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## gce-disk-expand package for CentOS/RHEL | ||
## gce-disk-expand package for CentOS/RHEL and Debian | ||
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This package is intended to expand the root partition up to 2TB on a GCE VM. It | ||
consists of several scripts from other packages that for various reasons are not | ||
maintained by the distros; cloud-utils-growpart, dracut-modules-growroot, and an | ||
upstream version of the growpart script. See below for details. This package is | ||
included in GCE CentOS and RHEL images after v20160415. | ||
This package is intended to expand the root partition up to 2TB on a GCE VM | ||
without a GPT partition table and over 2TB on GPT partitioned UEFI enabled | ||
images. | ||
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### Build the package | ||
This package has been tested on the following distros and versions. | ||
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A script to build the package is provided for convenience. | ||
`./build_package.sh /OUTPUT_DIR` will yield an rpm and an srpm in the | ||
defined output directory for EL6 and EL7. | ||
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### Package usage | ||
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Install the gce-disk-expand package for your distro with yum and reboot: | ||
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* CentOS/RHEL 6: `yum -y install /PATH_TO/gce-disk-expand-el6-VER-DATE.x86_64.rpm ; reboot` | ||
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* CentOS/RHEL 7: `yum -y install /PATH_TO/gce-disk-expand-el7-VER-DATE.x86_64.rpm ; reboot` | ||
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Your root partition will now be expanded to the full size of your disk up to | ||
2TB. | ||
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#### Growpart | ||
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The growpart script used in this package is not from the 0.27 | ||
cloud-utils-growpart package. There are bugs in that version of growpart, | ||
primarily a bug that doesn't respect 2TB disk partitions on MBR disks. This | ||
means that if you had a disk that was 2.1TB, you would end up with a 0.1TB | ||
partition instead of 2TB partition. Obviously, this is bad. The upstream | ||
[cloud-utils 257 release](http://bazaar.launchpad.net/~cloud-utils-dev/cloud-utils/trunk/tarball/257) | ||
fixes this bug and others while not introducing more bugs and dependencies in | ||
further upstream releases of this script. It is therefore not recommended that | ||
you try to use the [0.27 growpart package](http://rpmfind.net/linux/RPM/epel/6/x86_64/cloud-utils-growpart-0.27-10.el6.x86_64.html) | ||
from the EPEL repo. | ||
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#### Dracut module for EL6 | ||
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The dracut module is taken from the [dracut-modules-growroot](http://rpmfind.net/linux/RPM/epel/6/x86_64/dracut-modules-growroot-0.20-2.el6.noarch.html) | ||
package in the EPEL 6 repo. The dracut module allows the partition table to be | ||
expanded on boot before / is mounted and prevents an additional reboot in CentOS | ||
and RHEL 6. CentOS and RHEL 7 support live partition resizing by the kernel and | ||
do not need the dracut module. | ||
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#### The expand-root script | ||
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The expand-root script is derived from the | ||
[bootstrap-vz version](https://github.com/andsens/bootstrap-vz/blob/c682dab6ec51767b6e529c1589c5630f6295953a/bootstrapvz/common/assets/init.d/expand-root) | ||
of this script used for Debian instances. Essentially, it just calls the proper | ||
filesystem expansion utility to live resize the filesystem on first boot. The | ||
root partition is hard coded as /dev/sda1 in this script. | ||
* RHEL/CentOS 7.4+ | ||
* RHEL 8+ | ||
* Debian 10+ |
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src/usr/share/initramfs-tools usr/share/ | ||
src/expandfs-lib.sh usr/share/initramfs-tools/scripts/ |
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