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kartal's avatar
kartal
Icon for Altostratus rankAltostratus
Mar 29, 2021

How to use rest api to get the "Availability" attribute value of virtual server member without knowing its pool name

Hello,

How can I reach pool member availability property by using rest API calling with member IP?

I discover that if I call with pool name I can reach member availability but I want to access this value without using pool name since in the query phase I will not have pool name.

 

In current situation : I tried /mgmt/tm/ltm/node/~PROD~(member_ip) but this gives me pool availability

 

 

Desired : /mgmt/tm/ltm/pool/~PROD~(pool_name)/members/~PROD~(member_ip) gives me member availability property in session key, but I need pool_name.

 

 

 

Thanks.

  • Hello Kartal.

    To get the state of one member only using their IP, you need to use 'jq'.

    # curl -sku admin https://localhost/mgmt/tm/ltm/pool?expandSubcollections=true  | jq '.items[] | select(.membersReference.items[].address == "10.100.40.112") | .membersReference.items[].state'
    "down"

    In my case, I have one pool called P-WEB112_80 which has one member node with IP 10.100.40.112.

    # tmsh list ltm pool P-WEB112_80
    ltm pool P-WEB112_80 {
        members {
            N-WEB112:http {
                address 10.100.40.112
                session monitor-enabled
                state down
            }
        }
        monitor gateway_icmp
    }

    This solves what you are requesting, but take into account that if this member is applied to more than one pool, you will see in the output "up" "up" or "down" "down" without any information about the pool, so in this case, you could use something like this.

    # curl -sku admin https://localhost/mgmt/tm/ltm/pool?expandSubcollections=true  | jq '.items[] | select(.membersReference.items[].address == "10.100.40.111") | .name, .membersReference.items[].state'
    "P-REPO_8080"
    "up"
    "P-WEB111_80"
    "up"

    If you need to collect any other field (like 'session'), you can extend the previous expression accordingly.

    Regards,

    Dario.

8 Replies

  • Hi there

    You believe you have to fetch all pools including subCollections and filter the result

    Example:

    curl -sku admin:admin https://bigip-01.domain.com/mgmt/tm/ltm/pool?expandSubcollections=true

    Worth noting:

    • There are guides on filtering using $select but I've yet to encounter one that filters subcollections. You can have a look at this article or check out the documentation for OData which F5 used for this API implementation (both linked inline in this sentence). I am not sure if they have full support for OData though so keep that in mind.
    • The call to the REST API above is very heavy so if you might want to avoid it if doing it often or to a device with many pools without using some kind of caching proxy.

    Kind regards,

    Patrik

  • Hello Kartal.

    To get the state of one member only using their IP, you need to use 'jq'.

    # curl -sku admin https://localhost/mgmt/tm/ltm/pool?expandSubcollections=true  | jq '.items[] | select(.membersReference.items[].address == "10.100.40.112") | .membersReference.items[].state'
    "down"

    In my case, I have one pool called P-WEB112_80 which has one member node with IP 10.100.40.112.

    # tmsh list ltm pool P-WEB112_80
    ltm pool P-WEB112_80 {
        members {
            N-WEB112:http {
                address 10.100.40.112
                session monitor-enabled
                state down
            }
        }
        monitor gateway_icmp
    }

    This solves what you are requesting, but take into account that if this member is applied to more than one pool, you will see in the output "up" "up" or "down" "down" without any information about the pool, so in this case, you could use something like this.

    # curl -sku admin https://localhost/mgmt/tm/ltm/pool?expandSubcollections=true  | jq '.items[] | select(.membersReference.items[].address == "10.100.40.111") | .name, .membersReference.items[].state'
    "P-REPO_8080"
    "up"
    "P-WEB111_80"
    "up"

    If you need to collect any other field (like 'session'), you can extend the previous expression accordingly.

    Regards,

    Dario.

    • kartal's avatar
      kartal
      Icon for Altostratus rankAltostratus

      Dear Dario, thank you for your detailed answer. I have one more small question: I am trying to reach F5 IP from outside and in the curl command I am taking curl: (35) schannel: SNI or certificate check failed: SEC_E_WRONG_PRINCIPAL (0x80090322) error. I also tried with -s but that time nothing returned. Can you give me an idea about it?