lvm-driver

Chainguard Container for lvm-driver

Dynamically provision Stateful Persistent Node-Local Volumes & Filesystems for Kubernetes that is integrated with a backend LVM2 data storage stack.

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/lvm-driver:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Usage

IMPORTANT NOTE:

As of now, the upstream helm chart is a version ahead of the lvm-driver app that they use. That is, v1.6.2 version of the helm chart while the appVersion is v1.6.1 while v1.6.1 of helm chart has been retracted. The upstream discussion can be found here. However our image comes up with v1.6.2 of lvm-driver which brings the change of using OPENEBS_NAMESPACE instead of LVM_NAMESPACE. As a workaround and till upstream fixes chart version with the app, you might have to fix this with an additional step that is described later.

Prerequisites

There are some prerequisites that need to be met before enabling lvm-localpv support in OpenEBS:

1. All the nodes must have LVM2 utils package installed
   • You can install the package using the following command:

     sudo apt-get update && sudo apt-get install lvm2 -y

2. All the nodes must have dm-snapshot Kernel Module loaded - (Device Mapper Snapshot)
   • You can check if the module is loaded using the following command:

     lsmod | grep dm_snapshot

   • If the module is not loaded, you can load it using the following command:

     sudo modprobe dm_snapshot

3. SSH into each worker node and install open-iSCSI:

    sudo apt-get update
    sudo apt-get install -y open-iscsi
    sudo systemctl enable --now iscsid
    sudo systemctl status iscsid

NOTE: The commands above are for Ubuntu, please replace them with the appropriate commands for your OS.

You can find more information on the project repository here.

Installing using Helm

There is an official Helm chart for deploying the OpenEBS with lvm-localpv support enabled.

You can find the chart here.

You can use the following command to install the OpenEBS with lvm-localpv support enabled using Chainguard's image:

Add helm chart

helm repo add openebs https://openebs.github.io/charts
helm repo update

Install OpenEBS with lvm-localpv

helm install openebs --namespace openebs openebs/openebs \
      --set lvm-localpv.enabled="true" \
      --set lvm-localpv.lvmPlugin.image.registry="cgr.dev/" \
      --set lvm-localpv.lvmPlugin.image.repository="chainguard/lvm-driver" \
      --set lvm-localpv.lvmPlugin.image.tag="latest" --create-namespace

Workaround to fix usage of OPENEBS_NAMESPACE discussed earlier

kubectl edit daemonset openebs-lvm-localpv-node -n openebs

You can then edit the references of LVM_NAMESPACE with OPENEBS_NAMESPACE and then wait for the pods to rollout.

Verify

Once done, you can verify with the below command and logs should look like them:

