====== CentOS 7 Install ======

  * download DVD version: https://www.centos.org/download/

  * read this install guide first: http://www.2daygeek.com/centos-7-desktop-installation-steps-with-screenshots/
    * note: the default option is install server edition without GUI, make sure in "Installation Panel"
      * double check the installation summary > software selection, and choose the last one with GU

  * during installer summary, if you want to format existing disk,
    * in "Installation Summary" page, under "System" icon, click "Installation Destination",
      - select the disk
      - under other storage option, select "Auto configure partitioning" and check "I would like to make additional space available", then click "Done" on top left corner
      - in pop-up partition table, select the partition or disk and click "Delete" button to mark as to delete, then click right bottom corner "Reclaim Space" button
    * then you got a clean disk to install, uncheck "I would like to make additional space available" and continue install

  * while installing, set the pass for ROOT user, and set the pass and name for yourself

  * screen shot \\ {{:techwiki:centos:centos_install_panel.png?200|}} {{:techwiki:centos:centos_install_choice.png?200|}} {{:techwiki:centos:centos_install_disk_select.png?200|}}

===== Install Problem and Fix =====

==== Get Everything working in VirtualBox ====

  * [[:appwiki:virtualmachine#guest_addition_and_share_folder_working_guide_of_centos7_vm_on_win7]]

** <del>fix internet connection for virtualbox install</del>(outdate) **

  * check network connection status and find the Ethernet type status with the connection name<code bash>nmcli d</code>
  * edit the config for that connection <code bash>
sudo vi /etc/sysconfig/network-scripts/ifcfg-enp0s3

# add following
DNS1=8.8.8.8
DNS2=8.8.4.4
ONBOOT=yes  
</code>
  * additional note <code>
BOOTPROTO=dhcp # for auto ip get
</code>
  * reset the network by reboot or restart network <code bash>service network restart</code>

** <del>fix mouse integration in VirtualBox install</del> (outdate)**

  - make sure EPEL repo already installed
  - install folowing <code bash>sudo yum install dkms
sudo yum groupinstall "Development Tools"
sudo yum install kernel-devel
</code>
  - restart computer, then install guess tool as usual

==== Fix Yum can't find anything after dropbox install ====

  * Problem:
    * "Loaded plugins: fastestmirror, langpacks http://linux.dropbox.com/fedora/7/repodata/repomd.xml:" and then can't find anything when ask install something.
  * Solution: <code bash>
cd /etc/yum.repos.d/
sudo rm dropbox.repo
</code>

==== USB Wifi not show wifi list ====

  * on the top right corner drop down menu, Wifi setting panel
    * try click on "Connect to Hidden Network", type the Wifi name, security type (most likely wpa2 personal), and pass
    * if not connected after a while, try install wifi <code>yum install NetworkManager-wifi</code>
    * restart, try above again, even though it not show the list, it should still be able to connect.

====== Customize OS ======

===== Other Desktop environment =====


  * desktop environment option and install guide: http://unix.stackexchange.com/questions/181503/how-to-install-desktop-environments-on-centos-7
    * install cmd <code bash>
# gnome: the desktop with (Start menu,Application, Place on top, and taskbar, space on bottom)
yum -y groups install "GNOME Desktop"
startx

# -- use gnome shell mode instead centos default gnome classic mode
echo "exec gnome-session" >> ~/.xinitrc
startx
# -- or in set login and choose from list
systemctl set-default graphical.target

# KDE: windows like bottom (start menu, taskbar, space)
yum -y groups install "KDE Plasma Workspaces" 
echo "exec startkde" >> ~/.xinitrc
startx

# cinnamon: more like windows 7
# Add the EPEL Repository by fedora, set [priority=5] or optionally change to [enabled=0]
yum -y install epel-release
sed -i -e "s/\]$/\]\npriority=5/g" /etc/yum.repos.d/epel.repo
sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/epel.repo
yum --enablerepo=epel install [Package] # if [enabled=0], input a command to use the repository
# install
yum --enablerepo=epel -y install cinnamon*
echo "exec /usr/bin/cinnamon-session" >> ~/.xinitrc
startx

# MATE: basically GNOME 2, looks like windows XP on skin with (Application, Place, System) on top, like old fedora
yum --enablerepo=epel -y groups install "MATE Desktop"
echo "exec /usr/bin/mate-session" >> ~/.xinitrc 
startx

