[SCM] CTDB repository - branch master updated - ctdb-1.13-50-g5cdeb0d
Ronnie Sahlberg
sahlberg at samba.org
Thu Mar 22 21:38:50 MDT 2012
The branch, master has been updated
via 5cdeb0dd8827b13b06265c75dfac359bcd6ad10c (commit)
from 7293762046e25a9c96e6417e34e18c214ebc6e55 (commit)
http://gitweb.samba.org/?p=ctdb.git;a=shortlog;h=master
- Log -----------------------------------------------------------------
commit 5cdeb0dd8827b13b06265c75dfac359bcd6ad10c
Author: Martin Schwenke <martin at meltin.net>
Date: Fri Mar 23 14:31:31 2012 +1100
Add policy routing documentation to ctdbd(1).
Signed-off-by: Martin Schwenke <martin at meltin.net>
-----------------------------------------------------------------------
Summary of changes:
doc/ctdbd.1 | 205 ++++++++++++++++++++++++++++++++++++++++-
doc/ctdbd.1.html | 274 ++++++++++++++++++++++++++++++++++++++++--------------
doc/ctdbd.1.xml | 230 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 635 insertions(+), 74 deletions(-)
Changeset truncated at 500 lines:
diff --git a/doc/ctdbd.1 b/doc/ctdbd.1
index 7e5443e..be527aa 100644
--- a/doc/ctdbd.1
+++ b/doc/ctdbd.1
@@ -1,13 +1,13 @@
'\" t
.\" Title: ctdbd
.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
-.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
-.\" Date: 03/22/2012
+.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
+.\" Date: 03/23/2012
.\" Manual: CTDB - clustered TDB database
.\" Source: ctdb
.\" Language: English
.\"
-.TH "CTDBD" "1" "03/22/2012" "ctdb" "CTDB \- clustered TDB database"
+.TH "CTDBD" "1" "03/23/2012" "ctdb" "CTDB \- clustered TDB database"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
@@ -785,6 +785,205 @@ If you want to change the NATGW configuration on a node :
.if n \{\
.RE
.\}
+.SH "POLICY ROUTING"
+.PP
+A node running CTDB may be a component of a complex network topology\&. In particular, public addresses may be spread across several different networks (or VLANs) and it may not be possible to route packets from these public addresses via the system\*(Aqs default route\&. Therefore, CTDB has support for policy routing via the 13\&.per_ip_routing eventscript\&. This allows routing to be specified for packets sourced from each public address\&. The routes are added and removed as CTDB moves public addresses between nodes\&.
+.SS "Configuration variables"
+.PP
+There are 4 configuration variables related to policy routing:
+.PP
+\fICTDB_PER_IP_ROUTING_CONF\fR
+.RS 4
+The name of a configuration file that specifies the desired routes for each source address\&. The configuration file format is discussed below\&. A recommended value is
+/etc/ctdb/policy_routing\&.
+.sp
+The special value
+\fB__auto_link_local__\fR
+indicates that no configuration file is provided and that CTDB should generate reasonable link\-local routes for each public address\&.
+.RE
+.PP
+\fICTDB_PER_IP_ROUTING_RULE_PREF\fR
+.RS 4
+This sets the priority (or preference) for the routing rules that are added by CTDB\&.
+.sp
+This should be (strictly) greater than 0 and (strictly) less than 32766\&. A priority of 100 is recommended, unless this conflicts with a priority already in use on the system\&. See ip(8) for more details\&.
+.RE
+.PP
+\fICTDB_PER_IP_ROUTING_TABLE_ID_LOW\fR, \fICTDB_PER_IP_ROUTING_TABLE_ID_HIGH\fR
+.RS 4
+CTDB determines a unique routing table number to use for the routing related to each public address\&. These variables indicate the minimum and maximum routing table numbers that are used\&.
+.sp
+The ip command uses some reserved routing table numbers below 255\&. Therefore, CTDB_PER_IP_ROUTING_TABLE_ID_LOW should be (strictly) greater than 255\&. 1000 and 9000 are recommended values, unless this range conflicts with routing tables numbers already in use on the system\&.
