Forcing https in elasticbeanstalk with certificate from ACM - ruby-on-rails

Question

I have provisioned a scalable EB(Elasticbeanstalk) rails(puma) instance. I have applied for https through ACM(Amazon Certificate Manager) and applied it to my load balancer. HTTPS is enabled for my website now. But how do I force redirect to https? I have tried a number of solutions online where it was suggested to make a nginx configuration setting manually through .ebextensions and I am not sure where to get the certificate from ACM for this?(I am assuming that is not possible with ACM right now?). How do I force HTTPS?

Answer 1

The current AWS EB Rails and Node.js setups both use nginx (if your web server is apache see this answer), so the following should work (adapted from this question):
Create the file .ebextensions/01-force-https.config (the .config is important, not .conf) with the following content.
If your environment is a single instance:
files:
"/etc/nginx/conf.d/01-force-https.conf":
owner: root
group: root
mode: "000644"
content: |
server {
listen 8080;
return 301 https://$host$request_uri;
}
If your environment is load balanced, you unfortunately cannot simply add to the existing config but need to modify it with sed:
files:
"/tmp/45_nginx_https_rw.sh":
owner: root
group: root
mode: "000644"
content: |
#! /bin/bash
CONFIGURED=`grep -c "return 301 https" /opt/elasticbeanstalk/support/conf/webapp_healthd.conf`
if [ $CONFIGURED = 0 ]
then
sed -i '/listen 80;/a \ if ($http_x_forwarded_proto = "http") { return 301 https://$host$request_uri; }\n' /opt/elasticbeanstalk/support/conf/webapp_healthd.conf
logger -t nginx_rw "https rewrite rules added"
exit 0
else
logger -t nginx_rw "https rewrite rules already set"
exit 0
fi
container_commands:
00_appdeploy_rewrite_hook:
command: cp -v /tmp/45_nginx_https_rw.sh /opt/elasticbeanstalk/hooks/appdeploy/enact
01_configdeploy_rewrite_hook:
command: cp -v /tmp/45_nginx_https_rw.sh /opt/elasticbeanstalk/hooks/configdeploy/enact
02_rewrite_hook_perms:
command: chmod 755 /opt/elasticbeanstalk/hooks/appdeploy/enact/45_nginx_https_rw.sh /opt/elasticbeanstalk/hooks/configdeploy/enact/45_nginx_https_rw.sh
03_rewrite_hook_ownership:
command: chown root:users /opt/elasticbeanstalk/hooks/appdeploy/enact/45_nginx_https_rw.sh /opt/elasticbeanstalk/hooks/configdeploy/enact/45_nginx_https_rw.sh
Then add it to your git repo or app bundle and eb deploy. This creates /etc/nginx/conf.d/01-force-https.conf which is automatically included from /etc/nginx/nginx.conf. Note that eb deploy won't delete the file on the server if you later remove the corresponding file from .ebextensions. Also, I found the following helpful in debugging through eb ssh:
sudo service nginx configtest
sudo service nginx restart

Answer 2

AWS has a help article for HTTP to HTTPS redirection here:
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/configuring-https-httpredirect.html
It covers 2 main approaches, and has links to the relevant scripts you can use to do it all for you (which they maintain as they update the Elastic Beanstalk platform).