TLS for DRBD Replication Problem #634

euh2 · 2024-03-29T21:56:57Z

euh2
Mar 29, 2024

I have some strange issues when enabling TLS for DRBD Replication. Without it everything works fine.

First, the most annoying and non-informative excerpt from dmesg -wH:

[  +0.002960] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knstorageo1-REDACTED-6def: conn( Disconnecting -> StandAlone ) [disconnected]
[  +0.566138] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: conn( Unconnected -> Connecting ) [connecting]
[  +0.448006] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8: State change failed: State change requires a connection (-15)
[  +0.003535] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knstorageo1-REDACTED-6def: Failed: conn( StandAlone -> Connecting ) [connecting]
[  +0.003841] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knstorageo1-REDACTEDc-6def: Terminating receiver thread
[  +0.003267] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knstorageo1-REDACTED-6def: Terminating sender thread
[  +0.033623] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: conn( Connecting -> Disconnecting ) [down]
[  +0.012246] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: Terminating sender thread
[  +0.003478] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: Starting sender thread (from drbd_r_pvc-f854 [110790])
[  +0.024050] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: meta connection shut down by peer.
[  +0.003147] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 tcp:knwkx-REDACTED-a3f9: unhandled state 5
[  +0.002934] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: meta connection shut down by peer.
[  +0.003160] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: meta connection shut down by peer.
[  +0.003500] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: Connection closed
[  +0.002748] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: conn( Disconnecting -> StandAlone ) [disconnected]
[  +1.020472] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8: State change failed: State change requires a connection (-15)
[  +0.003422] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: Failed: conn( StandAlone -> Connecting ) [connecting]
[  +0.003609] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: Terminating receiver thread
[  +0.003096] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 knwkx-REDACTED-a3f9: Terminating sender thread
[  +0.061875] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8: Terminating worker thread

The TLS Connections between the Nodes look OK. All Nodes connect through public IPs in a /24 range. The first two Bytes of the IP Address below are therefore replaced with 1.2.. They are in different (public) subnets, if that has anything to say.

> k logs -l app.kubernetes.io/component=linstor-satellite -c ktls-utils
tlshd[845]: add_key: Bad message
tlshd[844]: add_key: Bad message
tlshd[844]: Handshake with knstorageo1-REDACTED-6def (1.2.0.158) was successful
tlshd[845]: Handshake with knstorageo1-REDACTED-6def (1.2.0.158) was successful
tlshd[846]: File /etc/tlshd.d/tls.key: expected mode 600
tlshd[847]: File /etc/tlshd.d/tls.key: expected mode 600
tlshd[847]: add_key: Bad message
tlshd[847]: Handshake with knwhx4-REDACTED-1952 (1.2.8.145) was successful
tlshd[846]: add_key: Bad message
tlshd[846]: Handshake with knwhx4-REDACTED-1952 (1.2.8.145) was successful
tlshd[8]: Built from ktls-utils 0.10 on Oct  4 2023 07:26:06
tlshd[7]: Built from ktls-utils 0.10 on Oct  4 2023 07:26:06
tlshd[7]: Built from ktls-utils 0.10 on Oct  4 2023 07:26:06
tlshd[8]: Built from ktls-utils 0.10 on Oct  4 2023 07:26:06
tlshd[848]: add_key: Bad message
tlshd[847]: add_key: Bad message
tlshd[847]: Handshake with knwhx4-REDACTED-1952 (1.2.8.145) was successful
tlshd[848]: Handshake with knwhx4-REDACTED-1952 (1.2.8.145) was successful
tlshd[849]: File /etc/tlshd.d/tls.key: expected mode 600
tlshd[850]: File /etc/tlshd.d/tls.key: expected mode 600
tlshd[849]: add_key: Bad message
tlshd[849]: Handshake with knwkx-REDACTED-a3f9 (1.2.0.168) was successful
tlshd[850]: add_key: Bad message
tlshd[850]: Handshake with knwkx-REDACTED-a3f9 (1.2.0.168) was successful
tlshd[1218]: add_key: Bad message
tlshd[1218]: Handshake with knstorageo1-REDACTED-6def (1.2.0.158) was successful
tlshd[1219]: add_key: Bad message
tlshd[1219]: Handshake with knstorageo1-REDACTED-6def (1.2.0.158) was successful
tlshd[1220]: File /etc/tlshd.d/tls.key: expected mode 600
tlshd[1221]: File /etc/tlshd.d/tls.key: expected mode 600
tlshd[1220]: add_key: Bad message
tlshd[1220]: Handshake with knwkx-REDACTED-a3f9 (1.2.0.168) was successful
tlshd[1221]: add_key: Bad message
tlshd[1221]: Handshake with knwkx-REDACTED-a3f9 (1.2.0.168) was successful
tlshd[7]: Built from ktls-utils 0.10 on Oct  4 2023 07:26:06

