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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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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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38 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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0answers
53 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
34 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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1answer
30 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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1answer
46 views

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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0answers
9 views

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 ...
3
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1answer
69 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
59 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
17 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
44 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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2answers
38 views

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
45 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
46 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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0answers
28 views

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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0answers
7 views

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 ...
1
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1answer
57 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
84 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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3answers
36 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 ...
4
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2answers
80 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 ...
5
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1answer
239 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
51 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 ...
2
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1answer
69 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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0answers
26 views

Jenkins Fatal Exception

I have installed my jenkins on Linux machine with 2.73.1 version. Now my most of the jobs are getting failed due to same reason. AU bin/jobs/Sync.class A .settings A ....
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votes
1answer
16 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 ...
4
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2answers
461 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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0answers
13 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. ...
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0answers
866 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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0answers
270 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
61 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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votes
1answer
43 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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0answers
74 views

How create ftp and ssh access for users and keep overall environment safe

//edit In practice I would like to create a shared web hosting and I wonder how create ftp and ssh access for users and keep overall environment safe. Docker will be ok for this purpose? How use ...
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1answer
28 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 ...
0
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1answer
292 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 ...
3
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2answers
66 views

Deploy two independently hosted services in production at once without any downtime

I have two different services. Let's say Service A and Service B. Service B is dependent on Service A. Both code bases are hosted in separate repo in Bitbucket and code bases are maintained by ...
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0answers
51 views

Do you need to install MySQL on Linux separately from MariaDB?

I'm compiling MariaDB from source, and trying to test the DB following the instructions, and I keep getting errors about mySQL (which I thought packages were installed along side MariaDB) Failed ...
3
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2answers
385 views

Ultimate docker permission solution

I'm using docker some time and I like the conception very much. But I found a thing is a big problem for me. I'm talking about permissions. While I'm not worrying about production, setting up my ...
5
votes
2answers
202 views

How to automate rolling upgrades for ec2 running linux behind elastic and/or application load balancer?

Would like to ask for recommendations on ready automated solutions or templates for rolling ec2 instance upgrade on AWS, requiring a reboot with ELB/ALB. Specifically required to perform the ...
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1answer
211 views

Windows Docker in swarm with Linux nodes connection issue

I have the following setup for my docker swarm: three Linux master nodes one Linux slave nodes Windows slave node They are connected with an overlay network. Within the linux nodes everything works ...
2
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1answer
2k views

Permission errors with non-root USER when running on Linux

I have been getting some unexpected failures with the execution of my Docker images when running on my Ubuntu 16.04.3 LTS machine. I'm using Docker version 18.02.0-ce (edge), installed from apt. I've ...
6
votes
6answers
237 views

In the HashiCorp stack, where's the appropriate place to add users?

I'm in the process of building some custom Linux images using HashiCorp's Packer, which will later be deployed to Azure using HashiCorp's Terraform. The VMs created from these images will need to have ...
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2answers
1k views

Creating a cron job with Ansible (ERROR! 'cron' is not a valid attribute for a Play)

I am relatively inexperienced when it comes to Ansible however I have previously created playbooks which will create a cron job successfully. For the life of me I cannot work out what is wrong with my ...
3
votes
1answer
35 views

Is it possible to securely delete a file from a virtual disk in a cloud provider?

Considering that virtual hard drives are generally formatted using something like ext3 that abstracts away from the underlying block device, which in and of itself is an abstraction over the top of a ...
1
vote
1answer
1k views

Apache container cant access php files mounted in /var/www/ - 403 error

I want to run my php website in a container with apache and php7 I am using this docker image : https://hub.docker.com/r/nimmis/apache-php7/ I run Fedora so I enter the example command given in ...
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2answers
2k views

How can a Windows server be a slave to Jenkins running on Linux when there in an error installing the slave-agent.jnlp file?

I want to have a Windows Server 2016 slave node with a master Jenkins (version 2.89.2) running on Red Hat Enterprise Linux 7.x. I am trying to install the slave-agent.jnlp file from the Jenkins web ...
4
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1answer
53 views

What's missing from this simple recipe that creates a user?

I've spun many boxes in the cloud before, but was growing tired of going through the same dance; and as I'm trying to get familiar with Chef, I figured, that's a good use case to do a little learning. ...
5
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1answer
95 views

Pause/Suspend guest in KVM without virsh and libvirtd

I have installed KVM without libvirt/virsh and virtualmanager. Packages which installed are kvm qemu-kvm bridge-utils libguestfs-tools How can I pause/suspend VM in this case?
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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'...
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1answer
99 views

How to avoid and fix the warning from Graphite-manage?

We installed Graphite on our Linux server, and when we started running it, we saw the following warning from the graphite-manage script: graphite-manage syncdb --noinput /usr/lib/python2.7/site-...
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2answers
54 views

CentOS 7 SSH login with Keys Authentication

Is there any possibility to create one master account (for one master laptop for example), from which I can log in to all accounts available on the server ? My server has Keys Authentication enabled ...