$ composer global require "laravel/installer"
...
Installation failed, deleting ./composer.json.
The following exception is caused by a lack of memory or swap, or not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details

The following exception is caused by a lack of memory or swap, or not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details

PHP Warning:  proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 979

Warning: proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 979
...

$ free -m
              total        used        free      shared  buff/cache   available
Mem:            993         466         368          12         157         378
Swap:             0           0           0

$ /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
/bin/dd: failed to open ‘/var/swap.1’: Permission denied

$ sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
[sudo] password for iosdevlog:
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 10.3394 s, 104 MB/s

$ sudo /sbin/mkswap /var/swap.1
Setting up swapspace version 1, size = 1048572 KiB
no label, UUID=607af6e2-b5cc-4fe9-880d-7924e188e303

$ sudo /sbin/swapon /var/swap.1
swapon: /var/swap.1: insecure permissions 0644, 0600 suggested.

$ free -m
              total        used        free      shared  buff/cache   available
Mem:            993         467          72          12         453         367
Swap:          1023           0        1023

$ composer global require "laravel/installer"

$ vim ~/.zshrc
export PATH="$HOME/.config/composer/vendor/bin:$PATH"

$ laravel new blog # or composer create-project --prefer-dist laravel/laravel blog
$ cd laravel
$ php artisan serve &
Laravel development server started: <http://127.0.0.1:8000>
$ w3m http://localhost:8000

$ cd /etc/yum.repos.d/
$ sudo wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
$ sudo yum search virtualbox
=========================== N/S matched: virtualbox ============================
VirtualBox-4.3.x86_64 : Oracle VM VirtualBox
VirtualBox-5.0.x86_64 : Oracle VM VirtualBox
VirtualBox-5.1.x86_64 : Oracle VM VirtualBox
$ sudo yum install VirtualBox-5.1
$ virtualbox
WARNING: The vboxdrv kernel module is not loaded. Either there is no module
available for the current kernel (3.10.0-327.36.3.el7.x86_64) or it failed to
load. Please recompile the kernel module and install it by

sudo /sbin/vboxconfig

You will not be able to start VMs until this problem is fixed.
Qt FATAL: QXcbConnection: Could not connect to display
[1]    10716 abort      virtualbox

$ uname -r
3.10.0-327.36.3.el7.x86_64
$ sudo yum install kernel kernel-headers kernel-devel gcc make
Installed:
  kernel.x86_64 0:3.10.0-693.2.2.el7  kernel-devel.x86_64 0:3.10.0-693.2.2.el7

Updated: 
  kernel-headers.x86_64 0:3.10.0-693.2.2.el7 kexec-tools.x86_64 0:2.0.14-17.el7

$ ls /usr/src/kernels/
3.10.0-693.2.2.el7.x86_64

$ uname -r
3.10.0-327.36.3.el7.x86_64

$ sudo usermod -a -G vboxusers iosdevlog
$ sudo virtualbox & # use root install extension, if you want GUI, see below

$ sudo yum install vagrant_2.0.0_x86_64.rpm
$ vagrant box add laravel/homestead # slow
$ cat homestead.json
{
    "name": "laravel/homestead",
        "versions":
            [
            {
                "version": "3.1.0",
                "providers":
                    [
                    {
                        "name": "virtualbox",
                        "url": "/home/iosdevlog/php/virtualbox.box"
                    }
                    ]
            }
            ]
}
$ vagrant box add homestead.json

$ git clone https://github.com/laravel/homestead.git Homestead
$ cd Homestead
$ bash init.sh
$ vim Homestead.yaml

---
ip: "192.168.10.10"
memory: 2048
cpus: 1
provider: virtualbox

authorize: ~/.ssh/id_rsa.pub

keys:
- ~/.ssh/id_rsa

folders:
- map: ~/code/laravel
to: /home/vagrant/code

sites:
- map: homestead.localhost
to: /home/vagrant/code/Lavavel/public

databases:
- homestead

$ ssh-keygen -t rsa -C "iosdevlog@iosdevlog.com"
$ sudo vim /etc/hosts
192.168.10.10  homestead.localhost

$ cd ~/Homestead
$ vagrant up
$ vagrant ssh
$ cd ~/code
$ composer create-project laravel/laravel Laravel

$ sudo -s
# yum check-update
# yum groupinstall "X Window System"
# yum install gnome-classic-session gnome-terminal nautilus-open-terminal control-center liberation-mono-fonts

# unlink /etc/systemd/system/default.target
# ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
# reboot

# yum install tigervnc-server -y
# cp /lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@:1.service
# vim /etc/systemd/system/vncserver@:1.service

[Service]
Type=forking
User=iosdevlog # you username

# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=-/usr/bin/vncserver -kill %i
ExecStart=/usr/bin/vncserver %i
PIDFile=/home/iosdevlog/.vnc/%H%i.pid # you username
ExecStop=-/usr/bin/vncserver -kill %i

# systemctl daemon-reload
# su iosdevlog
$ sudo vncpasswd

$ sudo systemctl enable vncserver@:1.service

$ sudo systemctl start vncserver@:1.service

$ sudo systemctl enable vncserver@:1.service

$ sudo systemctl start vncserver@:1.service