Category Archives: Operating Systems

You have noticed such behaviour in the system logs (/var/log/messages)? kernel: httpd invoked oom-killer: gfp_mask=0x201d2, order=0, oomkilladj=0 kernel: Call Trace: kernel: [<ffffffff800cb67d>] out_of_memory+0x8e/0x2f3 kernel: [<ffffffff8002e493>] __wake_up+0x38/0x4f kernel: [<ffffffff8000a7ea>] get_page_from_freelist+0x2/0x442 kernel: [<ffffffff8000f6a2>] __alloc_pages+0x27f/0x308 kernel: [<ffffffff8001308d>] __do_page_cache_readahead+0x96/0x17b kernel: [<ffffffff800139d6>] filemap_nopage+0x14c/0x360 kernel: [<ffffffff80008972>] __handle_mm_fault+0x1fd/0x103b kernel: [<ffffffff8000c795>] _atomic_dec_and_lock+0x39/0x57 kernel: [<ffffffff800671ae>] do_page_fault+0x499/0x842 kernel: [<ffffffff8005ddf9>] error_exit+0x0/0x84 Additionally, the system was hanging/very… Read More »

It is fine to list users manually when you have a few, but can be just unthinkable when you have a thousand! Fortunately, PowerShell can make it easy for you. The following command will list all the users (even those who are disabled) with a lot of useful information. The command to use is :… Read More »

If you are working on Juniper ScreenOS on a daily basis on a few platform/OS and SSH clients, you probably noticed that in some circumstances that the backspace or delete key isn’t working (it just does nothing, you cannot delete anything of what you have typed if you did a mistake!)… and this can be… Read More »

I recently end up with the following error trying to build the R1Soft agent module using “r1soft-setup –get-module” command : Checking if module needs updated Checking for binary module Waiting                       / No binary module found Gathering kernel information Gathering kernel information complete. Creating kernel… Read More »