[root@docker01 appserver]# lvextend -L 5g /dev/mapper/root--vg-var
Size of logical volume root-vg/var changed from 3.00 GiB (768 extents) to 5.00 GiB (1280 extents).
Logical volume root-vg/var successfully resized.
[root@docker01 appserver]# resize2fs /dev/mapper/root--vg-var
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/root--vg-var
Couldn't find valid filesystem superblock.
[root@docker01 ~]# mount |grep root--vg-var
/dev/mapper/root--vg-var on /var type xfs (rw,relatime,attr2,inode64,noquota)
[root@docker01 appserver]# xfs_growfs /dev/mapper/root--vg-var
meta-data=/dev/mapper/root--vg-var isize=512 agcount=4, agsize=196608 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=786432, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 786432 to 1310720
[root@docker01 appserver]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 899M 0 899M 0% /dev
tmpfs 910M 0 910M 0% /dev/shm
tmpfs 910M 9.6M 901M 2% /run
tmpfs 910M 0 910M 0% /sys/fs/cgroup
/dev/mapper/root--vg-root 5.0G 70M 5.0G 2% /
/dev/mapper/root--vg-usr 4.0G 1.5G 2.5G 38% /usr
/dev/mapper/root--vg-home 4.0G 33M 4.0G 1% /home
/dev/mapper/root--vg-opt 4.0G 33M 4.0G 1% /opt
/dev/mapper/root--vg-var 5.0G 1.8G 3.3G 35% /var