Last call to make your voice heard! Our 2022 Developer Survey closes in less than a week. Take survey.

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.

Filter by
Sorted by
Tagged with
2 votes
0 answers
124 views

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 ...
user avatar
1 vote
0 answers
54 views

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, ...
user avatar
  • 111
0 votes
0 answers
141 views

How to backup project in OpenShift 4.6?

In OpenShift 3.11 you could backup project using command 'oc export'. For example oc export all -o yaml > project.yaml In OpenShift or OKD in version 4.6 there is no option export in oc command. ...
user avatar
  • 5,110
2 votes
0 answers
1k views

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 ...
user avatar
1 vote
1 answer
486 views

Systemd: Issue while getting hostname with "%H" unit file parameter in Flatcar OS

I am trying to execute logspout container with the systemd unit file. Ideally logspout container should get the environment value of SYSLOG_HOSTNAME as EC2 instance hostname but it is getting ...
user avatar
  • 181
3 votes
1 answer
2k views

Reason for EXT4 file system corruption of Hyper-V guest

We had our second corruption of an ext4 partition in a relatively short time and ext4 is supposedly very reliable. As this is a virtual machine and the host providing the resources saw no disk errors ...
user avatar
0 votes
1 answer
346 views

Using HAProxy in docker with host network

When running HAProxy in a docker container, we can only see (and forward) the original client's IP when running the container with the --net=host option as described here. Our question: Is this ...
user avatar
0 votes
1 answer
141 views

Can I use Ansible systemd module to halt CoreOS system?

I just need a simple playbook or ad-hoc syntax to shutdown a group of CoreOS hosts. Something tells me I may need to use the shell module, which truthfully wouldn't be awful. The proper way to ...
user avatar
  • 900
0 votes
2 answers
125 views

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 ...
user avatar
  • 900
1 vote
0 answers
1k views

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 ...
user avatar
2 votes
1 answer
487 views

CoreOS high RAM usage for tmpfs

I'm using the latest CoreOS AMI (ami-0fc25a0b6bd986d03 details) on a small t2.nano instance. This instance only has 500MB of memory. Unfortunately, CoreOS immediately consumes ~240MB for a tmpfs, ...
user avatar
  • 367
0 votes
1 answer
233 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?
user avatar
  • 173
1 vote
2 answers
117 views

Where to install NSS modules on CoreOS?

I have a custom NSS module that I wrote and I typically install it by copying the library like so... cp libnss_mymodule.so.0 /lib64/ ... then I add my module to the /etc/nsswitch.conf ... $ grep ...
user avatar
  • 204
14 votes
2 answers
886 views

CoreOS: tcpdump mysteriously solves network issue (excessive number of sockets used)

I've got a mystery for you today. We run a small, three node Elasticsearch cluster based on CoreOS (2023.5.0 / Linux 4.19.25-coreos) on Azure. Elasticsearch is run inside a docker container in host ...
user avatar
5 votes
1 answer
1k views

Systemd: how to keep the timer active after reboot?

I need to setup daily reboot of CoreOS machine. So I have /etc/systemd/system/reboot.service: [Unit] Description=Daily reboot [Service] Type=oneshot ExecStart=/usr/bin/sh -c 'reboot' ...and /etc/...
user avatar
  • 173
0 votes
1 answer
433 views

Disable CoreOS cloudinit

I wanted to try CoreOS for a new vServer. So far I like it but made i fatal mistake: I created it by a cloudinit file instead of the newer ignition method and now on every update reboot it resets my ...
user avatar
1 vote
0 answers
156 views

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 ...
user avatar
  • 2,571
0 votes
1 answer
296 views

Coreos bare metal install login failure, some ignition directives ignored

I'm a newbie to coreos, and spent the last few days trying to resolve differences between both the obsolete and new documentation in an attempt to figure out how to install coreos on a bare metal ...
user avatar
  • 1
0 votes
1 answer
311 views

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 ...
user avatar
1 vote
0 answers
250 views

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 ...
user avatar
1 vote
0 answers
83 views

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> <...
user avatar
2 votes
2 answers
2k views

How to configure SSHD on CoreOS after installation?

I've got the CoreOS running and I would like to remove the ability to login using passwords to the sshd. I went through the docs of the CoreOS in here, but I am quite new to the systemd. I went ...
user avatar
  • 286
1 vote
1 answer
397 views

coreos terraform/matchbox doesn't fully install

I am following this tutorial matchbox-with-terraform which has an end goal of running the simple-install example which stands up a coreos machine and copies an ssh key over after. I watch it load ...
user avatar
  • 115
0 votes
0 answers
546 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. $ ...
user avatar
0 votes
1 answer
340 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 ...
user avatar
  • 13
1 vote
1 answer
1k views

When configuring dnsmasq for PXE booting, why do I need to change undionly.kpxe to undionly.0?

