GCP 에서 메모리 업그레이드 후 웹 접속이 되지 않던 문제에 대한 해결과정 기록

iptables 명령을 통한 port redirection
1. 80 → 8080
  1. sudo iptables -A PREROUTING -t nat -i ens4 -p tcp --dport 80 -j REDIRECT --to-port 8080
2. 443 → 8443
  1. sudo iptables -A PREROUTING -t nat -i ens4 -p tcp --dport 443 -j REDIRECT --to-port 8443

tomcat server.xml 에 ssl 관련 설정 적용

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol" SSLEnabled="true"
               maxThread="150" scheme="https" secure="true"
               keystoreFile="/home/tomcat/conf/certs/sample.pfx" keystorePass="****" keystoreType="PKCS12"
               clientAuth="false" sslProtocol="TLS" />

tomcat web.xml 에 아래 항목 추가

<security-constraint>
	<web-resource-collection>
		  <web-resource-name>Automatic SSL Forward</web-resource-name>
		  <url-pattern>/*</url-pattern>
	</web-resource-collection>
	<user-data-constraint>
		  <transport-guarantee>
				CONFIDENTIAL
		  </transport-guarantee>
	</user-data-constraint>
</security-constraint>