corosync/man/cmap_keys.8

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.TH "CMAP_KEYS" 8 "10/10/2012" "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"

.SH NAME
.P
cmap_keys \- Overview of keys stored in the Configuration Map

.SH OVERVIEW
.P
There are 3 main types of keys stored in CMAP:
.PP
* Mapping of values stored in the config file.
.PP
* Runtime statistics.
.PP
* Other user created values.

In this man page, wild-cards have the usual meaning.

.SH KEYS
.TP
internal_configuration.*
Internal configuration data. All keys in this prefix are read only.
It's only useful for getting a list of loaded services.

.TP
logging.*
Values read from the configuration file. It's possible to change them at runtime.
If subsystem specific configuration is needed, the key must be in the form
logging.logger_subsys.SERVICE.key, where SERVICE is upper case name of the service and
key is same as in the configuration file. All values are of string type.

.TP
nodelist.*
Values read from the configuration file. Each node element in the configuration file gets
assigned it's position starting from zero. So the first node from the config file has
nodelist.node.0. prefix. To be a valid entry, each node must have
.B ring0_addr
key.
To change the
.B nodeid
key, use a u32 data type.

Local node position is stored in
.B local_node_pos
key (RO), so it's easy to find
out nodeid/ring addresses of the local node directly from cmap.

.TP
runtime.blackbox.*
Trigger keys for storing fplay data. It's recommended that you the corosync-blackbox command
to change keys in this prefix.

.TP
runtime.connections.*
There is information about total number of active connections in given moment in the
.B active
key, number of closed connections during whole runtime of corosync in the
.B closed
key and information about each active IPC connection. All keys in this prefix are read-only.

.TP
runtime.connections.ID.*
Each IPC connection has a unique ID. This is in the form [[short_name:][PID:]internal_id. On some
platforms, short_name and PID are not filled and only internal_id is used.

Typical keys in this prefix are:

.B client_pid
containing PID of IPC connection (unavailable on some platforms).

.B dispatched
number of dispatched messages.

.B invalid_request
number of requests made by IPC which are invalid (calling non-existing call, ...).

.B name
contains short name of the IPC connection (unavailable on some platforms).

.B overload
is number of requests which were not processed because of overload.

.B queue_size
contains the number of messages in the queue waiting for send.

.B recv_retries
is the total number of interrupted receives.

.B requests
contains the number of requests made by IPC.

.B responses
is the number of responses sent to the IPC client.

.B send_retries
contains the total number of interrupted sends.

.B service_id
contains the ID of service which the IPC is connected to.

.TP
runtime.config.*
Contains the values actually in use by the totem membership protocol.
Values here are either taken from the Corosync configuration file,
defaults or computed from entries in the config file. For information
on individual keys please refer to the man page
.BR corosync.conf (5).

.TP
runtime.services.*
Prefix with statistics for service engines. Each service has it's own
.B service_id
key in the prefix with the name runtime.services.SERVICE., where SERVICE is the lower case
name of the service. Inside the service prefix is the number of messages received and sent
by the corosync engine in the format runtime.services.SERVICE.EXEC_CALL.rx and
runtime.services.SERVICE.EXEC_CALL.tx, where EXEC_CALL is the internal id of the service
call (so for example 3 in cpg service is receive of multicast message from other
nodes).

.TP
runtime.totem.pg.mrp.srp.*
Prefix containing statistics about totem. All keys here are read only.
Typical key prefixes:

.B commit_entered
Number of times the processor entered COMMIT state.

.B commit_token_lost
Number of times the processor lost token in COMMIT state.

.B consensus_timeouts
How many times the processor timed out forming a consensus about membership.

.B continuous_gather
How many times the processor was not able to reach consensus.

.B firewall_enabled_or_nic_failure
Set to 1 when processor was not able to reach consensus for long time. The usual
reason is a badly configured firewall or connection failure.

.B gather_entered
Number of times the processor entered GATHER state.

.B gather_token_lost
Number of times the processor lost token in GATHER state.

.B mcast_retx
Number of retransmitted messages.

.B mcast_rx
Number of received multicast messages.

.B mcast_tx
Number of transmitted multicast messages.

.B memb_commit_token_rx
Number of received commit tokens.

.B memb_commit_token_tx
Number of transmitted commit tokens.

.B memb_join_rx
Number of received join messages.

.B memb_join_tx
Number of transmitted join messages.

.B memb_merge_detect_rx
Number of received member merge messages.

.B memb_merge_detect_tx
Number of transmitted member merge messages.

.B orf_token_rx
Number of received orf tokens.

.B orf_token_tx
Number of transmitted orf tokens.

.B recovery_entered
Number of times the processor entered recovery.

.B recovery_token_lost
Number of times the token was lost in recovery state.

.B rx_msg_dropped
Number of received messages which were dropped because they were not expected
(as example multicast message in commit state).

