ctdb - CTDB management utility

Administrative Commands

These are commands used to monitor and administer a CTDB cluster.

pnn
This command displays the PNN of the current node.

status
This command shows the current status of all CTDB nodes based on information from the queried node.

Note: If the queried node is INACTIVE then the status might not be current.

Nodestatus

This includes the number of physical nodes and the status of each node. See ctdb(7) for information
about node states.

Generation

The generation id is a number that indicates the current generation of a cluster instance. Each time
a cluster goes through a reconfiguration or a recovery its generation id will be changed.

This number does not have any particular meaning other than to keep track of when a cluster has gone
through a recovery. It is a random number that represents the current instance of a ctdb cluster and
its databases. The CTDB daemon uses this number internally to be able to tell when commands to
operate on the cluster and the databases was issued in a different generation of the cluster, to
ensure that commands that operate on the databases will not survive across a cluster database
recovery. After a recovery, all old outstanding commands will automatically become invalid.

Sometimes this number will be shown as "INVALID". This only means that the ctdbd daemon has started
but it has not yet merged with the cluster through a recovery. All nodes start with generation
"INVALID" and are not assigned a real generation id until they have successfully been merged with a
cluster through a recovery.

VirtualNodeNumber(VNN)map

Consists of the number of virtual nodes and mapping from virtual node numbers to physical node
numbers. Only nodes that are participating in the VNN map can become lmaster for database records.

Recoverymode

This is the current recovery mode of the cluster. There are two possible modes:

NORMAL - The cluster is fully operational.

RECOVERY - The cluster databases have all been frozen, pausing all services while the cluster awaits
a recovery process to complete. A recovery process should finish within seconds. If a cluster is
stuck in the RECOVERY state this would indicate a cluster malfunction which needs to be investigated.

Once the leader detects an inconsistency, for example a node becomes disconnected/connected, the
recovery daemon will trigger a cluster recovery process, where all databases are remerged across the
cluster. When this process starts, the leader will first "freeze" all databases to prevent
applications such as samba from accessing the databases and it will also mark the recovery mode as
RECOVERY.

When the CTDB daemon starts up, it will start in RECOVERY mode. Once the node has been merged into a
cluster and all databases have been recovered, the node mode will change into NORMAL mode and the
databases will be "thawed", allowing samba to access the databases again.

Leader

This is the cluster node that is currently designated as the leader. This node is responsible of
monitoring the consistency of the cluster and to perform the actual recovery process when required.

Only one node at a time can be the designated leader. Which node is designated the leader is decided
by an election process in the recovery daemons running on each node.

Example

# ctdb status
Number of nodes:4
pnn:0 192.168.2.200 OK (THIS NODE)
pnn:1 192.168.2.201 OK
pnn:2 192.168.2.202 OK
pnn:3 192.168.2.203 OK
Generation:1362079228
Size:4
hash:0 lmaster:0
hash:1 lmaster:1
hash:2 lmaster:2
hash:3 lmaster:3
Recovery mode:NORMAL (0)
Leader:0

nodestatus[PNN-LIST]
This command is similar to the status command. It displays the "node status" subset of output. The main
differences are:

• The exit code is the bitwise-OR of the flags for each specified node, while ctdbstatus exits with 0
if it was able to retrieve status for all nodes.

• ctdbstatus provides status information for all nodes. ctdbnodestatus defaults to providing status
for only the current node. If PNN-LIST is provided then status is given for the indicated node(s).

A common invocation in scripts is ctdbnodestatusall to check whether all nodes in a cluster are
healthy.

Example

# ctdb nodestatus
pnn:0 10.0.0.30 OK (THIS NODE)

# ctdb nodestatus all
Number of nodes:2
pnn:0 10.0.0.30 OK (THIS NODE)
pnn:1 10.0.0.31 OK

leader
This command shows the pnn of the node which is currently the leader.

Note: If the queried node is INACTIVE then the status might not be current.

uptime
This command shows the uptime for the ctdb daemon. When the last recovery or ip-failover completed and
how long it took. If the "duration" is shown as a negative number, this indicates that there is a
recovery/failover in progress and it started that many seconds ago.

