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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Recover files from glusterfs server

Is there anyway to recover files from glusterfs server? There is .glusterfs folder with the files inside but it's coded/mapped for glusterfs server probably
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How do I install kubeadm on RHEL 8.x?

I am using RHEL 8.x in AWS. I cannot install kubeadm because when I try "sudo yum -y install kubeadm" I get No match for argument: kubeadm Error: Unable to find a match The directions I found ...
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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 ...
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Kernel random numbers generator fails on VMWare in a Debian VM - “Cannot find a hardware RNG device to use”

On a VMWare hypervisor in Apache CloudStack context, I get the following error with Debian 10: Aug 19 18:52:10 vm-ednus-1046 rng-tools[632]: Starting Hardware RNG entropy gatherer daemon: (Hardware ...
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Why access is denied by GitHub when docker-compose is run to start docker containers?

I would like to set up airflow with docker on MacBook Pro with macOS 10.14.x. I have got zpencerq/docker-airflow:1.10.2 and followed the instructions at https://docs.docker.com/compose/install/#...
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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 file to local ansible server from primary, then, copy ...
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1answer
23 views

reboot server during Ansible tasks

I have 3 scripts that must be run on server one by one. for example: - name: find config shell: /data/scripts/config1 become: yes become_user: root tags: find_config - name: change config ...
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2answers
30 views

copy contents of file on ansible server to another file on remote servers

I have a bash script on about 70 severs in /opt/zservice/etc/config that i want to change its content with ansible. the new content is on ansible server in this path /data/new_config. how i can use ...
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Which Users Should I Create With Terraform And Which With Ansible?

I am creating some Ubuntu VMs in Azure with Terraform. I am then configuring the VMs with ansible. When terraform creates the VM it creates an admin user resource "azurerm_virtual_machine" "main" { ...
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Azure Security Center with Ubuntu 19

Has anyone successfully gotten the Azure Security Center agent to work with Ubuntu 19? My omsconfig.log is full of messages like This event indicates that failure happens when LCM is trying to get ...
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What is the most common server permission policy for web application deployment?

I have a server with Ubuntu with a web server (Apache or Nginx) running a PHP application. The application consists of the following parts: An executable code that handles HTTP requests (say in the /...
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No swap limit support - docker engine

Below command gives a warning of no swap limit support. $ docker info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 0 Server Version: 18.09.5 Storage Driver: overlay2 Backing Filesystem: ...
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Build custom Linux distro ISOs with Docker?

Is it actually possible to use Docker containers as build environments for popular Linux distros like Ubuntu, Debian, CentOS, CoreOS or will be there some limitations? That is, output would be an ...
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1answer
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How to make PM2 as a autostart service?

I want to make my PM2 as a startup service, because for example when my server loses power or something happens to it, it does not automatically restart the PM2 service.
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1answer
19 views

how to give a user privilege to run Ansible commands or just an specific tag?

for example, I have a tag named 'installagent' and i want to run this command ansible -playbook -i /path agent.yml --tags installagent from another server via ssh on my Ansible server with user '...
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26 views

how to run an Ansible command for specific number of hosts

I am new to Ansible and i have a question about limitting hosts in a host group at running commands.I have these host groups in my inventory: [primary] host1 host2 [standby] host3 host4 ...
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AWS instance store volume - Create volume when instance is stopped/started thru SystemD(centos)

have an instance store volume(faster/cheaper) which we would like to create a volume(mkfs) when the instance is stopped and started via systemd. Is the best way for this is to have a shell script and ...
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1answer
111 views

How can I access the console of a booting EC2 instance in AWS?

I'm new to AWS and am looking for a way to access my EC2's console so I can triage issues such: boot to single user mode view console output as system boots gain console access to debug GRUB issues
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Utilise AWS IoT on non-supported hardware

Before I dig in too far, is there any way I can use any of the AWS IoT core functions on non-supported hardware? I can use the AWS Node.js libraries that are available (for my hardware), but I don't ...
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103 views

docker swarm init made docker go corrupted

I started learning docker recently and I set up a virtual machine (VirtualBox) with Lubuntu image: Linux verion: Linux 4.18.0-10-generic i686 Docker version: 18.06.1-ce, API-version: 1.38, Go version:...
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185 views

./mvnw -Pprod package command fails to download Maven

We have a new Jenkins-instance build from scratch as the old one started to have issues. While moving our pipelines we have encountered strange new error while trying to run a job for Maven project. ...
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62 views

What is the best method to start and stop an application?

I have some scripts to start and stop a java application which using jenkins. First option Check the port and kill pid if java is running. And then start the application. Second Option Write the ...
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1answer
59 views

How can container user and host user both have access to same files in volume?

I'm using Docker namespaces in an effort to allow files created within a volume to be arbitrarily read and written to by both the container user and the host user (please let me know if this is even a ...
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53 views

Install minimal dependencies with apt

I have a simple Dockerfile which looks like the following FROM debian:stretch-slim as builder COPY . my_project/ RUN apt-get update && apt-get install -y build-essential libpqxx-dev libtbb-...
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How can CaaS, PaaS, and FaaS users know if the operating system of their server environment is of the newest release?

Please consider this chart a moment; it shows the different hosting models common today: From the chart I learn that CaaS, PaaS and FaaS are three hosting-models by which a user can't control the OS ...
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How to pass language_in to Apache Ant build task

Ant is running jscomp on some JavaScript files. It doesn't recognise ES6 and newer features, and the task fails indicating syntax errors on let, etc. I found suggestions that language_in needs to be ...
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121 views

Is there a system which automates everything (OS release, and above) to host websites on?

