Ubuntu Manpage: ctdb - CTDB management utility

Provided by: ctdb_4.3.11+dfsg-0ubuntu0.16.04.34_amd64

NAME

       ctdb - CTDB management utility

SYNOPSIS


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

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.

OPTIONS

-n PNN-LIST
The nodes specified by PNN-LIST 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 useage information to the screen.

-d --debug=DEBUGLEVEL
Change the debug level for the command. Default is NOTICE (2).

--socket=FILENAME
Specify that FILENAME is the name of the Unix domain socket to use when connecting to the local CTDB
daemon. The default is /tmp/ctdb.socket.

ADMINISTRATIVE COMMANDS

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

pnn
This command displays the PNN of the current node.

xpnn
This command displays the PNN of the current node without contacting the CTDB daemon. It parses the nodes
file directly, so can produce unexpected output if the nodes file has been edited but has not been
reloaded.

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

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

Node status

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.

Virtual Node Number (VNN) map

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

Recovery mode

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 recovery master 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 recovery master 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.

Recovery master

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

Only one node at a time can be the designated recovery master. Which node is designated the recovery
master 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)
Recovery master: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 ctdb status exits with 0
if it was able to retrieve status for all nodes.

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

By default, ctdb nodestatus gathers status from the local node. However, if invoked with "-n all" (or
similar) then status is gathered from the given node(s). In particular ctdb nodestatus all and ctdb
nodestatus -n all will produce different output. It is possible to provide 2 different nodespecs
(with and without "-n") but the output is usually confusing!

A common invocation in scripts is ctdb nodestatus all 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

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

Note: If the 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

natgwlist
Show the current NAT gateway master and the status of all nodes in the current NAT gateway group. See the
NAT GATEWAY section in ctdb(7) for more details.

Example

# ctdb natgwlist
0 192.168.2.200
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

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

Example

# ctdb ping -n all
response from 0 time=0.000054 sec (3 clients)
response from 1 time=0.000144 sec (2 clients)
response from 2 time=0.000105 sec (2 clients)
response from 3 time=0.000114 sec (2 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 -n 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|

ipinfo IP
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)

scriptstatus
This command displays which scripts where run in the previous monitoring cycle and the result of each
script. If a script failed with an error, causing the node to become unhealthy, the output from that
script is also shown.

Example

# ctdb scriptstatus
7 scripts were executed last monitoring cycle
00.ctdb Status:OK Duration:0.056 Tue Mar 24 18:56:57 2009
10.interface Status:OK Duration:0.077 Tue Mar 24 18:56:57 2009
11.natgw Status:OK Duration:0.039 Tue Mar 24 18:56:57 2009
20.multipathd Status:OK Duration:0.038 Tue Mar 24 18:56:57 2009
31.clamd Status:DISABLED
40.vsftpd Status:OK Duration:0.045 Tue Mar 24 18:56:57 2009
41.httpd Status:OK Duration:0.039 Tue Mar 24 18:56:57 2009
50.samba Status:ERROR Duration:0.082 Tue Mar 24 18:56:57 2009
OUTPUT:ERROR: Samba tcp port 445 is not responding

disablescript SCRIPT
This command is used to disable an eventscript.

This will take effect the next time the eventscripts are being executed so it can take a short while
until this is reflected in 'scriptstatus'.

enablescript SCRIPT
This command is used to enable an eventscript.

This will take effect the next time the eventscripts are being executed so it can take a short while
until this is reflected in 'scriptstatus'.

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
MaxRedirectCount = 3
SeqnumInterval = 1000
ControlTimeout = 60
TraverseTimeout = 20
KeepaliveInterval = 5
KeepaliveLimit = 5
RecoverTimeout = 20
RecoverInterval = 1
ElectionTimeout = 3
TakeoverTimeout = 9
MonitorInterval = 15
TickleUpdateInterval = 20
EventScriptTimeout = 30
EventScriptTimeoutCount = 1
RecoveryGracePeriod = 120
RecoveryBanPeriod = 300
DatabaseHashSize = 100001
DatabaseMaxDead = 5
RerecoveryTimeout = 10
EnableBans = 1
DeterministicIPs = 0
LCP2PublicIPs = 1
ReclockPingPeriod = 60
NoIPFailback = 0
DisableIPFailover = 0
VerboseMemoryNames = 0
RecdPingTimeout = 60
RecdFailCount = 10
LogLatencyMs = 0
RecLockLatencyMs = 1000
RecoveryDropAllIPs = 120
VacuumInterval = 10
VacuumMaxRunTime = 30
RepackLimit = 10000
VacuumLimit = 5000
VacuumFastPathCount = 60
MaxQueueDropMsg = 1000000
UseStatusEvents = 0
AllowUnhealthyDBRead = 0
StatHistoryInterval = 1
DeferredAttachTO = 120
AllowClientDBAttach = 1
RecoverPDBBySeqNum = 0

getvar NAME
Get the runtime value of a tuneable variable.

Example

# ctdb getvar MaxRedirectCount
MaxRedirectCount = 3

setvar NAME VALUE
Set the runtime value of a tuneable variable.

Example: ctdb setvar MaxRedirectCount 5

lvsmaster
This command shows which node is currently the LVSMASTER. The LVSMASTER is the node in the cluster which
drives the LVS system and which receives all incoming traffic from clients.

LVS is the mode where the entire CTDB/Samba cluster uses a single ip address for the entire cluster. In
this mode all clients connect to one specific node which will then multiplex/loadbalance the clients
evenly onto the other nodes in the cluster. This is an alternative to using public ip addresses. See the
manpage for ctdbd for more information about LVS.

lvs
This command shows which nodes in the cluster are currently active in the LVS configuration. I.e. which
nodes we are currently loadbalancing the single ip address across.

