neeraj ch napsal(a):
Hello ,
We are testing out corosync and pacemaker for DB high availability on the
cloud. I was able to set up a cluster with in a DC using corosync 1.4 and
pacemaker 1.12. It works great and I wanted to try a cross DC cluster. I
was using unicast as multicast was disabled by default.
I was not sure how Corosync behaves with public IP's but I still went ahead
and tried it with both public IP's as well as DNS names. These DNS names
resolve as local IP when the other node is with in the same subnet.
Every node has to be able to see every other node. So mixing of public
and private ips is not going to work (with exception of special case
where all private ips are in the same network). Also keep in mind config
file has to be same on all nodes.
while I was using public IP's both the node inside the same subnet as well
as outside were unable to connect, except for itself. While using DNS names
the membership information showed the nodes within same subnet being
connected to while the nodes outside were not connected
This is somehow expected.
My corosync config is as follows.
totem {
version: 2
secauth: off
threads: 0
interface {
member {
memberaddr: <public ip>
}
member {
memberaddr: <public ip>
}
member {
memberaddr: <public ip>
}
ringnumber: 0
bindnetaddr: 172.31.0.0
mcastport: 5405
ttl: 1
}
transport: udpu
}
logging {
fileline: off
to_stderr: no
to_logfile: yes
to_syslog: yes
logfile: /var/log/cluster/corosync.log
debug: on
timestamp: on
logger_subsys {
subsys: AMF
debug: on
}
}
service {
# Load the Pacemaker Cluster Resource Manager
name: pacemaker
ver: 1
}
amf {
mode: disabled
}
I am checking membership information by using corosync-objctl. I have also
tried using public ip as the bind address , that makes the membership from
Just to make sure. This "public" ip is really ip of given machine?
1 to 0 as it doesn't add itself.
If any one has any suggestion / advice on how to debug or what I am doing
wrong . Any help would be very appreciated.
Thank you
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