ktor-deploy-steps.txt

1. Download Git Bash (only if on Windows)

2. Go to your users folder and open the .ssh folder. Then open Git Bash / Terminal there and generate a key pair:
ssh-keygen -m PEM -t rsa

3. Copy the key to your server:
ssh-copy-id -i <keyname> <user>@<host>

5. Login to your Ubuntu server via SSH:
ssh -i <keyname> <user>@<host>

6. Update dependencies:
sudo apt update

7. Install Java:
sudo apt-get install default-jdk

8. Open /etc/ssh/sshd_config:
sudo nano /etc/ssh/sshd_config

9. Put this string in there, save with Ctrl+S and exit with Ctrl+X:
KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1

10. Restart the sshd service:
sudo systemctl restart sshd

11. Create a systemd service for your Ktor server:
sudo nano /etc/systemd/system/jwtauth.service

12. Paste this configuration in this service, then save with Ctrl+S and exit with Ctrl+X:
[Unit]
Description=Auth Service
After=network.target
StartLimitIntervalSec=10
StartLimitBurst=5

[Service]
Type=simple
Restart=always
RestartSec=1
User=root
EnvironmentFile=/etc/environment
ExecStart=/usr/lib/jvm/default-java/bin/java  -jar /root/jwtauth/jwtauth.jar

[Install]
WantedBy=multi-user.target

13. Launch the service:
sudo systemctl start jwtauth

14. Create a symlink to automatically launch the service on boot up:
sudo systemctl enable jwtauth

15. Make sure, your ports are open and you forward the traffic from the standard HTTP port to 8080:
iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 8080 -j ACCEPT

16. Then, save your iptables rules:
sudo apt-get install iptables-persistent

17. Add JWT_SECRET=<your-secret> and MONGO_PW=<your-mongo-db-pw> to your environment variables
sudo nano /etc/environment