o2cb man page on Oracle
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o2cb(8) OCFS2 Manual Pages o2cb(8)
NAME
o2cb - Cluster registration utility for the O2CB cluster stack.
SYNOPSIS
o2cb [--config-file=path] [-h|--help] [-v|--verbose] [-V|--version]
COMMAND [ARGS]
DESCRIPTION
o2cb(8) is used to add, remove and list the information in the O2CB
cluster configuration file. This utility is also used to register and
unregister the cluster, as well as start and stop global heartbeat.
The default location of the configuration file, /etc/ocfs2/clus‐
ter.conf, can be overridden using the --config-file option.
OPTIONS
--config-file config-file
Specify a path to the configuration file. If not provided, it
will use the default path of /etc/ocfs2/cluster.conf.
-v, --verbose
Verbose mode.
-h, --help
Help.
-V, --version
Show version and exit.
O2CB COMMANDS
add-cluster cluster-name
Adds a cluster to the configuration file. The O2CB configuration
file can hold multiple clusters. However, only one cluster can
be active at any time.
remove-cluster cluster-name
Removes a cluster from the configuration file. This command
removes all the nodes and heartbeat regions assigned to the
cluster.
add-node cluster-name node-name [--ip ip-address] [--port port] [--num‐
ber node-number]
Adds a node to the cluster in the configuration file. It accepts
three optional arguments. If not provided, the ip-address
defaults to the one assigned to the node-name, port to 7777, and
node-number to the lowest unused node number.
remove-node cluster-name node-name
Removes a node from the cluster in the configuration file.
add-heartbeat cluster-name [uuid|device]
Adds a heartbeat region to the cluster in the configuration
file.
remove-heartbeat cluster-name [uuid|device]
Removes a heartbeat region from the cluster in the configuration
file.
heartbeat-mode cluster-name [local|global]
Sets the heartbeat mode for the cluster in the configuration
file.
list-clusters
Lists all the cluster names in the configuration file.
list-cluster cluster-name --oneline
Lists all the nodes and heartbeat regions associated with the
cluster in the configuration file.
list-nodes cluster-name --oneline
Lists all the nodes associated with the cluster in the configu‐
ration file.
list-heartbeats cluster-name --oneline
Lists all the heartbeat regions associated with the cluster in
the configuration file.
register-cluster cluster-name
Registers the cluster listed in the configuration file with con‐
figfs. If called when the cluster is already registered, it
will update configfs with the current configuration.
unregister-cluster cluster-name
Unregisters the cluster from configfs.
start-heartbeat cluster-name
Starts global heartbeat on all regions for the cluster as listed
in the configuration file. If repeated, it will start heartbeat
on new regions and stop on regions since removed. It will
silently exit if global heartbeat has not been enabled.
stop-heartbeat cluster-name
Stops global heartbeat on all regions for the cluster. It will
silently exit if global heartbeat has not been enabled.
EXAMPLE
To create a cluster, mycluster having two nodes, node1 and node2, do:
[root@node1 ~]# o2cb add-cluster mycluster
[root@node1 ~]# o2cb add-node mycluster node1 --ip 10.10.10.1
[root@node1 ~]# o2cb add-node mycluster node2 --ip 10.10.10.2
To specify a global heartbeat device, /dev/sda1, do:
[root@node1 ~]# o2cb add-heartbeat mycluster /dev/sda1
To enable global heartbeat, do:
[root@node1 ~]# o2cb heartbeat-mode mycluster global
SEE ALSO
mkfs.ocfs2(8) debugfs.ocfs2(8) fsck.ocfs2(8) tunefs.ocfs2(8)
mounted.ocfs2(8) ocfs2console(8) o2cb(7)
AUTHORS
Oracle Corporation
COPYRIGHT
Copyright © 2010 Oracle. All rights reserved.
Version 1.8.0 September 2010 o2cb(8)
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