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Alexander Lukyanov
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ASM - C - C++ - perl. Unix forever.
ASM - C - C++ - perl. Unix forever.

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Nice sunset.
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I was given this book :)
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Hot plug/unplug SATA drives on Linux
From time to time I need these commands. Before hot-unplugging a disk drive sdX make sure that no file systems from the disk are mounted, no swap active, no LVM volumes active ( N - partition number, VG - volume group, LV - logical volume): lsblk /dev/sdX ...
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Hanoi tower algorithm to move from any to any state (1993) In the year 1993 I have developed an algorithm to solve a generalized Hanoi tower problem: move from any state to any state. The algorithm is very simple and uses a nice state representation: a tern...
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Recovering after loss of a physical volume with LVM2 on Linux
Recently I have lost a hard drive which contained a physical volume of LVM2. It contained an insignificant file system with scratch data and a part of a RAID1 logical volume. To recover, it was necessary to repair the RAID1 LV and remove other partial LV. I...
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A few glitches with Fedora 24 installations
I have noticed multiple times that when a process seems to hang, strace sometimes can kick it forward and cause it to proceed and either terminate as it should or fail with a signal. There was a strange hang within systemd (PID 1), it apparently created a f...
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I was given this book :-) I'm so glad.
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Graceful squid restart
Squid is a well-known open source http proxy server. Sometimes it is necessary to change its configuration, for example to update ACL lists. Fortunately it has the command " squid -k reconfigure ". Unfortunately, during reconfiguration squid refuses new con...
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Port scan reporting
Internet worms scan the internet infecting new hosts, creating botnets, abusing services. For a long time I have had implemented port scan detection and blocking script for our local users. The perl script analyzed netflow information and when a certain lev...
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Internet scanning activity
Recently I have analyzed scanning activity from the Internet on our ASBR routers. Here are the most popular TCP ports being scanned (>1% of all scan attempts): Port Service Percent Purpose 22 ssh 12.6877 Shell access 23 telnet 9.4989 Shell access 1433 SQL s...
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