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ceph-iscsi

This project provides the common logic and CLI tools for creating and managing LIO gateways for Ceph.

It includes the rbd-target-api daemon which is responsible for restoring the state of LIO following a gateway reboot/outage and exporting a REST API to configure the system using tools like gwcli. It replaces the existing 'target' service.

There is also a second daemon rbd-target-gw which exports a REST API to gather statistics.

It also includes the CLI tool gwcli which can be used to configure and manage the Ceph iSCSI gateway, which replaces the existing targetcli CLI tool. This CLI tool utilizes the rbd-target-api server daemon to configure multiple gateways concurrently.

Usage

This package should be installed on each node that is intended to be an iSCSI gateway. The Python ceph_iscsi_config modules are used by:

  • the rbd-target-api daemon to restore LIO state at boot time
  • API/CLI configuration tools

Installation

Via RPM

Simply install the provided rpm with: rpm -ivh ceph-iscsi-<ver>.el7.noarch.rpm

Manually

The following packages are required by ceph-iscsi-config and must be installed before starting the rbd-target-api and rbd-target-gw services:

python-rados python-rbd python-netifaces python-rtslib python-configshell python-cryptography python-flask

To install the python package that provides the CLI tool, daemons and application logic, run the provided setup.py script i.e. > python setup.py install

If using systemd, copy the following unit files into their equivalent places on each gateway:

  • <archive_root>/usr/lib/systemd/system/rbd-target-gw.service --> /lib/systemd/system
  • <archive_root>/usr/lib/systemd/system/rbd-target-api.service --> /lib/systemd/system

Once the unit files are in place, reload the configuration with

systemctl daemon-reload
systemctl enable rbd-target-api
systemctl enable rbd-target-gw
systemctl start rbd-target-api
systemctl start rbd-target-gw

Features

The functionality provided by each module in the python package is summarised below;

Module Description
client logic handling the create/update and remove of a NodeACL from a gateway
config common code handling the creation and update mechanisms for the rados configuration object
gateway definition of the iSCSI gateway (target plus target portal groups)
lun rbd image management (create/resize), combined with mapping to the OS and LIO instance
utils common code called by multiple modules

The rbd-target-api daemon performs the following tasks;

  1. At start up remove any osd blacklist entry that may apply to the running host
  2. Read the configuration object from Rados
  3. Process the configuration
    3.1 map rbd's to the host
    3.2 add rbd's to LIO
    3.3 Create the iscsi target, TPG's and port IP's
    3.4 Define clients (NodeACL's)
    3.5 add the required rbd images to clients
  4. Export a REST API for system configuration.