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Expand root to all available volume space when it's a partition

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Jake Buchholz 2020-11-14 18:12:21 -08:00 committed by Mike Crute
parent 7838c22ea6
commit c1d9d27785
3 changed files with 20 additions and 6 deletions
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2
LICENSE.txt
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@ -1,4 +1,4 @@
Copyright (c) 2017 Michael Crute Copyright (c) 2017-2020 Michael Crute
Permission is hereby granted, free of charge, to any person obtaining a copy of Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in this software and associated documentation files (the "Software"), to deal in

9
README.md
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@ -9,11 +9,14 @@ and cloud platform support for small size and limited external dependencies.
## Requirements ## Requirements
The most important feature of this bootstrapper is the very limited set of The most important feature of this bootstrapper is the very limited set of
dependencies. In-fact, this works with just busybox -- provided the wget applet dependencies. In-fact, this works with just BusyBox (provided ash and wget
is built-in -- and resize2fs. The only required dependencies are: are built in) and a couple utilities for expanding the root filesystem.
The full list of required dependencies are:
- bash-like shell (e.g. bash, dash, ash) - bash-like shell (e.g. bash, dash, ash)
- wget - wget
- sfdisk
- partx
- resize2fs - resize2fs
## Supported Features and Environments ## Supported Features and Environments
@ -33,7 +36,7 @@ those things. Instead it supports:
- installing the instance's SSH keys in the EC2 user's authorized_keys file - installing the instance's SSH keys in the EC2 user's authorized_keys file
- running any script-like user data (must start with #!) - running any script-like user data (must start with #!)
- disabling root and the EC2 user's password - disabling root and the EC2 user's password
- resizing root partition to available disk space - expanding root partition to available disk space
These steps only run once. After the initial bootstrap the bootstrapper script These steps only run once. After the initial bootstrap the bootstrapper script
is a no-op. To force the script to run again at boot time remove the file is a no-op. To force the script to run again at boot time remove the file

15
tiny-ec2-bootstrap
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@ -66,11 +66,22 @@ _run_userdata() {
ec=$(cat "$ec_file") ec=$(cat "$ec_file")
echo "User Data Script Exit Status: $ec" echo "User Data Script Exit Status: $ec"
return $ec return "$ec"
fi fi
} }
_resize_root_partition() { _resize_root_partition() {
local mountpoint="$(mountpoint -n / | cut -d' ' -f1)"
# mountpoint is the second partition...
if echo "$mountpoint" | cut -d' ' -f1 | grep -qE '/(nvme\d+n\d+p|xvd[a-z]+)2$'; then
local volume="$(echo "$mountpoint" | sed -Ee 's/(nvme\d+n\d+|xvd[a-z]+)p?2/\1/')"
einfo "Expanding root partition to volume size..."
echo ", +" | sfdisk -q --no-reread -N 2 "$volume"
einfo "Updating kernel with new partition table..."
partx -u "$volume"
fi
einfo "Resizing..."
resize2fs "$(mountpoint -n / | cut -d' ' -f1)" resize2fs "$(mountpoint -n / | cut -d' ' -f1)"
} }
@ -86,7 +97,7 @@ start() {
ebegin "Disabling root password"; _disable_password root; eend $? ebegin "Disabling root password"; _disable_password root; eend $?
ebegin "Disabling $EC2_USER password"; _disable_password "$EC2_USER"; eend $? ebegin "Disabling $EC2_USER password"; _disable_password "$EC2_USER"; eend $?
ebegin "Resizing root partition"; _resize_root_partition; eend $? ebegin "Expanding root partition"; _resize_root_partition; eend $?
ebegin "Setting ec2 hostname"; _update_hostname; eend $? ebegin "Setting ec2 hostname"; _update_hostname; eend $?
ebegin "Setting ec2 user ssh keys"; _set_ssh_keys "$EC2_USER"; eend $? ebegin "Setting ec2 user ssh keys"; _set_ssh_keys "$EC2_USER"; eend $?
ebegin "Running ec2 user data script"; _run_userdata; eend $? ebegin "Running ec2 user data script"; _run_userdata; eend $?