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사물인터넷: 46. Raspberry PI Zero (W)에 docker 설치 [링크 복사], [링크+제목 복사]
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정성태 (techsharer at outlook.com)
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Raspberry PI Zero (W)에 docker 설치

Synology NAS에 실습을 해 본 김에,

Synology NAS(DS216+II)에 docker 설치 후 .NET Core 2.1 응용 프로그램 실행하는 방법
; https://www.sysnet.pe.kr/2/0/11713

어차피 같은 Linux 계열 운영체제이니 이 참에 가지고 있던 Raspberry PI Zero 모델에 docker를 올려봤습니다. 물론, 상세한 문서가 이미 다음과 같이 공개되어 있습니다. ^^

Get Docker CE for Debian
; https://docs.docker.com/install/linux/docker-ce/debian/

중간에 "Install using the repository"에 보면 "Raspbian users cannot use this method!"라고 하면서 "convenience script"를 사용하라고 합니다. 이름만큼이나... 정말 설치 방법이 간단한데 그냥 다음과 같이 실행해 주면 해당 스크립트 안에서 모든 작업을 알아서 해줍니다.

$ sudo -i

~# curl -sSL https://get.docker.com  | sh
# Executing docker install script, commit: 36b78b2
+ sh -c apt-get update -qq >/dev/null
+ sh -c apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null
+ sh -c curl -fsSL "https://download.docker.com/linux/raspbian/gpg" | apt-key add -qq - >/dev/null
Warning: apt-key output should not be parsed (stdout is not a terminal)
+ sh -c echo "deb [arch=armhf] https://download.docker.com/linux/raspbian stretch edge" > /etc/apt/sou                          docker.list
+ [ raspbian = debian ]
+ sh -c apt-get update -qq >/dev/null
+ sh -c apt-get install -y -qq --no-install-recommends docker-ce >/dev/null
+ sh -c docker version
Client:
 Version:           18.06.1-ce
 API version:       1.38
 Go version:        go1.10.3
 Git commit:        e68fc7a
 Built:             Tue Aug 21 17:30:52 2018
 OS/Arch:           linux/arm
 Experimental:      false

Server:
 Engine:
  Version:          18.06.1-ce
  API version:      1.38 (minimum version 1.12)
  Go version:       go1.10.3
  Git commit:       e68fc7a
  Built:            Tue Aug 21 17:26:37 2018
  OS/Arch:          linux/arm
  Experimental:     false
If you would like to use Docker as a non-root user, you should now consider
adding your user to the "docker" group with something like:

  sudo usermod -aG docker your-user

Remember that you will have to log out and back in for this to take effect!

WARNING: Adding a user to the "docker" group will grant the ability to run
         containers which can be used to obtain root privileges on the
         docker host.
         Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
         for more information.

끝입니다. ^^ 단지, 메시지에 보이는 데로 docker 명령어는 원래 sudo 권한으로 실행해야 하는데 "usermod -aG docker [사용자계정]"으로 추가한 계정에 대해서는 sudo를 붙이지 않아도 docker 명령어를 사용할 수 있으니 원한다면 (편의상) 그렇게 해줍니다.




그런데 라즈베리 파이 제로의 CPU가 armv6l 기반이라서,

$ uname -a
Linux rasp01 4.14.73+ #1148 Mon Oct 1 16:41:23 BST 2018 armv6l GNU/Linux

적절한 docker 이미지를 찾는 것이 쉽지 않습니다. 가령, arm 계열을 위한 hello-world 예제인 듯 보이는 이미지를 실행해도,

$ docker run armhf/hello-world
$

보는 바와 같이 아무런 출력이 없고 container는 그냥 종료된 상태입니다. 검색해 보면 다음의 (답변 없는) 상황과 일치합니다.