+.sp
+CTDB uses the standard file
+/etc/iproute2/rt_tables
+to maintain a mapping between the routing table numbers and labels\&. The label for a public address <addr;gt; will look like ctdb\&.<addr>\&. This means that the associated rules and routes are easy to read (and manipulate)\&.
+.RE
+.SS "Configuration file"
+.PP
+The format of each line is:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ <public_address> <network> [ <gateway> ]
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+Leading whitespace is ignored and arbitrary whitespace may be used as a separator\&. Lines that have a "public address" item that doesn\*(Aqt match an actual public address are ignored\&. This means that comment lines can be added using a leading character such as \*(Aq#\*(Aq, since this will never match an IP address\&.
+.PP
+A line without a gateway indicates a link local route\&.
+.PP
+For example, consider the configuration line:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ 192\&.168\&.1\&.99 192\&.168\&.1\&.1/24
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+If the corresponding public_addresses line is:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ 192\&.168\&.1\&.99/24 eth2,eth3
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+
+\fICTDB_PER_IP_ROUTING_RULE_PREF\fR
+is 100, and CTDB adds the address to eth2 then the following routing information is added:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ ip rule add from 192\&.168\&.1\&.99 pref 100 table ctdb\&.192\&.168\&.1\&.99
+ ip route add 192\&.168\&.1\&.0/24 dev eth2 table ctdb\&.192\&.168\&.1\&.99
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+This causes traffic from 192\&.168\&.1\&.1 to 192\&.168\&.1\&.0/24 go via eth2\&.
+.PP
+The
+\fBip rule\fR
+command will show (something like \- depending on other public addresses and other routes on the system):
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ 0: from all lookup local
+ 100: from 192\&.168\&.1\&.99 lookup ctdb\&.192\&.168\&.1\&.99
+ 32766: from all lookup main
+ 32767: from all lookup default
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+
+\fBip route show table ctdb\&.192\&.168\&.1\&.99\fR
+will show:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ 192\&.168\&.1\&.0/24 dev eth2 scope link
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+The usual use for a line containing a gateway is to add a default route corresponding to a particular source address\&. Consider this line of configuration:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ 192\&.168\&.1\&.99 0\&.0\&.0\&.0/0 192\&.168\&.1\&.1
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+In the situation described above this will cause an extra routing command to be executed:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ ip route add 0\&.0\&.0\&.0/0 via 192\&.168\&.1\&.1 dev eth2 table ctdb\&.192\&.168\&.1\&.99
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+With both configuration lines,
+\fBip route show table ctdb\&.192\&.168\&.1\&.99\fR
+will show:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ 192\&.168\&.1\&.0/24 dev eth2 scope link
+ default via 192\&.168\&.1\&.1 dev eth2
+
+.fi
+.if n \{\
+.RE
+.\}
+.SS "Example configuration"
+.PP
+Here is a more complete example configuration\&.
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+/etc/ctdb/public_addresses:
+
+ 192\&.168\&.1\&.98 eth2,eth3
+ 192\&.168\&.1\&.99 eth2,eth3
+
+/etc/ctdb/policy_routing:
+
+ 192\&.168\&.1\&.98 192\&.168\&.1\&.0/24
+ 192\&.168\&.1\&.98 192\&.168\&.200\&.0/24 192\&.168\&.1\&.254
+ 192\&.168\&.1\&.98 0\&.0\&.0\&.0/0 192\&.168\&.1\&.1
+ 192\&.168\&.1\&.99 192\&.168\&.1\&.0/24
+ 192\&.168\&.1\&.99 192\&.168\&.200\&.0/24 192\&.168\&.1\&.254
+ 192\&.168\&.1\&.99 0\&.0\&.0\&.0/0 192\&.168\&.1\&.1
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+The routes local packets as expected, the default route is as previously discussed, but packets to 192\&.168\&.200\&.0/24 are routed via the alternate gateway 192\&.168\&.1\&.254\&.
