2021/06/19 토요일

Introduction

WSL2에서 Ubuntu-20.04를 즐겨 보았습니다.
그 때에 빠진 일에 대해 기사로 둡니다.
도움이되면 다행입니다.

What to do?

다음 작업을 수행했습니다.

Windows 10 업데이트(20H1)

WSL2 설치

Ubuntu-20.04 설치

Docker Desktop for Windows 설치

Ubuntu-20.04에서 sudo apt-get update ← 문제 발생

(사건 1) Ubuntu-20.04 기동 직후에 sudo apt-get update 할 수 없다

(전제) Windows 10은 Wi-Fi 액세스 포인트 경유로 인터넷에 접속하고 있었다.

원인

WSL2의 가상 네트워크 어댑터 vEthernet (WSL)가 인터넷에 연결되지 않았습니다.

해결

Wi-Fi 네트워크 어댑터 공유를 활성화합니다.

네트워크의 다른 사용자가이 컴퓨터의 인터넷 연결을 통한 연결을 허용합니다.

(사건 2) 이름 해석을 할 수 없다

host google.com

사건 1을 해결했지만. .
위의 명령으로 이름을 확인할 수 없습니다.

원인

Linux 컨테이너 (Ubuntu)의 resolv.conf에서 컨테이너 내의 IP 주소가 설정되었습니다.
따라서 이름 해석이 불가능하고 apt-get이 실패했습니다.

해결

/etc/resolv.comf 에 nameserver 8.8.8.8 추가

sudo rm /etc/resolv.conf
sudo sh -c "echo 'nameserver 8.8.8.8' > /etc/resolv.conf"
host google.com

(사건 3) sudo apt-get update에서 Err :이 표시됩니다.

사건 1, 사건 2를 해결했지만. .
fetch가 실패합니다.

$ sudo apt-get update
Err:1 http://archive.ubuntu.com/ubuntu focal InRelease
  Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (91.189.88.142), connection timed out Could not connect to archive.ubuntu.com:80 (91.189.88.152), connection timed out
Err:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease
  Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable)
Err:3 http://archive.ubuntu.com/ubuntu focal-backports InRelease
  Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable)
Err:4 http://security.ubuntu.com/ubuntu focal-security InRelease
  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::18). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/InRelease  Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (91.189.88.142), connection timed out Could not connect to archive.ubuntu.com:80 (91.189.88.152), connection timed outW: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease  Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable)
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease  Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable)
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::18). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out
W: Some index files failed to download. They have been ignored, or old ones used instead.

원인

바이러스 소프트의 방화벽이 방해하고 있었다.

제 경우에는 Symantec Endpoint Protection이 방해를 받았습니다.

해결

방화벽 기능을 일시적으로 비활성화합니다.

Conclusion

WSL2의 Ubuntu-20.04 컨테이너의 네트워크 메커니즘은 Linux만큼 솔직하지 않을 것입니다.
우분투 머신에서 리눅스 컨테이너를 설정했을 때 아무 문제없이 작동했습니다.

뭔가 도움이되면 다행입니다. 👍

(了)