockerfile
FROM ubuntu:18.04

RUN apt update && apt install -y sudo

RUN useradd --uid 1001 --create-home --shell /bin/bash -G sudo,root ubuntu-sudoer
RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

試し順番です

  1. デレクトリー移動
  • cd qitta-example/dockerfiles/no-password-sudoer
  1. dockerコンテナをバックグラウンドで起動
  • docker-compose up -d
  1. 各々のdockerコンテナにsudoerが作られたか確認します
  • docker exec -it alpine-sudoer /bin/sh -e -c "cat /etc/passwd | grep alpine-sudoer"
  • docker exec -it debian-sudoer /bin/sh -e -c "cat /etc/passwd | grep debian-sudoer"
  • docker exec -it ubuntu-sudoer /bin/bash -e -c "cat /etc/passwd | grep ubuntu-sudoer"
  • docker exec -it centos-sudoer /bin/bash -e -c "cat /etc/passwd | grep centos-sudoer"
    checkSudoers.png
  1. (選択)自由に確認したいなら、入りたいdockerコンテナに入ります
  • docker exec -it alpine-sudoer /bin/sh
  • docker exec -it debian-sudoer /bin/sh
  • docker exec -it ubuntu-sudoer /bin/bash
  • docker exec -it centos-sudoer /bin/bash
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