.SH "NOTIFICATION SCRIPT"
.PP
Notification scripts are used with ctdb to have a call\-out from ctdb to a user\-specified script when certain state changes occur in ctdb\&. This is commonly to set up either sending SNMP traps or emails when a node becomes unhealthy and similar\&.
diff --git a/doc/ctdbd.1.html b/doc/ctdbd.1.html
index add708b..95f1e75 100644
--- a/doc/ctdbd.1.html
+++ b/doc/ctdbd.1.html
@@ -1,4 +1,4 @@
-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>ctdbd</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="ctdbd"><a name="ctdbd.1"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ctdbd — The CTDB cluster daemon</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">ctdbd</code> </p></div><div class="cmdsynopsis"><p><code class="command">ctdbd</code> [-? --help] [-d --debug=<INTEGER>] {--dbdir=<directory>} {--dbdir-persistent=<directory>} [--event-script-dir=<directory>] [-i --interactive] [--listen=<address>] [--logfile=<filename>] [--lvs] {--nlist=<filename>} [--no-lmaster] [--no-recmaster] [--nosetsched] {--notification-script=<filename>} [--public-add
resses=<filename>] [--public-interface=<interface>] {--reclock=<filename>} [--single-public-ip=<address>] [--socket=<filename>] [--start-as-disabled] [--start-as-stopped] [--syslog] [--log-ringbuf-size=<num-entries>] [--torture] [--transport=<STRING>] [--usage]</p></div></div><div class="refsect1" title="DESCRIPTION"><a name="id557016"></a><h2>DESCRIPTION</h2><p>
+<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>ctdbd</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="ctdbd"><a name="ctdbd.1"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ctdbd — The CTDB cluster daemon</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">ctdbd</code> </p></div><div class="cmdsynopsis"><p><code class="command">ctdbd</code> [-? --help] [-d --debug=<INTEGER>] {--dbdir=<directory>} {--dbdir-persistent=<directory>} [--event-script-dir=<directory>] [-i --interactive] [--listen=<address>] [--logfile=<filename>] [--lvs] {--nlist=<filename>} [--no-lmaster] [--no-recmaster] [--nosetsched] {--notification-script=<filename>} [--public-add
resses=<filename>] [--public-interface=<interface>] {--reclock=<filename>} [--single-public-ip=<address>] [--socket=<filename>] [--start-as-disabled] [--start-as-stopped] [--syslog] [--log-ringbuf-size=<num-entries>] [--torture] [--transport=<STRING>] [--usage]</p></div></div><div class="refsect1" title="DESCRIPTION"><a name="idp187688"></a><h2>DESCRIPTION</h2><p>
ctdbd is the main ctdb daemon.
</p><p>
ctdbd provides a clustered version of the TDB database with automatic rebuild/recovery of the databases upon nodefailures.
@@ -8,7 +8,7 @@
ctdbd provides monitoring of all nodes in the cluster and automatically reconfigures the cluster and recovers upon node failures.
</p><p>
ctdbd is the main component in clustered Samba that provides a high-availability load-sharing CIFS server cluster.
- </p></div><div class="refsect1" title="OPTIONS"><a name="id557044"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">-? --help</span></dt><dd><p>
+ </p></div><div class="refsect1" title="OPTIONS"><a name="idp189672"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">-? --help</span></dt><dd><p>
Print some help text to the screen.
</p></dd><dt><span class="term">-d --debug=<DEBUGLEVEL></span></dt><dd><p>
This option sets the debuglevel on the ctdbd daemon which controls what will be written to the logfile. The default is 0 which will only log important events and errors. A larger number will provide additional logging.
@@ -154,10 +154,10 @@
implemented in the future.
</p></dd><dt><span class="term">--usage</span></dt><dd><p>
Print useage information to the screen.
- </p></dd></dl></div></div><div class="refsect1" title="Private vs Public addresses"><a name="id514151"></a><h2>Private vs Public addresses</h2><p>
+ </p></dd></dl></div></div><div class="refsect1" title="Private vs Public addresses"><a name="idp3305728"></a><h2>Private vs Public addresses</h2><p>
When used for ip takeover in a HA environment, each node in a ctdb
cluster has multiple ip addresses assigned to it. One private and one or more public.
