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CentOS-7 Systemd Unit File to Grow the Root LVM Disk on AWS EC2 Instances with an ext4 File System.
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# To install: | |
# sudo cat grow-root.service > /etc/systemd/system/grow-root.service | |
# sudo systemctl daemon-reload | |
# sudo systemctl enable -f grow-root.service | |
# | |
# Start (auto disables after first successful expansion): | |
# sudo systemctl start grow-root.service | |
# | |
# Debugging: | |
# sudo systemctl status grow-root.service | |
# journalctl -fn 50 -u grow-root.service | |
# | |
# To uninstall: | |
# sudo systemctl disable -f grow-root.service | |
[Unit] | |
DefaultDependencies=no | |
Description=Grow root file system | |
Requires=local-fs.target | |
After=local-fs.target | |
[Service] | |
Type=oneshot | |
Environment="BIN_FS_RESIZER=/sbin/resize2fs" | |
Environment="DISK_DEVICE=/dev/xvda" | |
Environment="LVM_LV_ROOT=lv_root" | |
Environment="LVM_VG_ROOT=vg_root" | |
Environment="PARTITION_NUMBER=3" | |
Environment="PARTITION_TYPE=p" | |
Environment="PARTITION_TYPE_CODE=8e" | |
ExecStart=-/bin/bash -c \ | |
"if (( $(/bin/lsblk -lp --output NAME,SIZE | /bin/grep \"^${DISK_DEVICE} \" | /usr/bin/grep -o ' [0-9]*' || printf -- '0') > $(( $(/bin/lsblk -lp --output NAME,SIZE | /bin/grep \"^${DISK_DEVICE}1\" | /usr/bin/grep -o ' [0-9]*' || printf -- '0') + $(/bin/lsblk -lp --output NAME,SIZE | /bin/grep -m 1 \"^/dev/mapper/${LVM_VG_ROOT}-${LVM_LV_ROOT}\" | /usr/bin/grep -o ' [0-9]*' || printf -- '0') )) )); then \ | |
printf -- 'Space free on root volume\\n'; \ | |
if ! /bin/lsblk -lp --output NAME,SIZE | /bin/grep -q \"^${DISK_DEVICE}${PARTITION_NUMBER}\"; then \ | |
printf -- 'Growing root volume...\\n'; \ | |
printf -- 'n\\n%%s\\n%%s\\n\\n\\nt\\n%%s\\n%%s\\nw\\n' \ | |
\"${PARTITION_TYPE}\" \ | |
\"${PARTITION_NUMBER}\" \ | |
\"${PARTITION_NUMBER}\" \ | |
\"${PARTITION_TYPE_CODE}\" \ | |
| /sbin/fdisk ${DISK_DEVICE}; \ | |
/sbin/partprobe -s; \ | |
/sbin/pvcreate ${DISK_DEVICE}${PARTITION_NUMBER}; \ | |
/sbin/vgextend ${LVM_VG_ROOT} ${DISK_DEVICE}${PARTITION_NUMBER}; \ | |
/sbin/lvextend /dev/${LVM_VG_ROOT}/${LVM_LV_ROOT} ${DISK_DEVICE}${PARTITION_NUMBER}; \ | |
${BIN_FS_RESIZER} /dev/${LVM_VG_ROOT}/${LVM_LV_ROOT}; \ | |
/bin/systemctl disable -f grow-root.service; \ | |
fi; \ | |
fi" | |
[Install] | |
WantedBy=local-fs.target |
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