Question

I cannot seem to connect via private ip address between 2 droplets

Posted on August 29, 2018
MySQL Ubuntu 16.04 Networking
Asked by dpp777

I have 2 droplets, same data center behind the same fire wall. I have enabled private networking. My end goal is to have a web application on droplet 1 and mysql database on droplet 2 and connect the two via private network IP over port 3306. However, I cannot ping from droplet 1 to droplet 2 using the private ip address. I’m not sure what i’m doing wrong. Ports 22,80,443 are open on the firewall. Ubuntu 16.

Thank you!

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jarland

DigitalOcean Employee

• August 29, 2018

Accepted Answer

Hey friend!

Most often when receiving reports of this, the case is that at least one droplet has had private networking enabled after it’s creation, but it has not been set up yet in the operating system. If that might be the case for you, try these instructions:

https://www.digitalocean.com/docs/networking/private-networking/how-to/enable/#manual

You will also want to make sure that the droplets are both on the same account, as private networking will be limited in communication to droplets on that same account.

Jarland

mfnx • May 26, 2020

In case this helps, additionally to correctly enabling VPC on your droplets (if unable, you can always destroy them and recreate them with the VPC option), I had trouble signing in from one droplet to another over ssh. I got a public key error. To solve that, I did the following:

Assuming you want to ssh with user myuser, make sure your .ssh folder is owned by myuser and belongs to group myuser:

sudo chown myuser ~/.ssh sudo chgrp myuser ~/.ssh

and the same for authorized_keys and other files in .ssh.

In droplet1, create a config file in .ssh with:

Host droplet2 (or whatever you want) Hostname <ip_droplet_2> User myuser IdentityFile <path_private_key>

And you can do the same on droplet2, setting the connection data for droplet1.

The IdentityFile finally made it work.

snidhidev • October 30, 2019

For future readers of this thread: Also, if a DO Cloud-firewall has been setup for the target droplet, the firewall must be open to ICMP protocol for Ping to work.