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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.

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10 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 : ...
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0answers
13 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 ...
2
votes
3answers
69 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 ...
0
votes
1answer
19 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 ...
1
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1answer
29 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. ...
0
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2answers
32 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
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2answers
40 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
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0answers
14 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
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0answers
13 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 ...
0
votes
1answer
19 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
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0answers
35 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: ...
0
votes
2answers
26 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 ...
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0answers
9 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
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0answers
193 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
57 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. ...
5
votes
1answer
75 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 ...
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0answers
11 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?
1
vote
1answer
40 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
66 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 ...
1
vote
1answer
223 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
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0answers
45 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
18 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 ...
0
votes
2answers
763 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 (...
0
votes
1answer
409 views

Minikube - Is there a way to run Windows Containers?

How do I run Windows containers on Minikube? Is it possible?
2
votes
1answer
250 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
459 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
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1answer
99 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
168 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
152 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
611 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 ...
5
votes
2answers
2k 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
127 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
1k 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
45 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 ...
5
votes
2answers
627 views

Docker swarm join linux container Error - remote CA does not match fingerprint

Start docker swarm : docker swarm init --advertise-addr MANAGER-IP Join docker swarm: docker swarm join --token MANAGER-IP:2377 I am using Windows 10, it is working fine with Windows container mode,...
4
votes
2answers
275 views

How do you monitor varnish cache inside a docker container?

How do you monitor varnish cache inside a docker container? I have found many tools on Google relating to this but we are focusing only on nagios and new relic.
6
votes
2answers
805 views

Does Docker allow containers to be OS agnostic?

We currently use a Windows based server to host 2 VMs. One VM uses Windows with a Windows app and the other VM uses Linux with a Linux app. Is the below scenario possible? Bare server with Windows ...
2
votes
1answer
529 views

Running multiple websites on Docker in isolated or shared database containers?

So I have been reading up on Docker, and I cannot quite get my head around this concept. There are literally dozens of tutorials on the web about spawning a Wordpress instance on Docker within 5 ...
4
votes
1answer
361 views

Docker Images via Container vs Dockerfile

Pardon the dumb questions, but I've been learning about Docker and container technologies and I was learning about using Dockerfiles to specify build instructions for an image, and how each ...
3
votes
2answers
491 views

How to connect to external etcd server inside of docker container (python application)?

I have a Cement application that runs inside of a docker container. In this image I have to connect to etcd. Inside of my docker image I have config that for etcd is set to localhost that I know is ...
4
votes
1answer
52 views

Defined start sequence of containers

AFAIK you cannot influence the order how Docker Swarm starts containers for services. Is that possible with: Mesos? K8s (Kubernetes)? Rancher? Other? This question is not about specific ...
1
vote
1answer
262 views

How to start a service in fedora container without using systemd?

I want to start a service in my fedora docker container. But since systemd is not working in the fedora container. I am unable to start the service. I'm getting following error. Failed to connect ...
9
votes
1answer
2k views

Does “docker run” actually SSH into the container?

If I run docker run -it ubuntu bash Does it actually SSH into the container, or does it use another protocol?
4
votes
2answers
125 views

Load balancing kubernetes cluster on budget KVM provider?

There are a lot of cheap KVM providers these days that offer simple nodes with just a single external IP per node, without any load balancing. What is a typical budget load balancing solution for ...
3
votes
2answers
859 views

On Azure, how do I run a short-lived Docker container on a schedule?

I have a fairly simple Unix shell script packaged up in an Alpine Linux Docker container hosted on an Azure container registry. A VM runs this script with cron: docker login <snip> docker pull ...
1
vote
1answer
529 views

After removing Docker container, why is it automatically re-created?

I'm using ubuntu-16.04 desktop and installed Docker-1.5-1 and docker-engine-17.05.0~ce-0~ubuntu-xenial, in which I installed openmedicus/phplist. My aim is to remove the container, and the image as ...
0
votes
1answer
460 views

How to make custom SLES (SuSe Linux Enterprise) Dockerfiles?

To use a dockerized SLES, you need to use an official base image and run it on a SLES host. But this does not seem to work out of the box - what needs to be done to build a custom image? Dockerfile:...
11
votes
3answers
2k views

What are the reasons Docker should not be used for databases?

I'm having a discussion with a friend about use cases for Docker. One guy in the team wants to use Docker for everything - like a kind of universal unix process wrapper. The other thinks that Docker ...
5
votes
1answer
223 views

Does the “cattle not pets” distinction apply as equally to machine instances as to containers?

There is a great discussion of the Cattle vs Pets distinction from Randy Bias here. Martin Fowler talks about a SnowFlakeServer. In a series of talks, Adrian Cockcroft talks about how they moved ...
0
votes
2answers
109 views

Is there evidence to suggest that the Docker/Hashicorp ecosystem requires a higher calibre of software development engineer?

Our build system at work is a series of Go pipelines with go agents running in docker containers on a docker cluster. It compiles java and runs tests. This is in a financial services institution. We'...