Procedure To Add a Swap File
You need to use the dd command to create swap file. The mkswap command is used to set up a Linux swap area on a device or in a file.a) Login as the root user.
b) Type following command to create 512MB swap file (1024 * 512MB = 524288 block size):
# dd if=/dev/zero of=/swapfile1 bs=1024 count=524288
c) Set up a Linux swap area:
# mkswap /swapfile1
d) Activate /swapfile1 swap space immediately:
# swapon /swapfile1
e) To activate /swapfile1 after Linux system reboot, add entry to /etc/fstab file. Open this file using a text editor such as vi:
# vi /etc/fstab
Append the following line:
/swapfile1 swap swap defaults 0 0
So next time Linux comes up after reboot, it enables the new swap file for you automatically.
g) How do I verify swap is activated or not?
Simply use the free command:
$ free -m
See also:
free command
Display free memory size in MB:$ free -m
Output:total used free shared buffers cached Mem: 750 625 125 0 35 335 -/+ buffers/cache: 254 496 Swap: 956 0 956Displays a line containing the totals memory in MB:
$ free -t -m
Output:
total used free shared buffers cached Mem: 750 625 125 0 35 335 -/+ buffers/cache: 253 496 Swap: 956 0 956 Total: 1707 625 1082
vmstat command
Type vmstat command at shell prompt:$ vmstat
Output:
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 0 131620 35432 341496 0 0 42 82 737 1364 15 3 81 1
top command
Type top command at the shell prompt:$ top
Sample outputs:
1 comment:
hi u
When i set " vi /etc/fstab "
I dont see " /swapfile1 swap swap defaults 0 0"
So you check for me?
Thank!
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