Use the dd command to temporarily add swap partitions

Using the dd command to temporarily add swap partitions sometimes causes insufficient memory. You can use the method provided in this article to temporarily add swap partitions. [Plain] # create swap partition -- get the file [root @ serv01 linux-2.6.38] # dd if =/dev/zero of =/swap. img bs = 1 M count = 1024 1024 + 0 records in 1024 + 0 records out 1073741824 bytes (1.1 GB) copied, 2.68989 s, 399 MB/s [root @ serv01 linux-2.6.38] # ls swap. img # Make swap partition [root @ serv01 linux-2.6.38] # mkswap/swap. img mkswap: swap. img: warning: don't erase bootbits sectors on whole disk. use-f to force. setting up swapspace version 1, size = 1048572 KiB no label, UUID = 70945855-7bab-4c08-a880-77d089dd06cc # enable swap partition to take effect [root @ serv01 linux-2.6.38] # swapon/swap. img # You can use the free command to check whether the increase is successful [root @ serv01 linux-2.6.38] # free total used free shared buffers cached Mem: 384996 378700 6296 33232 249252-/+ buffers/cache: 96216 288780 Swap: 2097136 0 2097136 # Close, then delete [root @ serv01 linux-2.6.38] # swapoff/swap. img [root @ serv01 linux-2.6.38] # rm-rf/swap. img