AWS & LINUX - Increase volume and extended ubuntu to utilize the volume

 https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-modify-volume.html

https://man7.org/linux/man-pages/man8/lsblk.8.html#:~:text=lsblk%20lists%20information%20about%20all,udev%20db%20to%20gather%20information.&text=The%20command%20prints%20all%20block,list%20of%20all%20available%20columns.

https://linux-kernel-labs.github.io/refs/heads/master/labs/block_device_drivers.html#:~:text=Block%20devices%20are%20characterized%20by,drives%2C%20RAM%20disks%2C%20etc.&text=To%20simplify%20work%20with%20block,(or%20block%20layer)%20subsystem.

**** create a image of your current instance***

1) On AWS Console, select volume and then increase its disk space.(i.e 20G)

2) Login to your ec2 ubuntu instance(SSH)

3) type df -hT (it will tell you current FileSystem, its type and its %used, and where it is mounted on )

For example 

Filesystem     Type      Size  Used Avail Use% Mounted on

/dev/root      ext4      7.7G  7.5G  258M  97% /

devtmpfs       devtmpfs  7.9G     0  7.9G   0% /dev

tmpfs          tmpfs     7.9G     0  7.9G   0% /dev/shm

tmpfs          tmpfs     1.6G   17M  1.6G   2% /run

tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock

tmpfs          tmpfs     7.9G     0  7.9G   0% /sys/fs/cgroup

/dev/loop0     squashfs   34M   34M     0 100% /snap/amazon-ssm-agent/3552

/dev/loop2     squashfs   56M   56M     0 100% /snap/core18/2253

/dev/loop1     squashfs   25M   25M     0 100% /snap/amazon-ssm-agent/4046

/dev/loop5     squashfs   56M   56M     0 100% /snap/core18/2246

/dev/loop4     squashfs   62M   62M     0 100% /snap/core20/1242

/dev/loop6     squashfs   68M   68M     0 100% /snap/lxd/21545

/dev/loop7     squashfs   43M   43M     0 100% /snap/snapd/14066

/dev/loop9     squashfs   68M   68M     0 100% /snap/lxd/21835

/dev/loop10    squashfs   62M   62M     0 100% /snap/core20/1270

/dev/loop3     squashfs   44M   44M     0 100% /snap/snapd/14295

4) type lsblk (tells u information about tall available block devices such as hard drives. (Your volume)

For exmaple

NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT

loop0     7:0    0 33.3M  1 loop /snap/amazon-ssm-agent/3552

loop1     7:1    0   25M  1 loop /snap/amazon-ssm-agent/4046

loop2     7:2    0 55.5M  1 loop /snap/core18/2253

loop3     7:3    0 43.3M  1 loop /snap/snapd/14295

loop4     7:4    0 61.9M  1 loop /snap/core20/1242

loop5     7:5    0 55.5M  1 loop /snap/core18/2246

loop6     7:6    0 67.3M  1 loop /snap/lxd/21545

loop7     7:7    0 42.2M  1 loop /snap/snapd/14066

loop9     7:9    0 67.2M  1 loop /snap/lxd/21835

loop10    7:10   0 61.9M  1 loop /snap/core20/1270

xvda    202:0    0   20G  0 disk

└─xvda1 202:1    0    8G  0 part /

This tells you partion xvda hard disk is now 20G, and its partion xvda1 which is mounted on "/" folder like /dev/root filesystem only has 8G

5) Grow hard disk by  sudo growpart /dev/xvda 1 (1 stands for partioion #)

6) now type lsblk

NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT

loop0     7:0    0 33.3M  1 loop /snap/amazon-ssm-agent/3552

loop1     7:1    0   25M  1 loop /snap/amazon-ssm-agent/4046

loop2     7:2    0 55.5M  1 loop /snap/core18/2253

loop3     7:3    0 43.3M  1 loop /snap/snapd/14295

loop4     7:4    0 61.9M  1 loop /snap/core20/1242

loop5     7:5    0 55.5M  1 loop /snap/core18/2246

loop6     7:6    0 67.3M  1 loop /snap/lxd/21545

loop7     7:7    0 42.2M  1 loop /snap/snapd/14066

loop9     7:9    0 67.2M  1 loop /snap/lxd/21835

loop10    7:10   0 61.9M  1 loop /snap/core20/1270

xvda    202:0    0   20G  0 disk

└─xvda1 202:1    0   20G  0 part /

Partion has grown to 20G

7) If we check file system it is still the same :  df -hT

Filesystem     Type      Size  Used Avail Use% Mounted on

/dev/root      ext4      7.7G  7.5G  258M  97% /

devtmpfs       devtmpfs  7.9G     0  7.9G   0% /dev

tmpfs          tmpfs     7.9G     0  7.9G   0% /dev/shm

tmpfs          tmpfs     1.6G   17M  1.6G   2% /run

tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock

tmpfs          tmpfs     7.9G     0  7.9G   0% /sys/fs/cgroup

/dev/loop0     squashfs   34M   34M     0 100% /snap/amazon-ssm-agent/3552

/dev/loop2     squashfs   56M   56M     0 100% /snap/core18/2253

/dev/loop1     squashfs   25M   25M     0 100% /snap/amazon-ssm-agent/4046

/dev/loop5     squashfs   56M   56M     0 100% /snap/core18/2246

/dev/loop4     squashfs   62M   62M     0 100% /snap/core20/1242

/dev/loop6     squashfs   68M   68M     0 100% /snap/lxd/21545

/dev/loop7     squashfs   43M   43M     0 100% /snap/snapd/14066

/dev/loop9     squashfs   68M   68M     0 100% /snap/lxd/21835

/dev/loop10    squashfs   62M   62M     0 100% /snap/core20/1270

8) Now ask file system to occupy the space by sudo resize2fs /dev/root

(/dev/root) is file system mounted on "/"

9) now type df -hT

Filesystem     Type      Size  Used Avail Use% Mounted on

/dev/root      ext4       20G  7.5G   12G  39% /

devtmpfs       devtmpfs  7.9G     0  7.9G   0% /dev

tmpfs          tmpfs     7.9G     0  7.9G   0% /dev/shm

tmpfs          tmpfs     1.6G   17M  1.6G   2% /run

tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock

tmpfs          tmpfs     7.9G     0  7.9G   0% /sys/fs/cgroup

/dev/loop0     squashfs   34M   34M     0 100% /snap/amazon-ssm-agent/3552

/dev/loop2     squashfs   56M   56M     0 100% /snap/core18/2253

/dev/loop1     squashfs   25M   25M     0 100% /snap/amazon-ssm-agent/4046

/dev/loop5     squashfs   56M   56M     0 100% /snap/core18/2246

/dev/loop4     squashfs   62M   62M     0 100% /snap/core20/1242

/dev/loop6     squashfs   68M   68M     0 100% /snap/lxd/21545

/dev/loop7     squashfs   43M   43M     0 100% /snap/snapd/14066

/dev/loop9     squashfs   68M   68M     0 100% /snap/lxd/21835

/dev/loop10    squashfs   62M   62M     0 100% /snap/core20/1270

/dev/loop3     squashfs   44M   44M     0 100% /snap/snapd/14295