This document is for a development version of Ceph.
Cephadm deploys radosgw as a collection of daemons that manage a single-cluster deployment or a particular realm and zone in a multisite deployment. (For more information about realms and zones, see Multi-Site.)
Note that with cephadm, radosgw daemons are configured via the monitor
configuration database instead of via a ceph.conf or the command line. If
that configuration isn’t already in place (usually in the
client.rgw.<something> section), then the radosgw
daemons will start up with default settings (e.g., binding to port
To deploy a set of radosgw daemons, with an arbitrary service name name, run the following command:
ceph orch apply rgw *<name>* [--realm=*<realm-name>*] [--zone=*<zone-name>*] --placement="*<num-daemons>* [*<host1>* ...]"
For example, to deploy 2 RGW daemons (the default) for a single-cluster RGW deployment under the arbitrary service id foo:
ceph orch apply rgw foo
A common scenario is to have a labeled set of hosts that will act as gateways, with multiple instances of radosgw running on consecutive ports 8000 and 8001:
ceph orch host label add gwhost1 rgw # the 'rgw' label can be anything ceph orch host label add gwhost2 rgw ceph orch apply rgw foo '--placement=label:rgw count-per-host:2' --port=8000
To deploy RGWs serving the multisite myorg realm and the us-east-1 zone on myhost1 and myhost2:
ceph orch apply rgw east --realm=myorg --zone=us-east-1 --placement="2 myhost1 myhost2"
Note that in a multisite situation, cephadm only deploys the daemons. It does not create or update the realm or zone configurations. To create a new realm and zone, you need to do something like:
radosgw-admin realm create --rgw-realm=<realm-name> --default
radosgw-admin zonegroup create --rgw-zonegroup=<zonegroup-name> --master --default
radosgw-admin zone create --rgw-zonegroup=<zonegroup-name> --rgw-zone=<zone-name> --master --default
radosgw-admin period update --rgw-realm=<realm-name> --commit
High availability service for RGW¶
The ingress service allows you to create a high availability endpoint for RGW with a minumum set of configuration options. The orchestrator will deploy and manage a combination of haproxy and keepalived to provide load balancing on a floating virtual IP.
If SSL is used, then SSL must be configured and terminated by the ingress service and not RGW itself.
There are N hosts where the ingress service is deployed. Each host has a haproxy daemon and a keepalived daemon. A virtual IP is automatically configured on only one of these hosts at a time.
Each keepalived daemon checks every few seconds whether the haproxy daemon on the same host is responding. Keepalived will also check that the master keepalived daemon is running without problems. If the “master” keepalived daemon or the active haproxy is not responding, one of the remaining keepalived daemons running in backup mode will be elected as master, and the virtual IP will be moved to that node.
The active haproxy acts like a load balancer, distributing all RGW requests between all the RGW daemons available.
An existing RGW service, without SSL. (If you want SSL service, the certificate should be configured on the ingress service, not the RGW service.)
Deploy of the high availability service for RGW
Use the command:
ceph orch apply -i <ingress_spec_file>
Service specification file:
It is a yaml format file with the following properties:
service_type: ingress service_id: rgw.something # adjust to match your existing RGW service placement: hosts: - host1 - host2 - host3 spec: backend_service: rgw.something # adjust to match your existing RGW service virtual_ip: <string>/<string> # ex: 192.168.20.1/24 frontend_port: <integer> # ex: 8080 monitor_port: <integer> # ex: 1967, used by haproxy for load balancer status virtual_interface_networks: [ ... ] # optional: list of CIDR networks ssl_cert: | # optional: SSL certificate and key -----BEGIN CERTIFICATE----- ... -----END CERTIFICATE----- -----BEGIN PRIVATE KEY----- ... -----END PRIVATE KEY-----
where the properties of this service specification are:
Mandatory and set to “ingress”
The name of the service. We suggest naming this after the service you are controlling ingress for (e.g.,
The hosts where it is desired to run the HA daemons. An haproxy and a keepalived container will be deployed on these hosts. These hosts do not need to match the nodes where RGW is deployed.
The virtual IP (and network) in CIDR format where the ingress service will be available.
A list of networks to identify which ethernet interface to use for the virtual IP.
The port used to access the ingress service.
SSL certificate, if SSL is to be enabled. This must contain the both the certificate and private key blocks in .pem format.
Selecting ethernet interfaces for the virtual IP:
You cannot simply provide the name of the network interface on which to configure the virtual IP because interface names tend to vary across hosts (and/or reboots). Instead, cephadm will select interfaces based on other existing IP addresses that are already configured.
Normally, the virtual IP will be configured on the first network interface that has an existing IP in the same subnet. For example, if the virtual IP is 192.168.0.80/24 and eth2 has the static IP 192.168.0.40/24, cephadm will use eth2.
In some cases, the virtual IP may not belong to the same subnet as an existing static IP. In such cases, you can provide a list of subnets to match against existing IPs, and cephadm will put the virtual IP on the first network interface to match. For example, if the virtual IP is 192.168.0.80/24 and we want it on the same interface as the machine’s static IP in 10.10.0.0/16, you can use a spec like:
service_type: ingress service_id: rgw.something spec: virtual_ip: 192.168.0.80/24 virtual_interface_networks: - 10.10.0.0/16 ...
A consequence of this strategy is that you cannot currently configure the virtual IP on an interface that has no existing IP address. In this situation, we suggest configuring a “dummy” IP address is an unroutable network on the correct interface and reference that dummy network in the networks list (see above).
Useful hints for ingress:
Good to have at least 3 RGW daemons
Use at least 3 hosts for the ingress