Docker run does not display any output
; https://stackoverflow.com/questions/52233182/docker-run-does-not-display-any-output

Rasberry PI Zero도 다음의 명령어 결과로 봐서는 armhf이긴 한 것 같은데,

$ dpkg --print-architecture
armhf

좀 더 찾아 보면,

What is difference between arm64 and armhf?
; https://stackoverflow.com/questions/37790029/what-is-difference-between-arm64-and-armhf

armhf stands for "arm hard float", and is the name given to a debian port for arm processors (armv7+) that have hardware floating point support.


armv7 이후의 모델에 해당한다고 합니다. Rasberry PI Zero의 경우 armv6l이기 때문에 아마도 armhf 접두사가 붙은 docker 이미지들은 실행을 못하는 것 같습니다. 검색해 보면, resin에서 배포하는 이미지들이 그나마 armv6에 대한 것들이 있는 데요,

C:> docker search "Raspberry"  --limit 100 --no-trunc
NAME                                          DESCRIPTION                                                                                           STARS               OFFICIAL            AUTOMATED
homeassistant/raspberrypi3-homeassistant                                                                                                            81
sdthirlwall/raspberry-pi-cross-compiler       Raspberry Pi cross-compiler and sysroot in a box.                                                     30                                      [OK]
resin/raspberrypi3-python                     The Python buildpack image for Python apps for Raspberry Pi 3. Maintained by Resin.io.                28
resin/raspberrypi3-debian                     The bare bones OS image for Raspberry Pi 3. Maintained by Resin.io.                                   20
sdt4docker/raspberry-pi-cross-compiler        Raspberry Pi cross-compiler in a box.                                                                 19                                      [OK]
resin/raspberrypi3-node                       Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   15
resin/raspberry-pi-alpine-node                Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   12
resin/raspberry-pi-python                     The Python buildpack image for Python apps for Raspberry Pi v1 & ZERO. Maintained by Resin.io.        11
resin/raspberry-pi-alpine                     The bare bones Alpine Linux OS image for Raspberry Pi v1 & ZERO. Maintained by Resin.io.              10
resin/raspberrypi2-node                       This repository is obsolete.                                                                          9
homeassistant/raspberrypi2-homeassistant                                                                                                            7
resin/raspberrypi2-python                     This repository is obsolete.                                                                          7
resin/raspberrypi3-alpine-python              The Python buildpack image for Python apps. Maintained by Resin.io.                                   7
resin/raspberrypi3-alpine                     The bare bones Alpine Linux OS image for Raspberry Pi 3. Maintained by Resin.io.                      6
resin/raspberry-pi2-python                    The Python buildpack image for Python apps for Raspberry Pi 2. Maintained by Resin.io.                5
resin/raspberrypi3-alpine-node                Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   5
resin/raspberrypi2-debian                     This repository is obsolete.                                                                          5
homeassistant/raspberrypi-homeassistant                                                                                                             5
resin/raspberry-pi-node                       Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   4
microsoft/iot-hub-c-raspberrypi-build         Includes toolchain for building Raspberry Pi C code                                                   4
resin/raspberrypi2-alpine                     This repository is obsolete.                                                                          4
resin/raspberrypi-node                        This repository is obsolete.                                                                          4
demosense/raspberrypi3-opencv                 Based on resin/raspberrypi3-python:3.6 installed opencv                                               4
resin/raspberry-pi-openjdk                    OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            3
resin/raspberry-pi-debian                     The bare bones OS image for Raspberry Pi v1 & ZERO. Maintained by Resin.io.                           3
homeassistant/raspberrypi3-64-homeassistant                                                                                                         3
resin/raspberrypi-buildpack-deps              This repository is obsolete.                                                                          3
resin/raspberrypi-python                      This repository is obsolete.                                                                          2
resin/raspberry-pi-golang                     Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            2
resin/raspberrypi2-buildpack-deps             This repository is obsolete.                                                                          2
resin/raspberrypi2-alpine-node                This repository is obsolete.                                                                          2
resin/raspberry-pi3-python                    This repository is obsolete.                                                                          2
resin/raspberry-pi2-debian                    The bare bones OS image for Raspberry Pi 2. Maintained by Resin.io.                                   2
resin/raspberrypi-golang                      This repository is obsolete.                                                                          2
resin/raspberry-pi3-node                      This repository is obsolete.                                                                          1
resin/raspberrypi2-alpine-python              This repository is obsolete.                                                                          1
resin/raspberrypi2-golang                     This repository is obsolete.                                                                          1
resin/raspberry-pi-alpine-python              The Python buildpack image for Python apps. Maintained by Resin.io.                                   1
resin/raspberry-pi-alpine-golang              Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            1
resin/raspberry-pi2-alpine-golang             Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            1
resin/raspberrypi3-openjdk                    OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            1
resin/raspberry-pi2-alpine-node               Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   1
resin/raspberrypi-alpine-python               This repository is obsolete.                                                                          1
resin/raspberry-pi2-node                      Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   1
resin/raspberrypi3-alpine-openjdk             OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            1
resin/raspberry-pi2-openjdk                   OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            1
resin/raspberry-pi-alpine-openjdk             OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            1
