Communication between container running in network_mode: host and other containers running on internal network
Sergey Geyhman
Hello,
I'm running Prometheus node_exporter in network_mode=host, the reason is to monitor all NW interfaces.
All other containers (including Prometheus) are running on dedicated NW (net)
the problem - port of node_exporter container is not reachable from other containers
ping from Prometheus container to IP that node_exporter has is working fine
```
ping 172.31.0.1
PING 172.31.0.1 (172.31.0.1): 56 data bytes
64 bytes from 172.31.0.1: seq=0 ttl=64 time=0.086 ms
64 bytes from 172.31.0.1: seq=1 ttl=64 time=0.091 ms
```
when wget is failing
```
wget 172.31.0.1:9194
Connecting to 172.31.0.1:9194 (172.31.0.1:9194)
wget: can't connect to remote host (172.31.0.1): Operation timed out
```
of cause from the host everything is working fine
```
wget 172.31.0.1:9194
--2021-07-28 09:22:14-- http://172.31.0.1:9194/
Connecting to 172.31.0.1:9194... connected.
HTTP request sent, awaiting response... 200 OK
```
Prometheus container interfaces
```
eth0 Link encap:Ethernet HWaddr 02:42:AC:1F:00:02
inet addr:172.31.0.2 Bcast:172.31.0.255 Mask:255.255.255.0
```
Node exporter container interfaces
```
br-1ad4556bf2df Link encap:Ethernet HWaddr 02:42:05:50:9F:FA
inet addr:172.31.0.1 Bcast:172.31.0.255 Mask:255.255.255.0
inet6 addr: fe80::42:5ff:fe50:9ffa/64 Scope:Link
docker0 Link encap:Ethernet HWaddr 02:42:EA:A0:83:0B
inet addr:172.17.0.1 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
ens4 Link encap:Ethernet HWaddr 42:01:0A:84:00:0B
inet addr:10.132.0.11 Bcast:0.0.0.0 Mask:255.255.255.255
```
from docker-compose
```
prometheus_node_exporter:
network_mode: host
command:
- '--web.listen-address=:9194'
..........................
prometheus:
networks:
- net
...............................
networks:
net:
ipam:
driver: default
config:
- subnet: 172.31.0.0/24
```
any ideas?
Ian Billett
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