I've been trying a lot of things from the introductory manual.
I have updated the instructions (on my hardcopy) to the versions
of corosync etc. that I'm using.  I can't get hardly anything to
work reliably beyond the ClusterIP.

So I start over -- I had been reinstalling the machines but I've
grown tired of that.  So, before I start in on my other tales of woe,
I figured I should find out how to start over "according to Hoyle".

When I "start over" I stop all the services, delete the packages,
empty the configs and logs as best I know how.  But this doesn't
completely clear everything:  the drbd metadata is evidently still
on the partitions I've set aside for it.

Oh, before I forget, in particular:
in corosync.conf:
totem {
    interface {
        # This is normally the *network* address of the
        # interface to bind to. This ensures that you can use
        # identical instances of this configuration file
        # across all your cluster nodes, without having to
        # modify this option.
bindnetaddr:  I've tried using an address on ONE of the machines
and I've tried using an address that's on each participating machine,
thus a diff corosync.conf file for each machine (but otherwise identical).
What's the right thing?  From the comment it seems that there should
be one address used among all machines.  But I kept getting messages
about addresses already in use, so I thought I'd try to "fix" it.

This is my burn script.
Am I missing something?  Doing it wrong?

    pkill -9 -f pacemaker
systemctl stop pacemaker.service
systemctl stop corosync.service
systemctl stop pcsd.service
    drbdadm down alpha
    drbdadm down bravo
    drbdadm down delta
systemctl stop drbd.service

    rpm -e drbd84-utils kmod-drbd84
    rpm -e pcs
    rpm -e pacemaker
    rpm -e pacemaker-cluster-libs
    rpm -e pacemaker-cli
    rpm -e pacemaker-libs
    rpm -e pacemaker-doc
    rpm -e lvm2-cluster
    rpm -e     dlm
    rpm -e corosynclib corosync
    cd /var/lib/pacemaker
    rm cib/*
    rm pengine/*
    nullfile /var/log/cluster/corosync.conf
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