System O & M skills (3) -- temporarily add swap partitions using dd commands

Sometimes the memory is insufficient. You can use the method provided in this article to temporarily add swap partitions.

# Create swap partition -- get the file [root @ serv01 linux-2.6.38] # dd If =/dev/Zero of =/swap. img bs = 1 m COUNT = 10241024 + 0 records in1024 + 0 records out1073741824 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 kibno 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 cachedmem: 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

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