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.
159
questions
0
votes
0answers
6 views
Tools for "scanning" container (hardening) vulnerabilities vs tools for "performing" the hardening
Container hardening is the process of fixing the vulnerabilities.
CIS has published a list of container vulnerabilities which should be addressed to complete the hardening process.
Q1. Are there ...
1
vote
0answers
23 views
Launching VM instances only when needed
I am looking for the right tool to launch VM instances on a cloud platform only when I need them. Once launched, they should run a containerized script (let's call it a job) that runs for about 5 to ...
2
votes
2answers
59 views
Restart container if its application hangs
I have a critical container application which task consist of polling sensors and taking consequent action on some external hardware.
If the application of the container crashes it's fine. restart: ...
1
vote
1answer
41 views
Docker Swarm stop working with redeploy service, require system reboot
I got a Docker Swarm with 3 nodes, and contain around 40-50 stack on it, now its random stop working to redeploy my new changes its just say in new mode, and really don't know what going one here.
ID ...
1
vote
1answer
292 views
How to communicate between AWS ECS containers
Problem
How do ECS containers communicate between each others?
Situation
I use docker compose ecs integration.
In AWS docker context, docker compose up did a deploy correctly.
But reverse proxy doesn'...
1
vote
2answers
81 views
Best Practice for Container Image Versioning
I'm looking for some guidance on best practices for container image versioning and despite reading a number of the best practice guides they leave some ambiguity.
I understand that most container ...
0
votes
1answer
40 views
How can I deal with container "patching" in a strict release process?
I am building a new Container and Kubernetes system for my company. Overall it is going well, but container patching has me a bit confused.
We follow a fairly strict release process. New versions ...
0
votes
1answer
94 views
Difference between Docker container with Debian vs VM with Debian?
What is the difference between running a Docker container with Debian (eg. https://hub.docker.com/_/debian/) and then running a virtual machine with Debian? And why is it still an advantage if any?
I'...
0
votes
1answer
38 views
When do I run applications on a server in a pod and when to run them directly on the base operating system?
I am trying to get started in the DevOps Field by setting up a small server currently with Virtualbox, later on for a small team. For my basic setup I plan to use gitea as self-hosted git and Jenkins ...
1
vote
1answer
31 views
Testing docker image builds when low level libraries change
Background
In our organization we have many small repos for shared libraries used among our applications. Particularly, we have many Python libraries and Python applications. We have a structures like:...
0
votes
2answers
39 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 |
\ /
\ /
...
0
votes
1answer
699 views
How to build, package and deploy a react-native-web app in a Docker container?
Given there is a react-native-web solution, what needs to be done to build it and run inside a Docker container?
What is the build environment/toolchain?
Which environment is required to run?
From ...
1
vote
2answers
363 views
Container Image Promotion across environments in ECR/ECS
We have started doing some initial work on deploying containers on ECS Fargate service.
However we are not yet completely figured out how to manage our image promotion across different environments.
...
1
vote
1answer
70 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 ...
0
votes
1answer
104 views
How can I use a buildah script for image generation using GitHub Actions?
Buildah scripts typically use shell. You can see an example of a script here,
#!/bin/sh
ctr=$(buildah from alpine:3)
buildah commit "$ctr" myAlpineImage
Let's say I have such a shell script ...
0
votes
1answer
152 views
kubernetes quota vs limit. What are they? How are they different? When should I use one or the other?
I have been reading through the docs but it still is not clear as to why I should use one or the other. They have great examples of how to configure them but don't answer the why for quotes or limits ...
0
votes
1answer
32 views
Does RAM Come Into The Container vs VM Decision?
I am currently running a Java trading system on a VM that needs ~32 GB RAM and runs (almost) 24/7.
There are a couple of engines linked to it that require 4GB + 8BG respectively.
I am considering ...
1
vote
1answer
2k views
Docker Build Ending Up `returned a non-zero code: 1`
Running mktexlsr /var/lib/texmf ... done.
