Alteon Application Switch Operating System Application Guide
Health Checking
Document ID: RDWR-ALOS-V2900_AG1302
489
•
Minimum and maximum value—Specifies the minimum and/or maximum value that can be
received as response that is considered a success. This should be used when the OID value is of
numeric type (integer, counter, and so on)
•
Response String—Specifies a string expected in the SNMP response value that represents health
check success. This should be used when the OID value is of string type.
Note:
If no expected response is configured (minimal or maximal value, or string), the health
check just checks that an SNMP response is received.
•
Readjust Weight—Specifies whether the real server weights should be dynamically adjusted
based on SNMP health check response. If the parameter is enabled and the value in the
response packet is greater than 100, then 100 is used as the weight (relevant only for an integer
parameter).
If an OID and community string are assigned per IDS real server (
/cfg/slb/real/ids
), then they
override the health check configuration.
FTP Server Health Checks
The Internet File Transfer Protocol (FTP) provides facilities for transferring files to and from remote
computer systems. Usually the user transferring a file needs authority to log in and access files on
the remote system. This protocol is documented in RFC 1123.
The FTP health check monitors an FTP service by attempting to login to the server and retrieve the
specified file size.
The following FTP-specific arguments are available:
•
Username—Specifies the login user name to the FTP server (up to 32 characters). Default:
anonymous
•
Password—Specifies the login password for the configured username (up to 32 characters).
•
Path/Filename—Specifies the name of the file to be downloaded (up to 256 characters). An
Inherit value can be configured to allow path/filename definition using the group content
parameter. If no filename is specified, the FTP health check only checks successful login to the
FTP server.
A pre-defined ftp health check is available for simple FTP service monitoring. The health check has
the username set to Anonymous and the path/filename parameter set to Inherit, allowing definition
using the group content and the destination port set to standard FTP control port (21).
POP3 Server Health Checks
The Post Office Protocol—Version 3 (POP3) is intended to permit a workstation to dynamically
access a maildrop on a server host. The POP3 protocol is used to allow a workstation to retrieve mail
that the server is holding for it. This protocol is documented in RFC 1939.
The POP3 health check monitors service availability by attempting login to the POP3 server and
requires username and password configuration (mandatory parameters). An Inherit value can be
configured for the two parameters to allow the user name and password configuration using the
group content (content includes user:password).
Note:
If the username and password are set to Inherit but group content is empty, the health check
performed for that group is TCP.
A pre-defined pop3 health check is available for simple POP3 service monitoring. The health check
has the username and password parameters set to Inherit, allowing definition using the group
content and the destination port set to standard POP3 port (110).
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