- </p><div class="refsect2" title="Private address"><a name="id514160"></a><h3>Private address</h3><p>
+ </p><div class="refsect2" title="Private address"><a name="idp3306352"></a><h3>Private address</h3><p>
This is the physical ip address of the node which is configured in
linux and attached to a physical interface. This address uniquely
identifies a physical node in the cluster and is the ip addresses
@@ -187,7 +187,7 @@
10.1.1.2
10.1.1.3
10.1.1.4
- </pre></div><div class="refsect2" title="Public address"><a name="id514195"></a><h3>Public address</h3><p>
+ </pre></div><div class="refsect2" title="Public address"><a name="idp3309256"></a><h3>Public address</h3><p>
A public address on the other hand is not attached to an interface.
This address is managed by ctdbd itself and is attached/detached to
a physical node at runtime.
@@ -248,7 +248,7 @@
unavailable. 10.1.1.1 can not be failed over to node 2 or node 3 since
these nodes do not have this ip address listed in their public
addresses file.
- </p></div></div><div class="refsect1" title="Node status"><a name="id514257"></a><h2>Node status</h2><p>
+ </p></div></div><div class="refsect1" title="Node status"><a name="idp3314176"></a><h2>Node status</h2><p>
The current status of each node in the cluster can be viewed by the
'ctdb status' command.
</p><p>
@@ -285,9 +285,9 @@
RECMASTER or NATGW.
This node does not perticipate in the CTDB cluster but can still be
communicated with. I.e. ctdb commands can be sent to it.
- </p></div><div class="refsect1" title="PUBLIC TUNABLES"><a name="id514306"></a><h2>PUBLIC TUNABLES</h2><p>
+ </p></div><div class="refsect1" title="PUBLIC TUNABLES"><a name="idp3318200"></a><h2>PUBLIC TUNABLES</h2><p>
These are the public tuneables that can be used to control how ctdb behaves.
- </p><div class="refsect2" title="MaxRedirectCount"><a name="id514314"></a><h3>MaxRedirectCount</h3><p>Default: 3</p><p>
+ </p><div class="refsect2" title="MaxRedirectCount"><a name="idp3318832"></a><h3>MaxRedirectCount</h3><p>Default: 3</p><p>
If we are not the DMASTER and need to fetch a record across the network
we first send the request to the LMASTER after which the record
is passed onto the current DMASTER. If the DMASTER changes before
@@ -301,7 +301,7 @@
</p><p>
When chasing a record, this is how many hops we will chase the record
for before going back to the LMASTER to ask for new guidance.
- </p></div><div class="refsect2" title="SeqnumInterval"><a name="id514337"></a><h3>SeqnumInterval</h3><p>Default: 1000</p><p>
+ </p></div><div class="refsect2" title="SeqnumInterval"><a name="idp3320552"></a><h3>SeqnumInterval</h3><p>Default: 1000</p><p>
Some databases have seqnum tracking enabled, so that samba will be able
to detect asynchronously when there has been updates to the database.
Everytime a database is updated its sequence number is increased.
@@ -309,17 +309,17 @@
This tunable is used to specify in 'ms' how frequently ctdb will
send out updates to remote nodes to inform them that the sequence
number is increased.
- </p></div><div class="refsect2" title="ControlTimeout"><a name="id514356"></a><h3>ControlTimeout</h3><p>Default: 60</p><p>
+ </p></div><div class="refsect2" title="ControlTimeout"><a name="idp3321904"></a><h3>ControlTimeout</h3><p>Default: 60</p><p>
This is the default
setting for timeout for when sending a control message to either the
local or a remote ctdb daemon.
- </p></div><div class="refsect2" title="TraverseTimeout"><a name="id514369"></a><h3>TraverseTimeout</h3><p>Default: 20</p><p>
+ </p></div><div class="refsect2" title="TraverseTimeout"><a name="idp3322792"></a><h3>TraverseTimeout</h3><p>Default: 20</p><p>
This setting controls how long we allow a traverse process to run.
After this timeout triggers, the main ctdb daemon will abort the
traverse if it has not yet finished.
- </p></div><div class="refsect2" title="KeepaliveInterval"><a name="id514383"></a><h3>KeepaliveInterval</h3><p>Default: 5</p><p>
+ </p></div><div class="refsect2" title="KeepaliveInterval"><a name="idp3323728"></a><h3>KeepaliveInterval</h3><p>Default: 5</p><p>
How often in seconds should the nodes send keepalives to eachother.
