Questions tagged [networking]

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Can't connect to Windows VM via RDP after making IP static

I'm trying to set-up a Windows load injector VM in Azure with multiple IP addresses. In order to assign multiple IP addresses, you must assign a static IP address and switch off DHCP. However, when ...
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15 views

Use pod's IP from a different node than the pod is running

Can I access the pod using its ip address from a different node (not the one the pod is running)? I'm not talking about using Service resources, but using the pod ip (Pod.status.podIP).
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2answers
81 views

Reaching a Docker environment running in VMware from LAN

Here is my setup: I have a Ubuntu 20.04.2 LTS machine running in VMware (vSphere client). On this machine, I have a local Drupal website running in Docker using Wodby Docker4Drupal https://github.com/...
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14 views

How to Disable Outbound Access Connection on RHEL 7.8

I am using a RHEL 7.8 OS. This instance contains outbound access. Is it possible to disable internet connetion using command line?
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2answers
28 views

Limit throughput between Jenkins and Jenkins Agent

I am trying to find a way to throttle the thruput on the request of our Network folks. They want me to not exceed 5.5Mb/sec. Is there a way to do this within Jenkins. Looking at the config files under ...
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2answers
27 views

Service to service communication - through proxy or direct?

A common scenario is two or more services behind a reverse proxy, typically each deployed in a container: | service 1 | | service 2 | \ / \ / ...
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15 views

Kubernetes workers outside the SDDC cloud not connect to the masters

Please help us with the following problem: We are using calico from https://docs.projectcalico.org/manifests/calico.yaml to setup Kubernetes network on SDDC cloud. The masters are inside the cloud, ...
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1answer
53 views

How to create a local network mapping in linux

I'm deploying nextcloud via docker, however the way the configuration is set up, it creates a subnetwork at 10.10.10.0/24 on the system it's running on instead of running it on 127.0.0.1. Then the ...
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21 views

How to make sure K8S nodes only communicate via private network

I have the following setup: master and worker node are connected via eth0 to the internet and via enp7s0 to a local newtork (IP's 10.0.0.2 and 10.0.0.3). I have installed K8S with flannel as ...
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34 views

How to make docker look for a port on another machine?

I have a docker containing AMQP(an open-source message broker). The docker-compose file is : services: mom: image: vromero/activemq-artemis:2.15.0-alpine restart: unless-stopped ports: ...
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1answer
25 views

AWS Inspector “High Risk” : port open to the internet with IP whitelisting

We use AWS Inspector to identify risks with our AWS assets. Today I received a finding, with a "high" severity. The finding said that the FTP port was open to the internet. However, after ...
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1answer
96 views

Isolate service networks with Docker Compose

I have two containerised services, A and B, with which I wish to isolate network communications with docker compose. There is also a shared service C which is not isolated from A or B and is free to ...
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1answer
95 views

Cannot resolve services with service name inside a kubernetes pod

I cannot access a pod from another pod with its service name. Getting error as cannot resolve host svcname When i try to view the information of /etc/resolv.conf, i do see ec2.internal as searches ...
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30 views

Integration testing of multiple containers via docker in docker

About a year ago we set up a gitlab-pipeline to integration-test a bunch of interacting containers. The whole test is steered from a pytest based script which starts/stops individual containers and ...
3
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1answer
75 views

K8s cluster in peered VPC can't reach RDS cluster

I have two K8s clusters in the same VPC that I want to connect to an MySQL Aurora RDS cluster. One of the clusters can reach the RDS cluster just fine. The other, however, cannot. I'll call these eks-...
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0answers
15 views

docker kali linux container: wireless card is seen as eth0

So, I installed kali linux with command: docker pull kalilinux/kali-rolling Then I installed net-tools to do ifconfig. ifconfig shows eth0, lo (loopback), but no wifi card. Why docker sees my wifi ...
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14 views

How to troubleshoot Pod-to-Pod communication cross nodes?