kubectl logs  openebs-lvm-localpv-node-rdq9w -n openebs -c openebs-lvm-plugin

Here's how logs might appear

I1017 11:31:48.938020       1 main.go:149] LVM Driver Version :- 1.6.2 - commit :- 45e0fbdd6af38f3025132fff5b6d10c3c2eec1fb
I1017 11:31:48.938074       1 main.go:150] DriverName: local.csi.openebs.io Plugin: agent EndPoint: unix:///plugin/csi.sock NodeID: ip-10-0-3-185.us-east-2.compute.internal SetIOLimits: false ContainerRuntime: containerd RIopsPerGB: [] WIopsPerGB: [] RBpsPerGB: [] WBpsPerGB: []
I1017 11:31:48.938098       1 driver.go:49] enabling volume access mode: SINGLE_NODE_WRITER
I1017 11:31:48.938851       1 grpc.go:190] Listening for connections on address: &net.UnixAddr{Name:"//plugin/csi.sock", Net:"unix"}
I1017 11:31:48.939748       1 builder.go:84] Creating event broadcaster
I1017 11:31:48.939848       1 builder.go:90] Creating lvm snapshot controller object
I1017 11:31:48.939880       1 builder.go:99] Adding Event handler functions for lvm snapshot controller
I1017 11:31:48.939897       1 start.go:72] Starting informer for lvm snapshot controller
I1017 11:31:48.939916       1 start.go:74] Starting Lvm snapshot controller
I1017 11:31:48.939929       1 snapshot.go:195] Starting Snap controller
I1017 11:31:48.939937       1 snapshot.go:198] Waiting for informer caches to sync
I1017 11:31:48.940171       1 builder.go:84] Creating event broadcaster
I1017 11:31:48.940327       1 builder.go:90] Creating lvm volume controller object
I1017 11:31:48.940446       1 builder.go:101] Adding Event handler functions for lvm volume controller
I1017 11:31:48.940617       1 start.go:73] Starting informer for lvm volume controller
I1017 11:31:48.940762       1 start.go:75] Starting Lvm volume controller
I1017 11:31:48.940835       1 volume.go:295] Starting Vol controller
I1017 11:31:48.941021       1 volume.go:298] Waiting for informer caches to sync
I1017 11:31:48.963647       1 builder.go:95] Creating lvm node controller object
I1017 11:31:48.968900       1 builder.go:110] Adding Event handler functions for lvm node controller
I1017 11:31:48.970674       1 start.go:98] Starting informer for lvm node controller
I1017 11:31:48.970704       1 start.go:101] Starting Lvm node controller
I1017 11:31:48.970711       1 lvmnode.go:223] Starting Node controller
I1017 11:31:48.970716       1 lvmnode.go:226] Waiting for informer caches to sync
I1017 11:31:49.040068       1 snapshot.go:202] Starting Snap workers
I1017 11:31:49.040111       1 snapshot.go:209] Started Snap workers
I1017 11:31:49.042803       1 volume.go:302] Starting Vol workers
I1017 11:31:49.042996       1 volume.go:309] Started Vol workers
I1017 11:31:49.086469       1 lvmnode.go:231] Starting Node workers
I1017 11:31:49.086494       1 lvmnode.go:238] Started Node workers
I1017 11:31:49.287634       1 lvmnode.go:90] lvm node controller: creating new node object for &{TypeMeta:{Kind: APIVersion:} ObjectMeta:{Name:ip-10-0-3-185.us-east-2.compute.internal GenerateName: Namespace:openebs SelfLink: UID: ResourceVersion: Generation:0 CreationTimestamp:0001-01-01 00:00:00 +0000 UTC DeletionTimestamp:<nil> DeletionGracePeriodSeconds:<nil> Labels:map[] Annotations:map[] OwnerReferences:[{APIVersion:v1 Kind:Node Name:ip-10-0-3-185.us-east-2.compute.internal UID:1294e0df-187f-4ef6-927e-95d8e64e064d Controller:0xc00032f9a6 BlockOwnerDeletion:<nil>}] Finalizers:[] ManagedFields:[]} VolumeGroups:[]}
I1017 11:31:49.299925       1 lvmnode.go:94] lvm node controller: created node object openebs/ip-10-0-3-185.us-east-2.compute.internal
I1017 11:31:49.299952       1 lvmnode.go:306] Successfully synced 'openebs/ip-10-0-3-185.us-east-2.compute.internal'
I1017 11:31:49.301261       1 lvmnode.go:153] Got add event for lvm node openebs/ip-10-0-3-185.us-east-2.compute.internal
I1017 11:31:49.461978       1 grpc.go:72] GRPC call: /csi.v1.Identity/GetPluginInfo requests {}
I1017 11:31:49.463759       1 grpc.go:81] GRPC response: {"name":"local.csi.openebs.io","vendor_version":"1.6.2"}
I1017 11:31:49.477923       1 grpc.go:72] GRPC call: /csi.v1.Node/NodeGetInfo requests {}
I1017 11:31:49.479442       1 lvmnode.go:306] Successfully synced 'openebs/ip-10-0-3-185.us-east-2.compute.internal'
I1017 11:31:49.485697       1 grpc.go:81] GRPC response: {"accessible_topology":{"segments":{"kubernetes.io/hostname":"ip-10-0-3-185.us-east-2.compute.internal","openebs.io/nodename":"ip-10-0-3-185.us-east-2.compute.internal"}},"node_id":"ip-10-0-3-185.us-east-2.compute.internal"}
I1017 11:32:49.267418       1 lvmnode.go:306] Successfully synced 'openebs/ip-10-0-3-185.us-east-2.compute.internal'
I1017 11:33:49.297315       1 lvmnode.go:306] Successfully synced 'openebs/ip-10-0-3-185.us-east-2.compute.internal

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