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These instructions are to allow Julius to connect to a postgres database on a private network. We are using a debian VM, but the tools used are available for other distributions, and you may just need to change the installation commands. For other databases only a port number change would be necessary.
  1. Spin up an instance that has a public ip, and can talk to the internal database.
  2. SSH into the instance, and verify that you can connect to the database, for postgres 
    sudo apt install postgresql-client
psql postgresql://[postgres user]@[postgres ip]:[postgres port]
# enter the postgres password when prompted
  3. Install HA Proxy 
    sudo apt install haproxy
  4. Add haproxy config to proxy postgres, change DB IP/HOSTNAME to the IP/HOSTNAME of your db, replace /etc/haproxy/haproxy.cfg with the following 
    global
    daemon
    log stdout local0
    chroot /var/lib/haproxy
    stats socket /run/haproxy/admin.sock mode 660 level admin
    stats timeout 30s
    user haproxy
    group haproxy

defaults
    mode tcp
    log global
    option tcplog
    option dontlognull
    retries 3
    timeout queue 1m
    timeout connect 10s
    timeout client 1m
    timeout server 1m
    timeout check 10s

# Frontend - listens on port 5432
frontend postgres_frontend
    bind *:5432
    mode tcp
    default_backend postgres_backend

# Backend - forwards to your database server
backend postgres_backend
    mode tcp
    balance roundrobin
    option tcp-check
    tcp-check connect
    server db1 [DB IP/HOSTNAME]:5432 check
  5. Enable and start haproxy 
    sudo systemctl enable haproxy
sudo systemctl start haproxy
    1. Add a security rule that allows incoming traffic on port 5432 from the Julius IPs, you can view the IPs at the bottom of the page here: <https://julius.ai/data-connectors\>
  7. Try connecting Julius to the public ip of your bastion, it should proxy to your database and let you connect now.