I'm using the nginx:alpine Docker image, running it like so:
c@makina ~> docker run -itp 8000:80 nginx:alpine
The port is shown as listening in lsof:
c@makina ~> sudo lsof -i :8000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 3653 root 4u IPv4 2025067 0t0 TCP *:8000 (LISTEN)
However, when trying to access it, I get a connection timeout:
c@makina ~> http :8000
http: error: Request timed out (30s).
Starting another container with a link to the nginx container lets me access it, however:
c@makina ~> docker run -it --link ${CONTAINER_ID}:nginx alpine:3.6 /bin/sh
/ # curl -s -D - -o /dev/null http://nginx/
HTTP/1.1 200 OK
...
The docker0 bridge (and the br-* bridge and veth* interfaces) are up on the host, and both lo and eth0 are up in the nginx container.
The firewall is disabled on the host:
root@makina /h/c# service iptables status
* status: stopped
Any ideas?
I figured out the issue was that the loopback interface was not up. Adding it to /etc/network/interfaces and running ifup lo fixed the issue.