Configuring the service

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Configuring the service

Procedure 5.2. Updating the Object Storage configuration ``swift.yml`` file

  1. Copy the /etc/openstack_deploy/conf.d/swift.yml.example file to /etc/openstack_deploy/conf.d/swift.yml:

    # cp /etc/openstack_deploy/conf.d/swift.yml.example \
        /etc/openstack_deploy/conf.d/swift.yml
    
  2. Update the global override values:

    # global_overrides:
    #   swift:
    #     part_power: 8
    #     weight: 100
    #     min_part_hours: 1
    #     repl_number: 3
    #     storage_network: 'br-storage'
    #     replication_network: 'br-repl'
    #     drives:
    #       - name: sdc
    #       - name: sdd
    #       - name: sde
    #       - name: sdf
    #     mount_point: /srv/node
    #     account:
    #     container:
    #     storage_policies:
    #       - policy:
    #           name: gold
    #           index: 0
    #           default: True
    #       - policy:
    #           name: silver
    #           index: 1
    #           repl_number: 3
    #           deprecated: True
    #     statsd_host: statsd.example.com
    #     statsd_port: 8125
    #     statsd_metric_prefix:
    #     statsd_default_sample_rate: 1.0
    #     statsd_sample_rate_factor: 1.0
    
    part_power

    Set the partition power value based on the total amount of storage the entire ring uses.

    Multiply the maximum number of drives ever used with the swift installation by 100 and round that value up to the closest power of two value. For example, a maximum of six drives, times 100, equals 600. The nearest power of two above 600 is two to the power of nine, so the partition power is nine. The partition power cannot be changed after the swift rings are built.

    weight

    The default weight is 100. If the drives are different sizes, set the weight value to avoid uneven distribution of data. For example, a 1 TB disk would have a weight of 100, while a 2 TB drive would have a weight of 200.

    min_part_hours

    The default value is 1. Set the minimum partition hours to the amount of time to lock a partition’s replicas after moving a partition. Moving multiple replicas at the same time makes data inaccessible. This value can be set separately in the swift, container, account, and policy sections with the value in lower sections superseding the value in the swift section.

    repl_number

    The default value is 3. Set the replication number to the number of replicas of each object. This value can be set separately in the swift, container, account, and policy sections with the value in the more granular sections superseding the value in the swift section.

    storage_network

    By default, the swift services listen on the default management IP. Optionally, specify the interface of the storage network.

    If the storage_network is not set, but the storage_ips per host are set (or the storage_ip is not on the storage_network interface) the proxy server is unable to connect to the storage services.

    replication_network

    Optionally, specify a dedicated replication network interface, so dedicated replication can be setup. If this value is not specified, no dedicated replication_network is set.

    Replication does not work properly if the repl_ip is not able to connect to other hosts repl_ip.

    drives

    Set the default drives per host. This is useful when all hosts have the same drives. These can be overridden on a per host basis.

    mount_point

    Set the mount_point value to the location where the swift drives are mounted. For example, with a mount point of /srv/node and a drive of sdc, a drive is mounted at /srv/node/sdc on the swift_host. This can be overridden on a per-host basis.

    storage_policies

    Storage policies determine on which hardware data is stored, how the data is stored across that hardware, and in which region the data resides. Each storage policy must have a unique name and a unique index. There must be a storage policy with an index of 0 in the swift.yml file to use any legacy containers created before storage policies were instituted.

    default

    Set the default value to yes for at least one policy. This is the default storage policy for any non-legacy containers that are created.

    deprecated

    Set the deprecated value to yes to turn off storage policies.

    For account and container rings, min_part_hours and repl_number are the only values that can be set. Setting them in this section overrides the defaults for the specific ring.

    statsd_host

    Swift supports sending extra metrics to a statsd host. This option sets the statsd host to receive statsd metrics. Specifying this here applies to all hosts in the cluster.

    If statsd_host is left blank or omitted, then statsd are disabled.

