Questions tagged [coreos]

Container Linux (formerly CoreOS) is a lightweight Linux-based operating system which is design to support building clusters of machines which run applications containerized with docker.

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How to modify the grub default timeout for CoreOS?

I am trying to reset the root password for my CoreOS machine for which I need access to the machine's grub. However, I don't see the grub at all and the machine boots up. I am on CoreOS stable (1010.5....
jobin's user avatar
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Ldap client on CoreOS

Has anyone setup ldap on CoreOS before? If so, how does one do such a task? I have a cluster of CoreOS machines and I'm trying to hook up this service Foxpass https://www.foxpass.com/ to it for user ...
Christian Grabowski's user avatar
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Coreos auto scaling with docker and fleetctl on AWS

I spent a lot of time evaluating different ways to deploy an application to the cloud (let's assume AWS for this question) in the last few weeks but couldn't really find a satisfying solution. We ...
Daniel Torres's user avatar
2 votes
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Kubernetes on Flatcar Linux will not start up kube API server after a reboot of the master node

Thank you for reading and taking your time to review this problem. I have a problem using my Kubernetes cluster. It is running Flatcar Linux, made by Kinvolk, recently acquired by Microsoft. I have ...
jonasclaes's user avatar
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Cloud Init with Flatcar Linux -- Configuration not applying when passing custom file?

I'm using Telmate's Terraform provider for Proxmox and trying to deploy Flatcar linux virtual machines using Cloud Init by passing files via cicustom. Based on their example, I have crafted the ...
TJ Zimmerman's user avatar
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CoreOS docker host cannot access containers by IP; other computers on LAN can

We have a problem that our server hosting our containers are unable to access them with their IP, while other computers on the network can. We've got the following setup for our LAN: A server ...
Fredrik Kiby Zetterman's user avatar
2 votes
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1k views

Forward to remote syslog in CoreOS

I want to aggregate CoreOS logs to Papertrail service, which basically provides a syslog endpoint for aggregate logging. Common advice for this setup seems to be starting a service that does ...
Alex B's user avatar
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systemd journal and docker

I am using CoreOS which uses systemd and docker. One of the big issues with systemd and CoreOS is that it doesn't play 100% nice with docker. Or maybe docker doesn't play 100% nice either. Another ...
hookenz's user avatar
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Routing a flannel overlay network through AWS VP peering

I have 2 VPC on AWS VPC-A 172.31.0.016 and VPC-B 172.17.0.0/24 I've created a VPC peering and I can reach all the services running on VPC-B from VPC-A and vice versa. Now I created a flannel virtual ...
nolith's user avatar
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CoreOs unit and data container refused to start

I am trying to create a postgres data container and make it act as a sidekick to a main postgres unit so that the main unit can share the data container's volume. Attempting to start the main unit ...
Kennedy's user avatar
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Docker container can't communicate with etcd

I created 3 coreos machines at digitalocean using this cloud-config.yml: https://gist.github.com/socketwiz/d6fe23d19180a1ad8b5a where token was replaced with the one I retrieved from: $ curl -w "\n" ...
Ricky Nelson's user avatar
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I can't install CoreOS to disk

I'm trying to install CoreOS to disk, and I'm following the recomendation from official doc. I have PXE with CoreOS, then I'm booting CoreOS from RAM and I continue these steps: execute: cfdisk -z /...
enrique-carbonell's user avatar
1 vote
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Fedora CoreOS os-tree apply-live not working

I'm trying to install k3s-selinux on Fedora CoreOS 38 with a systemd unit file: [Unit] Description=K3s SELinux policy Wants=network-online.target After=network-online.target Before=zincati.service ...
sctx's user avatar
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How to send pending shutdown message to systemd services

I'm using Fedora CoreOS with the automatic updater enabled, which is great for my use case. Already, when logged in interactively, the system warns about an imminent shutdown/restart via the console, ...
ljrk's user avatar
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Fedora CoreOS Offline Installation with USB

I have been assigned a task to evaluate Fedora CoreOS, I mostly install CentOS with KickStart file. I searched a lot but couldn't find any source where i can customize Fedora CoreOS ISO file and add ...
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fsync-intensive Docker application mysteriously much slower

I have an application that is very fsync intensive. When I run it on a traditional VM the application is quite slow. When I run it in a Docker container on CoreOS it gets much faster, by at least a ...
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Tips for debugging NFS mounts in systemd

I'm running CoreOS, which uses systemd. I have several NFS mounts which work fine on my Ubuntu 14 system, but are not reliably connected at startup under systemd. I've defined them like this (where ...
Nathaniel Waisbrot's user avatar
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Docker on CoreOS VM behind Corp proxy

I have Docker on a CoreOS VM which runs on top of KVM. VM Networking: $ virsh net-edit libvirt <network ipv6='yes'> <name>libvirt</name> <uuid></uuid> <...
hossein's user avatar
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CoreOS isn't automatically updating

I have a bunch of CoreOS machines installed from an ignition template, served via matchbox. The machines are running 1185.3.0, which is not the most recent stable release. They do not automatically ...
Chris Jones's user avatar
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CoreOS: how to set dependencies for Docker containers in cloud-config?