Example

# ctdb uptime
Current time of node : Thu Oct 29 10:38:54 2009
Ctdbd start time : (000 16:54:28) Wed Oct 28 17:44:26 2009
Time of last recovery/failover: (000 16:53:31) Wed Oct 28 17:45:23 2009
Duration of last recovery/failover: 2.248552 seconds

listnodes
This command shows lists the ip addresses of all the nodes in the cluster.

Example

# ctdb listnodes
192.168.2.200
192.168.2.201
192.168.2.202
192.168.2.203

natgw{leader|list|status}
This command shows different aspects of NAT gateway status. For an overview of CTDB's NAT gateway
functionality please see the NAT GATEWAY section in ctdb(7).

leader
Show the PNN and private IP address of the current NAT gateway leader node.

Example output:

1 192.168.2.201

list
List the private IP addresses of nodes in the current NAT gateway group, annotating the leader node.

Example output:

192.168.2.200
192.168.2.201 LEADER
192.168.2.202
192.168.2.203

status
List the nodes in the current NAT gateway group and their status.

Example output:

pnn:0 192.168.2.200 UNHEALTHY (THIS NODE)
pnn:1 192.168.2.201 OK
pnn:2 192.168.2.202 OK
pnn:3 192.168.2.203 OK

ping
This command will "ping" specified CTDB nodes in the cluster to verify that they are running.

Example

# ctdb ping
response from 0 time=0.000054 sec (3 clients)

ifaces
This command will display the list of network interfaces, which could host public addresses, along with
their status.

Example

# ctdb ifaces
Interfaces on node 0
name:eth5 link:up references:2
name:eth4 link:down references:0
name:eth3 link:up references:1
name:eth2 link:up references:1

# ctdb -X ifaces
|Name|LinkStatus|References|
|eth5|1|2|
|eth4|0|0|
|eth3|1|1|
|eth2|1|1|

ip
This command will display the list of public addresses that are provided by the cluster and which
physical node is currently serving this ip. By default this command will ONLY show those public addresses
that are known to the node itself. To see the full list of all public ips across the cluster you must use
"ctdb ip all".

Example

# ctdb ip -v
Public IPs on node 0
172.31.91.82 node[1] active[] available[eth2,eth3] configured[eth2,eth3]
172.31.91.83 node[0] active[eth3] available[eth2,eth3] configured[eth2,eth3]
172.31.91.84 node[1] active[] available[eth2,eth3] configured[eth2,eth3]
172.31.91.85 node[0] active[eth2] available[eth2,eth3] configured[eth2,eth3]
172.31.92.82 node[1] active[] available[eth5] configured[eth4,eth5]
172.31.92.83 node[0] active[eth5] available[eth5] configured[eth4,eth5]
172.31.92.84 node[1] active[] available[eth5] configured[eth4,eth5]
172.31.92.85 node[0] active[eth5] available[eth5] configured[eth4,eth5]

# ctdb -X ip -v
|Public IP|Node|ActiveInterface|AvailableInterfaces|ConfiguredInterfaces|
|172.31.91.82|1||eth2,eth3|eth2,eth3|
|172.31.91.83|0|eth3|eth2,eth3|eth2,eth3|
|172.31.91.84|1||eth2,eth3|eth2,eth3|
|172.31.91.85|0|eth2|eth2,eth3|eth2,eth3|
|172.31.92.82|1||eth5|eth4,eth5|
|172.31.92.83|0|eth5|eth5|eth4,eth5|
|172.31.92.84|1||eth5|eth4,eth5|
|172.31.92.85|0|eth5|eth5|eth4,eth5|

ipinfoIP
This command will display details about the specified public addresses.

Example

# ctdb ipinfo 172.31.92.85
Public IP[172.31.92.85] info on node 0
IP:172.31.92.85
CurrentNode:0
NumInterfaces:2
Interface[1]: Name:eth4 Link:down References:0
Interface[2]: Name:eth5 Link:up References:2 (active)

eventrun|status|scriptlist|scriptenable|scriptdisable
This command is used to control event daemon and to inspect status of various events.