LVS will by default only loadbalance across those nodes that are both LVS capable and also HEALTHY.
Except if all nodes are UNHEALTHY in which case LVS will loadbalance across all UNHEALTHY nodes as well.
LVS will never use nodes that are DISCONNECTED, STOPPED, BANNED or DISABLED.

Example output:

2:10.0.0.13
3:10.0.0.14

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

Example output:

RECMASTER: YES
LMASTER: YES
LVS: NO
NATGW: 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
num_clients 3
frozen 0
recovering 0
client_packets_sent 360489
client_packets_recv 360466
node_packets_sent 480931
node_packets_recv 240120
keepalive_packets_sent 4
keepalive_packets_recv 3
node
req_call 2
reply_call 2
req_dmaster 0
reply_dmaster 0
reply_error 0
req_message 42
req_control 120408
reply_control 360439
client
req_call 2
req_message 24
req_control 360440
timeouts
call 0
control 0
traverse 0
total_calls 2
pending_calls 0
lockwait_calls 0
pending_lockwait_calls 0
memory_used 5040
max_hop_count 0
max_call_latency 4.948321 sec
max_lockwait_latency 0.000000 sec

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

Example: ctdb statisticsreset

dbstatistics DB
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
Num Hot Keys: 1
Count:8 Key:ff5bd7cb3ee3822edc1f0000000000000000000000000000

getreclock
Show the name of the recovery lock file, if any.

Example output:

Reclock file:/clusterfs/.ctdb/recovery.lock

setreclock [FILE]
FILE specifies the name of the recovery lock file. If the recovery lock file is changed at run-time then
this will cause a recovery, which in turn causes the recovery lock to be retaken.

If no FILE is specified then a recovery lock file will no longer be used.

This command only affects the run-time setting of a single CTDB node. This setting must be changed on all
nodes simultaneously by specifying -n all (or similar). For information about configuring the recovery
lock file please see the CTDB_RECOVERY_LOCK entry in ctdbd.conf(5) and the --reclock entry in ctdbd(1).
For information about the recovery lock please see the RECOVERY LOCK section in ctdb(7).

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 :

ERR WARNING NOTICE INFO DEBUG

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

The debuglevel is one of ERR 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 addresse, 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.

addip IPADDR/mask IFACE
This command is used to add a new public ip to a node during runtime. 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.

delip IPADDR
This command is used to remove a public ip from a node during runtime. If this public ip is currently
hosted by the node it being removed from, the ip will first be failed over to another node, if possible,
before it is removed.

moveip IPADDR PNN
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:

DeterministicIPs = 0

NoIPFailback = 1

shutdown
This command will shutdown a specific CTDB daemon.

setlmasterrole on|off
This command is used ot 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.

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.

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

gratiousarp IPADDR INTERFACE
Send out a gratious ARP for the specified interface through the specified interface. This command is
mainly used by the ctdb eventscripts.

killtcp
Read a list of TCP connections, one per line, from standard input and terminate each connection. A
connection is specified as:

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

Each connection is terminated by issuing a TCP RST to the SRC-IPADDR:SRC-PORT endpoint.

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

pdelete DB KEY
Delete KEY from DB.

pfetch DB KEY
Print the value associated with KEY in DB.

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

ptrans DB [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

setifacelink IFACE 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

setnatgwstate on|off
Enable or disable the NAT gateway master capability on a node.

tickle SRC-IPADDR:SRC-PORT DST-IPADDR:DST-PORT
Send a TCP tickle to the source host for the specified TCP connection. 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 occured 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.

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-exists PID
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.

getdbstatus DB
This command displays more details about a database.

Example

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

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

catdb DB
Print a dump of the clustered TDB database DB.

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

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

wipedb DB
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 recovery master 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.

getmonmode
This command returns the monutoring mode of a node. The monitoring mode is either ACTIVE or DISABLED.
Normally a node will continuously monitor that all other nodes that are expected are in fact connected
and that they respond to commands.

ACTIVE - This is the normal mode. The node is actively monitoring all other nodes, both that the
transport is connected and also that the node responds to commands. If a node becomes unavailable, it
will be marked as DISCONNECTED and a recovery is initiated to restore the cluster.

DISABLED - This node is not monitoring that other nodes are available. In this mode a node failure will
not be detected and no recovery will be performed. This mode is useful when for debugging purposes one
wants to attach GDB to a ctdb process but wants to prevent the rest of the cluster from marking this node
as DISCONNECTED and do a recovery.

setmonmode 0|1
This command can be used to explicitly disable/enable monitoring mode on a node. The main purpose is if
one wants to attach GDB to a running ctdb daemon but wants to prevent the other nodes from marking it as
DISCONNECTED and issuing a recovery. To do this, set monitoring mode to 0 on all nodes before attaching
with GDB. Remember to set monitoring mode back to 1 afterwards.

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

detach DB-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.

thaw
Thaw a previously frozen node.

eventscript ARGUMENTS
This is a debugging command. This command can be used to manually invoke and run the eventscritps with
arbitrary arguments.

ban BANTIME
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.

rebalancenode [PNN-LIST]
This command marks the given nodes as rebalance targets in the LCP2 IP allocation algorithm. The
reloadips command will do this as necessary so this command should not be needed.

check_srvids SRVID ...
This command checks whether a set of srvid message ports are registered on the node or not. The command
takes a list of values to check.

Example

# ctdb check_srvids 1 2 3 14765
Server id 0:1 does not exist
Server id 0:2 does not exist
Server id 0:3 does not exist
Server id 0:14765 exists

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                                               04/14/2021                                            CTDB(1)

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

ADMINISTRATIVE COMMANDS

INTERNAL COMMANDS

DEBUGGING COMMANDS

SEE ALSO

AUTHOR

COPYRIGHT