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Questions tagged [containers]

Use for generic questions on containers that do not fall under a specific container technology, like Docker, LXC, FreeBSD Jails, OpenBSD sysjails, Solaris Containers, WPARs, etc. Also use where the specific technology is not relevant to the question.

0
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1answer
9 views

Is Podman related to Moby codebase?

Afaik Docker builds on a community codebase Moby. So it was to expect "other Dockers" might come though I have no examples so far. Is now Podman another Moby based product?
1
vote
0answers
33 views

How to automate a work-flow in the cloud?

I'm currently trying to scale a crawler in the cloud. I'm wondering what would be the best way to automate the work-flow, considering the following conditions: - Guaranteed bandwidth, CPU and memory ...
0
votes
1answer
30 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. ...
0
votes
0answers
9 views

PiHole on LXC, forwarding port 53

So, I'm trying to install PiHole on an LXC container, on a remote server. However it's not resolving my queries. Here are things which I'm sure of: PiHole has been installed successfully. It is able ...
3
votes
1answer
23 views

Docker Persisting Data During Build

I am trying to create a custom container which also contains MongoDB (hence not using the official MongoDB container). I am trying to add authentication to the database, and I think I am having an ...
0
votes
0answers
21 views

running httpd and nginx in the same pod kubernetes

I am not able to run both apache (httpd) and nginx in the same pod. Indeed both containers are running on port 80. # kubectl logs -f multi-container -c apache (98)Address in use: AH00072: make_sock: ...
1
vote
1answer
26 views

Containers Orchestations and some docker functions

I am familiarizing with the architecture and practices to package, build and deploy software or unless, small pieces of software. If suddenly I am mixing concepts with specific tools (sometimes is ...
0
votes
0answers
11 views

Permission issue with Persistent volume in postgres in Kubernetes

I know this question has been asked repeatedly but not fully answered. I have a postgres running in as root user in a container which is using the persistent volume. But it seems like there is ...
0
votes
2answers
32 views

How to get exposed ports from inside of container?

I want to know which port(s) are exposed when user run the image. docker run -p 1000:1234 myimagename I want to get 1234 value in container since I will use it for some configurations(IIS bindings ...
3
votes
1answer
84 views

How to handle large deployments using tools like gitlab and docker

How to deploy multiple instances (40+) of the same application with gitlab? (it is a simple tomcat web app) I want to be able to individually upgrade/downgrade them using web interface. We already ...
2
votes
0answers
38 views

How to deploy large web app in container minimal data transfer?

In current deployment of a web app we are using svn to deploy a specific revision from a repository. The amount of data transferred is just the diff between the currently deployed revision and the ...
0
votes
2answers
15 views

Create clean/blank MacOS fs on MacOS or Linux

In developing/testing OSS libraries I can replicate a clean Linux fs using containers. However, if I want to test oss libs for MacOS end users, I seem to be in a bit of a quandary. Is there any way to ...
2
votes
1answer
23 views

Docker Deployment strategy for microservices project

i am new to the ops side of devops and was hoping for some clarification. Specifically, if in a microservice based project you have multiple jars and each jar gets deployed in a VM on the same ...
-1
votes
1answer
33 views

Maximally-self-managed hosting-platforms and OS-and-above containerizators (like Vagrant)

A maximally-self-managed hosting-platform like DigitalOcean/Linode lets a customer quickly create its own VPSE (Virtual Private Server Environment) which includes a common FOSS operating system like ...
3
votes
2answers
28 views

Cross region replication of Redis Docker container data

I am looking for some help with figuring out a way to take a Redis Docker image and then do near real time replication of the data to another server maybe over an SSH tunnnel. I need this to be able ...
2
votes
0answers
46 views

ECS ELB Health Check Fails

The health check on our ECS cluster is failing on a service that is using an ELB Network Load Balancer on TCP port (gRPC running in docker alpine). The service is using dynamic port mapping for ...
0
votes
0answers
30 views