I have a basic cloud-config.yaml to run four containers on CoreOS (directly, without clustering). Two of the containers (nginx-gen and nginx-letsencrypt) mount volumes from the container named nginx. ...
techraf's user avatar
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CoreOS logs flooded with "Unknown permission status for class system"

I am trying to debug an issue, and I was wondering if this rings a bell to anyone: My logs get flooded with audit: type=1107 audit(1479418315.344:1053): pid=1 uid=0 auid=4294967295 ses=4294967295 ...
m6a-uds's user avatar
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1 answer
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CoreOS: How to serve different cloud-config "profiles"

I am just getting started with CoreOS, I've been following the step-by-step tutorial about setting up Kubernetes, but I seem to be missing a very basic concept. As I am using Bare Metal, I use the ...
AlexR's user avatar
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Why a fleet service doesn't run but docker command does?

I have a fleet service in file nginx.service which I am trying to launch on CoreOS: [Unit] Description=nginx [Service] User=core TimeoutStartSec=0 EnvironmentFile=/etc/environment ExecStartPre=-/...
Sergei Basharov's user avatar
1 vote
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268 views

Can't 'docker pull' from CoreOS to an insecure local Docker repository

I have followed these instructions to no avail: #cloud-config coreos: units: - name: docker.service drop-ins: - name: 50-insecure-registry.conf content: | [Service] ...
Inquisitor Shm's user avatar
1 vote
1 answer
578 views

using same LVM volume for devicemapper and a bind mounted volume

I'm running an Amazon EC2 machine with a 512GB EBS mount. My plan is to split the EBS into two parts - one to be used by Docker 1.11 for its images (via devicemapper) and another to be bind-mounted to ...
Sandeep's user avatar
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1 answer
486 views

SSH fails on CoreOS when substituting etcd cloud-config variables

I have a minimal cloud-config that works without problems on DigitalOcean. I added some hardening for SSH, which requires restarting sshd.socket to become effective: units: - name: sshd.socket ...
Rolf W.'s user avatar
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296 views

Does a CoreOS member need to have a public ip to join an etcd2 cluster?

I am starting 5 coreos EC2 members all in a private subnet. Then assign one elastic ip to one of the members. It seems that only that one with an ip assigned can join the etcd2 cluster, and is ...
theRemix's user avatar
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440 views

virsh net-define for CoreOS cluster

I have a kvm/qemu/libvirt host with several VMs running happily on br0 with IP addresses that are in the same network as the host they run inside, 192.168.10.0/24. So I'm playing with CoreOS and ...
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Configure cloud-config using Azure Powershell 1.0

I have spent some significant time getting an Azure PS script starting up a few CoreOS instances. I have everything working except I have no clue how to get the cloud-config added. Using the CLI, ...
Dave's user avatar
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CoreOS Random Reboot Kernel Panic with Obscure Message - How to debug?

I'm relatively new to the CoreOS world, we had a server reboot and the messaging in the Journal is extremely vague: Sep 18 07:10:27 ip-x-x-x-x.us-west-2.compute.internal kernel: BUG: unable to handle ...
Christian Nuss's user avatar
1 vote
1 answer
1k views

Having trouble to connect sshd on CoreOS sometimes

I have 12 node of bare-metal CoreOS cluster (on SuperMicro Blade). Every nodes was installed with same image and cloud-config. (Stable 717.3.0) The problem is that I fail to connect sshd frequently, ...
Younggun Kim's user avatar
1 vote
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282 views

nvidia driver displaying odd bios,uuid under Grid K2

I have a number of servers that have GRID K2 nvidia Tesla cards in. Initially these were working fine. But I recently upgraded the kernel driver and have found a problem where CUDA based apps were ...
hookenz's user avatar
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1 vote
1 answer
346 views

