Specifications

Chapter 6: Administering Virtual Clusters
72 Equalizer Installation and Administration Guide
• probe_port is used to select one port on the Equalizer to be used to for all content probes of
the system (such as ACV) as well as protocol-specific health checks. It works for both Layer
4 and Layer 7 clusters.
In previous implementations, probing was always done on the server port. However with a
port range (see Step 6 on page 68), it cannot be assumed that the first port in the range will
have a service running on it.
By default, the probe_port field is set to zero and the Equalizer uses the start_port (for L4)
or port (for L7) field value for the probe port. To change the default behavior, set probe_port
to a specific port number.
A probe_port value can be set on the servers in the cluster as well; see Step 7 on page 89
under “Adding a Server to a Cluster”.
(Note that the server agent port remains a separate port that is used only for server agent
communication; see Step 8 on page 69.)
• max_conn sets the maximum number of connections for all servers in the cluster. This value
can be overridden by the max_conn setting for an individual server. See “Setting Maximum
Connections per Server” on page 94.
• netmask is the netmask that applies to this cluster and is used to define an IP subnet that is
different than the IP subnet defined for the external interface. It is assumed that the customer
has the proper routing in place for clients to access multiple IP subnets defined on the
Equalizer.
• send buffer applies to L7 clusters and is the amount of memory in kilobytes reserved by each
L7 proxy process to store outgoing data before it is placed on the network interface.
• receive buffer applies to L7 clusters and is the amount of memory in kilobytes reserved by
each L7 proxy process to store data that has been received on an interface before it is
processed by an L7 proxy process.
• request max applies to L7 clusters and is the maximum number of kilobytes allotted for
HTTP request headers.
• response max applies to L7 clusters and is the maximum number of kilobytes allotted for
HTTP response headers.
• probe delay is the number of seconds between probes of the cluster’s servers. This applies to
both TCP probes and ACV probes (if enabled). Also see the global parameters
probe_interval, probe_timeout, probe_delay, and strikeout threshhold under “Modifying
System Parameters” on page 43.
• agent probe is an optional string that is sent to an agent when an agent probe occurs. See
Appendix A, ”Using Server Agents” for more information.
• connect timeout applies to L7 clusters and is the time in seconds that Equalizer waits for a
server to respond to a connection request.
• client timeout applies to L7 clusters and is the time in seconds that Equalizer waits before
closing an idle client connection. Valid values are between 1 and 150.
• server timeout app
lies to L7 clusters and is
the time in seconds that Equalizer waits before
closing an idle server connection.
• custom header applies to HTTPS clusters and allows you to specify a custom HTTP header
that Equalizer will insert into incoming requests; this header indicates to the servers in the