On 2017-09-10 08:33 AM, J Martin Rushton wrote:
> I've been trying to build a model cluster using three virtual machines
> on my home server. Each VM boots off its own dedicated partition
> (CentOS 7.3). One partition is designated to be the common /home
> partition for the VMs, (on the real machine it will mount as /cluster).
> I'm intending to run GFS2 on the shared partition, so I need to
> configure DLM and corosync. That's where I'm getting bogged down.
>
> The VMs and the real machine are bridged onto one ethernet. There is
> another ethernet in the main machine on a different network, but that is
> not used for clustering. The ethernet port is connected to a switch
> which in turn connects to a BT Home Hub 6. All four adresses are
> static, Network Manager is off, ssh works across the nodes without a
> password and ping gives sensible times.
>
> --------------%<-------------------
> # brctl show
> bridge name bridge id STP enabled interfaces
> br3 XXXXXXXXX no enp3s0
> vnet0
> vnet1
> vnet2
> virbr0 XXXXXXXXX yes virbr0-nic
> --------------%<-------------------
>
> When I start corosync each node starts up but does not see the others.
> For instance I see:
>
> --------------%<----------------------
> # corosync-quorumtool
> Quorum information
> ------------------
> Date: Sun Sep 10 12:56:56 2017
> Quorum provider: corosync_votequorum
> Nodes: 1
> Node ID: 3
> Ring ID: 3/28648
> Quorate: No
>
> Votequorum information
> ----------------------
> Expected votes: 4
> Highest expected: 4
> Total votes: 1
> Quorum: 3 Activity blocked
> Flags:
>
> Membership information
> ----------------------
> Nodeid Votes Name
> 3 1 192.168.1.52 (local)
> ----------------%<-------------------
>
> All four nodes are similar, but with different node IDs, IP addresses
> and Ring IDs.
>
> The documentation warns that not all routers will handle multicast
> datagrams correctly. I therefore attempted to force unicast
> communication by making the following changes from the distributed
> corosync.conf:
>
> transport: updu
> cluster_name: <set to the same as the domain>
> # crypto_cipher: none
> # crypto_hash: none
> # mcastaddr: 239.255.1.1
> # mcastport: 5405
> # ttl: 1
>
> The following are unchanged:
>
> version: 2
> secauth: off
> ringnumber: 0
> bindnetaddr: 192.168.1.0
>
> The nodelist is:
>
> ---------%<----------------
> nodelist {
> node {
> ring0_addr: 192.168.1.2
> nodeid: 1
> }
> node {
> ring0_addr: 192.168.1.51
> nodeid: 2
> }
> node {
> ring0_addr: 192.168.1.52
> nodeid: 3
> }
> node {
> ring0_addr: 192.168.1.53
> nodeid: 4
> }
> }
> --------%<------------------
>
> logging and quorum are as supplied.
>
> Any help will be gratefully received.
>
> Regards,
> Martin
You should repost on the Clusterlabs - Users list, it's the most active
HA list and many/most of the devs are there.
http://lists.clusterlabs.org/mailman/listinfo/users
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