Using an asynchronous task | Creating UCS File

[Julio_Navarro]

Hi,

I am trying the following REST URL to create a task to generate a UCS File:

Method: Post
URI: mgmt/tm/task/sys/ucs/
Body: { "command": "save",    "name": "UCS01" }

So, I get back:

{
  "_taskId": 1563464422689504,
  "_taskState": "STARTED",
  "_taskTimeInStateMs": 0,
  "_taskResultLink": "https://localhost/mgmt/tm/task/sys/ucs/1563464422689504/result?ver=12.1.3.4",
  "selfLink": "https://localhost/mgmt/tm/task/sys/ucs/1563464422689504?ver=12.1.3.4"
}

Now, when I do check the status:

Method: Get
URI: /mgmt/tm/task/sys/ucs/1563464422689504

I gel back:

{
  "selfLink": "https://localhost/mgmt/tm/task/sys/ucs/1563464422689504?ver=12.1.3.4",
  "_taskId": 1563464422689504,
  "_taskState": "COMPLETED",
  "_taskTimeInStateMs": 5000,
  "_taskResultLink": "https://localhost/mgmt/tm/task/sys/ucs/1563464422689504/result?ver=12.1.3.4"
}

When I go to /var/local/ucs, I don't see the UCS created.

** Maybe I am missing something. Please advise **

----------- If I don't use the "task" option, then it will worked. But I would like to use the task option to take advantage of asynchronous tasks ----

Thank you

[cjunior]

Hi,

Tested on v15.0.0 looks OK for me.

What BIG-IP version are you trying to?

curl -k -u admin:admin  -X POST -H 'Content-Type: application/json'  -d '{ "command": "save", "name": "UCS01" }' https://localhost/mgmt/tm/task/sys/ucs
 
{
  "_taskId": 1563470408202544,
  "_taskState": "STARTED",
  "_taskTimeInStateMs": 0,
  "_taskResultLink": "https://localhost/mgmt/tm/task/sys/ucs/1563470408202544/result?ver=15.0.0",
  "selfLink": "https://localhost/mgmt/tm/task/sys/ucs/1563470408202544?ver=15.0.0"
}

curl -k -u admin:admin -H 'Content-Type: application/json' -X PUT -d '{"_taskState":"VALIDATING"}' https://localhost/mgmt/tm/task/sys/ucs/1563470408202544
 
{
  "code": 202,
  "message": "Task will execute asynchronously.",
  "errorStack": []
}

curl -k -u admin:admin  https://localhost/mgmt/tm/task/sys/ucs/1563470408202544
 
{
  "selfLink": "https://localhost/mgmt/tm/task/sys/ucs/1563470408202544?ver=15.0.0",
  "_taskId": 1563470408202544,
  "_taskState": "COMPLETED",
  "_taskTimeInStateMs": 13000,
  "_taskResultLink": "https://localhost/mgmt/tm/task/sys/ucs/1563470408202544/result?ver=15.0.0"
}

# ls -la /var/local/ucs
total 484520
drwxr-xr-x. 3 root root      4096 Jul 18 14:29 .
drwxr-xr-x. 9 root root      4096 Jun 28 12:23 ..
-rw-r--r--. 1 root root 195341011 Jun 28 12:23 config.ucs
-r--r--r--. 1 root root       114 May 10 05:57 cs_backup_rotate.conf
drwxr-xr-x. 2 root root      4096 Jun 28 12:43 tmp
-rw-r--r--. 1 root root 300789664 Jul 18 14:15 UCS01.ucs
 

[Julio_Navarro]

Hi, we are on version 12.1.3.4

[cjunior]

Buddy, It works for me on v12.1.3.4.

# curl -k -u admin:admin  -X POST -H 'Content-Type: application/json'  -d '{ "command": "save", "name": "UCS01" }' https://localhost/mgmt/tm/task/sys/ucs
{
    "_taskId":1563478591515657,
    "_taskState":"STARTED",
    "_taskTimeInStateMs":0,
    "_taskResultLink":"https://localhost/mgmt/tm/task/sys/ucs/1563478591515657/result?ver=12.1.3.4",
    "selfLink":"https://localhost/mgmt/tm/task/sys/ucs/1563478591515657?ver=12.1.3.4"
}
 
# curl -k -u admin:admin -H 'Content-Type: application/json' -X PUT -d '{"_taskState":"VALIDATING"}' https://localhost/mgmt/tm/task/sys/ucs/1563478591515657?ver=12.1.3.4
{
    "code":202,
    "message":"Task will execute asynchronously.",
    "errorStack":[]
}
 
# curl -k -u admin:admin  https://localhost/mgmt/tm/task/sys/ucs/1563478591515657?ver=12.1.3.4
{
    "selfLink":"https://localhost/mgmt/tm/task/sys/ucs/1563478591515657?ver=12.1.3.4",
    "_taskId":1563478591515657,
    "_taskState":"COMPLETED",
    "_taskTimeInStateMs":10000,
    "_taskResultLink":"https://localhost/mgmt/tm/task/sys/ucs/1563478591515657/result?ver=12.1.3.4"
}
 
 
# ls -la /var/local/ucs
total 3976
drwxr-xr-x. 3 root root    4096 2019-07-18 12:37 .
drwxr-xr-x. 9 root root    4096 2019-07-18 12:20 ..
-r--r--r--. 1 root root     114 2018-04-10 13:52 cs_backup_rotate.conf
drwxr-xr-x. 2 root root    4096 2019-07-18 12:22 tmp
-rw-r--r--. 1 root root 4049809 2019-07-18 12:37 UCS01.ucs

So, if you can save UCS from another way, we can't confirm issues during save the file.

It sounds strange to me 😞

[Jason_Adams · Accepted solution]

 ; to close the loop on this one, it appears that you the part that was missing in your request is the -X PUT request, to set the state to 'VALIDATING'

# curl -k -u admin:admin -H 'Content-Type: application/json' -X PUT -d '{"_taskState":"VALIDATING"}' https://localhost/mgmt/tm/task/sys/ucs/1563478591515657?ver=12.1.3.4
{
    "code":202,
    "message":"Task will execute asynchronously.",
    "errorStack":[]
}

That is the request which is necessary to cause any task to begin processing. Until then, the task is waiting for any number of additional tasks to be added together.

[Julio_Navarro]

And you are right! Thank you.

[Roman_Melekh]

Hello

It looks like I need somebody's help to determine what could be wrong with my script.

I am re-writing all the logic using PowerShell, but the idea is the same - to create a task, to start the task, to check if the task state is COMPLETED and then to download the result.

Here is what I am facing:

step1, to create a task:

_taskId            : 1684506387897122
_taskState         : STARTED
_taskTimeInStateMs : 0
_taskResultLink    : https://localhost/mgmt/tm/task/sys/ucs/1684506387897122/result?ver=16.1.3.4
selfLink           : https://localhost/mgmt/tm/task/sys/ucs/1684506387897122?ver=16.1.3.4

step2, to start the task

code       : 202
message    : Task will execute asynchronously.
errorStack : {}

step3, getting status (the request hags for ~30 seconds):

Invoke-RestMethod : {"code":400,"message":"remoteSender:10.0.3.138, method:GET ","referer":"10.0.3.138","restOperationId":15296221,"kind":":resterrorresponse"}

If I request status for the 2nd time, I can get (sometimes) task COMPLETED, or I can get a "Task not found" error. My question is why do sometimes tasks disappear?