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