- </p></div><div class="refsect2" title="KeepaliveLimit"><a name="id514396"></a><h3>KeepaliveLimit</h3><p>Default: 5</p><p>
+ </p></div><div class="refsect2" title="KeepaliveLimit"><a name="idp3324560"></a><h3>KeepaliveLimit</h3><p>Default: 5</p><p>
After how many keepalive intervals without any traffic should a node
wait until marking the peer as DISCONNECTED.
</p><p>
@@ -328,60 +328,60 @@
require a recovery. This limitshould not be set too high since we want
a hung node to be detectec, and expunged from the cluster well before
common CIFS timeouts (45-90 seconds) kick in.
- </p></div><div class="refsect2" title="RecoverTimeout"><a name="id514415"></a><h3>RecoverTimeout</h3><p>Default: 20</p><p>
+ </p></div><div class="refsect2" title="RecoverTimeout"><a name="idp3326000"></a><h3>RecoverTimeout</h3><p>Default: 20</p><p>
This is the default setting for timeouts for controls when sent from the
recovery daemon. We allow longer control timeouts from the recovery daemon
than from normal use since the recovery dameon often use controls that
can take a lot longer than normal controls.
- </p></div><div class="refsect2" title="RecoverInterval"><a name="id514430"></a><h3>RecoverInterval</h3><p>Default: 1</p><p>
+ </p></div><div class="refsect2" title="RecoverInterval"><a name="idp3327040"></a><h3>RecoverInterval</h3><p>Default: 1</p><p>
How frequently in seconds should the recovery daemon perform the
consistency checks that determine if we need to perform a recovery or not.
- </p></div><div class="refsect2" title="ElectionTimeout"><a name="id514444"></a><h3>ElectionTimeout</h3><p>Default: 3</p><p>
+ </p></div><div class="refsect2" title="ElectionTimeout"><a name="idp3327944"></a><h3>ElectionTimeout</h3><p>Default: 3</p><p>
When electing a new recovery master, this is how many seconds we allow
the election to take before we either deem the election finished
or we fail the election and start a new one.
- </p></div><div class="refsect2" title="TakeoverTimeout"><a name="id514458"></a><h3>TakeoverTimeout</h3><p>Default: 9</p><p>
+ </p></div><div class="refsect2" title="TakeoverTimeout"><a name="idp3328896"></a><h3>TakeoverTimeout</h3><p>Default: 9</p><p>
This is how many seconds we allow controls to take for IP failover events.
- </p></div><div class="refsect2" title="MonitorInterval"><a name="id514470"></a><h3>MonitorInterval</h3><p>Default: 15</p><p>
+ </p></div><div class="refsect2" title="MonitorInterval"><a name="idp3329736"></a><h3>MonitorInterval</h3><p>Default: 15</p><p>
How often should ctdb run the event scripts to check for a nodes health.
- </p></div><div class="refsect2" title="TickleUpdateInterval"><a name="id514482"></a><h3>TickleUpdateInterval</h3><p>Default: 20</p><p>
+ </p></div><div class="refsect2" title="TickleUpdateInterval"><a name="idp3330568"></a><h3>TickleUpdateInterval</h3><p>Default: 20</p><p>
How often will ctdb record and store the "tickle" information used to
kickstart stalled tcp connections after a recovery.
- </p></div><div class="refsect2" title="EventScriptTimeout"><a name="id514496"></a><h3>EventScriptTimeout</h3><p>Default: 20</p><p>
+ </p></div><div class="refsect2" title="EventScriptTimeout"><a name="idp3331432"></a><h3>EventScriptTimeout</h3><p>Default: 20</p><p>
How long should ctdb let an event script run before aborting it and
marking the node unhealthy.
- </p></div><div class="refsect2" title="EventScriptTimeoutCount"><a name="id514509"></a><h3>EventScriptTimeoutCount</h3><p>Default: 1</p><p>
+ </p></div><div class="refsect2" title="EventScriptTimeoutCount"><a name="idp3332296"></a><h3>EventScriptTimeoutCount</h3><p>Default: 1</p><p>
How many events in a row needs to timeout before we flag the node UNHEALTHY.
This setting is useful if your scripts can not be written so that they
do not hang for benign reasons.
