How to update the GRUB bootloader menu on Linux
To update the grub bootloader on your Linux box, this is another way to do this.
grub-mkconfig > /boot/grub/grub.cfg |
This will update the grub2 bootloader and add any new kernels in /boot.
Creating a new swapfile for your Linux system.
Firstly we create a new file padded with zeros from /dev/zero.
root@deusexmachina:~# dd if=/dev/zero of=swafile bs=1024 count=524288 524288+0 records in 524288+0 records out 536870912 bytes (537 MB) copied, 2.20969 s, 243 MB/s |
Then we enable the file as swap space with the mkswap command.
root@deusexmachina:~# mkswap swafile Setting up swapspace version 1, size = 524284 KiB no label, UUID=f29c3acc-9deb-4213-9350-30cccc455f37 |
Finally, we enable the new swap space as a swap partition, making it available to the system.
root@deusexmachina:~# swapon swafile |
To switch off this new swapfile, you may use the swapoff command to switch it off
root@deusexmachina:~# swapoff swafile |
This is the output of the free command with the swapfile turned on.
root@deusexmachina:~# free total used free shared buffers cached Mem: 5915844 5875940 39904 0 1950988 3376980 -/+ buffers/cache: 547972 5367872 Swap: 5036020 4 5036016 root@deusexmachina:~# |
And this is the output with the swapfile turned off with the swapoff command.
root@deusexmachina:~# free total used free shared buffers cached Mem: 5915844 5848000 67844 0 1942792 3358896 -/+ buffers/cache: 546312 5369532 Swap: 4511736 4 4511732 root@deusexmachina:~# |