The commands below require a component to be specified. In the current version the only valid component
is legacy.

run TIMEOUTCOMPONENTEVENT [ARGUMENTS]
This command can be used to manually run specified EVENT in COMPONENT with optional ARGUMENTS. The
event will be allowed to run a maximum of TIMEOUT seconds. If TIMEOUT is 0, then there is no time
limit for running the event.

status COMPONENTEVENT
This command displays the last execution status of the specified EVENT in COMPONENT.

The command will terminate with the exit status corresponding to the overall status of event that is
displayed.

The output is the list of event scripts executed. Each line shows the name, status, duration and
start time for each script. Output from each script is shown.

Example #1

# ctdb event status legacy monitor
00.ctdb OK 0.014 Sat Dec 17 19:39:11 2016
01.reclock OK 0.013 Sat Dec 17 19:39:11 2016
05.system OK 0.029 Sat Dec 17 19:39:11 2016
10.interface OK 0.037 Sat Dec 17 19:39:11 2016
11.natgw OK 0.011 Sat Dec 17 19:39:11 2016
11.routing OK 0.007 Sat Dec 17 19:39:11 2016
13.per_ip_routing OK 0.007 Sat Dec 17 19:39:11 2016
20.multipathd OK 0.007 Sat Dec 17 19:39:11 2016
31.clamd OK 0.007 Sat Dec 17 19:39:11 2016
40.vsftpd OK 0.013 Sat Dec 17 19:39:11 2016
41.httpd OK 0.018 Sat Dec 17 19:39:11 2016
49.winbind OK 0.023 Sat Dec 17 19:39:11 2016
50.samba OK 0.100 Sat Dec 17 19:39:12 2016
60.nfs OK 0.376 Sat Dec 17 19:39:12 2016
70.iscsi OK 0.009 Sat Dec 17 19:39:12 2016
91.lvs OK 0.007 Sat Dec 17 19:39:12 2016

Example #2

# ctdb event status legacy monitor
00.ctdb OK 0.011 Sat Dec 17 19:40:46 2016
01.reclock OK 0.010 Sat Dec 17 19:40:46 2016
05.system OK 0.030 Sat Dec 17 19:40:46 2016
10.interface OK 0.041 Sat Dec 17 19:40:46 2016
11.natgw OK 0.008 Sat Dec 17 19:40:46 2016
11.routing OK 0.007 Sat Dec 17 19:40:46 2016
13.per_ip_routing OK 0.007 Sat Dec 17 19:40:46 2016
20.multipathd OK 0.007 Sat Dec 17 19:40:46 2016
31.clamd OK 0.007 Sat Dec 17 19:40:46 2016
40.vsftpd OK 0.013 Sat Dec 17 19:40:46 2016
41.httpd OK 0.015 Sat Dec 17 19:40:46 2016
49.winbind OK 0.022 Sat Dec 17 19:40:46 2016
50.samba ERROR 0.077 Sat Dec 17 19:40:46 2016
OUTPUT: ERROR: samba tcp port 445 is not responding

script list COMPONENT
List the available event scripts in COMPONENT. Enabled scripts are flagged with a '*'.

Generally, event scripts are provided by CTDB. However, local or 3rd party event scripts may also be
available. These are shown in a separate section after those provided by CTDB.

Example

# ctdb event script list legacy
* 00.ctdb
* 01.reclock
* 05.system
* 10.interface
11.natgw
11.routing
13.per_ip_routing
20.multipathd
31.clamd
40.vsftpd
41.httpd
* 49.winbind
* 50.samba
* 60.nfs
70.iscsi
91.lvs

* 02.local

script enable COMPONENTSCRIPT
Enable the specified event SCRIPT in COMPONENT. Only enabled scripts will be executed when running
any event.

script disable COMPONENTSCRIPT
Disable the specified event SCRIPT in COMPONENT. This will prevent the script from executing when
running any event.

scriptstatus
This is an alias for ctdbeventstatuslegacy[EVENT], where EVENT defaults to monitor.