Not able to install Docker CE 17.x or 18.x on RHEL Linux

I am trying to install docker latest version using the below curl commands: $ curl -fsSL get.docker.com -o get-docker.sh $ sh get-docker.sh But this script is not working for my RHEL 7.x Error : ...
1
vote
1answer
75 views

Error during setup of clairctl for container scanning with clair

I am trying to setup clairctl to scan our application images and so wanted to install the full stack of clairctl, clair scanner & postgress database. I did the following steps: Acquired a VM ...
3
votes
4answers
174 views

DevOps tools and automation of manual processes

This is a general question, but couldn't find a better place to ask. I'm a new DevOps member in a company, and I've been ask to "update" our DevOps technologies. Generally speaking, in what areas do ...
1
vote
2answers
45 views

Automated tag versioning on unchanged docker images

I am starting to use Continuous Integration on my microservices solution (monorepo approach), and I am referencing this post for versioning approach. But, let's say I make some change in one of the ...
2
votes
1answer
197 views

How to assign static ip in docker for Windows for linux container?

I want to assign static ip to my docker container in docker for Window for linux container. I have achieved same in linux container using macvlan but macvlan doesn't support for docker for Windows. ...
1
vote
2answers
50 views

Scheduling a Docker Container or Installing Scheduler in Container

I have an interesting question related to scheduling my Docker Container. I have a virtual machine with a docker image inside of it. I can spin up a container from the image that has an entrypoint (...
2
votes
2answers
47 views

Getting data from crashed docker container

I am having docker container with Ubuntu installed which was running with Nvidia docker But now I connected that HDD in a different computer. Now After typing following command in newly assembled ...
0
votes
0answers
16 views

How to filter out system-generated calls in monitoring of Azure Webapps?

My setup is as follows: I have an Azure WebApp for containers, where one of the setting is 'Always On', which means that Azure sends a call periodically to keep the container instance/VM warmed up. ...
0
votes
0answers
22 views

How to detect exception occured in a Pod in Kubernetes?

I have a multinode kubernetes cluster. Multiple services are deployed as Pods. They communicate over each other via rabbitmq which also exists as Pod in the Cluster. Problem Scenario: Many time ...
1
vote
1answer
24 views

In a Database Per Service model - should i include the database in the service container?

I am implementing a simple setup with two micro services and would like each of them to have their own DB - each service is running in it's own container. Should i include the DB's in each service ...
1
vote
0answers
68 views

KATA vs NABLA Containers Isolation

I am struggling with retrieving the difference between : KATA and IBM NABLA. Or better, what is the added value of the one over the other? Both come with enhancement of containers isolation: ...
1
vote
2answers
51 views

Can a cross platform app be run as a container on both Linux and windows hosts?

I have read (and seen several online videos) that Linux containers can’t be run on windows and visa versa. It is my understanding that this is due to the fact that the container doesn’t contain a ...
0
votes
0answers
11 views

How can I see the deployed container in Azure web app for containers

I have started using the web app for containers could not locate where the container is. And I want to see the contents of the deployment. Where are they located? I know it is there as the site works. ...
0
votes
0answers
731 views

How to debug a docker on web app for containers in Azure which does not start

I am able to run my containers locally. I published them to container registry. And the deployment from container registry to web apps for containers is successful. But the service does not turn ...
1
vote
1answer
432 views

docker volumes on cifs share cause permission disaster

I have a small vm running docker it only has a 20gig SSD which is more than enough for the OS + SWAP + Docker and the container images. But now I want to run a nextcloud docker image on that host. ...
6
votes
2answers
118 views

What methods are available for connecting many-to-many containers?

