Configuring a public network

Edit online

While Ceph functions well with only a public network, you can establish more specific criteria, including multiple IP networks, for your public network.

To configure Ceph networks, use the config set command within the cephadm shell. Note that the IP addresses you set in your network configuration are different from the public-facing IP addresses that network clients might use to access your service.

Ceph functions perfectly well with only a public network. However, Ceph allows you to establish much more specific criteria, including multiple IP networks for your public network.

You can also establish a separate, private cluster network to handle OSD heartbeat, object replication, and recovery traffic. For more information about the private network, see Configuring a private network.
Note:
  • Ceph uses CIDR notation for subnets, for example, 10.0.0.0/24. Typical internal IP networks are often 192.168.0.0/24 or 10.0.0.0/24.
  • If you specify more than one IP address for either the public or the cluster network, the subnets within the network must be capable of routing to each other. In addition, make sure you include each IP address in your IP tables, and open ports for them as necessary.

The public network configuration allows you specifically define IP addresses and subnets for the public network.

Prerequisites

  • Installation of the IBM Storage Ceph software.

Procedure

  1. Log in to the cephadm shell:

    Example 

    [root@host01 ~]# cephadm shell

  2. Configure the public network with the subnet:

    Syntax 

    ceph config set mon public_network IP_ADDRESS_WITH_SUBNET

    Example 

    [ceph: root@host01 /]# ceph config set mon public_network 192.168.0.0/24

  3. Get the list of services in the storage cluster:

    Example 

    [ceph: root@host01 /]# ceph orch ls

  4. Restart the daemons. Ceph daemons bind dynamically, so you do not have to restart the entire cluster at once if you change the network configuration for a specific daemon.

    Example 

    [ceph: root@host01 /]# ceph orch restart mon

  5. Optional: If you want to restart the cluster, on the admin node as a root user, run systemctl command:

    Syntax 

    systemctl restart ceph-FSID_OF_CLUSTER.target

    Example 

    [root@host01 ~]# systemctl restart ceph-1ca9f6a8-d036-11ec-8263-fa163ee967ad.target

Reference