This command is deprecated. It's provided for backward compatibility. Use ctdbeventstatus instead.

listvars
List all tuneable variables, except the values of the obsolete tunables like VacuumMinInterval. The
obsolete tunables can be retrieved only explicitly with the "ctdb getvar" command.

Example

# ctdb listvars
SeqnumInterval = 1000
ControlTimeout = 60
TraverseTimeout = 20
KeepaliveInterval = 5
KeepaliveLimit = 5
RecoverTimeout = 120
RecoverInterval = 1
ElectionTimeout = 3
TakeoverTimeout = 9
MonitorInterval = 15
TickleUpdateInterval = 20
EventScriptTimeout = 30
MonitorTimeoutCount = 20
RecoveryGracePeriod = 120
RecoveryBanPeriod = 300
DatabaseHashSize = 100001
DatabaseMaxDead = 5
RerecoveryTimeout = 10
EnableBans = 1
NoIPFailback = 0
VerboseMemoryNames = 0
RecdPingTimeout = 60
RecdFailCount = 10
LogLatencyMs = 0
RecLockLatencyMs = 1000
RecoveryDropAllIPs = 120
VacuumInterval = 10
VacuumMaxRunTime = 120
RepackLimit = 10000
VacuumFastPathCount = 60
MaxQueueDropMsg = 1000000
AllowUnhealthyDBRead = 0
StatHistoryInterval = 1
DeferredAttachTO = 120
AllowClientDBAttach = 1
RecoverPDBBySeqNum = 1
DeferredRebalanceOnNodeAdd = 300
FetchCollapse = 1
HopcountMakeSticky = 50
StickyDuration = 600
StickyPindown = 200
NoIPTakeover = 0
DBRecordCountWarn = 100000
DBRecordSizeWarn = 10000000
DBSizeWarn = 100000000
PullDBPreallocation = 10485760
LockProcessesPerDB = 200
RecBufferSizeLimit = 1000000
QueueBufferSize = 1024
IPAllocAlgorithm = 2

getvarNAME
Get the runtime value of a tuneable variable.

Example

# ctdb getvar MonitorInterval
MonitorInterval = 15

setvarNAMEVALUE
Set the runtime value of a tuneable variable.

Example

# ctdb setvar MonitorInterval 20

lvs{leader|list|status}
This command shows different aspects of LVS status. For an overview of CTDB's LVS functionality please
see the LVS section in ctdb(7).

leader
Shows the PNN of the current LVS leader node.

Example output:

list
Lists the currently usable LVS nodes.

Example output:

2 10.0.0.13
3 10.0.0.14

status
List the nodes in the current LVS group and their status.

Example output:

pnn:0 10.0.0.11 UNHEALTHY (THIS NODE)
pnn:1 10.0.0.12 UNHEALTHY
pnn:2 10.0.0.13 OK
pnn:3 10.0.0.14 OK

getcapabilities
This command shows the capabilities of the current node. See the CAPABILITIES section in ctdb(7) for more
details.

Example output:

LEADER: YES
LMASTER: YES

statistics
Collect statistics from the CTDB daemon about how many calls it has served. Information about various
fields in statistics can be found in ctdb-statistics(7).

Example

# ctdb statistics
CTDB version 1
Current time of statistics : Tue Mar 8 15:18:51 2016
Statistics collected since : (003 21:31:32) Fri Mar 4 17:47:19 2016
num_clients 9
frozen 0
recovering 0
num_recoveries 2
client_packets_sent 8170534
client_packets_recv 7166132
node_packets_sent 16549998
node_packets_recv 5244418
keepalive_packets_sent 201969
keepalive_packets_recv 201969
node
req_call 26
reply_call 0
req_dmaster 9
reply_dmaster 12
reply_error 0
req_message 1339231
req_control 8177506
reply_control 6831284
client
req_call 15
req_message 334809
req_control 6831308
timeouts
call 0
control 0
traverse 0
locks
num_calls 8
num_current 0
num_pending 0
num_failed 0
total_calls 15
pending_calls 0
childwrite_calls 0
pending_childwrite_calls 0
memory_used 394879
max_hop_count 1
total_ro_delegations 0
total_ro_revokes 0
hop_count_buckets: 8 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0
lock_buckets: 0 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0
locks_latency MIN/AVG/MAX 0.010005/0.010418/0.011010 sec out of 8
reclock_ctdbd MIN/AVG/MAX 0.002538/0.002538/0.002538 sec out of 1
reclock_recd MIN/AVG/MAX 0.000000/0.000000/0.000000 sec out of 0
call_latency MIN/AVG/MAX 0.000044/0.002142/0.011702 sec out of 15
childwrite_latency MIN/AVG/MAX 0.000000/0.000000/0.000000 sec out of 0

