Error starting Openshift Origin on CentOS 7: systemd cgroup driver vs cgroupfs driver

Following the instructions to install the Openshift Origin binary from here,  on first attempt to start it up I got this error:

failed to run Kubelet: failed to create kubelet: 
misconfiguration: kubelet cgroup driver: "systemd" is different from docker cgroup driver: "cgroupfs"

Per instructions in this issue ticket, to verify which cgroup drivers docker is using I used:

$ sudo docker info |grep -i cgroup

Cgroup Driver: cgroupfs

Unfortunately the steps to check the cgroup driver for kubernetes don’t match with my install because I’m guessing the single binary Openshift Origin has it packaged all in one, so there is no corresponding systemd config for it.

This article suggested to configure the cgroups driver for Docker so it matches kubernetes, but it looks like the yum install for docker-ce doesn’t configure systemd for it either.

Ok, to the docs. Per the Docker docs for configuring systemd here, it suggests to pull to preconfigured files from a git repo and place them in /etc/systemd/system

Now I have the systemd files for Docker in place,  this articles says to add this arg to the end of the ExecStart line in docker.service:

--exec-opt native.cgroupdriver=systemd

Now reload my config and restart the docker service:

sudo systemctl daemon-reload
sudo systemctl restart docker

and let’s check again what cgroups driver we’re using with:

$ sudo docker info |grep -i cgroup

Cgroup Driver: systemd

… and now we’ve switched to systemd.

Ok, starting up Openshift again, this issue is resolved, there’s a lot of log output as the server starts up. After opening up the firewall ports for 8443, my Openshift Console is now up!

Getting past Vagrant’s “Authentication failure” error when starting up OpenShift Origin

For getting up and running quickly with OpenShift Origin, RedHat have an all-in-one VM image you can provision with Vagrant. The instructions mention to not use Vagrant 1.8.5 as there’s an issue with the SSH setup – since I already had 1.8.5 installed for some other projects, I tried anyway, and ran into issues with SSH’ing into the VM with SSH keys.

When provisioning the VM, you’ll see:


Kevins-MacBook-Pro:openshift-origin kev$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Checking if box 'openshift/origin-all-in-one' is up to date...
==> default: Resuming suspended VM...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address:
    default: SSH username: vagrant
    default: SSH auth method: private key
    default: Warning: Authentication failure. Retrying...
    default: Warning: Authentication failure. Retrying...

There’s a number of posts discussing this issue and a few workarounds, for example, here and here.

The suggestions relate to switching from the ssh authentication to userid/password, by adding this to your Vagrantfile:

config.ssh.username = "vagrant"
config.ssh.password = "vagrant"

I tried this, and when running vagrant up I had different errors about “SSH authentication failed”. Next I tried adding this recommendation:


config.ssh.insert_key = false

This didn’t make any difference initially, but doing a vagrant destroy, and then trying to bring it up again initially ran into the same issue, I Ctrl-C’d out and tried again and then it worked second time. I’m not sure what steps got past the ssh keys issue, but at this point I was up and running. There’s a long discussion in both the linked threads above that describe the cause of the issue, so if you’re interested take a look through those threads.