# Dedicated replication network

## Summary

Swift’s replication process is essential for consistency and availability of data. By default, replication activity will use the same network interface as other cluster operations. However, if a replication interface is set in the ring for a node, that node will send replication traffic on its designated separate replication network interface. Replication traffic includes REPLICATE requests and rsync traffic.

To separate the cluster-internal replication traffic from client traffic, separate replication servers can be used. These replication servers are based on the standard storage servers, but they listen on the replication IP and only respond to REPLICATE requests. Storage servers can serve REPLICATE requests, so an operator can transition to using a separate replication network with no cluster downtime.

Replication IP and port information is stored in the ring on a per-node basis. These parameters will be used if they are present, but they are not required. If this information does not exist or is empty for a particular node, the node’s standard IP and port will be used for replication.

## For SAIO replication

1. Create new script in `~/bin/` (for example: `remakerings_new`):

       #!/bin/bash
       set -e
       cd /etc/swift
       rm -f *.builder *.ring.gz backups/*.builder backups/*.ring.gz
       swift-ring-builder object.builder create 10 3 1
       swift-ring-builder object.builder add z1-127.0.0.1:6210R127.0.0.1:6250/sdb1 1
       swift-ring-builder object.builder add z2-127.0.0.1:6220R127.0.0.1:6260/sdb2 1
       swift-ring-builder object.builder add z3-127.0.0.1:6230R127.0.0.1:6270/sdb3 1
       swift-ring-builder object.builder add z4-127.0.0.1:6240R127.0.0.1:6280/sdb4 1
       swift-ring-builder object.builder rebalance
       swift-ring-builder object-1.builder create 10 2 1
       swift-ring-builder object-1.builder add z1-127.0.0.1:6210R127.0.0.1:6250/sdb1 1
       swift-ring-builder object-1.builder add z2-127.0.0.1:6220R127.0.0.1:6260/sdb2 1
       swift-ring-builder object-1.builder add z3-127.0.0.1:6230R127.0.0.1:6270/sdb3 1
       swift-ring-builder object-1.builder add z4-127.0.0.1:6240R127.0.0.1:6280/sdb4 1
       swift-ring-builder object-1.builder rebalance
       swift-ring-builder object-2.builder create 10 6 1
       swift-ring-builder object-2.builder add z1-127.0.0.1:6210R127.0.0.1:6250/sdb1 1
       swift-ring-builder object-2.builder add z1-127.0.0.1:6210R127.0.0.1:6250/sdb5 1
       swift-ring-builder object-2.builder add z2-127.0.0.1:6220R127.0.0.1:6260/sdb2 1
       swift-ring-builder object-2.builder add z2-127.0.0.1:6220R127.0.0.1:6260/sdb6 1
       swift-ring-builder object-2.builder add z3-127.0.0.1:6230R127.0.0.1:6270/sdb3 1
       swift-ring-builder object-2.builder add z3-127.0.0.1:6230R127.0.0.1:6270/sdb7 1
       swift-ring-builder object-2.builder add z4-127.0.0.1:6240R127.0.0.1:6280/sdb4 1
       swift-ring-builder object-2.builder add z4-127.0.0.1:6240R127.0.0.1:6280/sdb8 1
       swift-ring-builder object-2.builder rebalance
       swift-ring-builder container.builder create 10 3 1
       swift-ring-builder container.builder add z1-127.0.0.1:6211R127.0.0.1:6251/sdb1 1
       swift-ring-builder container.builder add z2-127.0.0.1:6221R127.0.0.1:6261/sdb2 1
       swift-ring-builder container.builder add z3-127.0.0.1:6231R127.0.0.1:6271/sdb3 1
       swift-ring-builder container.builder add z4-127.0.0.1:6241R127.0.0.1:6281/sdb4 1
       swift-ring-builder container.builder rebalance
       swift-ring-builder account.builder create 10 3 1
       swift-ring-builder account.builder add z1-127.0.0.1:6212R127.0.0.1:6252/sdb1 1
       swift-ring-builder account.builder add z2-127.0.0.1:6222R127.0.0.1:6262/sdb2 1
       swift-ring-builder account.builder add z3-127.0.0.1:6232R127.0.0.1:6272/sdb3 1
       swift-ring-builder account.builder add z4-127.0.0.1:6242R127.0.0.1:6282/sdb4 1
       swift-ring-builder account.builder rebalance

   Note

   Syntax of adding device has been changed: `R<ip_replication>:<port_replication>` was added between `z<zone>-<ip>:<port>` and `/<device_name>_<meta> <weight>`. Added devices will use <ip_replication> and <port_replication> for replication activities.