Building format(s) --all.
This may take some time... done.
build.sh: line 81: -: No such file or directory
The command '/bin/sh -c bash build.sh' ...
1
vote
1answer
187 views
kubelet connecting to docker.sock instead of containerd.sock
Kubernetes version: latest
Installation method: kubeadm
Host OS: debian9
container runtime: containerd
Kubelet fails when starting and after inspecting the logs using journalctl -xeu kubelet i see ...
0
votes
1answer
20 views
Increase concurrent users by limiting container resources with docker-swarm
Consider the scenario where I have:
4 replicas of an app
4 cores
On load, the app consumes 100% for a single core
Can I tell each replica to only use 50% of the core and if so, would this allow at ...
0
votes
1answer
27 views
How to redirect the request to a different node when there is an unexpected exception and one of the pods gets restarted
We are deploying the application in a Kubernetes cluster and when we face an unexpected error and the pod gets restarted or goes down we are getting a 502 Gateway error even though there is another ...
4
votes
1answer
223 views
Change docker container’s log PATH
Team:
All my container logs are under /var/log/containers..
Where in kubelet or docker config can I specify this path such that logs are instead created under new path?
Ex : /shared ? Instead of /var/...
1
vote
1answer
82 views
Why is it necessary to have virtual machines to run multiple server instances?
I'm trying to learn about virtualization and containers. In an educational video it is said that the introduction of virtual machines was a big deal because it made companies available to run multiple ...
0
votes
2answers
1k views
How to get the IDs of Docker Containers that belong to a Service, given the Service name or id
Background
I'm trying to maintain some websites running in a Docker Swarm. I want to do security updates on them.
In a non-Docker environment, like a VPS, my simple process is that I would connect in ...
0
votes
1answer
21 views
Helm Repo: can it host dockerfiles and other image-building artifacts
I have a service that I want to port to Helm. It's a django application that requires memcached and postgresql and a forward proxy like nginx.
I would ideally like to have one repository with all that ...
0
votes
2answers
1k views
Can I upgrade a docker image/container from buntu 18.04 to ubuntu 20.04?
I have a host ubuntu 20.04 running my software on docker with a container derivated from ubuntu 18.04. I would like to use ubuntu 20.04 for several reasons (like the better software on 20.04).
If I ...
0
votes
1answer
58 views
hello world with flask and redis using docker networking
The sample from Docker, a "hello world" with redis and flask, seems to build fine, but, as an exercise can it be broken into two components?
The redis service uses a public Redis image ...
1
vote
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 (...
0
votes
1answer
58 views
how to push an image to docker hub?
How do I push this image to docker hub?
root $
root $ docker images helloworld_web
REPOSITORY TAG IMAGE ID CREATED SIZE
helloworld_web latest ...
2
votes
1answer
75 views
How to Connect Docker Containers?
In "What is a container?" the docker docs show the following nifty image:
For my scenario I have only App A and App B; let's designate them Alice and Bob. How do Alice and Bob communicate, ...
0
votes
1answer
34 views
How to deploy MySQL server repeatedly
From fifty-thousand feet, how are, for example, multiple MySQL containers handled?
In the context of my limited experience, simply running the container is insufficient, with additional configuration ...
0
votes
1answer
230 views
How to gain console access to a MySQL server running on a docker container from the host?
I thought I had this working a few minutes ago:
root $
root $ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS ...
0
votes
1answer
325 views
How to gain root access to an existing docker container?
Able to get a response from the docker hub basex container:
nicholas $
nicholas $ lynx http://localhost:8984/ --dump
No function found that matches the request.
nicholas $
Ran the container as:
...
1
vote
1answer
3k views
docker: Error response from daemon: Conflict. The container name "/basexhttp" is already in use by container
Am I even correctly following the documentation on creating and running a docker container below?
[root@ ~]#
[root@ ~]# docker run -d \
> --name basexhttp \
> --publish 1984:1984 \
> ...
