Configuring Load Balancing

For information about load balancing, see Load Balancing in Oracle Directory Server Enterprise Edition Reference. This section explains how to configure load balancing and provides sample configurations.

To Select a Load Balancing Algorithm

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Obtain the current load balancing algorithm by viewing the properties of the LDAP data source pool.

$ dpconf get-ldap-data-source-pool-prop -h host -p port pool-name

The default properties of an LDAP data source pool are as follows:

client-affinity-bind-dn-filters         : any
client-affinity-criteria                : connection
client-affinity-ip-address-filters      : any
client-affinity-policy                  : write-affinity-after-write
client-affinity-timeout                 : 20s
description                             : Example data source pool
enable-client-affinity                  : false
load-balancing-algorithm                : proportional
minimum-total-weight                    : 100
proportion                              : 100
sample-size                             : 100

By default, the load balancing algorithm is proportional.

Configure the LDAP data source pool to use an algorithm.
```
$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
  load-balancing-algorithm:selected-algorithm
```
where selected-algorithm is one of the following:
- failover
- operational-affinity
- proportional
- saturation
- adaptive failover
- fastest server
For more information about the algorithms, see Introduction to Load Balancing in Oracle Directory Server Enterprise Edition Reference.
Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure Weights for Load Balancing

For the failover, operational-affinity, proportional, saturation, and adaptive failover algorithms, configure the weights of an attached data source in relation to the weights of any other attached data sources in the data source pool. Consider the weights of all of your attached data sources. If a data source has a weight of disabled for a type of operation, requests of that type are never sent to that data source. If a data source has a weight of 0 (zero), no requests are distributed to that data source.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

View the list of data sources that are attached to the data source pool.
```
$ dpconf list-attached-ldap-data-sources -h host -p port pool-name
```

View the properties of one of the attached data sources.

$ dpconf get-attached-ldap-data-source-prop pool-name \
 attached-data-source-name

The properties of an attached data source define the weight for each type of operation. The default weights of an attached data source are as follows:

add-weight        :  disabled  
bind-weight       :  disabled  
compare-weight    :  disabled  
delete-weight     :  disabled  
modify-dn-weight  :  disabled  
modify-weight     :  disabled  
search-weight     :  disabled

Configure the weights of one of the attached data sources.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name \
 attached-data-source-name add-weight:value \
 bind-weight:value compare-weight:value delete-weight:value \
 modify-dn-weight:value modify-weight:value search-weight:value

Repeat Step 2 and Step 3 for the other attached data sources.

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name

For example, a data source pool can contain data sources with the following weights:

$ dpconf list-attached-ldap-data-sources -h host1 -p 1389 -v myPool
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
DS-1     disabled   3               disabled       disabled      
DS-2     2          2           2              2             
DS-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
disabled         disabled      disabled
2                2             2
1                1             1

Example Configurations for Load Balancing

This section contains sample procedures for configuring each of the load balancing algorithms.

To Configure the Proportional Algorithm for Load Balancing

For a description of the proportional algorithm, see Proportional Algorithm for Load Balancing in Oracle Directory Server Enterprise Edition Reference.

In this example, the data source ds–1 is configured with twice the weight of the other two data sources.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views.

Configure the data source pool to use the proportional algorithm for load balancing.

$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
  load-balancing-algorithm:proportional

Configure the properties of the first data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-1 \
 add-weight:2 bind-weight:2 compare-weight:2 delete-weight:2 modify-dn-weight:2 \
 modify-weight:2 search-weight:2

Configure the properties of the second data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-2 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Configure the properties of the third data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-3 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
ds-1     2          2           2              2             
ds-2     1          1           1              1             
ds-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
2                2             2
1                1             1
1                1             1

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure the Saturation Algorithm for Load Balancing

For a description of the saturation algorithm, see Saturation Algorithm for Load Balancing in Oracle Directory Server Enterprise Edition Reference.

In this example, the data source ds-1 performs the majority of bind operations but does not perform any other types of operations. The three data sources are configured with the following weights :

ds-1 is configured with weight 3 for bind operations and is disabled for all other types of operations.
ds-2 is configured with weight 2 for all operations.
ds-3 is configured with weight 1 for all operations.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views.

Configure the data source pool to use the saturation algorithm for load balancing.

