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Questions tagged [linux]

Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel. Use this tag for questions about DevOps practices, processes and tools in Linux environments.

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4 views

bulding docker image for an arm32v7 processor

I managed to build a working docker image on my development laptop, but got an exec format error when I tried to run the docker image on the PC that the container shall run on. My dev PC is an ubuntu ...
0 votes
2 answers
116 views

Using docker as a substitute for VM for testing

I'm new to docker and I want to start using it in the following scenario. For example, I need to implement an Asp.Net Core Web API and deploy it to a linux system. The development is done on a Windows ...
2 votes
1 answer
4k views

Unable to connect to the server: tls: failed to verify certificate: x509: certificate signed by unknown authority

I am facing issue when trying to import k8s cluster in Rancher. here are the logs of when trying to run the commands: Commnad: curl --insecure -sfL https://172.31.91.168/v3/import/...
0 votes
1 answer
119 views

How to make a CI/CD of an ASP.net core app to Linux compute engine instance

I'm using Google cloud, I have a linux VM up and ready for use, I have an ASP.net core web app on Azure devops. I have configured the build pipeline for this webapp, now I want to automate its ...
0 votes
0 answers
9 views

Why aren't the iptables `pkts` and `bytes` count getting updated for Docker Containers, on receiving tcp packets?

I'm currently running NixOS-23.11, without any special configuration for docker, just the default install from nixpkgs. I have the following Dockerfile definition: FROM alpine:latest COPY ./index.html ...
75 votes
9 answers
142k views

How do you back up Jenkins jobs & master configs?

I'd like to backup all Jenkins jobs and config files. What's the easiest way of doing it?
3 votes
1 answer
248 views

Is running linux container on windows aws instance possible?

what I'm trying to achieve is running a Linux(ubuntu LST) container inside a windows server 2019 OS. The problem is that the windows OS runs as an AWS instance. There have been problem for me trying ...
1 vote
2 answers
186 views

Prometheus not Starting (Exec Format Error)

I am trying to run Prometheus on my Ubuntu Linux VM on a Mac M1 (if those details are necessary). OS: Ubuntu 23.10 Prometheus: 2.51.2 I make the config files, and as I run the following lines, sudo ...
2 votes
1 answer
335 views

Docker performance when running on LVM

It seems that when using overlay2 storage driver, docker is much slower when using a LVM compared to without a LVM (ext4 filesystem in both cases, same machine). Questions: Is this intended/expected? ...
0 votes
1 answer
552 views

Ansible - 'loop' requires a list and got a list, but doesn't work

Minimal reproducible example: role/defaults/main.yaml: node_sysctl: kernel.shmall: 197951838 kernel.shmmax: 810810728448 kernel.shmmni: 4096 role/tasks/main.yaml: - name: Tune sysctl sysctl: ...
0 votes
1 answer
244 views

Terraform wanting to redeploy azure vms for 'no' reason

I got a VM defined in terraform like this: resource "azurerm_linux_virtual_machine" "vm" { name = var.vm-name resource_group_name = var....
0 votes
1 answer
584 views

Where is located mysqldump log file on Linux/Ubuntu

I am neither a DB administrator, nor a DevOps but I need to migrate a very large table (~500M rows) from one MySQL schema to another. For doing so, I use mysqldumpbackup tool. Also, since the DB is an ...
3 votes
2 answers
9k views

using copy module with wildcards

I need to copy a database backup file from a primary server to a standby server. Since I can't use synchronize, I was following this method: copy a file from primary to the local ansible server, copy ...
0 votes
0 answers
102 views

Permission denied when mounting volume with podman in fedora

I use a docker-compose.yml file to boot my containers. My container mount to a external volume which targets a directory inside my user profile (postgres database files). However, after switching from ...
3 votes
1 answer
3k views

docker-credential-desktop.exe not installed

Moving from Docker Desktop for Windows to Docker Server / CLI for Linux to escape the license fee, I used the standard documentation for Ubuntu to install docker into my WSL2. After frankensteining it ...
-1 votes
1 answer
951 views

unzip | caution: filename not matched [closed]

I'm trying to unzip multiple files which has a prefix in common service1.zip service-2.zip service_3.zip and so on... Now, when I try to unzip all those files at once using the command unzip service*....
0 votes
0 answers
18 views

How to make master node and worker nodes before installing kubernetes on Ubuntu?

