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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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Enabled systemd unit is “inactive (dead)” after boot

I'm trying to create a swapfile in a CoreOS, official way (documented here) don't seem to work for me. Thus, I made a custom cloud-config file, as following : #cloud-config coreos: units: - ...
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30 views

Why in CoreOS Kernel parameter sotflockup_panic is activated?

I looked through different Linux distros such as Ubuntu, CentOS, openSUSE, RHEL, PhotonOS, and Alpine for kernel parameter softlockup_panic. In all of them this kernel parameter is deactivated. # ...
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1answer
39 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 ...
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52 views

Build custom Coreos Ami Image

I need create my own ami image of coreos, I have already tried using packer and coreos sdk but, i can't understand in packer case how i build ami image from coreos iso and then upload to aws. Exist ...
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1answer
64 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 ...
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39 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 ...
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8 views

coreos is taking long time to allocate external IP for the services

I'm trying to deploy a sample application to local kubernetes cluster using the tutorial here. $ kubectl get services -o wide NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(...
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44 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> <...
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2answers
661 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 ...
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1answer
230 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 ...
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201 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. $ ...
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1answer
150 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 ...
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1answer
359 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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1answer
3k 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 (...
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1answer
305 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 ...
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1answer
255 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
101 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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2k views

etcd: web ui / dashboard and other modules

I am using etcd2 on latest stable (1409.7.0) CoreOS. I read in git history that until etcd 0.4 there was a modules directory with interesting stuff but that got deprecated. Is there any estimate when ...
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1answer
223 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 ...
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1answer
245 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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1answer
238 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 ...
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315 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 ...
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1answer
382 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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1answer
185 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: "...
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1answer
829 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 ...
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1answer
226 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 ...
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1answer
156 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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2answers
315 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?
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1answer
205 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 ...
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0answers
93 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 ...
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1answer
712 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 ...
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1answer
216 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 ...
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1answer
414 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. ...
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1answer
181 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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0answers
219 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 ...
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1answer
229 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 ...
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1answer
1k 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 ...
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2answers
483 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 ...
2
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1answer
666 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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0answers
333 views

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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1answer
91 views

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 ...
3
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1answer
653 views

Prevent SSH access to instances launched from AWS AMI

We are trying to make a secured AMI for distribution to one of our customers (running Linux/CoreOS). Once our customer deploys our AMI, it is important that they cannot obtain shell access (e.g cannot ...
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0answers
50 views

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=-/...
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0answers
176 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] ...
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1answer
249 views

CoreOS Fleet Vs. Ansible

Maybe this is a stupid question, but I've been working with Ansible, and I just came across CoreOS Fleet. I could be wrong, but Fleet seems to do almost the exact same in terms of just being another ...
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1answer
146 views

Multiple Core-OS clusters with a single etcd cluster?

Is it possible to create different core os clusters all linked up to 1 etcd cluster ? If yes, how ? I have a scenario where I need to create multiple clusters but I want to keep one etcd cluster. ...
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1answer
211 views

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 ...
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1answer
149 views

How do I add a new application container to an existing rkt pod?

How do I add a new application container to an existing rkt pod? The documentation for rkt run shows how to launch multiple applications in a pod using a single command. How might I achieve the same ...
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2answers
328 views

How can I build and install vpnc or similar VPN client in CoreOS? [closed]

How can I build and install vpnc in CoreOS? vpnc is a "Cisco-compatible VPN client" and is available in the Ubuntu Server package repository. As CoreOS doesn't include build tools such as gcc, libc, ...
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1answer
259 views

How to add capabilities to rkt container

I'm very new to rkt (coming from docker). In docker I can add NET_ADMIN capabilities to a container: docker run -d -p 53:53/tcp --cap-add=NET_ADMIN my_image How do I do this in rkt?