Chapter 1. RESTful Plug-in
1.1. What is the RESTful Plug-in?
The RESTful plug-in for the Ceph Manager (ceph-mgr) provides an API for interacting with a Red Hat Ceph Storage cluster.
You can use the API to:
- Show the information about Monitors and OSDs
- Create or edit pools
- View and start scheduled processes on OSDs
- Show configuration options for the cluster, Monitor, and OSDs
1.2. Enabling and Securing the RESTful plug-in
The RESTful plug-in offers the REST API access to the status of the cluster over an SSL-secured connection. This section describes how to enable the plug-in and secure it.
Prerequisites
-
Ensure that you have at least one
ceph-mgrdaemon active. See the Installing a Red Hat Ceph Storage section in the Red Hat Ceph Storage 4 Installation Guide. -
If you use a firewall, ensure that the
8003port is enabled on the node with the activeceph-mgrdaemon.
Procedure
Use the following commands on a node with the administration keyring.
Enable the RESTful plug-in.
[root@admin ~]# ceph mgr module enable restful
Configure an SSL certificate.
If your organization’s certificate authority provides a certificate, set the certificate:
ceph config-key set mgr/restful/hostname/crt -i certificate ceph config-key set mgr/restful/hostname/key -i key
Replace hostname with the host name of the host where the active
ceph-mgrinstance is running, certificate with the path to the certificate file, and key with the path to the key file, for example:[root@admin ~]# ceph config-key set mgr/restful/node1/crt -i restful.crt [root@admin ~]# ceph config-key set mgr/restful/node1/key -i restful.key
If you want to use the certificate on all
ceph-mgrinstances, omit the hostname part, for example:[root@admin ~]# ceph config-key set mgr/restful/crt -i restful.crt [root@admin ~]# ceph config-key set mgr/restful/key -i restful.key
Alternatively, generate a self-signed certificate. However, using a self-signed certificate does not provide full security benefits of the HTTPS protocol.
[root@admin ~]# ceph restful create-self-signed-cert
Create an HTTP user and generate a password for HTTP basic authentication.
ceph restful create-key usernameReplace username with name of the user. For example, to create a user named
admin:[root@admin ~]# ceph restful create-key admin 3ce361b7-97fb-4820-8edc-1090841f078e
Connect to the RESTful plug-in web page. Open a web browser and enter the following URL:
https://_ceph-mgr_:8003
Replace ceph-mgr with the IP address or host name of the node with the active
ceph-mgrdaemon:https://node1:8003
If you used a self-signed certificate, confirm a security exception.
- Optional. If you want to use a static IP address for the RESTful plug-in, configure a load balancer.
Additional Resources
-
The
ceph restful --helpcommand -
The
https://ceph-mgr:8003/docpage, where ceph-mgr is the IP address or host name of the node with the runningceph-mgrinstance - The Using OpenSSL chapter in the Security Guide for Red Hat Enterprise Linux 7
