On my host Ubuntu 18.04 I am running two lxc containers using default setups. Containers use Ubuntu 18.04 as well. I have an app running on container1 that offers an https based service on https://localhost:3000/. Container2 is not able to even establish a connection with container1.
Container2 can ping container1 and read the html of the default Apache2 server running on localhost (for container1). Testing with netcat, I can establish connection with a few main ports, however I get connection refused for port 3000.
root@c2:~# nc -zv c1 22
Connection to c1 22 port [tcp/ssh] succeeded!
root@c2:~# nc -zv c1 80
Connection to c1 80 port [tcp/http] succeeded!
root@c2:~# nc -zv c1 443
nc: connect to c1 port 443 (tcp) failed: Connection refused
nc: connect to c1 port 443 (tcp) failed: Connection refused
root@c2:~# nc -zv c1 3000
nc: connect to c1 port 3000 (tcp) failed: Connection refused
nc: connect to c1 port 3000 (tcp) failed: Connection refused
The same situation applies between my host and any of my containers. Only ports 22 and 80 seem to be reachable by default. I tried enabling ufw on all containers, but it still doesnt work out:
root@c1:~# ufw status
Status: active
To Action From
-- ------ ----
OpenSSH ALLOW Anywhere
22/tcp ALLOW Anywhere
22 ALLOW Anywhere
443 ALLOW Anywhere
873 ALLOW Anywhere
3000 ALLOW Anywhere
Anywhere on eth0@if16 ALLOW Anywhere
Apache ALLOW Anywhere
80 ALLOW Anywhere
20 ALLOW Anywhere
OpenSSH (v6) ALLOW Anywhere (v6)
22/tcp (v6) ALLOW Anywhere (v6)
22 (v6) ALLOW Anywhere (v6)
443 (v6) ALLOW Anywhere (v6)
873 (v6) ALLOW Anywhere (v6)
3000 (v6) ALLOW Anywhere (v6)
Anywhere (v6) on eth0@if16 ALLOW Anywhere (v6)
Apache (v6) ALLOW Anywhere (v6)
80 (v6) ALLOW Anywhere (v6)
20 (v6) ALLOW Anywhere (v6)
Anywhere ALLOW OUT Anywhere on eth0@if16
Anywhere (v6) ALLOW OUT Anywhere (v6) on eth0@if16
Even testing via curl clearly shows me that port connection is closed and thats the issue:
root@c2:~# curl https://10.155.120.175:3000/
curl: (7) Failed to connect to 10.155.120.175 port 3000: Connection refused
I have been stuck in this issue for a week, can anyone help me troubleshoot this?
