make addtional swap for reslove Linux Cannot allocate memory

make additional swap for reslove Cannot allocate memory

$ sudo dd if=/dev/zero of=/swap_file1 bs=1024 count=2048000
$ sudo mkswap /swap_file1
$ sudo swapon /swap_file1

check memory increased

$ free -m

remove additional swap

$ sudo swapoff /swap_file1
$ sudo rm /swap_file1
$ sudo vim /etc/fstab

remove this this line, save and quit

/swap_file1 swap swap defaults 0 0