Many organizations / projects seem to use the SPEL Linux project's images (https://github.com/plus3it/spel) as a starting point for their OS deployments. Unfortunately, many IT folks starting with these don't know how to resize the LVM volumes and end up just attaching new EBS volumes and moving mount points around. The base SPEL Linux image is only 20GB.
The SPEL folks have a README on how to resize with Cloudinit:
https://github.com/plus3it/spel/blob/master/docs/LargerThanDefaultRootEBS_EL7.md
Here is an alternative way - I won't say this is the "best" way to automate this resizing. But it is straight forward, not error prone, and repeatable on NITRO-based AWS EC2 Instances (i.e. C5/C5d/C5n, M5/M5d/M5n/M5dn, R5/R5d/R5n/R5dn, T3, and P3dn ). This should result in a pleasant experience for folks that are not comfortable resizing by-hand the volumes or messing with Cloudinit.
Enjoy the below:
# Usage:
Just add this text/script to the USERDATA section of the Launch AMI process. This field is located at the bottom of the Step 3: Configure Instance Details when launching an AMI.
On Step 4: Add Storage - Set the base EBS size to 100GB (base image default is 20GB). OPTIONAL: Change Volume Type to gp3 (they are better), default is gp2. If you don't want a 100GB volume, change to smaller or larger, but adjust values as appropriate below in the partition code.
Let the machine launch, wait about 5 min, login, and should be all configured with new volume sizes.
--- CODE FOR USERDATA SECTION BELOW ---
#!/bin/sh
# | __filename__ = "part_SPEL.sh"
# | __author__ = "Craig Poma"
# | __copyright__ = "Craig Poma"
# | __credits__ = ["Craig Poma"]
# | __license__ = "MIT"
# | __version__ = "1.0.0"
# | __maintainer__ = "Craig Poma"
# | __status__ = "Baseline"
#
#
# Used to resize the LVM Volumes on a STIG-Partitioned Enterprise Linux (spel) Image.
# See https://github.com/plus3it/spel for more information about SPEL Linux
#
# Usage:
# Just add this text/script to the USERDATA section of the Launch AMI process. This
# field is located at the bottom of the Step 3: Configure Instance Details when
# launching an AMI.
#
# On Step 4: Add Storage - Set the base EBS size to 100GB (base image default is 20GB).
# OPTIONAL: Change Volume Type to gp3 (they are better), default is gp2.
# If you don't want a 100GB volume, change to smaller or larger, but adjust
# values as appropriate below in the partition code.
#
# Let the machine launch, wait about 5 min, login, and should be all configured with
# new volume sizes.
#
# Current Version as of this post for REDHAT in us-east-1
# spel-minimal-rhel-7-hvm-2021.11.1.x86_64-gp2
# AMI ID ami-09f07db1ca8f3aa50
#
# Current Version as of this post for CENTOS in us-east-1
# spel-minimal-centos-7-hvm-2021.11.1.x86_64-gp2
# AMI ID ami-0bdd497dd5eface89
#
# Assumes you set the base EBS size to 100GB (base image default is 20GB).
# The last partition to extend is / so, by shrinking the 100Gb size you
# shrink / by that ammont. At 100GB, the / volume is 48GB.
# Resulting filesystem looks like the below:
#
# Filesystem Size Used Avail Use% Mounted on
# devtmpfs 16G 0 16G 0% /dev
# tmpfs 16G 0 16G 0% /dev/shm
# tmpfs 16G 532K 16G 1% /run
# tmpfs 16G 0 16G 0% /sys/fs/cgroup
# /dev/mapper/VolGroup00-rootVol 48G 1.9G 44G 5% /
# tmpfs 16G 8.0K 16G 1% /tmp
# /dev/nvme0n1p1 453M 149M 277M 35% /boot
# /dev/mapper/VolGroup00-varVol 25G 74M 24G 1% /var
# /dev/mapper/VolGroup00-homeVol 4.9G 4.1M 4.7G 1% /home
# /dev/mapper/VolGroup00-logVol 4.9G 17M 4.7G 1% /var/log
# /dev/mapper/VolGroup00-auditVol 9.8G 37M 9.2G 1% /var/log/audit
# tmpfs 3.1G 0 3.1G 0% /run/user/1000
sudo mkdir /root/scripts
# Assumes you are using a NITRO-base EC2 instance (i.e. C5/C5d/C5n, M5/M5d/M5n/M5dn, R5/R5d/R5n/R5dn, T3, and P3dn )
# NITRO Instances use /dev/nvme#n# for disk volumes
( echo -e "d\n2\nn\np\n\n\n\nw\n" | fdisk /dev/nvme0n1 ) 1>&2
# Set the partition as LVM
( echo -e "t\n2\n8e\nw\n" | fdisk /dev/nvme0n1 ) 1>&2
sync
partprobe
pvresize /dev/sda12
sync
partprobe
# 10GB /var/log/audit
lvextend -L10G /dev/mapper/VolGroup00-auditVol
resize2fs /dev/mapper/VolGroup00-auditVol
# 5GB /var/log
lvextend -L5G /dev/mapper/VolGroup00-logVol
resize2fs /dev/mapper/VolGroup00-logVol
# 25GB /var
lvextend -L25G /dev/mapper/VolGroup00-varVol
resize2fs /dev/mapper/VolGroup00-varVol
# 5GB /home
lvextend -L5G /dev/mapper/VolGroup00-homeVol
resize2fs /dev/mapper/VolGroup00-homeVol
# 100% of what is left add to /
lvextend -l 100%FREE /dev/mapper/VolGroup00-rootVol
resize2fs /dev/mapper/VolGroup00-rootVol
EOF
#
sudo chmod 700 /root/scripts/partdrive.sh
sudo /root/scripts/partdrive.sh
#
#
reboot now
#
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