Resizing a filesystem in Linux to reflect new EBS volume size

Resizing the filesystem on linux

[root@ip-10-0-0-242 opt]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/xvda: 8589 MB, 8589934592 bytes, 16777216 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 label type: gpt


#         Start          End    Size  Type            Name
 1         4096     16777182      8G  Linux filesyste Linux
128         2048         4095      1M  BIOS boot parti BIOS Boot Partition

Disk /dev/xvdb: 536.9 GB, 536870912000 bytes, 1048576000 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

[root@ip-10-0-0-242 opt]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      7.8G  2.9G  4.8G  38% /
devtmpfs         15G   64K   15G   1% /dev
tmpfs            15G     0   15G   0% /dev/shm
/dev/xvdb       197G  173G   15G  93% /vol


The /dev/xvdb still shows 200GB even though it has been upgraded to 500 GB (fdisk)

Following are the commands to resizing the filesystem


[root@ip-10-0-0-242 opt]# mount
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
/dev/xvda1 on / type ext4 (rw,noatime,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=15427064k,nr_inodes=3856766,mode=755)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,relatime)
/dev/xvdb on /vol type ext4 (rw,noatime,data=ordered)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)

[root@ip-10-0-0-242 opt]# mkfs.ext4 /dev/xvdb
mke2fs 1.42.12 (29-Aug-2014)
/dev/xvdb contains a ext4 file system
 last mounted on /vol on Fri Jul  1 10:59:32 2016
Proceed anyway? (y,n) y
/dev/xvdb is mounted; will not make a filesystem here!

[root@ip-10-0-0-242 opt]# umount /dev/xvdb
[root@ip-10-0-0-242 opt]# resize2fs /dev/xvdb
resize2fs 1.42.12 (29-Aug-2014)
Please run 'e2fsck -f /dev/xvdb' first.

[root@ip-10-0-0-242 opt]# e2fsck -f /dev/xvdb
e2fsck 1.42.12 (29-Aug-2014)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/xvdb: 73444/13107200 files (2.1% non-contiguous), 46060290/52428800 blocks

[root@ip-10-0-0-242 opt]# resize2fs /dev/xvdb
resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/xvdb to 131072000 (4k) blocks.
The filesystem on /dev/xvdb is now 131072000 (4k) blocks long.

[root@ip-10-0-0-242 opt]# mount -a
[root@ip-10-0-0-242 opt]# mount
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
/dev/xvda1 on / type ext4 (rw,noatime,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=15427064k,nr_inodes=3856766,mode=755)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,relatime)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)
/dev/xvdb on /vol type ext4 (rw,noatime,data=ordered)

[root@ip-10-0-0-242 opt]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      7.8G  2.9G  4.8G  38% /
devtmpfs         15G   64K   15G   1% /dev
tmpfs            15G     0   15G   0% /dev/shm
/dev/xvdb       493G  173G  295G  37% /vol
[root@ip-10-0-0-242 opt]#