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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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 ...
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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 ...
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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 ...
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How to resize a disk on CoreOS with Ignition?

I'm setting up a CoreOS host using the Ignition provision utility to mount an external Block Storage volume (XFS) using Systemd moun at Digital Ocean with Terraform. I figured out how to mount the ...
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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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Can I delete the 'core' user in CoreOS Container Linux?

Pretty simple question: can I delete the core user on CoreOS Container Linux? I've tried deleting core using userdel, which removed it from the /etc/passwd file - however, I can still log in as core ...
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Encrypted external hard drive fails to mount

I have a coreos machine that, as part of its boot process, mounts an encrypted external hard drive. In the past few days, the mount of the external drive has started failing. I'm specifically seeing ...
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1answer
173 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, ...
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ssh login and site is back up online automatically from down state

Facing a unique problem , my stack is asfollow Using docker-compose for 3 containers on CoreOS a) nginx b) mysql c) php-fpm When site goes down as soon as I login through ssh , the site is back ...
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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?
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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 ...
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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 ...
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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/...
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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 ...
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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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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 ...
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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 ...
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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 ...
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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> <...
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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 ...
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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 ...
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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. $ ...
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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 ...
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793 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 ...
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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 (...
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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 ...
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466 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 ...
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1answer
252 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 ...
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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 ...
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429 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 ...
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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 ...
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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 ...
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455 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 (...
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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: "...
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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 ...
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1answer
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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 ...
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1answer
365 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 ...
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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?
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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 ...
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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 ...
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1answer
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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 ...
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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 ...
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1answer
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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. ...
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1answer
223 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 ...
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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 ...
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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 ...
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1answer
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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 ...
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“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 ...
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1answer
818 views

problems configuring etcd2 for TLS

I have at home two CoreOS stable v1122.2.0 machines. both of them are registered at discovery.etcd.io properly. (i see both of them registered at https://ip:2380 when i browse to the discovery url). ...
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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 ...

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