# Using an asynchronous task | Creating UCS File **URL:** \ **Category:** Technical Forums\ **Tags:** big-ip, super-netops, ltm\ **Created:** [July 18, 2019, 3:45pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322 "2019-07-18T15:45:38Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Julio\_Navarro](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@Julio\_Navarro](https://community.f5.com/u/Julio_Navarro)\ **Post date:** [July 18, 2019, 3:45pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/1 "2019-07-18T15:45:38Z")
Hi, I am trying the following REST URL to create a task to generate a UCS File: ```tcl Method: Post URI: mgmt/tm/task/sys/ucs/ Body: { "command": "save",    "name": "UCS01" } ``` So, I get back: ```tcl {   "_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: ```tcl Method: Get URI: /mgmt/tm/task/sys/ucs/1563464422689504 ``` I gel back: ```tcl {   "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 ---
**Author:** ![cjunior](https://avatars.discourse-cdn.com/v4/letter/c/779978/32.png) [@cjunior](https://community.f5.com/u/cjunior)\ **Post date:** [July 18, 2019, 5:32pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/2 "2019-07-18T17:32:58Z")
Hi, Tested on v15.0.0 looks OK for me. What BIG-IP version are you trying to? ```tcl 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" } ``` ```tcl 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": [] } ``` ```tcl 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" } ``` ```tcl # 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   ``` ---
**Author:** ![Julio\_Navarro](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@Julio\_Navarro](https://community.f5.com/u/Julio_Navarro)\ **Post date:** [July 18, 2019, 6:53pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/3 "2019-07-18T18:53:21Z")
Hi, we are on version 12.1.3.4 ---
**Author:** ![cjunior](https://avatars.discourse-cdn.com/v4/letter/c/779978/32.png) [@cjunior](https://community.f5.com/u/cjunior)\ **Post date:** [July 18, 2019, 8:23pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/4 "2019-07-18T20:23:02Z")
Buddy, It works for me on v12.1.3.4. ```tcl # 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 😞 ---
**Author:** ![Jason\_Adams](https://d1p9zq3aats0t8.cloudfront.net/user_avatar/community.f5.com/jason_adams/32/3658_2.png) [@Jason\_Adams](https://community.f5.com/u/Jason_Adams)\ **Post date:** [April 24, 2020, 3:38pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/5 "2020-04-24T15:38:22Z")
; 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’ ```tcl # 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. ---
**Author:** ![Julio\_Navarro](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@Julio\_Navarro](https://community.f5.com/u/Julio_Navarro)\ **Post date:** [April 24, 2020, 7:42pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/6 "2020-04-24T19:42:04Z")
And you are right! Thank you. ---
**Author:** ![Roman\_Melekh](https://avatars.discourse-cdn.com/v4/letter/r/8e8cbc/32.png) [@Roman\_Melekh](https://community.f5.com/u/Roman_Melekh)\ **Post date:** [May 19, 2023, 2:32pm UTC](https://community.f5.com/t/using-an-asynchronous-task-creating-ucs-file/62322/7 "2023-05-19T14:32:38Z")
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: ```json _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 ```json code : 202 message : Task will execute asynchronously. errorStack : {} ``` step3, getting status (the request hags for ~30 seconds): ```powershell 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?