Update install scripts to avoid memory issues

[thibaultyou]

sudo dd if=/dev/zero of=/swapfile bs=128M count=32
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
sudo swapon -s
sudo chmod 666 /etc/fstab
sudo echo "/swapfile swap swap defaults 0 0" >> /etc/fstab
sudo chmod 644 /etc/fstab
# sudo echo "512" > /proc/sys/net/core/somaxconn
sudo chmod 666 /etc/sysctl.conf
sudo echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
sudo sysctl vm.overcommit_memory=1
sudo chmod 644 /etc/sysctl.conf