free VPN Service

vpnbook 2019 https://www.vpnbook.com/
  Username: vpnbook
  Password: rktbz9c


vpnbook (http://www.vpnbook.com/)
  Username: vpnbook
  Password: adv7ebeh
  .ovpn files  http://www.vpnbook.com/free-openvpn-account/VPNBook.com-OpenVPN-Euro1.zip

getusvpn (http://www.getusvpn.com/)

Notes:
After download OpenVPN Cliente on W7, run link (desktop) as Administrator.


References:

[1]  top 5 http://www.zeropaid.com/news/94826/top-5-free-vpn-services/
[2] http://www.tuvpn.com/es/tutoriales/openvpn-en-windows7#step-0
[3] Setting openvpn - ES https://hide.me/es/vpnsetup/ubuntu/openvpn/

Ubuntu Services

sudo service --status-all


https://askubuntu.com/questions/912216/16-04-command-to-list-all-services-started-on-boot/912218

Linux small distro

Damn Small Project (bad)
Lubuntu 
Linux Lite (based on Ubuntu/Testing)
Tiny Core (Testing), works for Raspberry Pi
  Download:
  Installation GUI:
 

 $tce-load -wi Xvesa.tcz Xlibs.tcz Xprogs.tcz aterm.tcz flwm_topside.tcz wbar.tcz

 $tce-load -wi Xorg-7.7 #if Xvesa not found 

References:
[1] List of popular distros https://itsfoss.com/lightweight-linux-beginners/
[2] Comparison https://en.wikipedia.org/wiki/Light-weight_Linux_distribution
[3] Tiny Core installation https://iotbytes.wordpress.com/install-microcore-tiny-linux-on-local-disk/
[4] Tiny Core Packages http://distro.ibiblio.org/tinycorelinux/7.x/x86/tcz/
[5] Tiny Core Addin desktop http://wiki.tinycorelinux.net/wiki:adding_a_desktop_to_microcore
[6] WBar http://lxlinux.com/wbar.html

Ancho de Banda / Bandwidth Meter

Referencias
[1] www.speedtest.net
[2] http://openspeedtest.com
[3] https://www.meter.net

Ubuntu 16 - Setting PDF Printer

List of printers installed
$ls /etc/cups/ppd

Manually
Device URI:cups-pdf:/

By Command Line (Partial tested)

lpadmin -h localhost -p cups-pdf -v cups-pdf:/ -P /usr/share/cups/model/CUPS-PDF.ppd -E

Setting file (output/destination)
/etc/cups/cups-pdf.conf

Status Idle - File "/usr/lib/cups/backend/cups-pdf" has insecure permissions

$chmod 700 /usr/lib/cups/backend/cups-pdf

Null Printer
Device URI: file:/dev/null


References:
[1] Complete info https://en.opensuse.org/SDB:Printing_to_PDF

[2] openSUSE compile cups-pdf and ppd file https://pawn.physik.uni-wuerzburg.de/~vrbehr/cups-pdf/documentation.shtml
[3] CUPS PDF-WRITER Backend on Suse https://www.novell.com/coolsolutions/feature/17636.html

[4] Fake printer https://superuser.com/questions/304670/how-to-add-a-fake-dummy-null-printer-in-cups
[5] Install cups-pdf http://www.debianadmin.com/howto-install-and-customize-cups-pdf-in-debian.html

Fedora 29 Network Settings

References:
[1] https://alchemist.digital/articles/configure-a-static-ip-address-on-fedora-24-25/

Fedora 29 firewalld settings

$sudo service firewalld start 

$sudo firewall-cmd --list-all

$sudo firewall-cmd --get-zones

$sudo sudo firewall-cmd --zone=home --list-all

$sudo firewall-cmd --get-default-zone

$sudo firewall-cmd --get-active-zones

$sudo firewall-cmd --add-port=8081/tcp --permanent 
$sudo firewall-cmd --add-port=8081/udp --permanent 

$sudo firewall-cmd --reload  #important in Fedora 23 (VPS)
 
 
 
References:
[1] firewall-cmd https://docs.fedoraproject.org/en-US/Fedora/19/html/Security_Guide/sec-Open_Ports_in_the_firewall-CLI.html
[2] other firewall-cmd https://www.hiroom2.com/2017/07/12/fedora-26-firewalld-en/
[3] zones https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

Fedora - mySQL restoring root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

#service mysqld stop // id doesn't stop run #mysqladmin -u root -p shutdown

#mysqld_safe --skip-grant-tables &

#mysql -u root 

> use mysql;

> update user set password=PASSWORD("mynewpassword") where User='root';

> flush privileges;

> quit

#service mysqld stop 

#service mysqld start &

if mysqld_safe not exist (updated 2019)
# systemctl stop mysqld
# systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"
# systemctl start mysqld
$ mysql -u root
get temporaly password (updated 2019)

$sudo grep 'temporary password' /var/log/mysqld.log

A temporary password is generated for root@localhost: cvcvcv 

$mysql -u root -p 

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; 

https://dev.mysql.com/doc/refman/8.0/en/linux-installation-yum-repo.html
reference:
http://www.rackspace.com/knowledge_center/article/mysql-resetting-a-lost-mysql-root-password

