After running the container, my connection with the server is disconnected

General
1

Hello,
The docker-compose.yml file is as follows:

services:
  banner:
    container_name: Project
    build:
      context: /data/project
      dockerfile: Dockerfile
    ports:
      - "3000:3000"
    environment:
      - PORT=3000
    command: npm start

And the Dockerfile is as follows:

FROM node:latest

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY package*.json ./
RUN npm install --force
COPY . .

EXPOSE 3000
CMD npm start

I am connecting via SSH to the host where Docker is installed. When I run the container, I am disconnected from the host and I have to connect to the host through the virtual machine panel and stop docker. The network settings after disconnection are as follows:

br-0b2663e31b9f: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.21.0.1  netmask 255.255.0.0  broadcast 172.21.255.255
        inet6 fe80::42:5dff:fe70:4496  prefixlen 64  scopeid 0x20<link>
        ether 02:42:5d:70:44:96  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 10  bytes 748 (748.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:2eff:fe78:15ea  prefixlen 64  scopeid 0x20<link>
        ether 02:42:2e:78:15:ea  txqueuelen 0  (Ethernet)
        RX packets 243669  bytes 25181737 (24.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 278149  bytes 420043936 (400.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.2.100  netmask 255.255.0.0  broadcast 172.20.255.255
        inet6 fe80::250:56ff:feb0:7aac  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:b0:7a:ac  txqueuelen 1000  (Ethernet)
        RX packets 47249392  bytes 9400289575 (8.7 GiB)
        RX errors 0  dropped 2568  overruns 0  frame 0
        TX packets 4730307  bytes 1743732975 (1.6 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 4043294  bytes 7918521674 (7.3 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4043294  bytes 7918521674 (7.3 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

What is wrong?

Thank you.

2

It seems your LAN connection (ens192) suddenly has a private IP (172.20.2.100).

Not sure how that can happen, it shouldn’t be directly related to that container.

Did you mess with Docker config, network or firewall settings on host?

3

Hello,
Thank you so much for your reply.
The 172.20.2.100 is the IP address of the host NIC.