statisticsreset
This command is used to clear all statistics counters in a node.

Example: ctdb statisticsreset

dbstatisticsDB
Display statistics about the database DB. Information about various fields in dbstatistics can be found
in ctdb-statistics(7).

Example

# ctdb dbstatistics locking.tdb
DB Statistics: locking.tdb
ro_delegations 0
ro_revokes 0
locks
total 14356
failed 0
current 0
pending 0
hop_count_buckets: 28087 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0
lock_buckets: 0 14188 38 76 32 19 3 0 0 0 0 0 0 0 0 0
locks_latency MIN/AVG/MAX 0.001066/0.012686/4.202292 sec out of 14356
vacuum_latency MIN/AVG/MAX 0.000472/0.002207/15.243570 sec out of 224530
Num Hot Keys: 1
Count:8 Key:ff5bd7cb3ee3822edc1f0000000000000000000000000000

getreclock
Show details of the recovery lock, if any.

Example output:

/clusterfs/.ctdb/recovery.lock

getdebug
Get the current debug level for the node. the debug level controls what information is written to the log
file.

The debug levels are mapped to the corresponding syslog levels. When a debug level is set, only those
messages at that level and higher levels will be printed.

The list of debug levels from highest to lowest are :

ERROR WARNING NOTICE INFO DEBUG

setdebugDEBUGLEVEL
Set the debug level of a node. This controls what information will be logged.

The debuglevel is one of ERROR WARNING NOTICE INFO DEBUG

getpid
This command will return the process id of the ctdb daemon.

disable
This command is used to administratively disable a node in the cluster. A disabled node will still
participate in the cluster and host clustered TDB records but its public ip address has been taken over
by a different node and it no longer hosts any services.

enable
Re-enable a node that has been administratively disabled.

stop
This command is used to administratively STOP a node in the cluster. A STOPPED node is connected to the
cluster but will not host any public ip addresses, nor does it participate in the VNNMAP. The difference
between a DISABLED node and a STOPPED node is that a STOPPED node does not host any parts of the database
which means that a recovery is required to stop/continue nodes.

continue
Re-start a node that has been administratively stopped.

addipIPADDR/maskIFACE
This command is used to add a new public ip to a node during runtime. It should be followed by a ctdbipreallocate. This allows public addresses to be added to a cluster without having to restart the ctdb
daemons.

Note that this only updates the runtime instance of ctdb. Any changes will be lost next time ctdb is
restarted and the public addresses file is re-read. If you want this change to be permanent you must also
update the public addresses file manually.

delipIPADDR
This command flags IPADDR for deletion from a node at runtime. It should be followed by a ctdbipreallocate. If IPADDR is currently hosted by the node it is being removed from, this ensures that the
IP will first be failed over to another node, if possible, and that it is then actually removed.

Note that this only updates the runtime instance of CTDB. Any changes will be lost next time CTDB is
restarted and the public addresses file is re-read. If you want this change to be permanent you must also
update the public addresses file manually.

moveipIPADDRPNN
This command can be used to manually fail a public ip address to a specific node.

In order to manually override the "automatic" distribution of public ip addresses that ctdb normally
provides, this command only works when you have changed the tunables for the daemon to:

IPAllocAlgorithm != 0

NoIPFailback = 1

shutdown
This command will shutdown a specific CTDB daemon.

setlmasterroleon|off
This command is used to enable/disable the LMASTER capability for a node at runtime. This capability
determines whether or not a node can be used as an LMASTER for records in the database. A node that does
not have the LMASTER capability will not show up in the vnnmap.