The underlying infrastructure is Cilium as CNI on Openstack. I'm unsure if that matters.

The three Nodes involved above are:

knwkx-REDACTED-a3f9 (1.2.0.168)
knstorageo1-REDACTED-6def (1.2.0.158)
knwhx4-REDACTED-1952 (1.2.8.145)

The LinstorCluster Resource:

> k get linstorclusters.piraeus.io linstorcluster -o yaml
apiVersion: piraeus.io/v1
kind: LinstorCluster
metadata:
  annotations:
    # ...
  name: linstorcluster
  # ...
spec:
  internalTLS:
    certManager:
      kind: Issuer
      name: linstor-internal-ca
  linstorPassphraseSecret: linstor-passphrase
  nodeAffinity:
    nodeSelectorTerms:
    - matchExpressions:
      - key: topology.kubernetes.io/zone
        operator: In
        values:
        - zone-12
        - zone-18
      - key: node-role.kubernetes.io/control-plane
        operator: DoesNotExist
      - key: node-role.kubernetes.io/ingress
        operator: DoesNotExist

And the relevant LinstorSatelliteConfiguration:

> k get linstorsatelliteconfigurations.piraeus.io internal-tls -o yaml
apiVersion: piraeus.io/v1
kind: LinstorSatelliteConfiguration
metadata:
  annotations:
    # ...
  name: internal-tls
spec:
  internalTLS:
    certManager:
      kind: Issuer
      name: linstor-internal-ca
    tlsHandshakeDaemon: true

This is probably too little Information, but maybe someone knows where else to look for more debugging information. Thankful for any hints!

Happy Easter Holidays!

Answered by WanzenBug

Apr 2, 2024

MSG_SPLICE_PAGES was added in the 6.5 release, so everything newer will have the needed commits.

View full answer

euh2 · 2024-03-30T10:55:35Z

euh2
Mar 30, 2024
Author

Some more debugging Info (from a different pvc, but still the same issue):

> k describe pvc cluster-example-1
Name:          cluster-example-1
Namespace:     piraeus-datastore
StorageClass:  local
Status:        Bound
Volume:        pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df
Labels:        cnpg.io/cluster=cluster-example
               cnpg.io/instanceName=cluster-example-1
               cnpg.io/pvcRole=PG_DATA
Annotations:   cnpg.io/nodeSerial: 1
               cnpg.io/operatorVersion: 1.22.2
               cnpg.io/pvcStatus: initializing
               pv.kubernetes.io/bind-completed: yes
               pv.kubernetes.io/bound-by-controller: yes
               volume.beta.kubernetes.io/storage-provisioner: linstor.csi.linbit.com
               volume.kubernetes.io/selected-node: knwhx4-REDACTED-1952
               volume.kubernetes.io/storage-provisioner: linstor.csi.linbit.com
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      1Gi
Access Modes:  RWO
VolumeMode:    Filesystem
Used By:       cluster-example-1-initdb-7xbzj
Events:
  Type     Reason                   Age                    From                                                                                                 Message
  ----     ------                   ----                   ----                                                                                                 -------
  Normal   WaitForFirstConsumer     4m39s                  persistentvolume-controller                                                                          waiting for first consumer to be created before binding
  Normal   Provisioning             4m39s                  linstor.csi.linbit.com_linstor-csi-controller-549fbc4f96-bl5k6_327f26d4-f1b2-42c5-a542-1d24ab62d2a0  External provisioner is provisioning volume for claim "piraeus-datastore/cluster-example-1"
  Normal   ExternalProvisioning     4m25s (x2 over 4m39s)  persistentvolume-controller                                                                          Waiting for a volume to be created either by the external provisioner 'linstor.csi.linbit.com' or manually by the system administrator. If volume creation is delayed, please verify that the provisioner is running and correctly registered.
  Normal   ProvisioningSucceeded    4m21s                  linstor.csi.linbit.com_linstor-csi-controller-549fbc4f96-bl5k6_327f26d4-f1b2-42c5-a542-1d24ab62d2a0  Successfully provisioned volume pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df
  Warning  VolumeConditionAbnormal  35s                    csi-pv-monitor-controller-linstor.csi.linbit.com                                                     Resource with issues on node(s): knstorageo1-REDACTED-6def,knwhx4-REDACTED-1952,knwkx-REDACTED-a3f9