# xfce: looks like above but low quality like
yum --enablerepo=epel -y groups install "Xfce" 
echo "exec /usr/bin/xfce4-session" >> ~/.xinitrc 
startx

</code>

===== install MATE lightweight desktop environment =====

  - get fedora repo with ask yes <code bash>sudo yum install epel-release</code>
  - get all user install MATE <code bash>sudo yum groupinstall "MATE Desktop"</code>
  - restart and login button gear icon will give the choice list now \\ {{:techwiki:centos:centos_login_desktop.png?200|}}
  - if you want uninstall <code bash>sudo yum groupremove "MATE Desktop"</code>


=====disable alt move window hotkey=====

  * control panel > Window > Behavior, change alt key to super key \\ {{:techwiki:centos:linux_setting_window_move.png?600|}}

=====create system shortcut=====

  * Settings >> keyboard >> click "+" at the bottom
    * example: 
      * name as terminal, command as 
        * for gnome 3 desktop <code>gnome-terminal</code> 
        * for mate desktop <code>mate-terminal</code>
      * shortcut as Ctrl+F2

====== Install Library ======

<code bash>
sudo yum install libGLU
</code>

====== Install App list ======

**Firefox Update**
  * cmd <code bash>sudo yum update firefox</code>

**Dukto - lan transfer tool**
  * go download: https://software.opensuse.org/download.html?project=home:colomboem&package=dukto
    * on the page, choose the your linux distribution type, then choose grab binary, for centos, grab the x86_64 rpm installer.
**filezilla**
  * make sure epel repo installed <code>sudo yum -y install epel-release</code>
  * install filezilla <code>sudo yum -y install filezilla</code>
**CMake**
  - download source code: https://cmake.org/download/
  - unpack and cd to the folder and command (ref: [[https://xinyustudio.wordpress.com/2014/06/18/how-to-install-cmake-3-0-on-centos-6-centos-7/|link]])<code bash>
./bootstrap
gmake
sudo gmake install
cmake --version
</code>

**PySide and PySide2**
  - (For CentOS 7) if you not add this repo yet, than add it <code bash>rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm</code>
  - get pip installed <code>
sudo yum upgrade python-setuptools
sudo yum install python-pip python-wheel
sudo python -m pip install pyside2
</code>
**gvim - GUI vim**
  * install <code>sudo yum install vim-X11 -y</code>
**atom editor**
  * install git <code>sudo yum install wget git -y</code>
  * download rpm atom installer, https://atom.io/
  * if you got nss lib (Network Security Services) version error "NSS_VersionCheck", try install nss library <code>sudo yum install nss</code>
**unrar**
  - (For centos 7) use these cmd to install it <code bash>
## 64 bit linux ##
wget https://www.rarlab.com/rar/rarlinux-x64-5.5.0.tar.gz
tar -zxvf rarlinux-x64-5.5.0.tar.gz
cd rar
sudo cp -v rar unrar /usr/local/bin/
cd ..
rm -r rar
</code>

**7z**
  * method A: yum way <code bash>yum install p7zip</code>
  * method B: manual way:
    - make sure you have the dev tool already, skip if you have <code bash>
yum install gcc gcc-c++ bzip2
</code>
    - compile and install 7z <code bash>
curl -L https://sourceforge.net/projects/p7zip/files/latest/download?source=files -o 7zip.tar.bz2
tar xjvf 7zip.tar.bz2 ; rm -f 7zip.tar.bz2 ; cd $(ls -1t | grep p7zip_ | head -1)
cp makefile.linux_amd64 makefile.linux
make -j $(grep processor /proc/cpuinfo | wc -l) all_test
sudo ./install.sh
cd ..
</code>
    - remove the download source file and package if you want

**Apache web server**
  - install <code>sudo yum install httpd mod_ssl</code>
  - start server <code>sudo /usr/sbin/apachectl start</code>
  - add firewall to allow port 80 <code>sudo iptables -I INPUT -p tcp --dport 80 -j ACCEPT</code>
  - enable /var/www folder writting
====== ref ======

  * https://www.tecmint.com/things-to-do-after-minimal-rhel-centos-7-installation/

====== Problem and Fix ======

  * Problem: yum lock when trying install
    * solution: turn off auto update on startup