- </p></div><div class="refsect2" title="EventScriptUnhealthyOnTimeout"><a name="id514523"></a><h3>EventScriptUnhealthyOnTimeout</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="EventScriptUnhealthyOnTimeout"><a name="idp3333224"></a><h3>EventScriptUnhealthyOnTimeout</h3><p>Default: 0</p><p>
This setting can be be used to make ctdb never become UNHEALTHY if your
eventscripts keep hanging/timing out.
- </p></div><div class="refsect2" title="RecoveryGracePeriod"><a name="id514537"></a><h3>RecoveryGracePeriod</h3><p>Default: 120</p><p>
+ </p></div><div class="refsect2" title="RecoveryGracePeriod"><a name="idp3334072"></a><h3>RecoveryGracePeriod</h3><p>Default: 120</p><p>
During recoveries, if a node has not caused recovery failures during the
last grace period, any records of transgressions that the node has caused
recovery failures will be forgiven. This resets the ban-counter back to
zero for that node.
- </p></div><div class="refsect2" title="RecoveryBanPeriod"><a name="id514551"></a><h3>RecoveryBanPeriod</h3><p>Default: 300</p><p>
+ </p></div><div class="refsect2" title="RecoveryBanPeriod"><a name="idp3335096"></a><h3>RecoveryBanPeriod</h3><p>Default: 300</p><p>
If a node becomes banned causing repetitive recovery failures. The node will
eventually become banned from the cluster.
This controls how long the culprit node will be banned from the cluster
before it is allowed to try to join the cluster again.
Don't set to small. A node gets banned for a reason and it is usually due
to real problems with the node.
- </p></div><div class="refsect2" title="DatabaseHashSize"><a name="id514570"></a><h3>DatabaseHashSize</h3><p>Default: 100001</p><p>
+ </p></div><div class="refsect2" title="DatabaseHashSize"><a name="idp3336624"></a><h3>DatabaseHashSize</h3><p>Default: 100001</p><p>
Size of the hash chains for the local store of the tdbs that ctdb manages.
- </p></div><div class="refsect2" title="DatabaseMaxDead"><a name="id514582"></a><h3>DatabaseMaxDead</h3><p>Default: 5</p><p>
+ </p></div><div class="refsect2" title="DatabaseMaxDead"><a name="idp3337472"></a><h3>DatabaseMaxDead</h3><p>Default: 5</p><p>
How many dead records per hashchain in the TDB database do we allow before
the freelist needs to be processed.
- </p></div><div class="refsect2" title="RerecoveryTimeout"><a name="id558165"></a><h3>RerecoveryTimeout</h3><p>Default: 10</p><p>
+ </p></div><div class="refsect2" title="RerecoveryTimeout"><a name="idp3338352"></a><h3>RerecoveryTimeout</h3><p>Default: 10</p><p>
Once a recovery has completed, no additional recoveries are permitted
until this timeout has expired.
- </p></div><div class="refsect2" title="EnableBans"><a name="id558178"></a><h3>EnableBans</h3><p>Default: 1</p><p>
+ </p></div><div class="refsect2" title="EnableBans"><a name="idp3339216"></a><h3>EnableBans</h3><p>Default: 1</p><p>
When set to 0, this disables BANNING completely in the cluster and thus
nodes can not get banned, even it they break. Don't set to 0 unless you
know what you are doing.
- </p></div><div class="refsect2" title="DeterministicIPs"><a name="id558191"></a><h3>DeterministicIPs</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="DeterministicIPs"><a name="idp3340144"></a><h3>DeterministicIPs</h3><p>Default: 0</p><p>
When enabled, this tunable makes ctdb try to keep public IP addresses
locked to specific nodes as far as possible. This makes it easier for
debugging since you can know that as long as all nodes are healthy
@@ -392,12 +392,12 @@
public IP assignment changes in the cluster. This tunable may increase
the number of IP failover/failbacks that are performed on the cluster
by a small margin.
- </p></div><div class="refsect2" title="LCP2PublicIPs"><a name="id558211"></a><h3>LCP2PublicIPs</h3><p>Default: 1</p><p>
+ </p></div><div class="refsect2" title="LCP2PublicIPs"><a name="idp3341688"></a><h3>LCP2PublicIPs</h3><p>Default: 1</p><p>
When enabled this switches ctdb to use the LCP2 ip allocation
algorithm.