Ubuntu 18 add Samba

References:
[1] https://websiteforstudents.com/samba-setup-on-ubuntu-16-04-17-10-18-04-with-windows-systems/

Monitor network bandwidth on Linux server

References:
[1] https://www.binarytides.com/linux-commands-monitor-network/

Ubuntu upgrade from i386 to x86_64

https://askubuntu.com/questions/5018/is-it-possible-to-upgrade-from-a-32bit-to-a-64bit-installation

pip3 ImportError: cannot import name 'main'

In linux you need to change the file: /usr/bin/pip3 from:

from pip import main
if __name__ == '__main__':
    sys.exit(main())

to:

from pip import __main__
if __name__ == '__main__':
    sys.exit(__main__._main())

 

 

Linux: mount folder to different folders

Code:

mount -o bind /media/disk1/pictures /home/user1/pictures
mount -o bind /media/disk1/pictures /home/user2/pictures

for add a fstab entry to auto-mount at startup.

Code:

/media/disk1/pictures /home/add1cker/pictures none defaults,bind 0 0

git commands

References:
[1] https://git-scm.com/book/en/v2/Git-Branching-Basic-Branching-and-Merging

Ubuntu 16 Setting Screen Samsung SyncMaster T240M

$cvt 1600 1000 #get right values for this resolution
$gtf 1600 1000 60 #alternative


# 1600x1000 59.87 Hz (CVT 1.60MA) hsync: 62.15 kHz; pclk: 132.25 MHz
Modeline "1600x1000_60.00" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync
 
$ sudo xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync  #define

$ sudo xrandr --addmode DVI-I-1 "1600x1000" #register on system

$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 16384 x 16384
DVI-I-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95 +
1600x1200 60.00
1280x1024 75.02 60.02
1280x960 60.00
1152x864 75.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
1600x900 59.95*
1600x1000 59.87
DVI-I-2 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
1600x900_60.00 (0x58e) 118.250MHz -HSync +VSync
h: width 1600 start 1696 end 1856 total 2112 skew 0 clock 55.99KHz
v: height 900 start 903 end 908 total 934 clock 59.95Hz

* Set permanent settings using ~/.xprofile (for example)
$vi ~/.xprofile
#
xrandr --newmode "1600x1000" 132.25 1600 1696 1864 2128 1000 1003 1009 1038 -hsync +vsync 
xrandr --addmode DVI-I-1 "1600x1000"


* Problem: After nvidia drivers installation this doesn't works (crap)



$xrandr --fb 1600x1000 #show
xrandr: specified screen 1900x1000 not large enough for output DVI-I-3 (1920x1200+0+0)
xrandr: Configure crtc 0 failed
X Error of failed request:  BadValue (integer parameter out of range for operation)
#or
X Error of failed request:  BadMatch (invalid parameter attributes)

$xrandr --output DVI-I-3 --scale 1x0.85  #this solve  after nvidia drivers installation



References:
http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/

Nvidia and Opengl doesn't works

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

Prepare removing

• sudo apt-get purge nvidia* #This will remove your current nVidia drivers
• sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
• sudo dpkg-reconfigure xserver-xorg #This should fix Xorg
• sudo update-alternatives --remove gl_conf /usr/lib/nvidia-current/ld.so.conf

After this reïnstall nVidia software

• sudo apt-add-repository ppa:xorg-edgers/ppa #provides the necessary repository
• sudo apt-get update
• sudo apt-get install bumblebee-nvidia nvidia-319 nvidia-settings-319

Alternatives to shazam

[1] On web https://www.midomi.com
[2] Get song name from mp3 on web  http://audiotag.info
[3] Chrome plugin https://www.aha-music.com/

Linux Microphone doesn't working

Try to reload drivers

$sudo alsa force-reload

restart device and check if sound is workin? if it doesnt do this:

$sudo apt-get remove --purge alsa-base pulseaudio
$sudo apt-get install alsa-base pulseaudio 

References:
[1] https://askubuntu.com/questions/508221/sound-input-device-microphone-not-working

Fedora/CentOS Change ports of Apache Web Server (httpd)

1) In file /etc/httpd/conf/httpd.conf

Listen 80
Listen 8079

This till your server to listen to the port 8079

2) virtual host file  /etc/httpd/conf.d/vhost.conf

<VirtualHost *:8079>
 DocumentRoot /var/www/html/api_folder
 ServerName example.com
 ServerAlias www.example.com
 ServerAdmin root@example.com 
 ErrorLog logs/www.example.com-error_log
 CustomLog logs/www.example.com-access_log common
</VirtualHost>

This mean when you go to your www.example.com:8079 redirect to
/var/www/html/api_folder

3) Restart the service

$sudo service httpd restart
$systemctl restart httpd.service

references:
[1] https://httpd.apache.org/docs/2.4/bind.html

Ubuntu Hard Drive Health Monitor

HDD Verification tool

$sudo apt-get install smartmontools
$sudo apt-get install gsmartcontrol

$sudo smartctl --all /dev/sda