Create a local cluster with Vagrant/CoreOS/Docker

I'm trying to create a local environment for testing purpose composed of: a Vagrant CoreOS Cluster (3 nodes) a Docker container launched with an Nginx image loaded, launched on one node I've ...
AcidCrash's user avatar
1 vote
0 answers
194 views

neo4j docker coreos - logging everything to the console

I’m setting up neo4j in docker for use in a coreos cluster. The container is running neo4j console and I want all the logging to go to the console. I’ve updated logging.properties to only use the ...
brendanjerwin's user avatar
1 vote
1 answer
87 views

systemd out of control starting service

I am trying to get a CoreOS system up and running stably on Microsoft Azure and am almost there. My only problem now is that systemd seems to be out of control with regard to starting etcd and fleet. ...
Nathan Hartzell's user avatar
1 vote
0 answers
707 views

installing CoreOS using usb device and CoreOS ISO

I have some doubts about installing CoreOS using the image ISO. I follow the steps in CoreOS docs, in the Install section: cfdisk -z /dev/sda touch "/usr.squashfs (deleted)" # work around a bug ...
Robert's user avatar
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2 answers
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How can I rename network interfaces in CoreOS 1010.6.0?

All of my servers use ens802f0 as the primary Ethernet interface except one which has insisted on using ens802f1. How can I change the names of the interfaces? I would like to rename ens802f1 to ...
mr.zog's user avatar
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358 views

How to mount /usr in CoreOS from NFS?

We are working on diskless (not really diskless, but with readonly disks) stations. So we found a way to store all havy stuff on remote disk. Is there any way to mount /usr from NFS partition?
tse's user avatar
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1 answer
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How to configure /usr/share/oem/grub.cfg on core-os by using ignition?

I try to configure /usr/share/oem/grub.cfg at first boot, but it not do what I intent to do. It just mount and edit on another path. Any suggestion please. log_file: May 03 02:56:01 localhost ...
Sila Taepakdee's user avatar
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0 answers
687 views

Why does gsutil rsync on CoreOS fail with 'CommandException: arg () does not name a directory, bucket, or bucket subdir'

On a recent Google Cloud Platform CoreOS VM, the command gsutil rsync -r gs://some-bucket-here dest fails with: CommandException: arg (dest) does not name a directory, bucket, or bucket subdir. $ ...
Ray Walker's user avatar
0 votes
1 answer
438 views

Can't login to coreOS after PXE deployment

I'm trying to deploy CoreOS using Ubuntu PXE server. The target boots, loads CoreOS and asks for username and password. That's where I'm stuck. I've set up Apache on Ubuntu and I can access files I ...
Alx Mx's user avatar
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1 answer
1k views

How to get gcc installed on CoreOS hostmachine rather than the containers running inside it

I have an external monitoring tool that connects over ssh periodically and checks the various system params of a linux box (cpu, mem, etc.). However this approach does not work with CoreOS since it ...
Mindaugas Bernatavičius's user avatar
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1 answer
688 views

How to mount a Kerberized NFS filesystem in CoreOS?

I'm trying to define a systemd mount using cloud-config.yml so that CoreOS mounts a kerberized file system at startup. The filesystem provider has handed me the krb5.conf and krb5.keytab which I ...
Daniel Cerecedo's user avatar
0 votes
1 answer
525 views

coreos: Why is there no default swap partition?

The standard install of coreos seems to come without a defined swap partition and swap setup. What is the reason for that? Would it be recommended do add swap space in coreos node, which works as ...
Mandragor's user avatar
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0 answers
516 views

CoreOS / rkt / systemd - how to access low-numbered ports?

[originally asked at Stack Overflow but put on hold there with the suggestion that I ask here.] I have a web app, written in go, which accepts traffic on ports 80 and 443. It works fine if I: copy ...
AlpineCarver's user avatar
0 votes
2 answers
351 views

Create user on kubernetes

How can I create additional user on Kubernetes so that he/she can access Kubernetes cluster both from web-ui and CLI (kubectl) and allow that user to administrate a specific namespace?
Ferdous Shibly's user avatar
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1 answer
283 views

coreos etcd config using ignition

I'm trying to boot coreos on my private cloud using pxe boot using coreos official document. The process requires ignition file for cloud config, but I can't find a way to set some configuration tags ...
Mohammad Karimi's user avatar
0 votes
1 answer
550 views

Kubernetes hosted service connection timeouts

I have a service running inside Kubernetes proxied by multiple nginx pods that do SSL termination and basic authentication. I am seeing connection timeouts to the endpoint on a subset of traffic. I ...
Tanner's user avatar
  • 143
0 votes
1 answer
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kdump isnt working on redhat machines

How to force Linux to crash: we installed the kexec-tools (kdump) on our redhat machines ( version 7.1 ) in order to capture problems by creating core file under /var/crash folder we check that ...
dandan's user avatar
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0 votes
1 answer
884 views

coreOS: force cloud-config to run update-ca-certificates before docker.service

I'm trying to get coreOS to run update-ca-certificates before docker is started. It is also fine if update-ca-certificatesruns and then docker is immediately restarted afterwards. I've created a new ...
Franchu's user avatar
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