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-Miscellanous Notes
-==================
-    
-A collection of short notes on things I wish to remember. Many topics are heavily outdated.
-
-Backing up and Restoring Docker Volumes
----------------------------------------
-
-    July 3, 2017
-
-One of my first questions, when starting my docker experience was 
-how to backup and restore docker volumes.
-
-### On the source host
-
-First of all identify your volumes:
-
-    $ docker ps
-    $ docker inspect my_container_name | grep -C 1 -i Source
-
-Now you can backup the directory to a tar on your host machine:
-
-    $ docker run –rm –volumes-from my_container_name -v $(pwd):/backup ubuntu tar cvf /backup/backup_db.tar /var/lib/mysql
-
-### On the target host
-
-In order to securely copy and restore the volume on the target host one can run:
-
-    $ scp source_host:~/backup_db.tar .
-    $ docker run –rm –volumes-frommy_container_name -v $(pwd):/backup ubuntu bash -c “cd /var/lib/mysql && tar xvf /backup/backup_db.tar –strip 1″
-
-A Growing Collection of Linux Command Line One-Liners
-------------------------------------------------------
-
-Please believe me... this collection was really supposed to grow over time...
-
-inside a direcotry show disk usage of all hidden files and directories and sort by size:
-
-    $ du $(ls .* -d | tail -n +3) -hs |sort -h
-
-inside a direcotry show disk usage of all files and directories (also hidden) and sort by size.
-Exclude ./DATA file.
-
-    $ du . -a -d 1 -h –exclude=’./DATA’ | sort -h
-
-Tar all files in current directory, excluding ./DATA and ./.cache
-
-    $ tar –exclude=’./.cache’ –exclude=’./DATA’ -cvf home_miguel_20180216.tar .
-
-Find files in ./ARCHIVE NOT belonging to a specific user: miguel
-
-    $ find ARCHIVE/ \! -user miguel
-
-set folder/ permissions to Read/Browse only for owner recursively
-
-    $ sudo chmod -R u=r,g=,o= folder/
-    $ chmod -R u=rX,g=,o= folder/
-
-find all mails from Boban when in the maildir full of mailboxes and print only short headers without bodies:
-
-    $ grepmail -H -B -Y ‘(^TO:|^From:)’ Boban *
-
-not really a one-lier but will print 256 colors in a bash:
-
-    for i in {0..255} ; do
-        printf "\x1b[48;5;%sm%3d\e[0m " "$i" "$i"
-        if (( i == 15 )) || (( i > 15 )) && (( (i-15) % 6 == 0 )); then
-            printf "\n";
-        fi
-    done
-
-Some Tools of Choice
---------------------
-
-### Systems
-
-* joomla
-* redaxo
-* typo3
-* wordpress
-* mediawiki
-
-* oscommerce
-* opencart
-
-* owncloud
-* alfresco
-* mantis
-
-* piwik / matomo
-* loganalyzer
-* goaccess
-* nagios / icinga
-
-### Servers
-
-* apache
-* nginx
-
-* mariadb / mysql
-* postfix
-* postgis
-
-* geoserver
-
-<!--
-## Tools / Servers
-    openlayers
-    git / gitweb / stagit / gitolite
-    xmpp
-    mumble
-    docker / registry
-    kvm
-    kubernetes
-    postfix/dovecot / rouncube/postfixadmin
-    symfony
-    bootstrap
-    webGL
-    websockets
-    ajax
-    node/angular
-    jmeter
-    ceph
--->
-
-Compilation Notes
------------------
-
-### build your own webkit
-
-    March 14, 2018
-
-Let’s compile a release with debug info and install to /usr/local
-
-~~~~~~ {.bash}
-wget https://webkitgtk.org/releases/webkitgtk-2.20.0.tar.xz
-tar -xvf webkitgtk-2.20.0.tar.xz
-cd webkitgtk-2.20.0
-# install all the libs that will be reported missing in the next step.
-# I could not find the woff2 stuff in debian so skipped it... 