    All statsd settings can be overridden or you can specify deeper in the structure if you want to only catch statsdv metrics on certain hosts.

    statsd_port

    Optionally, use this to specify the statsd server’s port you are sending metrics to. Defaults to 8125 of omitted.

    statsd_default_sample_rate and statsd_sample_rate_factor

    These statsd related options are more complex and are used to tune how many samples are sent to statsd. Omit them unless you need to tweak these settings, if so first read: https://docs.openstack.org/swift/latest/admin_guide.html

  3. Update the swift proxy hosts values:

    # swift-proxy_hosts:
    #   infra-node1:
    #     ip: 192.0.2.1
    #     statsd_metric_prefix: proxy01
    #   infra-node2:
    #     ip: 192.0.2.2
    #     statsd_metric_prefix: proxy02
    #   infra-node3:
    #     ip: 192.0.2.3
    #     statsd_metric_prefix: proxy03
    
    swift-proxy_hosts

    Set the IP address of the hosts so Ansible connects to to deploy the swift-proxy containers. The swift-proxy_hosts value matches the infra nodes.

statsd_metric_prefix

This metric is optional, and also only evaluated it you have defined statsd_host somewhere. It allows you define a prefix to add to all statsd metrics sent from this hose. If omitted, use the node name.

  1. Update the swift hosts values:

    # swift_hosts:
    #   swift-node1:
    #     ip: 192.0.2.4
    #     container_vars:
    #       swift_vars:
    #         zone: 0
    #         statsd_metric_prefix: node1
    #   swift-node2:
    #     ip: 192.0.2.5
    #     container_vars:
    #       swift_vars:
    #         zone: 1
    #         statsd_metric_prefix: node2
    #   swift-node3:
    #     ip: 192.0.2.6
    #     container_vars:
    #       swift_vars:
    #         zone: 2
    #         statsd_metric_prefix: node3
    #   swift-node4:
    #     ip: 192.0.2.7
    #     container_vars:
    #       swift_vars:
    #         zone: 3
    #   swift-node5:
    #     ip: 192.0.2.8
    #     container_vars:
    #       swift_vars:
    #         storage_ip: 198.51.100.8
    #         repl_ip: 203.0.113.8
    #         zone: 4
    #         region: 3
    #         weight: 200
    #         groups:
    #           - account
    #           - container
    #           - silver
    #         drives:
    #           - name: sdb
    #             weight: 75
    #             groups:
    #               - gold
    #           - name: sdc
    #           - name: sdd
    #           - name: sde
    #           - name: sdf
    
    swift_hosts

    Specify the hosts to be used as the storage nodes. The ip is the address of the host to which Ansible connects. Set the name and IP address of each swift host. The swift_hosts section is not required.

    swift_vars

    Contains the swift host specific values.

    storage_ip and repl_ip

    Base these values on the IP addresses of the host’s storage_network or replication_network. For example, if the storage_network is br-storage and host1 has an IP address of 1.1.1.1 on br-storage, then this is the IP address in use for storage_ip. If only the storage_ip is specified, then the repl_ip defaults to the storage_ip. If neither are specified, both default to the host IP address.

    zone

    The default is 0. Optionally, set the swift zone for the ring.

    region

    Optionally, set the swift region for the ring.

    weight

    The default weight is 100. If the drives are different sizes, set the weight value to avoid uneven distribution of data. This value can be specified on a host or drive basis (if specified at both, the drive setting takes precedence).

    groups

    Set the groups to list the rings to which a host’s drive belongs. This can be set on a per drive basis which overrides the host setting.

    drives

    Set the names of the drives on the swift host. Specify at least one name.

statsd_metric_prefix

This metric is optional, and only evaluates if statsd_host is defined somewhere. This allows you to define a prefix to add to all statsd metrics sent from the hose. If omitted, use the node name.

In the following example, swift-node5 shows values in the swift_hosts section that override the global values. Groups are set, which overrides the global settings for drive sdb. The weight is overridden for the host and specifically adjusted for drive sdb.

#  swift-node5:
#     ip: 192.0.2.8
#     container_vars:
#       swift_vars:
#         storage_ip: 198.51.100.8
#         repl_ip: 203.0.113.8
#         zone: 4
#         region: 3
#         weight: 200
#         groups:
#           - account
#           - container
#           - silver
#         drives:
#           - name: sdb
#             weight: 75
#             groups:
#               - gold
#           - name: sdc
#           - name: sdd
#           - name: sde
#           - name: sdf
  1. Ensure the swift.yml is in the /etc/openstack_deploy/conf.d/ folder.

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