If you are running mission critical VMs under VMware, that even doing a planned maintenance for reboot to increase disk space isn’t a proper justification to achieve this task, you have to find a way to to it on the fly! Fortunately, there is ways around to make it happen. 1. You will first do… Read More »
You may end up at some point where you need detailed statistics about time synchronization on your Linux machine. To achieve that, simply do the following : 1. Edit your NTP configuration file : /etc/ntpd.conf 2. Append the following parameters : statistics loopstats statsdir /var/log/ntpstats/ filegen peerstats file peers type day link enable filegen loopstats… Read More »
Having repeated NTFS warning entries in EventViewer as the one below? Log Name: System Source: Ntfs Event ID: 57 Task Category: (2) Level: Warning Description: The system failed to flush data to the transaction log. Corruption may occur. This indicate an issue with the filesystem recovery mechanism and the filesystem might not be fault tolerant… Read More »
As a long time OpenVPN user, the major annoyance I faced with this software is obviously the inflexible behaviour of the Windows client, which is just fine if you are running/connecting to a remote server. However, if you are actively managing thousand servers and networks, you may end up at some point having the need to… Read More »
Running Windows 7 and eager to upgrade to Windows 10 but you do not see the update proposal in Windows update? Here is the checklist to go through and make sure you have all the requirements in order to get the free upgrade : 1. You are running a genuine version of Windows 2. Make… Read More »
You probably had this output error while trying unmounting a drive/mount point on a Linux or Unix system : Device or resource busy Of course, you certainly need to make sure that no user or process are accessing this filesystem in any way. Even though you have taken every precaution, you still may have this… Read More »
If you had installed your RHEL/CentOS 5 system using LSILogic Parallel controller, you may have noticed the horrible I/O performance… You unfortunately cannot just change the controller type and expect your VM to boot. There is a few easy steps to ensure that the OS can boot with the new controller. FIRST thing FIRST :… Read More »
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 »
The following error may occur while reloading CSF (csf -r) : *WARNING* Binary location for [HOST] [/usr/bin/host] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable *WARNING* Missing or incorrect binary locations will break csf and lfd functionality In this particular case, CSF was installed on a CentOS 7 server and there… Read More »