I have configured dnsmasq to PXE boot iPXE clients by referring them to a HTTP server (matchbox in this case). I have also configured it to deal with older PXE clients by placing a copy of iPXE in the ...
user avatar
  • 233
4 votes
3 answers
15k views

gcloud SSH connection asks for password instead of passphrase

I've got two VMs set up on Google Cloud Platform. server1 uses an Ubuntu 16.04 image [g1-small (1 vCPU, 1.7 GB memory)]; and the newly created VM, called server2, uses a CoreOS Stable image [f1-micro (...
user avatar
  • 181
0 votes
1 answer
877 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 ...
user avatar
0 votes
1 answer
593 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 ...
user avatar
2 votes
1 answer
340 views

Communication to containers not always possible

I have a couple of services running in a docker swarm on a single docker host. All services run in the same overlay network. These services all expose a different port on which a web server is ...
user avatar
  • 71
0 votes
1 answer
457 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 ...
user avatar
  • 221
0 votes
1 answer
605 views

How much server RAM docker-machine instance needs? [duplicate]

I have a docker installed at OS X and using docker-machine with my host provider server. The server OS is CoreOS, I have 3 lightweight sites with NGINX, Mongo and MySQL instances. Sometimes sites down ...
user avatar
0 votes
1 answer
420 views

How to pass an ignition.json to a Xen CoreOS DOMU when using libvirt or `xl`

I have a baremetal server with Xen, and Debian 9 as DOM0. This server has libvirt, and I can happily create PV domains by using xl, virsh or remotely using virt-manager. I want to streamline coreos ...
user avatar
  • 430
0 votes
0 answers
454 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 ...
user avatar
2 votes
1 answer
476 views

CoreOS 1353.4.0 - How should I configure Ignition for an etcd cluster member with dynamic discovery?

Using CoreOS 1353.4.0, on DigitalOcean, how should I write an Ignition config for a machine that is to join an etcd cluster with dynamic discovery? I've written the following Ignition config (...
user avatar
  • 2,075
0 votes
1 answer
1k views

Found unexpected end of stream cloud-config

So this is my cloud-config #cloud-config coreos: etcd2: discovery: "https://discovery.etcd.io/tocken" advertise-client-urls: "http://$private_ipv4:2379" initial-advertise-peer-urls: "...
user avatar
1 vote
1 answer
2k views

gcloud: docker pull says "authentication required" after successful login

I have VM with CoreOS in Compute engine and image inside Container Registry. I'm following this instruction https://cloud.google.com/container-registry/docs/advanced-authentication and run $ docker ...
user avatar
  • 141
2 votes
1 answer
461 views

Changing the update strategy on a CoreOS machine with a maintenance window

I want to change the update strategy on a running CoreOS machine with a maintenance window described here, which is different what was asked before in a similar direction. It is clear to me that ...
user avatar
1 vote
1 answer
534 views

Systemd units: [Install] vs. command: start (cloud-config)

I'm configuring systemd in a cloud-config file for CoreOS. If I understand this correctly, I have two ways of starting a unit at boot: Alternative 1, use the [Install]-section (as described in ...
user avatar
  • 143
0 votes
2 answers
349 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?
user avatar
0 votes
1 answer
259 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 ...
user avatar
1 vote
0 answers
161 views

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 ...
user avatar
1 vote
1 answer
2k views

pxe-e32 open timeout error

I'm trying to boot CoreOS on hp dl360 bare metal server. I've configured my PXE server similar to this link. Besides, My DHCP server is running on Cisco switch and I set next-server option to my PXE ...
user avatar
0 votes
1 answer
344 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 ...
user avatar
  • 143
1 vote
1 answer
507 views

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. ...
user avatar
  • 4,078
1 vote
1 answer
237 views

How to setup a docker container networking on CoreOS?

I have a single bare metal machine running CoreOS and a bunch of Docker containers, e.g.nginx and gitlab. nginx should be a reverse proxy for gitlab so it needs to have network connectivity and ...
user avatar
1 vote
0 answers
345 views

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 ...
user avatar
  • 147
1 vote
1 answer
537 views

Can't get any external traffic on EC2 instances second elastic IP

I have an EC2 instance running CoreOS 1068.9.0. This server is running a very simple Hello World HTTP server. > curl http://52.43.128.34/ Hello, world! I have an elastic IP assigned to a network ...
user avatar
  • 111
0 votes
1 answer
2k views

kubelet service with etcd2-tls can't connect to 127.0.0.1:8080 - getsockopt: connection refused

I have CoreOS stable v1122.2.0 installed. I have etcd2 configured with tls and is working properly. i created the certificates based on https://github.com/coreos/etcd/tree/master/hack/tls-setup ...
user avatar
  • 313
1 vote
2 answers
859 views

"EtcdException: Could not get the list of servers" while running calico rkt container on coreos

I have two coreos stable v1122.2.0 machines, each one with etcd2 configured with tls. I created the certificates using https://github.com/coreos/etcd/tree/master/hack/tls-setup. now I'm trying to ...
user avatar
  • 313

1
2 3 4 5