1
vote
4answers
761 views
how to start a docker container which dies immediately after startup?
On the understanding, from #docker on IRC, that the basex container from docker hub died after starting up, how do I now make it run something which doesn't immediately exit?
I'm only trying to get a ...
0
votes
1answer
1k views
cannot get bash prompt: Error response from daemon: Container foo is not running
A basic jetty container:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
...
0
votes
1answer
110 views
Can't access startfile http://localhost/
Having created a docker container as:
docker run -d --name=jetty jetty
How do I now get a hello world page as?
Looking up localhost:8080
Making HTTP connection to localhost:8080
Alert!: Unable to ...
0
votes
1answer
473 views
How to create a "silent" MySQL docker container?
How can I create a MySQL docker container as below in the background:
root:~#
root:~# docker run -e MYSQL_ROOT_PASSWORD=pass --name sql-db -p 3306:3306 mysql &
[1] 137878
root:~# 2020-09-01 08:25:...
0
votes
1answer
830 views
how to send a password to MySQL with docker?
Just getting started, want to run the downloaded version of mysql:
root:~#
root:~# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
basex/basexhttp ...
0
votes
1answer
153 views
Can't hit redis using DNS name in multi-container pod on Kubernetes
Can anyone shed some light on why this might not work? I can access redis just fine using the pod's IP address,
$ rdcli -h 10.152.183.65
10.152.183.65:6379>
but when I try to use the DNS name, I ...
1
vote
1answer
57 views
Why is Docker best practice to minimise the number of layers in an image?
I see here that
Docker best practices says .. minimise the number of layers in our images
The tips given are to chain multiple lines in the dockerfile with \ so as to combine many lines of code into ...
0
votes
1answer
75 views
Is it possible to install bitbucket container on Centos?
I'm trying to run the below composefile on centos7:
version: "3.3"
services:
bitbucket:
image: atlassian/bitbucket:latest
ports:
- 7990:7990
- 7999:7999
networks:
...
4
votes
1answer
127 views
How not expose my backend
I'm studying Docker and how to properly publish my containers coding a very simple web application. It has only two containers, backend and frontend. I've published the source code here: https://...
1
vote
1answer
23 views
Linking nodes in a cluster to run a single instance of a docker container
In this cluster, there are 11 identical nodes, each with 16gb of memory. So far, I've been able to connect each node of the cluster to a docker swarm hosted on the control node. My end goal is to run ...
3
votes
1answer
83 views
Porting a docker container to a different Linux host OS
I'm new to Docker. I have looked at many tutorials, however, this is still not clear to me :
For example, If I create a docker image on a system which is using Ubuntu as the host OS. Can I then later ...
6
votes
2answers
2k views
Stress testing for docker container
I want my container to die under high pressure to check monitoring and alerting as well as compose autorestarts. What is best way to simulate heavy load within docker container. I've tried so far
...
1
vote
3answers
1k views
Can I run a Ubuntu 16 Docker image on a Ubuntu 18 host? Will I need to install hardware drivers already available to the host?
We have some Docker images built from Ubuntu 16.04 base image, and we've been running them on hosts running Ubuntu 16.04; these hosts are laptop computers from different makes. However, we have had ...
0
votes
1answer
27 views
Should my zombie backend container be restarted when database is down?
I have a situation where I have a Postgres and a Node server which connects to it. I am using Kubernetes to deploy them.
If my Postgres container fails and stops working then its livenessProbe will ...
0
votes
1answer
1k views
What is the difference between a jail environment in linux and docker container?
I am curious about difference between a jail environment in linux and Docker. What separates these two technologies?
1
vote
1answer
29 views
Auto-managed docker-compose volume not shared among containers
I have a bit of hard time understanding the way docker-compose handles auto-managed volumes. Here is an example docker-compose.yml
version: '3.7'
services:
one:
image: alpine
command: sh -c ...