resin/raspberry-pi2-alpine                    The bare bones Alpine Linux OS image for Raspberry Pi 2. Maintained by Resin.io.                      1
resin/raspberrypi3-buildpack-deps             A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
habridge/ha-bridge-raspberry-pi2              Docker image of ha-bridge (https://github.com/bwssytems/ha-bridge) specialized for Raspberry Pi 2     0
resin/raspberry-pi2-fedora-node               Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   0
resin/raspberrypi2-fedora-node                This repository is obsolete.                                                                          0
resin/raspberrypi3-fedora                     Docker builds of Fedora from Resin for Raspberry Pi 3. Maintained by Resin.io.                        0
resin/raspberrypi2-fedora-golang              This repository is obsolete.                                                                          0
resin/raspberrypi3-alpine-buildpack-deps      A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberry-pi2-fedora-golang             Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            0
resin/raspberry-pi2-alpine-python             The Python buildpack image for Python apps. Maintained by Resin.io.                                   0
resin/raspberry-pi3-golang                    This repository is obsolete.                                                                          0
jekotia/resin-raspberrypi3-alpine-node        resin-raspberrypi3-alpine-node                                                                        0                                       [OK]
resin/raspberry-pi2-fedora                    Docker builds of Fedora from Resin for Raspberry Pi 2. Maintained by Resin.io.                        0
resin/raspberrypi3-fedora-python              The Python buildpack image for Python apps. Maintained by Resin.io.                                   0
resin/raspberrypi2-alpine-buildpack-deps      This repository is obsolete.                                                                          0
resin/raspberry-pi2-buildpack-deps            A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberrypi3-fedora-golang              Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            0
resin/raspberrypi-openjdk                     This repository is obsolete.                                                                          0
resin/raspberrypi3-fedora-buildpack-deps      A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberry-pi-alpine-buildpack-deps      A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberrypi-alpine-golang               This repository is obsolete.                                                                          0
resin/raspberry-pi2-alpine-openjdk            OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            0
resin/raspberrypi-alpine-buildpack-deps       This repository is obsolete.                                                                          0
resin/raspberry-pi2-alpine-buildpack-deps     A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberrypi2-alpine-golang              This repository is obsolete.                                                                          0
resin/raspberry-pi3-alpine-node               This repository is obsolete.                                                                          0
resin/raspberry-pi-buildpack-deps             A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberrypi3-fedora-node                Node.js is a JavaScript-based platform for server-side and networking apps. Maintained by Resin.io.   0
resin/raspberrypi2-alpine-openjdk             This repository is obsolete.                                                                          0
resin/raspberry-pi2-golang                    Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            0
resin/raspberry-pi3-alpine-golang             This repository is obsolete.                                                                          0
resin/raspberrypi3-fedora-openjdk             OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            0
resin/raspberrypi-alpine-node                 This repository is obsolete.                                                                          0
resin/raspberrypi2-fedora-python              This repository is obsolete.                                                                          0
resin/raspberry-pi2-fedora-buildpack-deps     A collection of common dependencies used for installing various modules. Maintained by Resin.io.      0
resin/raspberrypi-alpine                      This repository is obsolete.                                                                          0
resin/raspberry-pi3-alpine-python             This repository is obsolete.                                                                          0
resin/raspberry-pi2-fedora-python             The Python buildpack image for Python apps. Maintained by Resin.io.                                   0
habridge/ha-bridge-raspberrypi3               Docker image of ha-bridge (https://github.com/bwssytems/ha-bridge) specialized for Raspberry Pi 3     0
resin/raspberrypi2-fedora-buildpack-deps      This repository is obsolete.                                                                          0
eyigitoglu/raspberrypitest                                                                                                                          0
resin/raspberrypi3-alpine-golang              Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            0
resin/raspberrypi3-golang                     Go (golang) is a general purpose, imperative programming language. Maintained by Resin.io.            0
resin/raspberrypi2-openjdk                    This repository is obsolete.                                                                          0
resin/raspberrypi2-fedora                     This repository is obsolete.                                                                          0
raspberrypython/noddyws                       A noddy web server serving a blank html page with a random background color                           0                                       [OK]
gbevin/raspberry-ci                           Raspbian Jessie image for running Continuous Integration UI tests with Docker on a Raspberry PI.      0
resin/raspberrypi2-fedora-openjdk             This repository is obsolete.                                                                          0
resin/raspberry-pi2-ubuntu-node                                                                                                                     0
jekotia/resin-raspberrypi3-debian             resin-raspberrypi3-debian                                                                             0                                       [OK]
resin/raspberry-pi2-fedora-openjdk            OpenJDK is an open-source implementation of the Java Platform, SE. Maintained by Resin.io.            0
resin/raspberrypi3-ubuntu-node                                                                                                                      0
resin/raspberry-pi3-alpine-openjdk            This repository is obsolete.                                                                          0

