balancer-config-2

client_max_body_size 1280M;

upstream mainnet_rpc {
    least_conn;
    server rpc-eth2.node.com:7999 max_fails=3 fail_timeout=2s weight=1;
    server rpc-eth1.node.com:7999 max_fails=3 fail_timeout=2s weight=1;
}

server {

  listen 127.0.0.1:7999;
  server_name localhost;
  access_log /var/log/nginx/loadbalancer.log;

  client_max_body_size 1280M;

    location / {
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection "upgrade";
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   Host $http_host;
        proxy_set_header   X-NginX-Proxy true;
        proxy_pass         http://mainnet_rpc/;
    }

}

EthNODE+ngnix

########ETH-NODE########
apt-get update; \
apt-get upgrade -y; \
apt-get install nginx -y; \
rm /etc/nginx/sites-enabled/*; \
nano /etc/nginx/sites-enabled/ether.conf

#Туда вот это ничего не меняя.

/начало файла

client_max_body_size 1280M;

upstream eth_rpc {
    server 127.0.0.1:8545;
}
upstream eth_ws {
    server 127.0.0.1:8546;
}

server {

  listen 7999;
  listen [::]:7999;
  server_name localhost;
  access_log off;

  client_max_body_size 1280M;

  location ^~ /secrettokenrpc {
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;
      proxy_pass       http://eth_ws;
  }

  location ^~ /secrettokenrpc {
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;
      proxy_pass       http://eth_rpc/;
  }
}

/конец файла

# change the worker connections
nano /etc/nginx/nginx.conf

events {
        worker_connections 4096;
        multi_accept on;
}


systemctl daemon-reload; \
systemctl start nginx; \
systemctl enable nginx; \
systemctl restart nginx

Check
curl http://IP_ETH_SERVERA/rpc
Answer
Used HTTP Method is not allowed. POST or OPTIONS is required

Ok!
Firewall

iptables -A INPUT -s IP_GRAPH_SERVER -j RETURN
iptables -A INPUT -p tcp --dport 80 -j DROP
or 
ufw allow from IP_GRAPH_SERVER to any port 80

##############################################################################################################
# Optional Тут нода эфира не лезет в локалку.
# ETH.SERVICE

nano /etc/systemd/system/openethereum.service

/начало файла

[Unit]
Description=OpenEthereum
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/usr/bin/openethereum \
        --no-periodic-snapshot \
        --pruning=archive \
        --tracing=on \
        --no-warp \
        --db-compaction=ssd \
        --cache-size=100000 \
        --max-peers=64 \
        --jsonrpc-threads=8 \
        --jsonrpc-server-threads=100 \
        --jsonrpc-hosts=all \
        --jsonrpc-cors=all \
        --allow-ips=public \
        --ws-origins=all \
        --ws-hosts=all
User=root
Group=root
Restart=on-failure

# Specifies which signal to use when killing a service. Defaults to SIGTERM.
# SIGHUP gives openethereum time to exit cleanly before SIGKILL (default 90s)
KillSignal=SIGHUP

[Install]
WantedBy=default.target

/конец файла


##############################################################################################################
### далее на ноду с графом###

И тут вот наша стартовая строка... Доступ вида http://IP_NODE_ETH/rpc

cargo run -p graph-node --release -- \
  --postgres-url postgresql://postgres:xxx@localhost:5432/graph-node \
  --ethereum-rpc mainnet:http://IP_NODE_ETH/rpc \
  --ipfs https://testnet.thegraph.com/ipfs/
  
##############################################################################################################
# balancer
# 1) install nginx (instructions above)

nano /etc/nginx/sites-enabled/ether.conf

# file begin
upstream eth {
    server 1.1.1.1:8080;
    server 2.2.2.2:8080;
}

server {

    listen 127.0.0.1:7999;
    server_name localhost;
    access_log /var/log/nginx/loadbalancer.log;

    location / {
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection "upgrade";
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   Host $http_host;
        proxy_set_header   X-NginX-Proxy true;
        proxy_pass         http://eth;
    }
}

#file end

#test config
nginx -t

sudo systemctl daemon-reload; \
sudo systemctl start nginx; \
sudo systemctl status nginx; \
sudo systemctl enable nginx; \
sudo systemctl restart nginx