.B token_hold_cancel_rx
Number of received token hold cancel messages.

.B token_hold_cancel_tx
Number of transmitted token hold cancel messages.

.B mtt_rx_token
Mean transit time of token in milliseconds. In other words, time between
two consecutive token receives.

.B avg_token_workload
Average time in milliseconds of holding time of token on the current processor.

.B avg_backlog_calc
Average number of not yet sent messages on the current processor.

.TP
runtime.totem.pg.mrp.srp.members.*
Prefix containing members of the totem single ring protocol. Each member
keys has format runtime.totem.pg.mrp.srp.members.NODEID.KEY, where key is
one of:

.B ip
IP address of member. It's stored in format r(RING_ID) ip(IP_ADDRESS).

.B join_count
Number of times the processor joined membership with local cluster. When
processor fails and rejoins again, this value is incremented.

.B status
Status of the processor. Can be one of joined and left.

.B config_version
Config version of the member node.

.TP
runtime.schedmiss.*
If corosync is not scheduled after the required period of time it will
log this event and also write an entry to cmap under following keys:

.B timestamp
The timestamp of the last time when corosync failed to be scheduled
for the required amount of time. The time is milli-seconds since the epoch.

.B delay
The amount of time (milliseconds as a float) that corosync was delayed.

.TP
resources.process.PID.*
Prefix created by applications using SAM with CMAP integration.
It contains the following keys:

.B recovery
Recovery policy of the process. Can be one of quit or restart.

.B poll_period
Value passed in sam_initialize as a time_interval.

.B last_updated
Last time SAM received a heartbeat from the client.

.B state
State of the client. Can be one of failed, stopped, running and waiting for quorum.

.TP
uidgid.*
Information about users/groups which are allowed to make IPC connections to
corosync. Entries loaded from configuration file are stored with
uidgid.config.* prefix and are pruned on configuration file reload. Dynamic
entries has uidgid.* prefix and a configuration file reload doesn't affect them.

.TP
quorum.cancel_wait_for_all
Tells votequorum to cancel waiting for all nodes at cluster startup. Can be used
to unblock quorum if notes are known to be down. For pcs use only.

.TP
config.reload_in_progress
This value will be set to 1 (or created) when a corosync.conf reload is started,
and set to 0 when the reload is completed. This allows interested subsystems
to do atomic reconfiguration rather than changing each key. Note that 
individual add/change/delete notifications will still be sent during a reload.

.TP
config.totemconfig_reload_in_progress
This key is similar to
.B config.totemconfig_reload_in_progress
but changed after the totem config trigger is processed. It is useful (mainly)
for situations when
.B nodelist.local_node_pos
must be correctly reinstated before anything else.

.SH DYNAMIC CHANGE USER/GROUP PERMISSION TO USE COROSYNC IPC
Is the same as in the configuration file. eg: to add UID 500 use

.br
# corosync-cmapctl -s uidgid.uid.500 u8 1

GID is similar, so to add a GID use

.br
# corosync-cmapctl -s uidgid.gid.500 u8 1

For removal of permissions, simply delete the key

.br
# corosync-cmapctl -d uidgid.gid.500

.SH DYNAMIC ADD/REMOVE OF UDPU NODE
Eg. To add the node with address 10.34.38.108
and nodeid 3. This node is called NEW and it's not running corosync yet.

.PP
* Find a node position in the node list which is not used yet. It's recommended that you
use highest_number + 1. Let's say output of corosync-cmapctl looks like:

.br
nodelist.local_node_pos (u32) = 1
.br
nodelist.node.0.nodeid (u32) = 1
.br
nodelist.node.0.ring0_addr (str) = 10.34.38.106
.br
nodelist.node.1.nodeid (u32) = 2
.br
nodelist.node.1.ring0_addr (str) = 10.34.38.107

So next node position will be 2.
.PP
* Add all entries needed for the node on all running nodes, as:

.br
# corosync-cmapctl -s nodelist.node.2.nodeid u32 3
.br
# corosync-cmapctl -s nodelist.node.2.ring0_addr str 10.34.38.108

Always add the ring0_addr key last. The Corosync engine on all nodes should reply
with
.I notice  [TOTEM ] adding new UDPU member {10.34.38.108}
message.
.PP
* Add node information to the configuration file on all nodes so that it
will survive a restart of corosync.
.PP
* Copy and edit configuration file to the NEW node.
.PP
* Start corosync on the NEW node.

Removal of a UDPU node is a very similar, slightly reversed action, so
.PP
* Stop corosync on the OLD node.
.PP
* Remove the relevant entries from cmap on all nodes.
.PP
* Change the configuration file on all nodes.

.SH "SEE ALSO"
.BR corosync_overview (8),
.BR corosync.conf (5),
.BR corosync-cmapctl (8)