Storage prerequisites
Before installing the snapshot agent on the machines, make sure you either have an extra empty disk attached to the machine or have an empty iSCSI target connected, having at least the same size as the disks of the machine itself.
Coriolis Snapshot Agent requires an extra disk device attached to the server, where it can store the created snapshots. The extra disk device can be either a physical disk, a removable disk, or an iSCSI attached disk. The size of this extra disk should be at least the same as the total storage capacity of the server.
Before starting to install the Snapshot Agent, the extra disk must be formatted and mounted.
The minimum size of the extra disk must be at least the size of the largest disk available on the Bare Metal Server.
The file system for the snapstore disk must support a Linux-specific system call named fallocate (zero range), which is available on the following file systems:
- ext4
- xfs
- btrfs
Snapstore destination is an array of paths on the disk where the snap store watchers will allocate disk space for the snap stores. The device on which these folders reside will be excluded from the list of
snapshot-able disks. If this path is on a device mapper, all disks that make up that device mapper, will be excluded. Paths set here should be on a separate block volume (physical, iSCSI, rbd, etc).
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snapstore_destinations = "/mnt/snapstores/snapstore_files" |
Adding, formatting, and mounting the extra disk
- list the current disks after adding the extra disk and start its partitioning
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ls /dev/sd* fdisk /dev/sdx |
- run through the partitioning tool steps
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list partitions = p create new partition = n set the partition number = 1 (default) write to disk = w |
- format the newly created partition
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sudo mkfs.ext4 /dev/sdx1 |
- mount the previously formatted partition
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mount /dev/sdx1 /mnt/snapstores/snapstore_files |
Once the disk is formatted and mounted Coriolis will automatically add the new mount to fstab, while running the Agent install script.
Network prerequisites
The network requirement will be for the machine to have port 80 and port 9999 (if the default port for the server is used during the Snapshot Agent installation process) opened.
Coriolis will use port 80 for connecting and generating Certificates for the Bare Metal Server using its built-in CA which will perform an HTTP challenge.
This is required to be open only during the Agent installation, or any other time when the Agent is reinstalled or upgraded.
Port 9999 will be used for the Coriolis Appliance to connect and communicate with the server.