Questions tagged [networking]
The networking tag has no usage guidance.
79
questions
6
votes
2answers
102 views
Securing communication between cloud VMs without private networks. Any strategy besides building own VPN? Spiped?
I am working on an application that requires a number of different services (web application + database + worker queues, XMPP server for messaging, redis, central authentication via LDAP, etc). For my ...
1
vote
1answer
5k views
External access to internet from Kubernetes Pods
I'm having troubles with network access from pods. I had installed new Kubernetes cluster with flannel-network plugin,
Checking the health of server - good.
I tried to check network via busybox: ...
0
votes
1answer
33 views
Dockerized MySql slower in Wifi than ethernet
When I try to connect to a MySQL server that runs in a docker container(in System A) through my application(Running in system B) via wifi, it takes at least 4X amount of time than it would when both ...
1
vote
1answer
30 views
How to attach two (or more) networks to a container so they are available when the container starts?
I noticed if you try to attach a container to two networks, the following syntax does not cause an error, but effectively attach the container only on the network specified by the last --network:
...
1
vote
1answer
22 views
What are the benefits of spreading the various services of a multi-tiers application over several user-define bridges?
I have a simple system made of a database backend, several instances of a web application and a load balancer. Each service is running in its own Docker container, all of them being hosted on the same ...
0
votes
1answer
228 views
container on same network with host
Our application is a combination of 4 different applications. The graphics part is running on a host and other 3 applications are running on 3 different VMs. Which uses bridge networking.
eg. ...
11
votes
6answers
22k views
How to get kubernetes pod network CIDR
I have a running k8s cluster initialized with kubeadm.
On initialization, I did not pass the option --pod-network-cidr
How do I get the CIDR of the pod network
I tried
Looking at the /etc/...
0
votes
1answer
63 views
call container B inside container A using docker networks
I have two docker containers A and B that runs on the same user-defined network.
Container A has a port published, container B hasnt.
I do my requests on container's A published port, but container A ...
-1
votes
1answer
520 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 ...
2
votes
1answer
296 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
1answer
97 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 ...
4
votes
1answer
3k views
How to 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 ...
2
votes
2answers
927 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
58 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 ...
-2
votes
1answer
407 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'
...
6
votes
1answer
12k 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-...
1
vote
0answers
247 views
Using IPTable to restrict traffic to a Docker container [closed]
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 ...
2
votes
2answers
1k 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
6k 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. ...
3
votes
2answers
7k 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
712 views
Understanding Docker swarm networking and ports accessibility on the host [closed]
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 ...
6
votes
1answer
886 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 ...
3
votes
3answers
314 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
792 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
29 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
27 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
1k 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 ...
2
votes
1answer
543 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
412 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 ...
