David,
Hello,
Im getting crazy about this problem, that I expect to resolve here, with
your help guys:
I have 2 nodes with Corosync redundant ring feature.
Each node has 2 similarly connected/configured NIC's. Both nodes are
connected each other by two crossover cables.
I believe this is root of the problem. Are you using NetworkManager? If
so, have you installed NetworkManager-config-server? If not, please install
it and test again.
I configured both nodes with rrp mode passive. Everything is working well
at this point, but when I shutdown 1 node to test failover, and this
node > returns to be online, corosync is marking the interface as FAULTY
and rrp
I believe it's because with crossover cables configuration when other
side is shutdown, NetworkManager detects it and does ifdown of the
interface. And corosync is unable to handle ifdown properly. Ifdown is bad
with single ring, but it's just killer with RRP (127.0.0.1 poisons every
node in the cluster).
fails to recover the initial state:
1. Initial scenario:
# corosync-cfgtool -s
Printing ring status.
Local node ID 1
RING ID 0
id = 192.168.0.1
status = ring 0 active with no faults
RING ID 1
id = 192.168.1.1
status = ring 1 active with no faults
2. When I shutdown the node 2, all continues with no faults. Sometimes
the
ring ID's are bonding with 127.0.0.1 and then bond back to their
respective
heartbeat IP.
Again, result of ifdown.
3. When node 2 is back online:
# corosync-cfgtool -s
Printing ring status.
Local node ID 1
RING ID 0
id = 192.168.0.1
status = ring 0 active with no faults
RING ID 1
id = 192.168.1.1
status = Marking ringid 1 interface 192.168.1.1 FAULTY
# service corosync status
● corosync.service - Corosync Cluster Engine
Loaded: loaded (/lib/systemd/system/corosync.service; enabled;
vendor
preset: enabled)
Active: active (running) since Wed 2018-08-22 14:44:09 CEST; 1min
38s ago
Docs: man:corosync
man:corosync.conf
man:corosync_overview
Main PID: 1439 (corosync)
Tasks: 2 (limit: 4915)
CGroup: /system.slice/corosync.service
└─1439 /usr/sbin/corosync -f
Aug 22 14:44:11 node1 corosync[1439]: Aug 22 14:44:11 notice [TOTEM ]
The
network interface [192.168.0.1] is now up.
Aug 22 14:44:11 node1 corosync[1439]: [TOTEM ] The network interface
[192.168.0.1] is now up.
Aug 22 14:44:11 node1 corosync[1439]: Aug 22 14:44:11 notice [TOTEM ]
The
network interface [192.168.1.1] is now up.
Aug 22 14:44:11 node1 corosync[1439]: [TOTEM ] The network interface
[192.168.1.1] is now up.
Aug 22 14:44:26 node1 corosync[1439]: Aug 22 14:44:26 notice [TOTEM ] A
new membership (192.168.0.1:601760) was formed. Members
Aug 22 14:44:26 node1 corosync[1439]: [TOTEM ] A new membership (
192.168.0.1:601760) was formed. Members
Aug 22 14:44:32 node1 corosync[1439]: Aug 22 14:44:32 notice [TOTEM ] A
new membership (192.168.0.1:601764) was formed. Members joined: 2
Aug 22 14:44:32 node1 corosync[1439]: [TOTEM ] A new membership (
192.168.0.1:601764) was formed. Members joined: 2
Aug 22 14:44:34 node1 corosync[1439]: Aug 22 14:44:34 error [TOTEM ]
Marking ringid 1 interface 192.168.1.1 FAULTY
Aug 22 14:44:34 node1 corosync[1439]: [TOTEM ] Marking ringid 1
interface
192.168.1.1 FAULTY
If I execute corosync-cfgtool, clears the faulty error but after some
seconds return to be FAULTY.
The only thing that it resolves the problem is to restart de service with
service corosync restart.
Here you have some of my configuration settings on node 1 (I probed
already
to change rrp_mode):
*- corosync.conf*
totem {
version: 2
cluster_name: node
token: 5000
token_retransmits_before_loss_const: 10
secauth: off
threads: 0
rrp_mode: passive
nodeid: 1
interface {
ringnumber: 0
bindnetaddr: 192.168.0.0
#mcastaddr: 226.94.1.1
mcastport: 5405
broadcast: yes
}
interface {
ringnumber: 1
bindnetaddr: 192.168.1.0
#mcastaddr: 226.94.1.2
mcastport: 5407
broadcast: yes
}
}
logging {
fileline: off
to_stderr: yes
to_syslog: yes
to_logfile: yes
logfile: /var/log/corosync/corosync.log
debug: off
timestamp: on
logger_subsys {
subsys: AMF
debug: off
}
}
amf {
mode: disabled
}
quorum {
provider: corosync_votequorum
expected_votes: 2
}
nodelist {
node {
nodeid: 1
ring0_addr: 192.168.0.1
ring1_addr: 192.168.1.1
}
node {
nodeid: 2
ring0_addr: 192.168.0.2
ring1_addr: 192.168.1.2
}
}
aisexec {
user: root
group: root
}
service {
name: pacemaker
ver: 1
}
*- /etc/hosts*
127.0.0.1 localhost
10.4.172.5 node1.upc.edu node1
10.4.172.6 node2.upc.edu node2
So machines have 3 NICs? 2 for corosync/cluster traffic and one for
regular traffic/services/outside world?
Thank you for you help in advance!
To conclude:
- If you are using NetworkManager, try to install
NetworkManager-config-server, it will probably help
- If you are brave enough, try corosync 3.x (current Alpha4 is pretty
stable - actually some other projects gain this stability with SP1 :) )
that has no RRP but uses knet for support redundant links (up-to 8 links
can be configured) and doesn't have problems with ifdown.
Honza
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