Difference between "Health Monitors" and "service port"

Hi,

Default config for monitor for Alias Address and Alias Service Port is All Addresses/Ports. It means that monitor is using IP and Port configured for member to which it is assigned. So if you have http monitor assigned to memebr with 10.10.10.1:8080 monitor will use this socket for HTTP request used to monitor member state.

In case you would like to not use IP or port configured for member you can enter static values in the Alias Address and Alias Service Port for monitor. So you can put 10.10.10.12 and 80 in monitor configuration. When such monitor is assigned to any member it will not use IP or port set for pool member but the ones set in monitor config. So for any member monitor will always use 10.10.10.12:80 to send HTTP requests.

Hope it makes sense.

Piotr

So, if the application nodes listens on port 8080, I have to configure the health monitor to check tcp 8080 at the pool configuration and this will check also the node members at the same port. Correct?

can you provide me the command (tmsh) for this?

can you provide me the command (tmsh) for this?

e.g.

root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm monitor https https
ltm monitor https https {
    adaptive disabled
    cipherlist DEFAULT:+SHA:+3DES:+kEDH
    compatibility enabled
    destination *:*
    interval 5
    ip-dscp 0
    send "GET /\r\n"
    time-until-up 0
    timeout 16
}

root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm monitor https https_443
ltm monitor https https_443 {
    adaptive disabled
    cipherlist DEFAULT:+SHA:+3DES:+kEDH
    compatibility enabled
    defaults-from https
    destination *:443
    interval 5
    ip-dscp 0
    send "GET /\r\n"
    time-until-up 0
    timeout 16
}

I meant what is the tmsh for pool creation if I want to inherit address and port from pool member. The pool nodes listen on port 8080 and I want to create the pool by tmsh as initially asked. Below I have also created a monitor that checks port 8080 in case I need to apply it to the health monitor.

ltm monitor tcp app_monitor_8080 { adaptive disabled defaults-from tcp destination *:webcache interval 5 ip-dscp 0 time-until-up 0 timeout 16 }

I meant what is the tmsh for pool creation if I want to inherit address and port from pool member.

if you want to monitor pool member port, you do not need to specify port when creating health monitor. by default, health monitor inherits port from pool member.

root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) create ltm monitor tcp mytcp
root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm monitor tcp mytcp
ltm monitor tcp mytcp {
    adaptive disabled
    defaults-from tcp
    destination *:*
    interval 5
    ip-dscp 0
    time-until-up 0
    timeout 16
}
root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) create ltm pool foo members add { 200.200.200.101:8080 } monitor mytcp
root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:8080 {
            address 200.200.200.101
            session monitor-enabled
            state up
        }
    }
    monitor mytcp
}
root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) q
[root@ve11c:Active:In Sync] config 
[root@ve11c:Active:In Sync] config  tcpdump -nni 0.0 -s0 port 8080
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 65535 bytes
18:59:57.180432 IP 200.200.200.13.33873 > 200.200.200.101.8080: S 2810917797:2810917797(0) win 14600  out slot1/tmm1 lis=
18:59:57.181936 IP 200.200.200.101.8080 > 200.200.200.13.33873: S 1824924698:1824924698(0) ack 2810917798 win 5792  in slot1/tmm1 lis=
18:59:57.184047 IP 200.200.200.13.33873 > 200.200.200.101.8080: . ack 1 win 115  out slot1/tmm1 lis=
18:59:57.184057 IP 200.200.200.13.33873 > 200.200.200.101.8080: F 1:1(0) ack 1 win 115  out slot1/tmm1 lis=
18:59:57.187998 IP 200.200.200.101.8080 > 200.200.200.13.33873: F 1:1(0) ack 2 win 46  in slot1/tmm1 lis=
18:59:57.190237 IP 200.200.200.13.33873 > 200.200.200.101.8080: . ack 2 win 115  out slot1/tmm1 lis=