RGW Service

Deploy RGWs

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 80).

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>* ...]"

Trivial setup

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

Designated gateways

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

Specifying Networks

The RGW service can have the network they bind to configured with a yaml service specification.

example spec file:

service_type: rgw
service_id: foo
placement:
  label: rgw
  count_per_host: 2
networks:
- 192.169.142.0/24
spec:
  rgw_frontend_port: 8080

Multisite zones

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 --zonegroup=us-east-zg-1 --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 realms, zones and zonegroups you can use RGW Module or manually using something like:

radosgw-admin realm create --rgw-realm=<realm-name>

radosgw-admin zonegroup create --rgw-zonegroup=<zonegroup-name>  --master

radosgw-admin zone create --rgw-zonegroup=<zonegroup-name> --rgw-zone=<zone-name> --master

radosgw-admin period update --rgw-realm=<realm-name> --commit

See Daemon Placement for details of the placement specification. See Multi-Site for more information of setting up multisite RGW.

Setting up HTTPS

In order to enable HTTPS for RGW services, apply a spec file following this scheme:

service_type: rgw
service_id: myrgw
spec:
  rgw_frontend_ssl_certificate: |
    -----BEGIN PRIVATE KEY-----
    V2VyIGRhcyBsaWVzdCBpc3QgZG9vZi4gTG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFt
    ZXQsIGNvbnNldGV0dXIgc2FkaXBzY2luZyBlbGl0ciwgc2VkIGRpYW0gbm9udW15
    IGVpcm1vZCB0ZW1wb3IgaW52aWR1bnQgdXQgbGFib3JlIGV0IGRvbG9yZSBtYWdu
    YSBhbGlxdXlhbSBlcmF0LCBzZWQgZGlhbSB2b2x1cHR1YS4gQXQgdmVybyBlb3Mg
    ZXQgYWNjdXNhbSBldCBqdXN0byBkdW8=
    -----END PRIVATE KEY-----
    -----BEGIN CERTIFICATE-----
    V2VyIGRhcyBsaWVzdCBpc3QgZG9vZi4gTG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFt
    ZXQsIGNvbnNldGV0dXIgc2FkaXBzY2luZyBlbGl0ciwgc2VkIGRpYW0gbm9udW15
    IGVpcm1vZCB0ZW1wb3IgaW52aWR1bnQgdXQgbGFib3JlIGV0IGRvbG9yZSBtYWdu
    YSBhbGlxdXlhbSBlcmF0LCBzZWQgZGlhbSB2b2x1cHR1YS4gQXQgdmVybyBlb3Mg
    ZXQgYWNjdXNhbSBldCBqdXN0byBkdW8=
    -----END CERTIFICATE-----
  ssl: true

Then apply this yaml document:

ceph orch apply -i myrgw.yaml

Note the value of rgw_frontend_ssl_certificate is a literal string as indicated by a | character preserving newline characters.

Service specification

class ceph.deployment.service_spec.RGWSpec(service_type='rgw', service_id=None, placement=None, rgw_realm=None, rgw_zonegroup=None, rgw_zone=None, rgw_frontend_port=None, rgw_frontend_ssl_certificate=None, rgw_frontend_type=None, unmanaged=False, ssl=False, preview_only=False, config=None, networks=None, subcluster=None, extra_container_args=None, extra_entrypoint_args=None, custom_configs=None, rgw_realm_token=None, update_endpoints=False, zone_endpoints=None)

Settings to configure a (multisite) Ceph RGW

service_type: rgw
service_id: myrealm.myzone
spec:
    rgw_realm: myrealm
    rgw_zonegroup: myzonegroup
    rgw_zone: myzone
    ssl: true
    rgw_frontend_port: 1234
    rgw_frontend_type: beast
    rgw_frontend_ssl_certificate: ...

High availability service for RGW

The ingress service allows you to create a high availability endpoint for RGW with a minimum 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 the RGW service is configured with SSL enabled, then the ingress service will use the ssl and verify none options in the backend configuration. Trust verification is disabled because the backends are accessed by IP address instead of FQDN.

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.

Prerequisites

An existing RGW service.

Deploying

Use the command:

ceph orch apply -i <ingress_spec_file>

Service specification

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
  use_keepalived_multicast: <bool>          # optional: Default is False.
  vrrp_interface_network: <string>/<string> # optional: ex: 192.168.20.0/24
  ssl_cert: |                               # optional: SSL certificate and key
    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----
    -----BEGIN PRIVATE KEY-----
    ...
    -----END PRIVATE KEY-----

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_ips_list:
  - <string>/<string>                 # ex: 192.168.20.1/24
  - <string>/<string>                 # ex: 192.168.20.2/24
  - <string>/<string>                 # ex: 192.168.20.3/24
  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
  first_virtual_router_id: <integer>  # optional: default 50
  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:

service_type
Mandatory and set to “ingress”
service_id
The name of the service. We suggest naming this after the service you are controlling ingress for (e.g., rgw.foo).
placement hosts
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.
virtual_ip
The virtual IP (and network) in CIDR format where the ingress service will be available.
virtual_ips_list
The virtual IP address in CIDR format where the ingress service will be available. Each virtual IP address will be primary on one node running the ingress service. The number of virtual IP addresses must be less than or equal to the number of ingress nodes.
virtual_interface_networks
A list of networks to identify which ethernet interface to use for the virtual IP.
frontend_port
The port used to access the ingress service.
ssl_cert:
SSL certificate, if SSL is to be enabled. This must contain the both the certificate and private key blocks in .pem format.
use_keepalived_multicast
Default is False. By default, cephadm will deploy keepalived config to use unicast IPs, using the IPs of the hosts. The IPs chosen will be the same IPs cephadm uses to connect to the machines. But if multicast is prefered, we can set use_keepalived_multicast to True and Keepalived will use multicast IP (224.0.0.18) to communicate between instances, using the same interfaces as where the VIPs are.
vrrp_interface_network
By default, cephadm will configure keepalived to use the same interface where the VIPs are for VRRP communication. If another interface is needed, it can be set via vrrp_interface_network with a network to identify which ethernet interface to use.
first_virtual_router_id
Default is 50. When deploying more than 1 ingress, this parameter can be used to ensure each keepalived will have different virtual_router_id. In the case of using virtual_ips_list, each IP will create its own virtual router. So the first one will have first_virtual_router_id, second one will have first_virtual_router_id + 1, etc. Valid values go from 1 to 255.

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

It is good to have at least 3 RGW daemons.
We recommend at least 3 hosts for the ingress service.

RGW Service

Deploy RGWs

Trivial setup

Designated gateways

Specifying Networks

Multisite zones

Setting up HTTPS

Service specification

High availability service for RGW

Prerequisites

Deploying

Service specification

Selecting ethernet interfaces for the virtual IP

Useful hints for ingress

Further Reading