$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
 load-balancing-algorithm:saturation

Configure the properties of the first data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-1 \
 add-weight:disabled bind-weight:3 compare-weight:disabled delete-weight:disabled \
 modify-dn-weight:disabled modify-weight:disabled search-weight:disabled

Configure the properties of the second data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-2 \
 add-weight:2 bind-weight:2 compare-weight:2 delete-weight:2 modify-dn-weight:2 \
 modify-weight:2 search-weight:2

Configure the properties of the third data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-3 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
ds-1     disabled   3               disabled       disabled      
ds-2     2          2           2              2             
ds-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
disabled         disabled      disabled
2                2             2
1                1             1

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure the Operational Affinity Algorithm for Global Account Lockout

For a description of this algorithm, Operational Affinity Algorithm for Global Account Lockout in Oracle Directory Server Enterprise Edition Reference.

This example has three data sources. The data source ds-1 is configured to receive all bind requests.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views.

Configure the data source pool to use the operational affinity algorithm.

$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
 load-balancing-algorithm:operational-affinity

Configure the properties of the first data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-1 \
 add-weight:1 bind-weight:100 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Configure the properties of the second data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-2 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Configure the properties of the third data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-3 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
ds-1     1          100         1              1             
ds-2     1          1           1              1             
ds-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
1                1             1
1                1             1
1                1             1

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure Operational Affinity Algorithm for Cache Optimization

For a description of this algorithm, see Operational Affinity Algorithm for Cache Optimization in Oracle Directory Server Enterprise Edition Reference.

This example has three data sources. All search and compare operations are treated by the data source ds-1. When ds-1 responds to a request, the targeted entry is stored in the cache. If ds-1 responds repeatedly to the same request, the data source can use cached data.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views.

Configure the data source pool to use the operational affinity algorithm.

$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
 load-balancing-algorithm:operational-affinity

Configure the properties of the first data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-1 \
 add-weight:1 bind-weight:1 compare-weight:100 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:100

Configure the properties of the second data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-2 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Configure the properties of the third data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-3 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
ds-1     1          1           100            1             
ds-2     1          1           1              1             
ds-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
1                1             100
1                1             1
1                1             1

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure the Failover Algorithm for Load Balancing

For a description of the failover algorithm, see Failover Algorithm for Load Balancing in Oracle Directory Server Enterprise Edition Reference.

This example has three data sources. The data source ds-1 receives all requests. If ds-1 fails, ds-2 receives all requests until ds-1 recovers. If ds-2 fails before ds-1 recovers, ds-3 receives all requests.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views.

Configure the data source pool to use the failover algorithm for load balancing.

$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
 load-balancing-algorithm:failover

Configure the properties of the first data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-1 \
 add-weight:3 bind-weight:3 compare-weight:3 delete-weight:3 modify-dn-weight:3 \
 modify-weight:3 search-weight:3

Configure the properties of the second data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-2 \
 add-weight:2 bind-weight:2 compare-weight:2 delete-weight:2 modify-dn-weight:2 \
 modify-weight:2 search-weight:2

Configure the properties of the third data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-3 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
ds-1     3          3           3              3             
ds-2     2          2           2              2             
ds-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
3                3             3
2                2             2
1                1             1

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure the Adaptive Failover Algorithm for Load Balancing

For a description of the adaptive failover algorithm, see Adaptive Failover Algorithm for Load Balancing in Oracle Directory Server Enterprise Edition Reference.

This example has three data sources. The data source ds-1 receives all requests. If ds-1 fails, requests are distributed between ds-2 and ds-3 until ds-1 recovers. If ds-2 or ds-3 fails before ds-1 recovers, the other one receives all the requests.

You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views.

Configure the data source pool to use the adaptive failover algorithm for load balancing.

$ dpconf set-ldap-data-source-pool-prop -h host -p port pool-name \
load-balancing-algorithm:adaptive-failover minimum-total-weight:3

Configure the properties of the first data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-1 \
 add-weight:3 bind-weight:3 compare-weight:3 delete-weight:3 modify-dn-weight:3 \
 modify-weight:3 search-weight:3

Configure the properties of the second data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-2 \
 add-weight:2 bind-weight:2 compare-weight:2 delete-weight:2 modify-dn-weight:2 \
 modify-weight:2 search-weight:2

Configure the properties of the third data source.

