Monitors are used to poll and monitor services on the Netscaler to ensure that they are in service when required by clients.
Configuration
To create a new monitor
add lb monitor <monitor name> tcp <options>
So to create a new monitor to monitor TCP port 8012 named "alfa_8012"
add lb monitor alfa_8012 tcp -destport 8012
Default options include polling interval, timeouts, retries, etc as per the example below - these can all be adjusted accordingly.
> show monitor alfa_8012 1) Name.......: alfa_8012 Type......: TCP State....: ENABLED Standard parameters: Interval.........: 5 sec Retries...........: 3 Response timeout.: 2 sec Down time.........: 30 sec Reverse..........: NO Transparent.......: NO Secure...........: NO LRTM..............: DISABLED Action...........: Not applicable Deviation.........: 0 sec Destination IP...: Bound service Destination port.: 8012 Iptunnel.........: NO TOS..............: NO TOS ID............: 0 SNMP Alert Retries: 0 Success Retries..: 1 Failure Retries..: 0 Done
After creating a new monitor, you must bind it to an existing service.
bind lb monitor alfa_8012 pdc2axa002_8012
To see current state of bound services to a monitor
> show lb monbindings alfa_8012
alfa_8012 Type : TCP State : ENABLED
1) pdc1axa001_8012 (10.80.16.76:8012) Type : TCP Service state : UP Monitor state : ENABLED
2) pdc2axa002_8012 (10.160.16.32:8012) Type : TCP Service state : UP Monitor state : ENABLED
Done
>
Finally, you can see which monitor is bound to a given service
> show service pdc1axa001_8012
pdc1axa001_8012 (10.80.16.76:8012) - TCP
State: UP
Last state change was at Mon Jun 27 09:46:39 2016
Time since last state change: 7 days, 01:07:14.390
Server Name: pdc1axa001
Server ID : None Monitor Threshold : 0
Max Conn: 0 Max Req: 0 Max Bandwidth: 0 kbits
Use Source IP: NO
Client Keepalive(CKA): NO
Access Down Service: NO
TCP Buffering(TCPB): NO
HTTP Compression(CMP): NO
Idle timeout: Client: 9000 sec Server: 9000 sec
Client IP: DISABLED
Cacheable: NO
SC: OFF
SP: ON
Down state flush: ENABLED
Appflow logging: ENABLED
TD: 0
1) Monitor Name: alfa_8012
State: UP Weight: 1 Passive: 0
Probes: 95 Failed [Total: 0 Current: 0]
Last response: Success - TCP syn+ack received.
Response Time: 0.0 millisec
Done