Logs from the selected node (knwhx4-REDACTED-1952):

> k logs linstor-csi-node-96gqb | tail -n4
time="2024-03-30T09:22:26Z" level=info msg="mounting volume" blockAccessMode=false filesystem=ext4 linstorCSIComponent=client mountOpts="[_netdev]" source=/dev/drbd1000 target="/var/lib/kubelet/pods/67c79514-0007-4904-886b-c7bbc552e8f6/volumes/kubernetes.io~csi/pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df/mount"
time="2024-03-30T09:22:26Z" level=error msg="method failed" error="rpc error: code = Internal desc = NodePublishVolume failed for pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df: failed to set source device readwrite: exit status 1" linstorCSIComponent=driver method=/csi.v1.Node/NodePublishVolume nodeID=knwhx4-REDACTED-1952 provisioner=linstor.csi.linbit.com req="volume_id:\"pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df\" target_path:\"/var/lib/kubelet/pods/67c79514-0007-4904-886b-c7bbc552e8f6/volumes/kubernetes.io~csi/pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df/mount\" volume_capability:<mount:<fs_type:\"ext4\" > access_mode:<mode:SINGLE_NODE_WRITER > > volume_context:<key:\"csi.storage.k8s.io/ephemeral\" value:\"false\" > volume_context:<key:\"csi.storage.k8s.io/pod.name\" value:\"cluster-example-1-initdb-7xbzj\" > volume_context:<key:\"csi.storage.k8s.io/pod.namespace\" value:\"piraeus-datastore\" > volume_context:<key:\"csi.storage.k8s.io/pod.uid\" value:\"67c79514-0007-4904-886b-c7bbc552e8f6\" > volume_context:<key:\"csi.storage.k8s.io/serviceAccount.name\" value:\"cluster-example\" > volume_context:<key:\"linstor.csi.linbit.com/mount-options\" value:\"\" > volume_context:<key:\"linstor.csi.linbit.com/post-mount-xfs-opts\" value:\"\" > volume_context:<key:\"linstor.csi.linbit.com/remote-access-policy\" value:\"- fromSame:\\n    - topology.kubernetes.io/zone\\n\" > volume_context:<key:\"linstor.csi.linbit.com/uses-volume-context\" value:\"true\" > volume_context:<key:\"storage.kubernetes.io/csiProvisionerIdentity\" value:\"1711757580743-509-linstor.csi.linbit.com\" > " resp="<nil>" version=v1.4.0-e304077f62b6861f0e093184300843913c8a8c02
time="2024-03-30T09:24:28Z" level=info msg="mounting volume" blockAccessMode=false filesystem=ext4 linstorCSIComponent=client mountOpts="[_netdev]" source=/dev/drbd1000 target="/var/lib/kubelet/pods/67c79514-0007-4904-886b-c7bbc552e8f6/volumes/kubernetes.io~csi/pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df/mount"
time="2024-03-30T09:24:28Z" level=error msg="method failed" error="rpc error: code = Internal desc = NodePublishVolume failed for pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df: failed to set source device readwrite: exit status 1" linstorCSIComponent=driver method=/csi.v1.Node/NodePublishVolume nodeID=knwhx4-REDACTED-1952 provisioner=linstor.csi.linbit.com req="volume_id:\"pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df\" target_path:\"/var/lib/kubelet/pods/67c79514-0007-4904-886b-c7bbc552e8f6/volumes/kubernetes.io~csi/pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df/mount\" volume_capability:<mount:<fs_type:\"ext4\" > access_mode:<mode:SINGLE_NODE_WRITER > > volume_context:<key:\"csi.storage.k8s.io/ephemeral\" value:\"false\" > volume_context:<key:\"csi.storage.k8s.io/pod.name\" value:\"cluster-example-1-initdb-7xbzj\" > volume_context:<key:\"csi.storage.k8s.io/pod.namespace\" value:\"piraeus-datastore\" > volume_context:<key:\"csi.storage.k8s.io/pod.uid\" value:\"67c79514-0007-4904-886b-c7bbc552e8f6\" > volume_context:<key:\"csi.storage.k8s.io/serviceAccount.name\" value:\"cluster-example\" > volume_context:<key:\"linstor.csi.linbit.com/mount-options\" value:\"\" > volume_context:<key:\"linstor.csi.linbit.com/post-mount-xfs-opts\" value:\"\" > volume_context:<key:\"linstor.csi.linbit.com/remote-access-policy\" value:\"- fromSame:\\n    - topology.kubernetes.io/zone\\n\" > volume_context:<key:\"linstor.csi.linbit.com/uses-volume-context\" value:\"true\" > volume_context:<key:\"storage.kubernetes.io/csiProvisionerIdentity\" value:\"1711757580743-509-linstor.csi.linbit.com\" > " resp="<nil>" version=v1.4.0-e304077f62b6861f0e093184300843913c8a8c02