$ dpconf set-attached-ldap-data-source-prop -h host -p port pool-name ds-3 \
 add-weight:1 bind-weight:1 compare-weight:1 delete-weight:1 modify-dn-weight:1 \
 modify-weight:1 search-weight:1

Compare the key parameters of the attached data sources.

$ dpconf list-attached-ldap-data-sources -h host -p port -v pool-name
SRC_NAME add-weight bind-weight compare-weight delete-weight 
-------- ---------- ----------- -------------- ------------- 
ds-1     3          3           3              3             
ds-2     2          2           2              2             
ds-3     1          1           1              1             

modify-dn-weight modify-weight search-weight
---------------- ------------- -------------
3                3             3
2                2             2
1                1             1

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

To Configure the Fastest Server Algorithm for Load Balancing

For a description of the fastest server algorithm, see Fastest Server Algorithm for Load Balancing in Oracle Directory Server Enterprise Edition Reference.

This algorithm doesn't use the data source weights the user configured. The data source weights are computed dynamically as a function of their response time.

You can use DSCC to perform this task. For information, see Fastest Server Algorithm for Load Balancing in Oracle Directory Server Enterprise Edition 11g Release 1 (11.1.1) Reference and the DSCC online help.

Before You Begin

Ensure that you have a data source pool with at least three attached data sources. For information about how to create data sources and data source pools, see Creating LDAP Data Views Creating LDAP Data Views.

Configure the data source pool to use the fastest server algorithm for load balancing.

$ dpconf set-ldap-data-source-pool-prop -host host  -p port  pool-name \

load-balancing-algorithm:fastest-server proportion:100 sample-size:300

Verify that the values are correctly set.

$ dpconf get-ldap-data-source-pool-prop -host host  -p port  pool-name  \
load-balancing-algorithm proportion sample-size
load-balancing-algorithm : fastest-server
proportion : 100
sample-size : 300

Restart the instance of Directory Proxy Server.
```
$ dpadm restart instance-path
```

Configuring Directory Proxy Server To Perform Load Balancing

A simple case of load balancing consists of sending search and compare operations to one set of directories, and sending other operations to another set. Directory Proxy Server receives all client operations. The server must determine which set gets the reads, and which set gets the other operations.

The key stages in configuring Directory Proxy Server to handle this load balancing scenario are as follows.

Add directories as data sources for Directory Proxy Server.
Add the data sources to a data source pool.
Configure some of the data sources to accept search and compare, other data sources to accept add, bind, delete, modify, and modify DN operations.
Add the data source pool to a data view.

The following example involves Directory Proxy Server, listening on port 9389. The proxy is configured here to balance the load as described across one Directory Server instance, ds1:1389, handling search and compare operations, and another Directory Server instance, ds2:2389, handling other operations.

The first step creates the data sources, and enables the data sources. This step requires a proxy server restart.

$ dpconf create-ldap-data-source -p 9389 ds1 localhost:1389
$ dpconf create-ldap-data-source -p 9389 ds2 localhost:2389
$ dpconf set-ldap-data-source-prop -p 9389 ds1 is-enabled:true
$ dpconf set-ldap-data-source-prop -p 9389 ds2 is-enabled:true
$ dpadm restart /local/dps

The second step adds the data sources to a data source pool.

$ dpconf create-ldap-data-source-pool -p 9389 "Directory Pool"
$ dpconf attach-ldap-data-source -p 9389 "Directory Pool" ds1 ds2

The third step configures ds1 to accept search and compare operations, ds2 to accept other operations.

$ dpconf set-attached-ldap-data-source-prop -p 9389 "Directory Pool" ds1 \
add-weight:disabled bind-weight:disabled compare-weight:1 delete-weight:disabled \
modify-dn-weight:disabled modify-weight:disabled search-weight:1
$ dpconf set-attached-ldap-data-source-prop -p 9389 "Directory Pool" ds2 \
add-weight:1 bind-weight:1 compare-weight:disabled delete-weight:1 \
modify-dn-weight:1 modify-weight:1 search-weight:disabled

The fourth step adds the data source pool to a data view, so that client application requests are routed to the pool.

$ dpconf create-ldap-data-view -p 9389 "Balanced View" "Directory Pool" \
dc=example,dc=com

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