I am trying to install kubernetes on my Ubuntu 22.04 os. I found blogs and videos in Youtube but failed and deleted all. I had hard time when making master node and worker nodes because there was no ...
2 votes
0 answers
1k views

Ansible/AWS dynamic inventory -- How to create groups based on tags?

I am trying to create custom groups, based on tags. I am using this doc as a reference: https://docs.ansible.com/ansible/latest/plugins/inventory.html#inventory-plugins As a baseline, in my aws_ec2....
2 votes
1 answer
402 views

SFTP server with third party user management system?

I understand how to set up SFTP servers on Linux and create users and their passwords manually. So basically, the users get authenticated as normal Linux users get authenticated through /etc/passwd. ...
1 vote
1 answer
82 views

Why Minikube has different kernel version in its pods/containers than host OS?

I am running Minikube on a Linux kernel 6.1. I added a uname -r command in an image to check which kernel version the container "sees". And its 5.10.57. I expected the version to be 6.1 as ...
1 vote
2 answers
1k views

Chown inside docker container is not changing directory owner

I can't change ownership of newly created directory inside of docker container. It is not a volume and chown runs correctly for all my colleagues - the only difference is I'm running docker on linux ...
0 votes
2 answers
544 views

show running docker containers nicely formatted

Default layout of output from docker ps is somewhat unwieldy ... how to get a better presentation of all locally running docker containers from terminal on linux ? For context below is output from ...
2 votes
1 answer
1k views

Does docker engine (not Desktop) support Linux containers on Windows 11?

I've installed docker engine according to the following instructions: https://docs.docker.com/engine/install/binaries/#install-server-and-client-binaries-on-windows I'm trying to run Linux containers ...
1 vote
2 answers
5k 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 ...
1 vote
1 answer
2k views

Ansible Unsupported Parameters for using handler

I'm trying to run a ansible task but I keep getting an error. This is the play I want to run: - name: use of handlers hosts: all tasks: - name: install packages yum: name: httpd ...
0 votes
0 answers
33 views

Implementing the right conditions for a yum command for centos5 in Ansible

I'm currently working with a centos5 host and I have to install some packages with yum. Unfortunately, as far as I know, centos5 doesn't support Ansible's yum module, since it requires python2 ...
10 votes
5 answers
37k views

Docker compose volume syntax valid for Windows and Linux

We have developers working on an app using both Windows and Linux. The application is built within a Docker container, and ships a docker-compose specification for the build environment. The local ...
2 votes
0 answers
22 views

Linux Cloud/Windows On Prem Deployments

I have sort of a unique problem where I have a cloud deployment (linux) that needs to be ported to an on-premise deployment (windows). The constraint is that this is medical software and hospitals ...
1 vote
1 answer
441 views

Why does stripping executables in Docker add ridiculous layer memory overhead?

On this image, I ran the following command to reduce executable sizes: find -P -O3 /usr/bin/ /usr/local/bin -type f -not -name strip -and -not -name dbus-daemon -execdir strip -v --strip-unneeded '{}' ...
1 vote
2 answers
2k views

Rebooting node at end of Jenkins pipeline

I have a pipeline that runs on a dedicated bare metal node for automated performance benchmarking. Using bare metal is necessary due to the nature of the project. Near the end of the pipeline, the ...
26 votes
3 answers
25k 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'...
-1 votes
1 answer
386 views

Can't run apt-get update in an Ubuntu 16.04 docker container

Everytime I run apt-get update -y in my Ubuntu 16.04 docker container, I get the following error: Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease Hit:2 http://archive.ubuntu.com/...
0 votes
1 answer
28 views

What would be the monthly hosting cost for eSchool Smart System [closed]

I have no idea about DevOps. Sorry in advance if the question is something not relevant. I have to propose a cost of yearly/monthly for a system. The system will have two versions. Web (React & ...
1 vote
1 answer
39 views

How to ensure data protection on remote server?

