@ubuntu:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 19G 17G 1020M 95% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 745M 4.0K 745M 1% /dev tmpfs 151M 1.3M 150M 1% /run none 5.0M 0 5.0M 0% /run/lock none 755M 220K 755M 1% /run/shm none 100M 48K 100M 1% /run/user
Disk /dev/sda: 42.9 GB, 42949672960 bytes 255 heads, 63 sectors/track, 5221 cylinders, total 83886080 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000ea50f Device Boot Start End Blocks Id System /dev/sda1 * 2048 39845887 19921920 83 Linux /dev/sda2 39847934 41940991 1046529 5 Extended /dev/sda5 39847936 41940991 1046528 82 Linux swap / Solaris
bay@ubuntu:~$ free -m
total used free shared buffers cached
Mem: 1508 1065 443 5 74 419
-/+ buffers/cache: 572 936
Swap: 1021 0 1021
root@ubuntu:# swapoff -a
root@ubuntu:# free -m
total used free shared buffers cached
Mem: 1508 1075 433 5 73 419
-/+ buffers/cache: 581 926
Swap: 0 0 0
root@ubuntu:# fdisk /dev/sda Command (m for help): p Disk /dev/sda: 42.9 GB, 42949672960 bytes 255 heads, 63 sectors/track, 5221 cylinders, total 83886080 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000ea50f Device Boot Start End Blocks Id System /dev/sda1 * 2048 39845887 19921920 83 Linux /dev/sda2 39847934 41940991 1046529 5 Extended /dev/sda5 39847936 41940991 1046528 82 Linux swap / Solaris Command (m for help): d Partition number (1-5): 1 Command (m for help): d Partition number (1-5): 2 Command (m for help): p Disk /dev/sda: 42.9 GB, 42949672960 bytes 255 heads, 63 sectors/track, 5221 cylinders, total 83886080 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000ea50f Device Boot Start End Blocks Id System
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-83886079, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-83886079, default 83886079): 82869552
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (1-4, default 2): 2
First sector (82839553-83886079, default 82839553):
Using default value 82839553
Last sector, +sectors or +size{K,M,G} (82839553-83886079, default 83886079):
Using default value 83886079
Command (m for help): p
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders, total 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ea50f
Device Boot Start End Blocks Id System
/dev/sda1 2048 82839552 41418752+ 83 Linux
/dev/sda2 82839553 83886079 523263+ 83 Linux
Command (m for help): t Partition number (1-4): 2 Hex code (type L to list codes): 82 Changed system type of partition 2 to 82 (Linux swap / Solaris)
Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks.
root@ubuntu:/home/bay# awk '/swap/ { print $1 }' /etc/fstab
#
UUID=990ae69c-2bbe-425f-bb8f-91200f70c9b9
[html] view plain copy
root@ubuntu:# swapoff -a
root@ubuntu:# free -m
total used free shared buffers cached
Mem: 1508 1171 337 6 191 424
-/+ buffers/cache: 555 953
Swap: 0 0 0
root@ubuntu:# dd if=/dev/zero of=/dev/sda2
dd: writing to ‘/dev/sda2': No space left on device
1046528+0 records in
1046527+0 records out
535821824 bytes (536 MB) copied, 1.89975 s, 282 MB/s
root@ubuntu:# mkswap -U 990ae69c-2bbe-425f-bb8f-91200f70c9b9 /dev/sda2
Setting up swapspace version 1, size = 523256 KiB
no label, UUID=990ae69c-2bbe-425f-bb8f-91200f70c9b9
root@ubuntu:# swapon -a
root@ubuntu:# free -m
total used free shared buffers cached
Mem: 1508 717 790 6 6 164
-/+ buffers/cache: 546 961
Swap: 510 0 510
root@ubuntu:# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 19G 17G 1023M 95% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 745M 12K 745M 1% /dev
tmpfs 151M 1.3M 150M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 755M 152K 755M 1% /run/shm
none 100M 48K 100M 1% /run/user
root@ubuntu:# resize2fs /dev/sda1
resize2fs 1.42.9 (4-Feb-2014)
Filesystem at /dev/sda1 is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 3
The filesystem on /dev/sda1 is now 10354688 blocks long.
root@ubuntu:# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 39G 17G 21G 45% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 745M 12K 745M 1% /dev
tmpfs 151M 1.3M 150M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 755M 152K 755M 1% /run/shm
none 100M 48K 100M 1% /run/user
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