-cmake -DPORT=GTK -DCMAKE_BUILD_TYPE=RelWithDebInfo -DUSE_WOFF2=NO -GNinja
-# this takes about 30minutes on my i7-4790K .. zzzzz..zzz
-ninja
-sudo ninja install
-~~~~~~~~~~~
-
-    pkg-config
-
-    pkg-config uses our new build now:
-
-    [1] https://trac.webkit.org/wiki/BuildingGtk
-    [2] https://webkitgtk.org/
-
-### Build and Install GCC
-
-    April 27, 2015
-
-#### Preparations
-Read the prequisites at 
-[https://gcc.gnu.org/install/prerequisites.html](https://gcc.gnu.org/install/prerequisites.html) 
-and get (most recent versions at time of  this writing) the following:
-
-* gcc (5.2.0)
-* binutils (2.25.1)
-
-#### Configure and Build
-
-* unpack binutils-x.y.z
-* create a new directory binutils-x.y.z-build and inside it run the following commands:
-
-~~~~~~ {.bash}
-    $ ../binutils-x.y.z/configure --disable-nls --with-sysroot --enable-targets=all
-    $ make -j4
-    $ make install
-~~~~~~~~~~~~
-
-* unpack gcc-x.y.z and run the contrib/download_prerequisites script inside.
-* create a new directory: gcc-x.y.z-build and inside it run:
-    
-~~~~~~ {.bash}
-    $ ../gcc-x.y.z/configure --disable-nls --enable-languages=c,c++ --enable-threads
-    $ make -j4
-    $ make install
-~~~~~~~~~~~~
-
-#### Reference
-    [1] binutils and gcc README files.
-    [2] https://gcc.gnu.org/install/
-    [3] http://wiki.osdev.org/Building_GCC
-    [4] http://stackoverflow.com/questions/1726042/recipe-for-compiling-binutils-gcc-together
-
-monad transformers in action
-----------------------------
-    January 1,2018 
-    
-    *Main Control.Monad.Writer Control.Monad.State> runState (runWriterT  (get >>= \a -> tell ["foo"] >> put (a*a) >> tell ["bar"] >> tell [show a])) 5
-
-emscripten
-----------
-    October 1,2017
-
-    sdl2 port
-    https://github.com/juj/emsdk
-    android-ndk-r15c
-
-    * accomplish build sys with: sdl2+input+audio+opengl+SDL_net+SDL_thread @ linux, win, osx, ios, android, win-phone, steam, rasp
-
-LUKS container over sshfs
--------------------------
-    July 5, 2017
-
-* enable user\_allow\_other in /etc/fuse.conf
-* sshfs -o allow\_root user@server:/BACKUPS/ ~/mnt/
-* dd if=/dev/urandom of=~/mnt/megaloman bs=1M count=512
-* sudo cryptsetup -y luksFormat ~/mnt/megaloman
-* sudo cryptsetup luksOpen ~/mnt/megaloman vol1
-* sudo mkfs.ext4 /dev/mapper/vol1
-* sudo mount /dev/mapper/vol1 /mnt
-* df -h | grep vol1
-* sudo umount /mnt
-* sudo cryptsetup luksClose vol1
-* fusermount -u ~/mnt
-
-NOTE: backup your data example use : rsync -a –info=progress2 source dist
-
-some areas of interest
-----------------------
-    December 20, 2014
-
-Some General Topics I am reasearching right now (or plan to do it). Or used to reasearch...