Prerequisite: I use VirtualBox to setup 2 VMs. VirtualBox version is 6.1.16 r140961 (Qt5.6.2). The OS is CentOS-7(CentOS-7-x86_64-Minimal-2003.iso). One VM as kubernetes master node, named k8s-...
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44 views

Private EKS behind corporate Proxy - with Terraform

I have built a private EKS cluster, im now going through the motions of trying to attach a Managed Node group to the cluster using Terraform. Looking through lots of resource the Node group required ...
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1answer
19 views

iptables rules to permit GitHub Actions from breaking (chains default to DROP)

Assuming my iptables rules default to DROP on the INPUT and OUTPUT chains, what is the bare minimum set of rules that I must add to my chains to prevent a script running in GitHub Actions from ...
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12 views

Can I connect a PC/Mobile from my house and be able to see/connect WiFi networks around the PC/Mobile?

I’m not sure if it’s the exact place so lemme know if I need to move it, my question is this, Can I connect a PC/mobile lets say in location 1 with my PC and see the WiFi networks in location 2 of PC/...
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0answers
31 views

How to execute a “hello redis” sample python script on a container from the host?

How do I execute this "Hello Redis!!!" sample from the host? root@mordor:~# root@mordor:~# docker container ls CONTAINER ID IMAGE COMMAND CREATED ...
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1answer
33 views

why is “docker run” used to connect to redis?

Trying to understand what's happening here: root@mordor:~# root@mordor:~# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS ...
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18 views

Topology and configuration of MySQL client and server containers

Perhaps I'm using MySQL in an unusual way. I was thinking of just having alice and bob containers, where the console client is used on one to query the other. I'm probably using MySQL in an obscure ...
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90 views

Is the MySQL Command-Line Client on alpine or another minimalist container?

This seems not wholly unreasonable: root $ root $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES root $ root $...
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1answer
781 views

how to connect to a MySQL database in a docker container?

starting up the default mysql server: root $ root $ docker run --name mysql -d -p 3306:3306 -e MYSQL_ROOT_PASSWORD=password mysql/mysql-server:latest ...
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2answers
156 views

How do I make a redis container accessible through bridge networking from the host?

I'd like to be able to connect directly to the redis container below: root $ root $ docker images redis REPOSITORY TAG IMAGE ID CREATED SIZE redis ...
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1answer
1k views

docker-compose up: Error starting userland proxy: listen tcp 0.0.0.0:443: bind: address already in use

specific error: ERROR: for traefik Cannot start service traefik: driver failed programming external connectivity on endpoint frappe_docker_traefik_1 (...
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1answer
39 views

How can I access port 80 of another container, when port 80 is already exposed?

I have a docker file that runs some integration tests between two containers. It looks a bit like this: version: '3' services: test_client: image: client:latest depends_on: ...
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2answers
109 views

Minecraft docker-container refuses connection

So I have this Dockerfile: FROM openjdk:8u212-jre-alpine LABEL maintainer "cowboy_patrick" RUN apk add --no-cache -U \ openssl \ imagemagick \ lsof \ su-exec \ shadow \ bash \ ...
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2answers
215 views

How to Save and Restore the Iptables rule and configuration from file?

I want to save the current iptables configuration to a file and restore it from a file. I have a lot of rules and modifying the rules really hard for me. So, how can i do that?!
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1answer
40 views

Sending HTTP requests to private EC2 DNS from other EC2 host works, but not from container on EC2 host

I want to make a container hosted on one EC2 host communicate with another container hosted on another EC2 host. Currently, if I send an HTTP request from host A to host B using host B's private DNS ...
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1answer
30 views

How to create a second IP just for dockers

Problem: my server is already using port 80 and I would like launch another service that uses port 80 on another address (I don't want to remember ports or force my wife to use non-default ports). I'...
2
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1answer
36 views

Why I cannot access k3s service from pod in rasbian?

I have installed K3S kubernetes on rasbian, and created a following mysql deployment on it: apiVersion: v1 kind: PersistentVolumeClaim metadata: name: mysql-data spec: accessModes: - ...
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0answers
48 views

Can't set up basic k3s cluster on raspberry pi setup

I apologize in advance if this is trivial as I am an undergrad and quite new to kubernetes, raspberry pis, and networking in general. I only included the fact I am working on Raspberry Pi for ...
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1answer
144 views

Blacklist network ranges Docker is allowed to use for its containers (swarm mode)

Basically I need to blacklist an IP range (and maybe multiple ranges) so that Docker can use any other IPs for its containers BUT IPs in this range. Assume I have my docker nodes in a swarm of n ...
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1answer
50 views

How do I setup an OpenShift route that will allow both 80 and 443 traffic to my app?

