Archive for the Category: Linux

Linux

When starting VirtualBox i got the error:
VirtualBox: supR3HardenedMainGetTrustedMain: dlopen(“/usr/lib/virtualbox/VirtualBox.so”,) failed: VBoxVMM.so: cannot open shared object file: No such file or directory

It took me some time to find a solution, it’s a dirty trick, but it actually works;

on 32 bit systems:
find /usr/lib/virtualbox/ -name \*.so -exec ln -s -t /lib '{}' ';'

on 64 bit systems:
find /usr/lib64/virtualbox/ -name \*.so -exec ln -s -t /lib64 '{}' ';'

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Linux

I don’t know why but suddenly the cursor keys don’t work anymore. The keypad moves my mouse pointer. I tried numlock ;)
The solution:
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Linux

Removing annoying ^M characters that show up in files after edited on a Windows box.

:%s/[ctrlkey+v and ctrl-key+M]//g

And in VI the command shows like:

:%s/^V^M//g

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Linux

Whenever a client connects to a server via network, a connection is established and opened on the system. On a busy high load server, the number of connections connected to the server can be run into large amount till hundreds if not thousands. Find out and get a list of connections on the server by each node, client or IP address is useful for system scaling planning, and in most cases, detect and determine whether a web server is under DoS or DDoS attack (Distributed Denial of Service), where an IP sends large amount of connections to the server. To check connection numbers on the server, administrators and webmasters can make use of netstat command.
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Linux

VIRT stands for the virtual size of a process, which is the sum of memory it is actually using, memory it has mapped into itself (for instance the video card’s RAM for the X server), files on disk that have been mapped into it (most notably shared libraries), and memory shared with other processes. VIRT represents how much memory the program is able to access at the present moment.
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