-
-* Neuronal Networks
-* Deep Learning
-* Random Forrests (and other techniques based on Decision Trees)
-* Simmulated Annealing
-* (Linear) Integer Programming
-
-
-Inter Process Communication
----------------------------
-    March 14, 2018
-
-We can attach nicely to same memory segment from 2 different processes:
-
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.c .numberLines}
-// ipc via shared mem
-// attach to shared memory;
-key_t my_ftok = ftok("~/surf-webext-dom-shared-mem",'a');
- 
-int mem_seg=shmget(my_ftok,1024*1024,IPC_CREAT|0660);
-if(mem_seg==-1)
-{
-g_print("shmget failed: %s\n",strerror(errno));
-}
- 
-shared_buf=shmat(mem_seg,NULL,0);
-if(shared_buf==(void*)-1)
-{
-g_print("shmat failed: %s\n",strerror(errno));
-}
-g_print("attached to shared memory.\n");
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-SSL Certificate CSR
--------------------
-    
-    February 20, 2015
-
-    for apache ssl mod
-
-    first check your old csr if you like:
-    $ openssl req -text -noout -verify -in CSR.csr
-    
-    1. generate key
-    $ openssl genrsa -des3 -out www.yourdomain-example.com.key 2048
-    
-    2. create CSR
-    $ openssl req -new -key www.yourdomain-example.com.key -out www.yourdomain-example.com.csr
-    
-    refs:
-    [1] https://search.thawte.com/support/ssl-digital-certificates/index?page=content&id=AR1108&actp=LIST
-
-Competitive Coding
-------------------
-    March 17, 2015
-
-A small selection of websites, which I visit from time to time, addressing competitive coding.
-
-* topcoder.com
-* codeforces.com
-* codility.com
-* codersclan.ne
-* projecteuler.net
-* www.codingame.com (need to check this)
-* www.codechef.com (need to check this)
-* http://psyho.gg/overview-of-programming-contests/ (and read here)
-* https://www.hackerrank.com/
-* http://code.google.com/codejam
-* https://www.kaggle.com/ – predicitve modelling
-* odesk.com / elance
-
-Comp Science Literature
------------------------
-    March 17, 2015
-This is a list of some books, focusing on topics around computer science, which I recently read or am currently reading or want to read :P
-
-* Meyers, Effective C++ (Addison-Wesley) C++98 only?
-* Meyers, More Effective C++ (Addison-Wesley) C++98 only?
-* Meyers, Effective STL. C++98 only?
-* Sutter, Exceptional C++
-* Sutter, More Exceptional C++
-* Karlson, Beyond the C++ Standard Library: An Introduction to Boost 1st Edition
-* Maybe Something on Multiprocessing (?)
-* Donald Knuth. The Art Of Computer Programming
-* Algorithms 3rd Edition (by Cormen, Leiserson, Rivest, Stein)
-* Jonathan Bartlett. Programming from the Ground Up
-* C++ in a Nutshell (O’REILLEY, by Lischner)
-* C++ Primer (5th Edition) by Lippman, Lajoie, Moo
-* The C++ Programming Language 4th Edition
-* Anthony Williams, C++ Concurrency in Action: Practical Multihreading
-* Dive into Python (2 and 3) by Mark Pilgrim
-* Learn You a Haskell for Great Good by Marian Lipovaca
-* Real World Haskell
-* Version Control with Git (O’REILLEY, by Loeliger & McCullough) (next: 9(10) ?)
-* The Linux Command Line, by William Shotts (http://linuxcommand.org/tlcl.php)
-* Debian, The Administrators Handbook (by Hertzog and Mas)
-* Absolute FreeBSD by Michael W. Lucas
-* Modern Operating Systems, Third Edition (by Andrew S. Tannebaum)
-* Linux Device Drivers (O’REILLEY, by Corbert, Rubini, Kroah-Hartman)
-* Linux Kernel in a Nutshell (O’REILLEY,  Greg Kroah-Hartman)
-
-* Concrete Math (2nd)
-* UPENN cis194
-
-* STOC '83 Proceedings of the fifteenth annual ACM symposium on Theory of computing / Primitives for the manipulation of general subdivisions and the computation of Voronoi diagrams
-
-* http://haskellbook.com/
-* Wadler paper "Monads for Functional Programming"
-* simon marlow - book (parallel)
-* data 6 - course (Github)
-* sedgewick & waynes algorithms
-* books from appendix, from programming from ground up?