I'd like to setup a route that will pass both 80 and 443 traffic to the same service in OpenShift. When I try to create a second route it errors out. I want this to be in a yaml like would be used ...
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1answer
75 views

Mapping Outbound IPs to 1 IP in Azure App Services

I have 3 components of my architecture running in 3 separate Azure App Services. Each app service has 4 outbound IPs. So whenever I have to deploy my app onto the client's premise, I have to whitelist ...
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2answers
164 views

Does Kubernetes internal networking keep traffic to co-located Pods where possible?

In Kubernetes, if I run a Service Foo on every Node, and also Service Bar on every Node, i.e. with DaemonSets. If a Pod from Service Foo needs to make a request to Service Bar, does Kubernetes ...
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1answer
40 views

Kubernetes: How to expose a Pod/Deployment to the Nodes Network

Ok, let's assume I've got the following theoretical setup: I want to somehow assign IP-Addresses accessible by the PCs on the left to my pods. I can set routes etc. as I need since this setup is ...
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2answers
205 views

localhost Pod to Pod communication k8s

I am trying to transfer an old legacy system to k8s. I have a custom server that client apps connect to in order to communicate with one another. Both the server and clients were originally created ...
2
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0answers
20 views

Connecting to MySQL Remotely on Azure VM

I am having trouble connecting remotely to my MySql install that runs on an Azure VM. Here is what I did: Ubuntu VM with MySql 5.7 installed Bind Address set to 0.0.0.0 User granted rights with ...
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1answer
382 views

How to connect to postgres container from a node container using docker-compose?

I'm trying to connect from a node app container to a postgresql container using docker-compose but I'm not able to do it. This is my docker-compose.yml file: version: '3.7' services: db: image: ...
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1answer
305 views

Kubelet config file — > clusterDNS

clusterDNS: - "10.32.0.10" The above is a flag passed to the kubelet file, i dont know what it refers to clsuter DNS ? Is it refers to VPC CIDR or any subnet CIDR ?
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1answer
1k views

Bridged network adapter for Packer + VirtualBox?

So, I load an .ova image with packer of a minimal ubuntu linux installation. I realized after everything went through (Provisioners etc) and it successfully exported the output file. However, when ...
2
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1answer
149 views

Check connectivity of 5000 + servers from ansible and get list of hosts which are connectable and which are not

I need to check connectivity of hosts on port 43. I can manually login and check connectivity by: nc -v `hostname` 43 nc -v `hostname_1` 43 Is there any ansible script that goes through all the ...
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1answer
45 views

Docker container and their IPs on overlay (swarm) networks

I have a Docker overlay network which includes 2 containers and the loadbalancer for this network: "Containers": { "0ece6b958aa6b451478b5004ba1b1681ec91b718b99a0c2c88b79d5e8e135a66": { ...
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1answer
249 views

Docker bridge network Configuration for containers

I have an Angular application deployed in the container . If I log in to the container I can curl to the port 4200. I have mapped to port 9001 to connect from my host . But I can't curl from my host ...
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1answer
413 views

IOS_Command Module - Delayed Prompt Issue (Cisco 3850 - IOS XE)

I'm new to the Ansible world, so I'll do my best to explain everything. If I leave something out or need to clarify, just let me know. So, I've been working on upgrades for various Cisco switches/...
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1answer
378 views

aws - Connect two private subnets?

I'm testing some cloudformation infrastructure templates, and I noticed that most of the examples include routing tables to connect private subnets to public subnets, but my question then is: if two ...
1
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1answer
139 views

How to perform low-level inspecting of a Docker network traffic?

I'm currently in a scenario that requires Docker container C to be able to intercept communication between docker containers A and B, without their knowledge. I am basically attempting to do a ...