guilospanck/dota2-counters-backend

Backend hosted on an EC2 Amazon instance to serve as backend to the react native application Dota2CountersReactNative.

Dota 2 Counters - Backend

Backend hosted on an EC2 Amazon instance to serve as backend to the react native application Dota2CountersReactNative.

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Some configurations to remember

FOR NODE APPLICATIONS YOU'LL NEED PM2:

1. Install PM2 on your server

npm install pm2@latest -g

➡️ PM2 it's a package that is going to run the process in the background.

2. Go to your server.js folder and run

pm2 start server.js

➡️ If you have problems and need to add node params, you can do something like:

pm2 start server.js --node-args="--max-http-header-size=16384"

Other configs to pm2:

pm2 status
pm2 restart {index}

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TO FORWARD PORTS IN UBUNTU:

1. cat /proc/sys/net/ipv4/ip_forward ➡️ verify if port forwarding is enabled (1: enabled, 0: disabled)
2. if disabled (0), then:
   • sudo nano /etc/sysctl.conf
   • uncomment the following line: net.ipv4.ip_forward
   • sudo sysctl -p /etc/sysctl.conf (to enable changes)
3. cat /proc/sys/net/ipv4/ip_forward ➡️ verify if port forwarding is enabled (1: enabled, 0: disabled)
4. set port forwarding:

sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport {PORT_OF_YOUR_INSTANCE} -j REDIRECT --to-port {PORT_OF_YOUR_SERVER_APPLICATION}

For e.g.:

sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080

where: - {PORT_OF_YOUR_INSTANCE} is the port opened on your machine (usually 80, 443, 22 ...) - {PORT_OF_YOUR_SERVER_APPLICATION} is the port that you're listening on your application (on server.js for node) 5) Now open your firewall to that port

sudo iptables -A INPUT -p tcp -m tcp --sport {PORT_OF_YOUR_INSTANCE} -j ACCEPT

For e.g.:

sudo iptables -A INPUT -p tcp -m tcp --sport 80 -j ACCEPT)

And:

sudo iptables -A OUTPUT -p tcp -m tcp --dport {PORT_OF_YOUR_INSTANCE} -j ACCEPT

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TO SET CRONTAB:

1. Enable cron: sudo systemctl enable cron
2. Type crontab -e and then enter
3. select nano as your editor (usually option 1)
4. Set your crontab service (go to cron guru for examples)

30 03 * * * python3 /home/ubuntu/dota2cp/dotabuff_scrapper.py

It'll run dotabuff_scrapper.py everyday at 03:30am.

➡️ (don't forget the "/" before the path in "/home...", otherwise will not work)

➡️ (always test before, in other words, test on the terminal: python3 /home/ubuntu/dota2cp/dotabuff_scrapper.py)