Giving error saying “unsupported graph driver: btrfs” in SLES when try to Kubeadm init

问题

I try to install Kuberneties cluster on SLES. But When I do Kubeadm init using below command it gives given error.

Kubeadm init

kubeadm init  --pod-network-cidr=10.244.0.0/16 --kubernetes-version=1.15.3

Error

error execution phase preflight: [preflight] Some fatal errors occurred:
        [ERROR SystemVerification]: unsupported graph driver: btrfs
    [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

In SLES default file system is btrfs. So as per the official docker documentation Get Docker EE for SLES I add below in /etc/docker/daemon.json

{
  "storage-driver": "btrfs"
}

So what would be wrong? Need your kind assistance.

*********************************EDITED*************************************

Docker Status

systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/docker.service.d
           └─flannel.conf
   Active: active (running) since Thu 2019-08-22 17:21:59 CST; 1h 21min ago
     Docs: https://docs.docker.com
 Main PID: 3188 (dockerd)
    Tasks: 24
   Memory: 52.9M
      CPU: 1.723s
   CGroup: /system.slice/docker.service
           └─3188 /usr/bin/dockerd --insecure-registry 192.***.***.***:***

Docker info

Containers: 2
 Running: 0
 Paused: 0
 Stopped: 2
Images: 1
Server Version: 18.09.4
Storage Driver: btrfs
 Build Version: Btrfs v4.9.1
 Library Version: 102
Logging Driver: json-file
Cgroup Driver: cgroupfs

Docker-ee version.

Client:
 Version:           18.09.4
 API version:       1.39
 Go version:        go1.10.6
 Git commit:        c3516c4
 Built:             Wed Mar 27 18:11:35 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Enterprise
 Engine:
  Version:          18.09.4
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.8
  Git commit:       c3516c4
  Built:            Wed Mar 27 18:05:47 2019
  OS/Arch:          linux/amd64
  Experimental:     false

df -Th

/dev/mapper/data_vg-var            btrfs      **G  407M   **G   1% /var
/dev/mapper/data_vg-var_lib        btrfs      **G  232M   **G   1% /var/lib
/dev/mapper/data_vg-var_lib_docker btrfs      **G   17M   **G   1% /var/lib/docker

sudo cat /proc/filesystems | grep btrfs

# sudo cat /proc/filesystems | grep btrfs
    btrfs

Edited /etc/docker/daemon.json as below

{
  "storage-driver": "btrfs"
}

Thank You

回答1:

Errors mostly occures when prerequisites steps from documentation haven't been covered, so please check you have them all:

install Docker EE
btrfs requires a dedicated block device (such as a physical disk), which must be formatted for Btrfs and mounted into /var/lib/docker/
btrfs support must exist in your kernel. To check this, run following command: $ sudo cat /proc/filesystems | grep btrfs
you need the btrfs command. If you do not have this command, install the btrfsprogs package (for SLES)

Then please follow steps from Configure Docker to use the btrfs storage driver section and let me know if problem still exists.

回答2:

Here is the issue.

SLES uses btrfs by default. The docker “overlay” driver is not supported with this file-system, so it is sensible to use etx4 in /var/lib/docker.

Even if we tell Docker about BTRFS :

https://docs.docker.com/storage/storagedriver/btrfs-driver/

Kubeadm will still complain.

So use use etx4 in /var/lib/docker.

来源：https://stackoverflow.com/questions/57589205/giving-error-saying-unsupported-graph-driver-btrfs-in-sles-when-try-to-kubead

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Docker

Kubernetes

sles