Syntax error when appending to a datagroup with tmsh

Hello Ron,

As you are trying to modify an "external" data group you are getting this error because LTM is in a Read Only mode on the external data-groups.

You can see that by yourself when going to "Local Traffic ›› iRules : Data Group List ›› your_external_dg " you will discover that it is only pointing or referencing to an external file that you have uploaded from here

"System ›› File Management : Data Group File List" and clicking on "import"

So rather than trying to update a line in you data-group you will need to :

• copy the content (using ssh "cp" for example) of you data-group
• then importing it to override the existing one using the following command

tmsh create /sys file data-group string_name_value_external_v2_dg_file separator ":=" source-path file:/var/tmp/string_name_value_external_v2_dg.txt type string

You can check this following link if you need more details

https://devcentral.f5.com/articles/v11-irules-data-group-updates

Hope it helps

Regards