[ClusterLabs] Unable to add a node to an existing cluster

[Bartosz Kaczyński]

On 09.08.23 00:18, Xin Liang via Users wrote:
> Hi Bartk,

Hi Jin,

> 
> What's the version of crmsh you are using?

4.5.0

> Could you please provide your corosync.conf on these 2 nodes after you 
> meed this error?
> 
> And, if you run "crm cluster init -u -s <device1> -s <device2> -s 
> <device3>" on node01, crmsh will just pick up ONE interface and write it 
> into corosync.conf, while I see there are TWO rings in 
> https://paste.opensuse.org/pastes/254c28adf1c5 
> <https://paste.opensuse.org/pastes/254c28adf1c5>, which was very weird

Yes, that was part of the demonstration during the mentioned course. The 
cluster was initialized with one ring, and then the second one was added 
during the editing of the corosync.conf configuration file. That's why 
when joining node02, I was asked to provide the addresses of two interfaces.

Just as I mentioned earlier, the reason for the inability to add node02 
to the cluster was the firewall and the blocking of UDP port 5405 for 
the corosync service. Thank you for your message and interest.

Regards,
bartk

> 
> 
> Regards,
> Xin
> ------------------------------------------------------------------------
> *From:* Users <users-bounces at clusterlabs.org> on behalf of Bartosz 
> Kaczyński <bkaczynski at posteo.net>
> *Sent:* Tuesday, August 8, 2023 4:45 AM
> *To:* users at clusterlabs.org <users at clusterlabs.org>
> *Subject:* [ClusterLabs] Unable to add a node to an existing cluster
> Hello ClusterLabs community!
> 
> I'm in the process of learning this technology, using the course "Say
> Goodbye to Downtime with SUSE Linux Enterprise Server (Repeat)" [1]
> where the instructor guides through the process of installing a cluster
> on one node and joining to the cluster on another node.
> 
> The instructor is using SLES 15. The entire test environment is quite
> complex in terms of networking and storage. I think I managed to
> replicate it on openSUSE Leap 15.5.
> 
> I initiated the cluster from node01 with the following command:
> 
> node01:~ # crm cluster init -u \
>       -s /dev/disk/by-path/ip-10.10.11.111:3260-iscsi-iqn.(...)-lun-0 \
>       -s /dev/disk/by-path/ip-10.10.12.112:3260-iscsi-iqn.(...)-lun-0 \
>       -s /dev/disk/by-path/ip-10.10.13.113:3260-iscsi-iqn.(...)-lun-0
> 
>   From node02, I then tried to join it to the cluster with the following
> command [2]
> 
> I also believe that I met all the requirements regarding the network
> connectivity between the nodes and cluster resolution. ICMP is working
> between all interfaces, the /etc/hosts file is also filled in on both
> hosts, and time synchronization is ensured with chronyd.
> 
> The network diagram is available as a downloadable graphic [3], and
> someone has created a similar tutorial using VMware as the hypervisor
> (while I am using KVM) [4].
> 
> I am aware that providing assistance in such a situation can be
> challenging, and the problem may occur at various levels. However, is
> there anything that I might have overlooked, or is there anything that
> comes to your mind?
> 
> [1] https://open.sap.com/courses/suse2-1-pc 
> <https://open.sap.com/courses/suse2-1-pc>
> [2] https://paste.opensuse.org/pastes/254c28adf1c5 
> <https://paste.opensuse.org/pastes/254c28adf1c5>
> [3]
> https://opensap-pinboard.s3.openhpicloud.de/courses/6IB8s3snE8SkA2AxXCJWOL/topics/1nYPUtHIu4f73RLSTHdkqw/44nDvDjlO5bs8eoCxu0Uqh/openSAP-HA-LabEnv-Diagram.png <https://opensap-pinboard.s3.openhpicloud.de/courses/6IB8s3snE8SkA2AxXCJWOL/topics/1nYPUtHIu4f73RLSTHdkqw/44nDvDjlO5bs8eoCxu0Uqh/openSAP-HA-LabEnv-Diagram.png>
> [4]
> https://blogs.sap.com/2021/03/13/setting-up-suse-high-availability-cluster-quick-start-demo/ <https://blogs.sap.com/2021/03/13/setting-up-suse-high-availability-cluster-quick-start-demo/>
> 
> Regards,
> bartk
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