-
-VNC
----
-    April 2, 2015
-
-### Server:
-    $ apt-get install tightvncserver
-    $ xtightvncserver -geometry 1900×1100
-    $ netstat -tap | grep vnc # remember port (e.g.5901)
-
-### Client:
-    $ ssh -L 5901:localhost:5901 you@remote # tunnel
-    $ xtightvncviewer localhost::5901 # in new terminal
-
-### Kill Server:
-    $ vncserver -kill :1 # (or :2 etc..)
-
-Owncloud Notes
---------------
-
-### Mounting Ownclouds DavFS
-
-    April 15, 2015
-
-    $ apt-get install davfs2
-
-    * since owncloud seems to have problems with locks, edit /etc/davfs2/davfs2.conf and set use_locks to 0 in order to allow creating files (as well as probably writing)
-
-    $ mount -t davfs https://secure.sf.com/owncloud/remote.php/webdav /mnt/
-
-### rescan/rebuild ownlocud files database
-
-    June 22, 2016
-
-    inside ownlcoud  directory run:
-    sudo -u www-owncloud php console.php files:scan –all
-
-
-LXC
----
-    April 28, 2015
-
-    maybe worth a try:
-
-    apt-get install lxc; lxc create ctname -t download — -d debian -r jessie
-    -a amd64; lxc-start -d -n ctname, lxc-attach ctname
-
-    similar tools: chroot/ debootsrap
-
-Add vim Lang
-------------
-    May 14, 2015 
-
-    $ sudo apt-get install myspell-pl
-    $ cd /ush/share/hunspell
-    $ vim
-    :mkspell pl pl_PL
-
-What every programmer should know about
----------------------------------------
-    November 7, 2015
-
-    Undefined behaviour: http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
-    Memory: http://lwn.net/Articles/250967/
-    Floating point arithmetic: https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
-
-IDE Comparison
---------------
-
-    December 7, 2015
-
-While I love working with vim (ctags, taglist, etc..) and the command line, it might be worth to have a look at the following IDE’s for Java and/or C++:
-
-* IntelliJ IDEA
-* Eclipse
-* Eclipse CDT
-* Codeblocks
-* Netbeans
-* Codelite
-* KDevelop
-
-Setup Postfix
--------------
-
-We want to handle different domains on a single postfix server and have virtual users along real unix users. For the virtual users we use uid/gid 5000.
-
-Relevant config files are:
-
-    /etc/postfix/master.cf
-    /etc/postfix/main.cf
-    /etc/postfix/smtpd_sender_login_maps (tells which emails belong to which login)
-    /etc/postfix/vmailbox (sepcifies our VIRTUAL mailboxes and the names of the spoolfiles)
-    /etc/postfix/virtual (aliases for our local unix users)
-    /etc/dovecot/users (specifies the logins, passwords, home directories,..)
-    /etc/dovecot/conf.d/10-mail (set inbox and mailbox dirs)
-
-Be careful about the permissions of the different folders, so uid/gid 5000, postfix and dovecot can access as relevant.
-
-A very nice tutorial on setting up postfixadmin can be found here: 
-
-    https://lelutin.ca/posts/installing_postfix_-_clamav_-_spamassassin_-_dovecot_-_postfixadmin_on_debian_squeeze/
-
-Windows Specific Notes
-----------------------
-
-### disable hiberfile.sys
-
-    September 7, 2017
-
-    run cmd.exe as administrator:
-    powercfg.exe -h off
-
-### GTA4 on NVIDIA-GTX 980
-
-    April 17, 2016
-
-    Add following flags : -nomemrestrict -norestriction
-    Otherwise video memory is not identified correctly.
-
-### Civilization 4 BTS Autosaves
-
-    September 23, 2016
-
-    In the file: C:\Users\miguel\Documents\My Games\Beyond the Sword\CivilizationIV
-
-    Adjust:
-
-    ; The maximum number of autosaves kept in the directory before being deleted.
-    MaxAutoSaves = 100
-
-    ; Specify the number of turns between autoSaves. 0 means no autosave.
-    AutoSaveInterval = 1
-