"Core the device" - what actually happens
I have read comments that certain bad settings, or irules, can cause the device to "core".
Whilst I understand that this is a bad thing to be avoided at all costs what actually happens when the device cores?
And what would the recovery steps look like?
Hi Dick_Dastardly ,
Core files are created for multiple reasons and finding them in your Bigip indicate that something abnormal happened , for instance :
>> CPU may reach 100 % , so bigip will create core file contains the reasons that made CPU to reach 100 %.
>> Restarting Bigip services such as ( pccd , mcpd , or bd crashing ..... ) , bigip will create core dump for this.
>> Something caused your bigip to reboot , after opening you will find core dump file.
>> and other abnormal behaviors can make bigip ip to core.
So in my opinion , if you troubleshoot during a critical issue related to bigip, you should check first if there are core dump files were created or not.
>> if you find core file , you must raise a case with F5 support immediately , as Support team is the only direction to help you in reading core files and extract the Root cause for your issue , they equiped sufficiently to support in this matter.
>> if you didn't find any core files created , you should proceed in your troubleshooting and see other possibilities that may casued this issue.
Core files are located in this direction , you can navigate it using CLI " Command line interface " :
ls -latr /var/core/
Also Take a quick look on this article to know how to manage core files :
I hope my comment helps you 🙂