Hello world!

(1) 검증하지 않는 않는 옵션(-k) 사용

curl -k {URL}

(2) 인증서를 발급한 기관을 신뢰하는 인증기관 목록에 추가

$ sudo mkdir /usr/local/share/ca-certificates/{기관명}

$ openssl s_client -connect {URL}:443 |tee certlog

$ openssl x509 -inform PEM -in certlog -text -out certdata

$ openssl x509 -inform PEM -text -in certdata 

$ sudo cat certdata >> /usr/local/share/ca-certificates/{기관명}/ca-bundle.crt

$ sudo update-ca-certificates

curl 에 신뢰하는 인증기관 인증서(CA Cert) 추가하기 (lesstif.com)

https 연결시 서버의 SSL 인증서 추출하기 (curl 또는 web browser 사용) (lesstif.com)

How to install certificates for command line - Ask Ubuntu

https://zelkun.tistory.com/entry/Virtual-Box-Ubuntu-Server1404-%EB%B2%84%EC%B6%94%EC%96%BC%EB%B0%95%EC%8A%A4-%EC%9A%B0%EB%B6%84%ED%88%AC-%EC%84%9C%EB%B2%84-%ED%8F%B4%EB%8D%94%EA%B3%B5%EC%9C%A0

sudo cp /etc/apt/sources.list /etc/apt/sources.list.old && sudo sed -i 's/kr.archive.ubuntu.com/ftp.daumkakao.com/g' /etc/apt/sources.list

sudo apt-get purge -y docker-engine docker docker.io docker-ce docker-ce-cli

sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce

sudo rm -rf /var/lib/docker /etc/docker

sudo rm /etc/apparmor.d/docker

sudo groupdel docker

sudo rm -rf /var/run/docker.sock

References

https://askubuntu.com/questions/935569/how-to-completely-uninstall-docker

$ iptables -A PREROUTING -t nat -p udp  -d {EXTERNAL_IP} --dport {EXTERNAL_PORT} -j DNAT --to {INTERNAL_IP}:{INTERNAL_PORT}

References

https://blog.lael.be/post/69