The part which sounds like an error is:

error="rpc error: code = Internal desc = NodePublishVolume failed for pvc-ac1edc5f-8b3a-489e-81f4-2430780d76df: failed to set source device readwrite: exit status 1"

I would expect to find some error about TLS, since enabling it causes this issue.

The StorageClass definition:

> k get sc local -o yaml
allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  annotations:
    # ...
  name: local
  # ...
parameters:
  csi.storage.k8s.io/fstype: ext4
  linstor.csi.linbit.com/allowRemoteVolumeAccess: |
    - fromSame:
      - topology.kubernetes.io/zone
  linstor.csi.linbit.com/autoPlace: "3"
  linstor.csi.linbit.com/replicasOnSame: topology.kubernetes.io/zone
  linstor.csi.linbit.com/storagePool: local
  property.linstor.csi.linbit.com/DrbdOptions/Net/tls: "yes"
provisioner: linstor.csi.linbit.com
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer

Some linstor cli output:
(again different pvc, but still same issue. I delete and recreate my example pvc for testing and debugging)

> lins r l -p
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ResourceName                             | Node                     | Port | Usage  | Conns                                                                 |    State | CreatedOn           |
|==============================================================================================================================================================================================|
| pvc-7e4076a9-3687-4668-953b-16f2fa4bffc1 | knstorageo1-REDACTED-6def | 7000 | Unused | Unconnected(knwhx4-REDACTED-1952,knwkx-REDACTED-a3f9)                   | UpToDate | 2024-03-30 10:21:58 |
| pvc-7e4076a9-3687-4668-953b-16f2fa4bffc1 | knwhx4-REDACTED-1952      | 7000 | Unused | Connecting(knwkx-REDACTED-a3f9),Unconnected(knstorageo1-REDACTED-6def)  | UpToDate | 2024-03-30 10:21:56 |
| pvc-7e4076a9-3687-4668-953b-16f2fa4bffc1 | knwkx-REDACTED-a3f9       | 7000 | Unused | Connecting(knwhx4-REDACTED-1952),Unconnected(knstorageo1-REDACTED-6def) | UpToDate | 2024-03-30 10:21:58 |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

root@knwhx4-REDACTED-1952:~# drbdadm status
pvc-7e4076a9-3687-4668-953b-16f2fa4bffc1 role:Secondary suspended:quorum
  disk:UpToDate quorum:no blocked:upper
  knstorageo1-REDACTED-6def connection:Unconnected
  knwkx-REDACTED-a3f9 connection:NetworkFailure

root@knstorageo1-REDACTED-6def:~# drbdadm status
pvc-7e4076a9-3687-4668-953b-16f2fa4bffc1 role:Secondary suspended:quorum
  disk:UpToDate quorum:no blocked:upper
  knwhx4-REDACTED-1952 connection:Unconnected
  knwkx-REDACTED-a3f9 connection:Unconnected

root@knwkx-REDACTED-a3f9:~# drbdadm status
pvc-7e4076a9-3687-4668-953b-16f2fa4bffc1 role:Secondary suspended:quorum
  disk:UpToDate quorum:no blocked:upper
  knstorageo1-REDACTED-6def connection:Unconnected
  knwhx4-REDACTED-1952 connection:NetworkFailure