Nodes will by default have this capability, but it can be stripped off nodes by the setting in the
sysconfig file or by using this command.

Once this setting has been enabled/disabled, you need to perform a recovery for it to take effect.

Author

       This documentation was written by Ronnie Sahlberg, Amitay Isaacs, Martin Schwenke

Copyright

       Copyright © 2007 Andrew Tridgell, Ronnie Sahlberg

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation; either version 3 of the License, or
       (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
       License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, see
       http://www.gnu.org/licenses.

ctdb                                               06/19/2025                                            CTDB(1)

Debugging Commands

These commands are primarily used for CTDB development and testing and should not be used for normal
administration.

OPTIONS
--print-emptyrecords
This enables printing of empty records when dumping databases with the catdb, cattbd and dumpdbbackup
commands. Records with empty data segment are considered deleted by ctdb and cleaned by the vacuuming
mechanism, so this switch can come in handy for debugging the vacuuming behaviour.

--print-datasize
This lets database dumps (catdb, cattdb, dumpdbbackup) print the size of the record data instead of
dumping the data contents.

--print-lmaster
This lets catdb print the lmaster for each record.

--print-hash
This lets database dumps (catdb, cattdb, dumpdbbackup) print the hash for each record.

--print-recordflags
This lets catdb and dumpdbbackup print the record flags for each record. Note that cattdb always
prints the flags.

process-existsPID[SRVID]
This command checks if a specific process exists on the CTDB host. This is mainly used by Samba to check
if remote instances of samba are still running or not. When the optional SRVID argument is specified, the
command check if a specific process exists on the CTDB host and has registered for specified SRVID.

getdbstatusDB
This command displays more details about a database.

Example

# ctdb getdbstatus test.tdb.0
dbid: 0x122224da
name: test.tdb
path: /var/lib/ctdb/test.tdb.0
PERSISTENT: no
HEALTH: OK

# ctdb getdbstatus registry.tdb # with a corrupted TDB
dbid: 0xf2a58948
name: registry.tdb
path: /var/lib/ctdb/persistent/registry.tdb.0
PERSISTENT: yes
HEALTH: NO-HEALTHY-NODES - ERROR - Backup of corrupted TDB in '/var/lib/ctdb/persistent/registry.tdb.0.corrupted.20091208091949.0Z'

catdbDB
Print a dump of the clustered TDB database DB.

cattdbDB
Print a dump of the contents of the local TDB database DB.

dumpdbbackupFILE
Print a dump of the contents from database backup FILE, similar to catdb.

wipedbDB
Remove all contents of database DB.

recover
This command will trigger the recovery daemon to do a cluster recovery.

ipreallocate,sync
This command will force the leader to perform a full ip reallocation process and redistribute all ip
addresses. This is useful to "reset" the allocations back to its default state if they have been changed
using the "moveip" command. While a "recover" will also perform this reallocation, a recovery is much
more hevyweight since it will also rebuild all the databases.

attachDBNAME [persistent|replicated]
Create a new CTDB database called DBNAME and attach to it on all nodes.

detachDB-LIST
Detach specified non-persistent database(s) from the cluster. This command will disconnect specified
database(s) on all nodes in the cluster. This command should only be used when none of the specified
database(s) are in use.

All nodes should be active and tunable AllowClientDBAccess should be disabled on all nodes before
detaching databases.

dumpmemory
This is a debugging command. This command will make the ctdb daemon to write a fill memory allocation map
to standard output.

rddumpmemory
This is a debugging command. This command will dump the talloc memory allocation tree for the recovery
daemon to standard output.

banBANTIME
Administratively ban a node for BANTIME seconds. The node will be unbanned after BANTIME seconds have
elapsed.

A banned node does not participate in the cluster. It does not host any records for the clustered TDB and
does not host any public IP addresses.

Nodes are automatically banned if they misbehave. For example, a node may be banned if it causes too many
cluster recoveries.

To administratively exclude a node from a cluster use the stop command.

unban
This command is used to unban a node that has either been administratively banned using the ban command
or has been automatically banned.