- </p></div><div class="refsect2" title="ReclockPingPeriod"><a name="id558223"></a><h3>ReclockPingPeriod</h3><p>Default: x</p><p>
+ </p></div><div class="refsect2" title="ReclockPingPeriod"><a name="idp3342528"></a><h3>ReclockPingPeriod</h3><p>Default: x</p><p>
Obsolete
- </p></div><div class="refsect2" title="NoIPFailback"><a name="id558235"></a><h3>NoIPFailback</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="NoIPFailback"><a name="idp3343296"></a><h3>NoIPFailback</h3><p>Default: 0</p><p>
When set to 1, ctdb will not perform failback of IP addresses when a node
becomes healthy. Ctdb WILL perform failover of public IP addresses when a
node becomes UNHEALTHY, but when the node becomes HEALTHY again, ctdb
@@ -415,7 +415,7 @@
intervention from the administrator. When this parameter is set, you can
manually fail public IP addresses over to the new node(s) using the
'ctdb moveip' command.
- </p></div><div class="refsect2" title="DisableIPFailover"><a name="id558262"></a><h3>DisableIPFailover</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="DisableIPFailover"><a name="idp3345464"></a><h3>DisableIPFailover</h3><p>Default: 0</p><p>
When enabled, ctdb will not perform failover or failback. Even if a
node fails while holding public IPs, ctdb will not recover the IPs or
assign them to another node.
@@ -424,39 +424,39 @@
the cluster by failing IP addresses over to other nodes. This leads to
a service outage until the administrator has manually performed failover
to replacement nodes using the 'ctdb moveip' command.
- </p></div><div class="refsect2" title="NoIPTakeover"><a name="id558281"></a><h3>NoIPTakeover</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="NoIPTakeover"><a name="idp3346888"></a><h3>NoIPTakeover</h3><p>Default: 0</p><p>
When set to 1, ctdb will allow ip addresses to be failed over onto this
node. Any ip addresses that the node currently hosts will remain on the
node but no new ip addresses can be failed over onto the node.
- </p></div><div class="refsect2" title="VerboseMemoryNames"><a name="id558295"></a><h3>VerboseMemoryNames</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="VerboseMemoryNames"><a name="idp3347864"></a><h3>VerboseMemoryNames</h3><p>Default: 0</p><p>
This feature consumes additional memory. when used the talloc library
will create more verbose names for all talloc allocated objects.
- </p></div><div class="refsect2" title="RecdPingTimeout"><a name="id558308"></a><h3>RecdPingTimeout</h3><p>Default: 60</p><p>
+ </p></div><div class="refsect2" title="RecdPingTimeout"><a name="idp3348768"></a><h3>RecdPingTimeout</h3><p>Default: 60</p><p>
If the main dameon has not heard a "ping" from the recovery dameon for
this many seconds, the main dameon will log a message that the recovery
daemon is potentially hung.
- </p></div><div class="refsect2" title="RecdFailCount"><a name="id558321"></a><h3>RecdFailCount</h3><p>Default: 10</p><p>
+ </p></div><div class="refsect2" title="RecdFailCount"><a name="idp3349712"></a><h3>RecdFailCount</h3><p>Default: 10</p><p>
If the recovery daemon has failed to ping the main dameon for this many
consecutive intervals, the main daemon will consider the recovery daemon
as hung and will try to restart it to recover.
- </p></div><div class="refsect2" title="LogLatencyMs"><a name="id558335"></a><h3>LogLatencyMs</h3><p>Default: 0</p><p>
+ </p></div><div class="refsect2" title="LogLatencyMs"><a name="idp3350672"></a><h3>LogLatencyMs</h3><p>Default: 0</p><p>
When set to non-zero, this will make the main daemon log any operation that
took longer than this value, in 'ms', to complete.
These include "how long time a lockwait child process needed",
"how long time to write to a persistent database" but also
"how long did it take to get a response to a CALL from a remote node".
