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Questions tagged [networking]

The tag has no usage guidance.

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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
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0answers
10 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....
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0answers
20 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 ...
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1answer
35 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 ...
1
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1answer
39 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
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1answer
17 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
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1answer
28 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' ...
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0answers
118 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:...
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1answer
515 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-...
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0answers
13 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 ...
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0answers
16 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
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1answer
167 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 ...
5
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2answers
389 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. ...
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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 (...
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0answers
268 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
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1answer
169 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 ...
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3answers
119 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 ...
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0answers
42 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
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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
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0answers
24 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
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1answer
386 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
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1answer
147 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
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1answer
129 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 ...