Description

       ctdb is a utility to view and manage a CTDB cluster.

       The following terms are used when referring to nodes in a cluster:

       PNN
           Physical Node Number. The physical node number is an integer that describes the node in the cluster.
           The first node has physical node number 0. in a cluster.

       PNN-LIST
           This is either a single PNN, a comma-separate list of PNNs or "all".

       Commands that reference a database use the following terms:

       DB
           This is either a database name, such as locking.tdb or a database ID such as "0x42fe72c5".

       DB-LIST
           A space separated list of at least one DB.

Internal Commands

Internal commands are used by CTDB's scripts and are not required for managing a CTDB cluster. Their
parameters and behaviour are subject to change.

getticklesIPADDR
Show TCP connections that are registered with CTDB to be "tickled" if there is a failover.

gratarpIPADDRINTERFACE
Send out a gratuitous ARP for the specified interface through the specified interface. This command is
mainly used by the ctdb eventscripts.

pdeleteDBKEY
Delete KEY from DB.

pfetchDBKEY
Print the value associated with KEY in DB.

pstoreDBKEYFILE
Store KEY in DB with contents of FILE as the associated value.

ptransDB [FILE]
Read a list of key-value pairs, one per line from FILE, and store them in DB using a single transaction.
An empty value is equivalent to deleting the given key.

The key and value should be separated by spaces or tabs. Each key/value should be a printable string
enclosed in double-quotes.

runstate[setup|first_recovery|startup|running]
Print the runstate of the specified node. Runstates are used to serialise important state transitions in
CTDB, particularly during startup.

If one or more optional runstate arguments are specified then the node must be in one of these runstates
for the command to succeed.

Example

# ctdb runstate
RUNNING

setifacelinkIFACE up|down
Set the internal state of network interface IFACE. This is typically used in the 10.interface script in
the "monitor" event.

Example: ctdb setifacelink eth0 up

tickle
Read a list of TCP connections, one per line, from standard input and send a TCP tickle to the source
host for each connection. A connection is specified as:

SRC-IPADDR:SRC-PORTDST-IPADDR:DST-PORT

A single connection can be specified on the command-line rather than on standard input.

A TCP tickle is a TCP ACK packet with an invalid sequence and acknowledge number and will when received
by the source host result in it sending an immediate correct ACK back to the other end.

TCP tickles are useful to "tickle" clients after a IP failover has occurred since this will make the
client immediately recognize the TCP connection has been disrupted and that the client will need to
reestablish. This greatly speeds up the time it takes for a client to detect and reestablish after an IP
failover in the ctdb cluster.

version
Display the CTDB version.

Name

       ctdb - CTDB management utility

Options

       -n PNN
           The node specified by PNN should be queried for the requested information. Default is to query the
           daemon running on the local host.

       -Y
           Produce output in machine readable form for easier parsing by scripts. This uses a field delimiter of
           ':'. Not all commands support this option.

       -x SEPARATOR
           Use SEPARATOR to delimit fields in machine readable output. This implies -Y.

       -X
           Produce output in machine readable form for easier parsing by scripts. This uses a field delimiter of
           '|'. Not all commands support this option.

           This is equivalent to "-x|" and avoids some shell quoting issues.

       -t TIMEOUT
           Indicates that ctdb should wait up to TIMEOUT seconds for a response to most commands sent to the
           CTDB daemon. The default is 10 seconds.

       -T TIMELIMIT
           Indicates that TIMELIMIT is the maximum run time (in seconds) for the ctdb command. When TIMELIMIT is
           exceeded the ctdb command will terminate with an error. The default is 120 seconds.

       -? --help
           Print some help text to the screen.

       --usage
           Print usage information to the screen.

       -d --debug=DEBUGLEVEL
           Change the debug level for the command. Default is NOTICE.

Synopsis

ctdb [OPTION...] {COMMAND} [COMMAND-ARGS]

ctdb - CTDB management utility

Contents

Administrative Commands

Author

Copyright

Debugging Commands

Description

Internal Commands

Name

Options

See Also

Synopsis

See Also