We have sensitive data from a customer and need to train a Neural Network for our customers. However we have no severs to train the Neural Networks, so we want to rent GPU servers. There are many ...
0 votes
1 answer
1k views

How can we setup the services in my EC2 instance to startup automatically on boot?

When ever I restart my EC2 instance I have to manually use the command systemctl start <service name > to start the service. Is there any option to automate this thing in the Linux platform?
0 votes
1 answer
57 views

Ansible user_module exit with "rc: -25" if UID is large

Ansible user_module exit with rc: -25 if trying to create user with UID provided from Active Directory (AD) domain controller (DC). main.yml - name: Configure local user for example.com user: ...
0 votes
1 answer
2k views

How to assign static IP to Kubernetes cluster?

Is there any way to assign static IP to Kubernetes cluster, in which any user can able to access its application over static IP only. for an example, I have set up a cluster over 192.168.0.131 (master)...
1 vote
1 answer
504 views

Ansible with OpenSUSE transactional server

When using an OpenSUSE transactional server, transactional-update must be used instead of Zypper. Is there any way of doing this with Ansible?
1 vote
1 answer
3k views

How to add a string to a line when it doesn't exist?

I'm trying to solve a problem where I want to add a setting 'pci=noaer' to all kernel definitions in /boot/grub/grub.conf, but only if the setting doesn't exist. I've managed to get the basic ...
1 vote
1 answer
3k views

Minikube will not start again after a stop

Running gentoo linux... I am new to kubernetes and learning it on my dev cloud. I am able to start minikube with no issues (other than the second node is missing...not sure why). Then I stop minikube. ...
1 vote
1 answer
114 views

Team City Server issue after upgrade

Recently we have upgraded TC to the latest version (TeamCity Professional 2021.1.1 (build 92714)). After upgrade builds run fine when a new VCS root is created, but after a push is made to the ...
0 votes
1 answer
1k 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'...
2 votes
1 answer
152 views

How to pin public root key when downloading an image with docker pull (Docker Content Trust)?

How can I execute docker pull (with Docker Content Trust enabled) such that it fails if the image doesn't have a valid signature using the private key corresponding to (or subordinate to) the public ...
2 votes
1 answer
532 views

Ansible - Variable expansion inside hostvars declaration?

I have a hardcoded hostvars line, like so: node1_hostname={{ hostvars['192.168.0.162']['node1_hostname'] }} I have a set_fact variable from a previous play that I'd like to expand in the host section ...
1 vote
1 answer
703 views

Failed to install kubernetes on centos

Following the official documentation, I have an error when trying to install kubernetes cluster yum package. I am on Centos 7 using yum. So I run this commands: cat <<EOF | sudo tee /etc/yum....
0 votes
1 answer
1k views

Ansible No such file or directory error message for any executable in Amazon Linux AMI

I'm trying to run this command in a Amazon Linux AMI instance - name: Run docker shell: systemctl enable docker && systemctl start docker And receiving this error message "stderr&...
6 votes
1 answer
6k views

Ansible: register variable with loop

What’s the best way to use registered variable ‘audit_tools’ to check if all items are own by root ? Do I need to use Jinja2 filter or something ? Thanks - name: Verify audit tools are own by root ...
0 votes
1 answer
772 views

any way to limit "docker logs" output by default?

Context* I forgot to pass the "--tail" options to the "docker logs" command when inspecting a running container. The affected container dumps tens of millions of logs. The command ...
0 votes
2 answers
4k 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 ...
2 votes
2 answers
2k 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 ...