Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [networking]

The tag has no usage guidance.

-1
votes
1answer
27 views

Accessing container by domain name

hey guys I have a docker container A with a domain name attached to it on a host B with a domain name attached to it as well.....how can I access the said container A via A's domain name rather than ...
1
vote
0answers
23 views

Docker: subnet clients can't ping other subnet

Two containers are created with this Dockerfile: FROM ubuntu:18.04 RUN apt update && apt upgrade -y && apt install -y vim iputils-ping net-tools tcpdump iproute* iptables traceroute ...
-2
votes
2answers
16 views

How to expose a port+url visible to one machine to another [closed]

down vote favorite Essentially I have 3 machines: A, B and C I have access to A and B A can see B (and vice versa) and B can see C (and vice versa). A can't see C (not part of the same network). I ...
0
votes
0answers
11 views

How to filter the ingress traffic to a docker container by changing IPtables in docker host machine

There is an apache server is started in a docker container and it acquires following IP address 172.21.0.3 The gateway IP and prefixlen is as follows 172.21.0.1/16 and the virtual interface attached ...
1
vote
1answer
17 views

phpMyAdmin using dockerised database

I have installed mariadb inside docker container, and mariadb is running properly inside that container. I want to get access of mariadb through phpMyAdmin from outside docker container. What will I ...
0
votes
0answers
103 views

How do I fix a “heartbeat failure” in Docker Swarm?

My cluster is currently located in a single data center. I've been trying to change that by adding a single worker node from another data center, but so far it hasn't worked. I'm able to make this ...
0
votes
0answers
18 views

Can ping service by its DNS x.x.svc.cluster.local but failed pinging by IP

From inside the pod: dig postgres.default.svc.cluster.local ;; QUESTION SECTION: ;postgres.default.svc.cluster.local. IN A ;; ANSWER SECTION: postgres.default.svc.cluster.local. 5 IN A 10.10....
0
votes
0answers
28 views

How to intercept and redirect network communication inside docker containers?

I am fairly new to Docker-compose and have been tinkering around a bit. in the process, i came across a requirement where i need to close down external internet traffic, and redirect requests to ...
0
votes
1answer
39 views

2 IP addresses for one machine, which would allow to expose 2 services on the same port, but on different ip

I am using SoYouStart dedicated server (from OVH family). I bought another ip. I added auto eth0:0 iface eth0:0 inet static address xxx.xxx.20.182 netmask 255.255.255.255 ...
2
votes
1answer
52 views

Docker won't create a bridge network without being given an explicit subnet

The problem The problem is that this happens: $ docker network create alpine4 Error response from daemon: could not find an available, non-overlapping IPv4 address pool among the defaults to assign ...
0
votes
1answer
20 views

pod to pod can not be reached through service clusterIP running in the same minion

few days ago, i am facing a strange issue which is "a pod can not reach another pod running in the same minion/host through servide ClusterIP whereas they can reach each other skipping going through ...
-1
votes
1answer
30 views

Docker hostnames are not resolved in a custom network

I have the following configuration in my docker-composer.yml file. version: '3.3' services: service-1: container_name: 'service-1' build: './service-1' depends_on: - 'mongo' ...
0
votes
0answers
181 views

Enabling Docker containers to connect to Internet from laptop while running only on WiFi

These are the network interfaces I have on my Debian Linux Stretch laptop ~$ ip a 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:...
4
votes
1answer
1k views

Internal network between container Docker Compose with outgoing connection

I am a newbie to Docker. I am trying to run my application containing from multiple containers Here is my docker-compose.yml file version: '3.3' services: php-service: container_name: 'php-...
0
votes
0answers
15 views

Using IPTable to restrict traffic to a Docker container

I've spun up a web server that listens on port 8080 like this: # docker run --rm -p 8080:8080 python:3.6 sh -c "cd tmp && python -m http.server 8080" I want to dynamically adjust iptables ...
0
votes
0answers
17 views

Connect LAN Network to VPN with PiVPN

i am new to computer networking so i thought i could get some practice on my home network. i have 2 raspberry pi's in my lan network, and i am using the free tier EC2 instance from AWS. RPi-1 is ...
0
votes
1answer
219 views

Join a Linux Docker swarm with a local Windows Docker for test purposes

I'm currenlty trying to connect/join a Linux Docker Swarm cluster with my Windows machine in order to test a stack without sending the stack over and over to my test cluster under Linux. My problem is ...
6
votes
2answers
732 views

Why should you do port mapping for docker containers?

I have been using docker for a few months and I am just a developer not a DevOps or a networking person. However, I came across a docker-compose which maps an external port to an internal port. ...
1
vote
2answers
1k views

VPN container providing access to host's LAN?

I'm kinda new to this Docker thing and I'm interested in getting a biffed up VPS for some containers (websites/data, mysql, nginx, rocket.chat, etc) but I wouldn't like to access them in the wild (...
1
vote
0answers
364 views

Understanding Docker swarm networking and ports accessibility on the host

Given the simplest example, the test swarm consists just of one node so all containers run in one place. The stack is setup to run in a custom Docker network; the containers are not directly mapped ...
4
votes
1answer
195 views

Networking between Docker containers

I have a docker container 'A' on a host 10.11.12.13 listening on port 0.0.0.0:8443->8443/tcp I have another container 'B' on same host how wants to talk to 'A' on 8443 via host. Thus when I run ...
4
votes
3answers
138 views

SSH tunneling on steroids

I have a remote redis machine with no ssh and no open ports except to the same lan + a remote machine (on the same lan) with ssh + my pc outside the lan. What I'm trying to do (mostly to see if it's ...
1
vote
1answer
53 views

How to identify the physical IP of where Kubernetes API server runs

Question In a Kubernetes cluster, there is a Docker network IP which looks to be the API server. However, not sure how to identify the physical IP and location of the box in which it is working. If ...
0
votes
1answer
22 views

Dynamic service redirections in Docker

Imagine you have decided to abstract from exact service location. Normally, you have a cody world with the service name=DNS. Say, you have prototyped something with S3 compatible API like exoscale/...
2
votes
0answers
25 views

Weird behavior of the Docker Client on Windows 10 [closed]

There is an - as perceived - unsystematic behaviour of Docker client to setup an IPv6 connection to registry, even if this is disabled in daemon.json. Client error: dial tcp: lookup ******** on [::1]...
1
vote
1answer
447 views

Docker daemon error on joining swarm node - could not find local IP address - unknown port

Consider the following setup: Three hosts in the same network: Host A - SLES Host B - Ubuntu Host C - Ubuntu Then, the following has worked: Init swarm on A Join swarm at B, make B a manager The ...
1
vote
1answer
172 views

Debug Docker DNS

In a stack with higher number of services it seems that Docker DNS does not work anymore which leads to effects that container's names are not known even to themselves. While I have filed this bug, I ...
5
votes
1answer
146 views

How to prevent Azure Traffic Manager from routing over high latency connections in a fail-over scenario?

We have a service hosted in four regions, two in North America and two in Europe. We are using Azure Traffic Manager to provide: Performance-based routing - that is routing consumers to the service ...