실제로 "The bare bones OS image for Raspberry Pi v1 & ZERO. Maintained by Resin.io."라고 하는 "resin/raspberry-pi-debian" 이미지를,

resin/raspberry-pi-debian
; https://hub.docker.com/r/resin/raspberry-pi-debian/

실행해 보면,

$ docker run --rm resin/raspberry-pi-debian echo Test
Test
$

저렇게 결과가 출력되는 것을 확인할 수 있습니다.




그렇다면 혹시 .NET Core 응용 프로그램을 실행해 볼 수 있을까요? docker는 CPU의 명령어까지 가상화하는 수준은 아니므로 docker image에 포함된 바이너리 역시 docker 환경이 실행되는 CPU의 제약을 받습니다. .NET Core의 경우 ARM 버전에 포팅된 것이,

.NET Core on Raspberry Pi
; https://github.com/dotnet/core/blob/master/samples/RaspberryPiInstructions.md

armv7 CPU의 명령어 셋을 내포하기 때문에 docker를 이용해도 .NET Core 응용 프로그램을 실행할 수 없습니다.




참고로, docker를 라즈베리 파이가 지원하지 않는 CPU 버전으로 설치하는 경우 다음과 같은 식의 오류가 발생합니다.

$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 95, in <module>
    sp = SoftwareProperties(options=options)
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 109, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 599, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 89, in get_sources
    (self.id, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Raspbian/stretch

또한, "Get Docker CE for Debian" 공식 문서에 나온 "https://get.docker.com"의 script가 아니라 "https://download.docker.com/linux/debian"으로부터 "apt-get install docker-ce" 명령어로 직접 설치하려는 경우 다음과 같은 식의 설치 오류가 발생합니다.

$ sudo apt-get -y install docker-ce
Reading package lists... Done
Building dependency tree
Reading state information... Done
docker-ce is already the newest version (18.06.1~ce~3-0~debian).
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up docker-ce (18.06.1~ce~3-0~debian) ...
Job for docker.service failed because a fatal signal was delivered causing the control process to dump core.
See "systemctl status docker.service" and "journalctl -xe" for details.
invoke-rc.d: initscript docker, action "start" failed.
 docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: core-dump) since Wed 2018-10-03 12:36:15 KST; 191ms ago
     Docs: https://docs.docker.com
  Process: 3636 ExecStart=/usr/bin/dockerd -H fd:// (code=dumped, signal=SEGV)
 Main PID: 3636 (code=dumped, signal=SEGV)
      CPU: 546ms

Oct 03 12:36:15 rasp01 systemd[1]: docker.service: Unit entered failed state.
Oct 03 12:36:15 rasp01 systemd[1]: docker.service: Failed with result 'core-dump'.
Oct 03 12:36:16 rasp01 systemd[1]: docker.service: Service hold-off time over, scheduling restart.
Oct 03 12:36:16 rasp01 systemd[1]: Stopped Docker Application Container Engine.
dpkg: error processing package docker-ce (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 docker-ce
E: Sub-process /usr/bin/dpkg returned an error code (1)

journalctl 명령어로 보면 다음과 같은 로그만 있을 뿐입니다.

$ journalctl -u docker.service

Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Main process exited, code=dumped, status=11/SEGV
Oct 03 13:14:35 rasp01 systemd[1]: Failed to start Docker Application Container Engine.
Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Unit entered failed state.
Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Failed with result 'core-dump'.
Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Service hold-off time over, scheduling restart.
Oct 03 13:14:35 rasp01 systemd[1]: Stopped Docker Application Container Engine.
Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Start request repeated too quickly.
Oct 03 13:14:35 rasp01 systemd[1]: Failed to start Docker Application Container Engine.
Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Unit entered failed state.
Oct 03 13:14:35 rasp01 systemd[1]: docker.service: Failed with result 'core-dump'.




armhf에 대해 좀 더 찾아 보니,

2.1. 지원하는 하드웨어
; https://www.debian.org/releases/jessie/armhf/ch02s01.html.ko

다음과 같은 설명이 있습니다.

