Hi All Background: I am using Wireguard VPN to secure intra-server communications among my 5-6 ubuntu servers sitting in different data centers.
Today, we had a downtime of around 15 minutes because the server running nginx was not able to connect to the web-application server using the wireguard interface [0]. I ascertained that it was not a connection issue between nginx server and web-application server by trying to connect to web-application server via its public IP, which worked [1]. I even tried restarting wireguard service [2] on both nginx and web-application server but to no avail. So, before investigating further, I decided to first route all the traffic to a failover server (which was also a part of the VPN). It took me around 5-10 minutes to pull the latest configuration and application changes onto the failover server and then route all traffic to it. Once our site was up, I again tried connecting to the original web-application server from nginx server, using curl, but this time it worked fine. Can anybody help me understand the problem or anything I should try if it happens again? Please let me know if you need any more information. [0] Tried via curl. curl 10.0.0.10:8080. Received the error 'Connection timed out' [1] curl w.x.y.z:8080 returned the html content as expected. [2] sudo service wg-quick@wg0 restart Regards -- Ashish Madeti