I have two containers (Docker): TensorFlow container NodeJS container used as a frontend to the TensorFlow container. Both containers have TCP listeners on a port specified using environment ...
0
votes
0answers
12 views

Payara container uses container id instead IP address

When I deploy an application on Payara server (Docker container) it changes the IP address with the container id. how can I change that behavior?
2
votes
1answer
55 views

Why screen folder in /var/run disappears in Docker container after running Ansible playbook?

Files I've got the following Dockerfile: FROM ansible/ansible:ubuntu1604py3 ENV DEBIAN_FRONTEND noninteractive RUN pip3 install ansible RUN printf '[local]\r\nlocalhost ansible_python_interpreter="...
2
votes
0answers
113 views

Container to Obfuscate

I have a few CI environment in VSTS. One for dev, QA, staging, and production. my builds are created in the cloud by VSTS build agents. these builds are not obfuscated by design and need to be ...
3
votes
1answer
566 views

Does Docker on MacOS support tmpfs?

I am new to Docker and I want to run Docker with ram only storage. In other words, I do not want Docker to save anything on persistent storage. I found out that on Linux Docker supports tmpfs. Is ...
1
vote
0answers
78 views

How can I make my clients (host) use my Squid proxy inside Docker container?

As an Example, I have 1 client (IP: 192.168.0.200) and 1 host (IP: 192.168.0.15). If client want to connect to the internet, then in host will be created container which contains squid proxy (I pull ...
0
votes
1answer
22 views

Apache Mesos - cases pro and contra containers?

My current impression is, Apache Mesos was introduced before the LXC container technology became easily available (via Docker). So you could implement "your own Apache Mesos Java framework" for ...
1
vote
2answers
2k 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
1answer
628 views

Minikube - Is there a way to run Windows Containers?

How do I run Windows containers on Minikube? Is it possible?
3
votes
1answer
335 views

Why Run Concourse CI in Kubernetes

I've just started exploring Kubernetes and Concourse CI. Learning still, so I'm still understanding all the concepts. Forgive me if this question sounds naive. Why would we deploy Concourse CI in ...
1
vote
1answer
723 views

Docker Compose V3 app container can't access couchdb container

I am trying to connect to couchdb through the container but my app is not seeing it. However if I use the external address 123.456.789.123:12345 (server_ip:external_port) it works but I need a ...
1
vote
1answer
124 views

How can integration tests for micro services be written?

Writing unit and integration tests for individual micro services is part of standard development processes. However, how can these services be tested with one another? And then integrated into a CI ...
7
votes
1answer
239 views

Should worker processes of web applications be placed in separate containers?

My setup is based on a Flask app that has a PostgreSQL and Redis database. In addition, a worker process is started to handle asynchronous tasks such as sending emails. I use Gunicorn to create ...
4
votes
1answer
224 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 ...
2
votes
0answers
853 views

Windows Service installation on Docker Container

I am trying to port one of our Tomcat based Windows application to Windows Nano Server Container. The installation process includes two Windows Service installations - an ActiveMQ service and another ...
6
votes
2answers
4k views

Difference between chroot and Docker

I don't understand the difference between docker and chroot. Yes its nice in terms of the packaging the registry. But somehow I get the feeling its just chroot with extra bells and whistles. I know I'...
2
votes
2answers
158 views

In kubernetes, using an nginx ingress controller what is recommended way of adding back end services?

I'm running on a simple KVM host and have poor man's load balancing with round robin DNS to and nginx ingress based on this chart which is documented here So to direct traffic to backend pods it ...
5
votes
3answers
2k views

Developing inside a Docker image?

Every time I onboard a new person on my team I have to go through the same routine of installing everything, figuring out what changed since last time we onboarded someone etc. Not fun. I've heard ...
1
vote
1answer
52 views

What does it mean that “outside of memory-managed code execution runtimes (JVM, Go, etc.) the usefulness of unikernels starts to rapidly decline”?

The benefit of unikernels is managing a large number of applications in a protected space. (Some might say all the benefits of Docker without all the overhead). (Please don't get me wrong - I'm a huge ...