This is not really a DevOps question but more of a System Automation question (which DevOps covers only a part of, by popular opinion, so I hope it's okay). I feel like some 5 USD IaaS VPS with ...
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1answer
61 views

How frequently do PaaS:VPS agencies upgrade OS_release in comparison to PaaS:shared-webserver?

I know that in a In PaaS:shared-webserver service a user could have the OS of its server environment release_upgraded in 8 or 12 years or so ! For example, I host a few sites on a particular host that ...
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1answer
19 views

What is the common term for Apache virtual hosts or Nginx block systems?

A webserver environment as with Apache or Nginx includes a type of file (or a file system) that I can call a webserver substrate; In Apache it is called a Virtual host and in Nginx I can call it a "...
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1answer
46 views

Why are IaaS hosting services are usually fixed-priced and PaaS are usually dynamically-priced?

Basic plans in IaaS host-providers like DigitalOcean and Linode are usually fixed-priced and basic plans in PaaS host-providers like Microsoft Azure or Amazon Web Services are usually dynamically-...
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What Ansible does in cases there's a conflict between OS version and some software Ansible manages?

Say I use an IaaS cloud on which I installed Ubuntu 18.04 manually via the cloud company's OS installation tool and I ought to establish an all-ansible LAMP environment that will include some more ...
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1answer
50 views

A cloud technology with automatic upgrades of my OS-release and web server release?

I desire a cloud technology that will redund my need of using Vagrant to continuously integrate OS release upgrades (say from Ubuntu 18.04 to 20.04 including all software installed by apt-get --- ...
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3answers
51 views

SSH tunneling to hosts deployed behind firewalls

I'm working on a deployment that will require me to place Ubuntu servers that monitor industrial equipment at various sites and behind firewalls that are out of my control. I need to maintain SSH ...
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Docker for Win10 + Linux Containers + tmpfs

I've been using WSL as a GNU/Linux development and test environment for a couple months (love it), but I have just run into my first major snag while playing with nuster and seeing much slower than ...
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Consul reporting file missing but file exists

I am trying to register a health check using the a config file but I have ran into an issue where it says a script file does not exist but it clearly does when I manually check if it exists. Checks ...
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1answer
88 views

How do I return just the full path of a file found with the find module in Ansible?

This has been reworded, expanded upon and clarified via an update late on 11/9/18. I request it be upvoted now that it has enough code. I want to find a softlink (to another file) in the $PATH ...
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1answer
351 views

How to redirect tomcat logs TO console?

So I have a problem that is the reverse of what everyone else on the internet wants.. I want to take tomcat logs that are being written out to /usr/local/tomcat/logs and have them be output to console ...
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53 views

Availability/Reproducibility of Ubuntu Minimal as Docker image

While for Debian you find on Docker Hub "slim" distributions, it seems not the case with Ubuntu. Now there is a "minimal Ubuntu for public clouds" distro from Canonical, but I can find just cloud VM ...
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308 views

Docker security risks passing secrets over environment variables

I'm new to Docker and want to put my Django web application into containers. For the last couple days I'm struggling with passing credentials safe to containers. Online there is always the hint ...
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1answer
689 views

How to keep configuration files automatically during apt-get upgrade or install?

When performing and apt-get update; apt-get upgrade -y on a server I encountered the message: Setting up sudo (1.8.16-0ubuntu1.5) ... Configuration file '/etc/sudoers' ==> Modified (by you or by ...
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2answers
188 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 ...
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1answer
329 views

Docker won't create a bridge network without being given an explicit subnet

The problem The problem is that this happens: $ docker network create alpine4 Error response from daemon: could not find an available, non-overlapping IPv4 address pool among the defaults to assign ...
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1answer
18 views

DirectAdmin 2 users same folder

So I'm still a rookie in devops but I am looking for a way where we can link a folder from user1 to a folder from user2. I guess its sort of a symbolic link? How would you do something like that? Or ...
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2answers
1k views

How to pass a /dev/disk device on macOS into Linux Docker?

I've connected external HDD via USD on macOS, and I'm running Ubuntu's Docker container as: docker run -it --device=/dev/disk3 --privileged ubuntu bash but the device is not present in the container:...
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2k 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 ...
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564 views

Running a powershell script via Jenkins on a Linux host

I have a powershell script cloned into my workspace from a bitbucket repository. If I login to the Jenkins server cli I can run it by doing cd /var/lib/jenkins/workspace/powershell pwsh ./psscript....
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1answer
163 views

Re-initialize etcd-cluster completely (on coreos)

Over the past updates (espcially the update to etcd-wrapper: https://github.com/coreos/coreos-overlay/tree/master/app-admin/etcd-wrapper) my etcd-cluster with five machines broke. Now I'm trying to ...
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1answer
68 views

Set user in aws

I have a lot of instance in aws.I have build through terraform. I have made scripts of making user(e.g. user1 rather than ec2-user).But i am facing one issue.when i check .ssh/authorized_key. I have ...
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1answer
30 views

Copying a file with special character & spaces

I have been trying to copy a file from my remote server to AWS s3, but the file name is quite weird and I am not able to figure it out what can I do. I tried using escape characters but that did not ...
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2answers
541 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 ...