- </p></div><div class="refsect2" title="RecLockLatencyMs"><a name="id558350"></a><h3>RecLockLatencyMs</h3><p>Default: 1000</p><p>
+ </p></div><div class="refsect2" title="RecLockLatencyMs"><a name="idp3351768"></a><h3>RecLockLatencyMs</h3><p>Default: 1000</p><p>
When using a reclock file for split brain prevention, if set to non-zero
this tunable will make the recovery dameon log a message if the fcntl()
call to lock/testlock the recovery file takes longer than this number of
ms.
- </p></div><div class="refsect2" title="RecoveryDropAllIPs"><a name="id558364"></a><h3>RecoveryDropAllIPs</h3><p>Default: 120</p><p>
+ </p></div><div class="refsect2" title="RecoveryDropAllIPs"><a name="idp3352776"></a><h3>RecoveryDropAllIPs</h3><p>Default: 120</p><p>
If we have been stuck in recovery, or stopped, or banned, mode for
this many seconds we will force drop all held public addresses.
- </p></div><div class="refsect2" title="verifyRecoveryLock"><a name="id558377"></a><h3>verifyRecoveryLock</h3><p>Default: 1</p><p>
+ </p></div><div class="refsect2" title="verifyRecoveryLock"><a name="idp3353680"></a><h3>verifyRecoveryLock</h3><p>Default: 1</p><p>
Should we take a fcntl() lock on the reclock file to verify that we are the
sole recovery master node on the cluster or not.
- </p></div><div class="refsect2" title="DeferredAttachTO"><a name="id558390"></a><h3>DeferredAttachTO</h3><p>Default: 120</p><p>
+ </p></div><div class="refsect2" title="DeferredAttachTO"><a name="idp3354568"></a><h3>DeferredAttachTO</h3><p>Default: 120</p><p>
When databases are frozen we do not allow clients to attach to the
databases. Instead of returning an error immediately to the application
the attach request from the client is deferred until the database
@@ -464,7 +464,7 @@
</p><p>
This timeout controls how long we will defer the request from the client
before timing it out and returning an error to the client.
- </p></div><div class="refsect2" title="HopcountMakeSticky"><a name="id558408"></a><h3>HopcountMakeSticky</h3><p>Default: 50</p><p>
+ </p></div><div class="refsect2" title="HopcountMakeSticky"><a name="idp70848"></a><h3>HopcountMakeSticky</h3><p>Default: 50</p><p>
If the database is set to 'STICKY' mode, using the 'ctdb setdbsticky'
command, any record that is seen as very hot and migrating so fast that
hopcount surpasses 50 is set to become a STICKY record for StickyDuration
@@ -475,15 +475,15 @@
migrating across the cluster so fast. This will improve performance for
certain workloads, such as locking.tdb if many clients are opening/closing
the same file concurrently.
- </p></div><div class="refsect2" title="StickyDuration"><a name="id558429"></a><h3>StickyDuration</h3><p>Default: 600</p><p>
+ </p></div><div class="refsect2" title="StickyDuration"><a name="idp72448"></a><h3>StickyDuration</h3><p>Default: 600</p><p>
Once a record has been found to be fetch-lock hot and has been flagged to
become STICKY, this is for how long, in seconds, the record will be
flagged as a STICKY record.
- </p></div><div class="refsect2" title="StickyPindown"><a name="id558442"></a><h3>StickyPindown</h3><p>Default: 200</p><p>
+ </p></div><div class="refsect2" title="StickyPindown"><a name="idp73400"></a><h3>StickyPindown</h3><p>Default: 200</p><p>
Once a STICKY record has been migrated onto a node, it will be pinned down
on that node for this number of ms. Any request from other nodes to migrate
the record off the node will be deferred until the pindown timer expires.
- </p></div><div class="refsect2" title="MaxLACount"><a name="id558456"></a><h3>MaxLACount</h3><p>Default: 20</p><p>
+ </p></div><div class="refsect2" title="MaxLACount"><a name="idp74400"></a><h3>MaxLACount</h3><p>Default: 20</p><p>
When record content is fetched from a remote node, if it is only for
reading the record, pass back the content of the record but do not yet
migrate the record. Once MaxLACount identical requests from the
@@ -491,13 +491,13 @@
--
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