Mirror Servers

Each cloud region hosts a dedicated mirror server which serves static content from OpenAFS.

At a Glance

Hosts:

• http://mirror.region.cloud.opendev.org

Projects:

• http://apache.org/

Configuration:

• system-config: launch/src/opendev_launch/mirror_volumes.sh

Overview

When setting up a new mirror, add a cinder volume and run the system-config: launch/src/opendev_launch/mirror_volumes.sh to set up LVM volumes. The cinder volume should be at least 200GB as we divide the volume with 50% capacity assigned to Apache2 caches and 50% assigned to OpenAFS caches. Starting with 200GB gives us at least 100GB for each of the caches we run.

With the volume attached to the server determine the device path then run this command:

./mirror_volumes.sh -d /dev/$DEVICE -g main \
  -v afscache:50%VG:/var/cache/openafs \
  -v proxycache:50%VG:/var/cache/apache2

This will configure the cinder volume with one lvm volume group for OpenAFS and another for Apache2. Each volume will get an ext4 filesystem and /etc/fstab will be updated. After confirming the script outputs look good you will need to systemctl daemon-reload then mount -a to mount the new filesystems. A reboot is also a good idea to confirm everything comes up on a fresh boot too.