  • 데비안/armel은 오래된 32비트 ARM 프로세서로 하드웨어 부동 소수점 기능(FPU)이 없는 프로세서이고,
  • 데비안/armhf는 최소한 ARMv7 아키텍쳐를 구현하고 ARM vector floating point specification의 버전3를(VFPv3) 구현한 최근의 ARM 프로세서에서만 동작합니다. 이 모델의 프로세서에 들어 있는 확장된 기능을 사용하므로 성능이 높습니다.
  • 데비안/arm64는 최소한 ARMv8 아키텍쳐를 구현한 64비트 ARM 프로세서입니다.




[이 글에 대해서 여러분들과 의견을 공유하고 싶습니다. 틀리거나 미흡한 부분 또는 의문 사항이 있으시면 언제든 댓글 남겨주십시오.]





[최초 등록일: ]
[최종 수정일: 10/3/2018 ]

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이 저작물은 크리에이티브 커먼즈 코리아 저작자표시-비영리-변경금지 2.0 대한민국 라이센스에 따라 이용하실 수 있습니다.
by SeongTae Jeong, mailto:techsharer@outlook.com

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11935정성태5/7/20201541.NET Framework: 843. C# - PLplot 출력을 파일이 아닌 Window 화면으로 변경
11934정성태6/7/20191992VC++: 133. typedef struct와 타입 전방 선언으로 인한 C2371 오류파일 다운로드1
11933정성태6/7/20191913VC++: 132. enum 정의를 C++11의 enum class로 바꿀 때 유의할 사항파일 다운로드1
11932정성태6/7/20191541오류 유형: 544. C++ - fatal error C1017: invalid integer constant expression파일 다운로드1
11931정성태6/6/20191564개발 환경 구성: 441. C# - CairoSharp/GtkSharp 사용을 위한 프로젝트 구성 방법
11930정성태6/26/20191952.NET Framework: 842. .NET Reflection을 대체할 System.Reflection.Metadata 소개 [1]
11929정성태6/5/20191393.NET Framework: 841. Windows Forms/C# - 클립보드에 RTF 텍스트를 복사 및 확인하는 방법
11928정성태6/5/20191374오류 유형: 543. PowerShell 확장 설치 시 "Catalog file '[...].cat' is not found in the contents of the module" 오류 발생
11927정성태6/5/20191592스크립트: 15. PowerShell ISE의 스크립트를 복사 후 PPT/Word에 붙여 넣으면 한글이 깨지는 문제 [1]
11926정성태6/4/20192182오류 유형: 542. Visual Studio - pointer to incomplete class type is not allowed
11925정성태6/4/20191823VC++: 131. Visual C++ - uuid 확장 속성과 __uuidof 확장 연산자파일 다운로드1
11924정성태5/30/20191999Math: 57. C# - 해석학적 방법을 이용한 최소 자승법 [1]파일 다운로드1
11923정성태5/30/20191755Math: 56. C# - 그래프 그리기로 알아보는 경사 하강법의 최소/최댓값 구하기파일 다운로드1
11922정성태5/30/20191199.NET Framework: 840. ML.NET 데이터 정규화파일 다운로드1
11921정성태5/28/20192046Math: 55. C# - 다항식을 위한 최소 자승법(Least Squares Method)파일 다운로드1
11920정성태5/28/20191296.NET Framework: 839. C# - PLplot 색상 제어
11919정성태5/27/20191921Math: 54. C# - 최소 자승법의 1차 함수에 대한 매개변수를 단순 for 문으로 구하는 방법 [1]파일 다운로드1
11918정성태5/27/20192026Math: 53. C# - 행렬식을 이용한 최소 자승법(LSM: Least Square Method)파일 다운로드1
11917정성태5/24/20191975Math: 52. MathNet을 이용한 간단한 통계 정보 처리 - 분산/표준편차파일 다운로드1
11916정성태5/24/20191395Math: 51. MathNET + OxyPlot을 이용한 간단한 통계 정보 처리 - Histogram파일 다운로드1
11915정성태5/24/20191628Linux: 11. 리눅스의 환경 변수 관련 함수 정리 - putenv, setenv, unsetenv
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