As soon as I recreate the StorageClass without property.linstor.csi.linbit.com/DrbdOptions/Net/tls: "yes", everything is working as expected:

> lins r l -p
+------------------------------------------------------------------------------------------------------------------------------+
| ResourceName                             | Node                     | Port | Usage  | Conns |    State | CreatedOn           |
|==============================================================================================================================|
| pvc-bf7e2808-d072-47be-9d20-4ca3065539cb | knstorageo1-REDACTED-6def | 7001 | Unused | Ok    | UpToDate | 2024-03-30 10:42:31 |
| pvc-bf7e2808-d072-47be-9d20-4ca3065539cb | knwhx4-REDACTED-1952      | 7001 | InUse  | Ok    | UpToDate | 2024-03-30 10:42:30 |
| pvc-bf7e2808-d072-47be-9d20-4ca3065539cb | knwkx-REDACTED-a3f9       | 7001 | Unused | Ok    | UpToDate | 2024-03-30 10:42:31 |
+------------------------------------------------------------------------------------------------------------------------------+

root@knwhx4-REDACTED-1952:~# drbdadm status
pvc-bf7e2808-d072-47be-9d20-4ca3065539cb role:Primary
  disk:UpToDate
  knstorageo1-REDACTED-6def role:Secondary
    peer-disk:UpToDate
  knwkx-REDACTED-a3f9 role:Secondary
    peer-disk:UpToDate

Where else can I look for debugging info?

0 replies

euh2 · 2024-03-30T15:26:03Z

euh2
Mar 30, 2024
Author

Probably relevant: When TLS is disabled in the StorageClass, the TCP Connections from DRBD show up.

root@knwkx-REDACTED-a3f9:~# ss -tpa | rg '700.'
ESTAB      0      0               1.2.0.168:58929           1.2.0.61:7001
ESTAB      0      0               1.2.0.168:7001            1.2.0.61:56581
ESTAB      0      0               1.2.0.168:59597           1.2.0.61:7002
ESTAB      0      0               1.2.0.168:7002           1.2.0.158:33055
ESTAB      0      0               1.2.0.168:47537          1.2.0.158:7002
ESTAB      0      0               1.2.0.168:7002            1.2.0.61:59779
ESTAB      0      0               1.2.0.168:50395          1.2.0.158:7001
ESTAB      0      0               1.2.0.168:7001           1.2.0.158:34061

When enabling TLS, no TCP Connections in the '700.' range show up.

0 replies

WanzenBug · 2024-04-02T06:00:16Z

WanzenBug
Apr 2, 2024
Maintainer

What version of DRBD are you using (check cat /proc/drbd)? The main thing to look at is the kernel log. There, it would be nice to have the full log for one DRBD+TLS resource.

From the short excerpt, I can see a

[  +0.003147] drbd pvc-f8545fef-1120-4db6-868a-a2f06c8be1f8 tcp:knwkx-REDACTED-a3f9: unhandled state 5

Which means a DRBD version < 9.2.8, as I believe this bug has been fixed since.

10 replies

euh2 Apr 2, 2024
Author

I know little about kTLS. And some searches show that ktls-utils is not available in Debian 12 Bookworm. But available in later releases.
I will try to install it and see what happens.

WanzenBug Apr 2, 2024
Maintainer

So the issue is that the kernel includes this commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/include/linux/socket.h?h=linux-6.1.y&id=6bcc79a4e76072b89541a62eeb41e22b281a365f

It declares the MSG_SPLICE_PAGES constant. But the kernel does not include the commit enables usage of it in sock_sendmsg. So DRBD will call sock_sendmsg(..., MSG_SPLICE_PAGES), but then the TLS implementation says this is not supported.

I guess a newer kernel, which does not contain this half-baked back-port will fix the issue.

euh2 Apr 2, 2024
Author

I see. Do you know about which kernel version would work? With Debian Backports I could get to 6.6.13. I will try that out.

WanzenBug Apr 2, 2024
Maintainer

MSG_SPLICE_PAGES was added in the 6.5 release, so everything newer will have the needed commits.

Answer selected by euh2

euh2 Apr 5, 2024
Author

That works! Thank you!

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TLS for DRBD Replication Problem #634

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