2. Add next rows in `/etc/rsyncd.conf`:

       [account6252]
       max connections = 25
       path = /srv/1/node/
       read only = false
       lock file = /var/lock/account6252.lock

       [account6262]
       max connections = 25
       path = /srv/2/node/
       read only = false
       lock file = /var/lock/account6262.lock

       [account6272]
       max connections = 25
       path = /srv/3/node/
       read only = false
       lock file = /var/lock/account6272.lock

       [account6282]
       max connections = 25
       path = /srv/4/node/
       read only = false
       lock file = /var/lock/account6282.lock

       [container6251]
       max connections = 25
       path = /srv/1/node/
       read only = false
       lock file = /var/lock/container6251.lock

       [container6261]
       max connections = 25
       path = /srv/2/node/
       read only = false
       lock file = /var/lock/container6261.lock

       [container6271]
       max connections = 25
       path = /srv/3/node/
       read only = false
       lock file = /var/lock/container6271.lock

       [container6281]
       max connections = 25
       path = /srv/4/node/
       read only = false
       lock file = /var/lock/container6281.lock

       [object6250]
       max connections = 25
       path = /srv/1/node/
       read only = false
       lock file = /var/lock/object6250.lock

       [object6260]
       max connections = 25
       path = /srv/2/node/
       read only = false
       lock file = /var/lock/object6260.lock

       [object6270]
       max connections = 25
       path = /srv/3/node/
       read only = false
       lock file = /var/lock/object6270.lock

       [object6280]
       max connections = 25
       path = /srv/4/node/
       read only = false
       lock file = /var/lock/object6280.lock

3. Restart rsync daemon:

       service rsync restart

4. Update configuration files in directories:

   - /etc/swift/object-server(files: 1.conf, 2.conf, 3.conf, 4.conf)

   - /etc/swift/container-server(files: 1.conf, 2.conf, 3.conf, 4.conf)

   - /etc/swift/account-server(files: 1.conf, 2.conf, 3.conf, 4.conf)

   delete all configuration options in section `[<*>-replicator]`

5. Add configuration files for object-server, in `/etc/swift/object-server/`

   - 5.conf:

         [DEFAULT]
         devices = /srv/1/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6250
         user = swift
         log_facility = LOG_LOCAL2
         recon_cache_path = /var/cache/swift

         [pipeline:main]
         pipeline = recon object-server

         [app:object-server]
         use = egg:swift#object
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [object-replicator]
         rsync_module = {replication_ip}::object{replication_port}

   - 6.conf:

         [DEFAULT]
         devices = /srv/2/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6260
         user = swift
         log_facility = LOG_LOCAL3
         recon_cache_path = /var/cache/swift2

         [pipeline:main]
         pipeline = recon object-server

         [app:object-server]
         use = egg:swift#object
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [object-replicator]
         rsync_module = {replication_ip}::object{replication_port}

   - 7.conf:

         [DEFAULT]
         devices = /srv/3/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6270
         user = swift
         log_facility = LOG_LOCAL4
         recon_cache_path = /var/cache/swift3

         [pipeline:main]
         pipeline = recon object-server

         [app:object-server]
         use = egg:swift#object
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [object-replicator]
         rsync_module = {replication_ip}::object{replication_port}

   - 8.conf:

         [DEFAULT]
         devices = /srv/4/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6280
         user = swift
         log_facility = LOG_LOCAL5
         recon_cache_path = /var/cache/swift4

         [pipeline:main]
         pipeline = recon object-server

         [app:object-server]
         use = egg:swift#object
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [object-replicator]
         rsync_module = {replication_ip}::object{replication_port}

6. Add configuration files for container-server, in `/etc/swift/container-server/`

   - 5.conf:

         [DEFAULT]
         devices = /srv/1/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6251
         user = swift
         log_facility = LOG_LOCAL2
         recon_cache_path = /var/cache/swift

         [pipeline:main]
         pipeline = recon container-server

         [app:container-server]
         use = egg:swift#container
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [container-replicator]
         rsync_module = {replication_ip}::container{replication_port}

   - 6.conf:

         [DEFAULT]
         devices = /srv/2/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6261
         user = swift
         log_facility = LOG_LOCAL3
         recon_cache_path = /var/cache/swift2

         [pipeline:main]
         pipeline = recon container-server

         [app:container-server]
         use = egg:swift#container
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [container-replicator]
         rsync_module = {replication_ip}::container{replication_port}

   - 7.conf:

         [DEFAULT]
         devices = /srv/3/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6271
         user = swift
         log_facility = LOG_LOCAL4
         recon_cache_path = /var/cache/swift3

         [pipeline:main]
         pipeline = recon container-server

         [app:container-server]
         use = egg:swift#container
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [container-replicator]
         rsync_module = {replication_ip}::container{replication_port}

   - 8.conf:

         [DEFAULT]
         devices = /srv/4/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6281
         user = swift
         log_facility = LOG_LOCAL5
         recon_cache_path = /var/cache/swift4

         [pipeline:main]
         pipeline = recon container-server

         [app:container-server]
         use = egg:swift#container
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [container-replicator]
         rsync_module = {replication_ip}::container{replication_port}

7. Add configuration files for account-server, in `/etc/swift/account-server/`

   - 5.conf:

         [DEFAULT]
         devices = /srv/1/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6252
         user = swift
         log_facility = LOG_LOCAL2
         recon_cache_path = /var/cache/swift

         [pipeline:main]
         pipeline = recon account-server

         [app:account-server]
         use = egg:swift#account
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [account-replicator]
         rsync_module = {replication_ip}::account{replication_port}

   - 6.conf:

         [DEFAULT]
         devices = /srv/2/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6262
         user = swift
         log_facility = LOG_LOCAL3
         recon_cache_path = /var/cache/swift2

         [pipeline:main]
         pipeline = recon account-server

         [app:account-server]
         use = egg:swift#account
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [account-replicator]
         rsync_module = {replication_ip}::account{replication_port}

   - 7.conf:

         [DEFAULT]
         devices = /srv/3/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6272
         user = swift
         log_facility = LOG_LOCAL4
         recon_cache_path = /var/cache/swift3

         [pipeline:main]
         pipeline = recon account-server

         [app:account-server]
         use = egg:swift#account
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [account-replicator]
         rsync_module = {replication_ip}::account{replication_port}

   - 8.conf:

         [DEFAULT]
         devices = /srv/4/node
         mount_check = false
         disable_fallocate = true
         bind_port = 6282
         user = swift
         log_facility = LOG_LOCAL5
         recon_cache_path = /var/cache/swift4

         [pipeline:main]
         pipeline = recon account-server

         [app:account-server]
         use = egg:swift#account
         replication_server = True

         [filter:recon]
         use = egg:swift#recon

         [account-replicator]
         rsync_module = {replication_ip}::account{replication_port}

## For a Multiple Server replication

1. Move configuration file.

   - Configuration file for object-server from /etc/swift/object-server.conf to /etc/swift/object-server/1.conf

   - Configuration file for container-server from /etc/swift/container-server.conf to /etc/swift/container-server/1.conf

   - Configuration file for account-server from /etc/swift/account-server.conf to /etc/swift/account-server/1.conf

2. Add changes in configuration files in directories:

   - /etc/swift/object-server(files: 1.conf)

   - /etc/swift/container-server(files: 1.conf)

   - /etc/swift/account-server(files: 1.conf)

   delete all configuration options in section [<*>-replicator]

3. Add configuration files for object-server, in /etc/swift/object-server/2.conf:

       [DEFAULT]
       bind_ip = $STORAGE_LOCAL_NET_IP
       workers = 2

       [pipeline:main]
       pipeline = object-server

       [app:object-server]
       use = egg:swift#object
       replication_server = True

       [object-replicator]

4. Add configuration files for container-server, in /etc/swift/container-server/2.conf:

       [DEFAULT]
       bind_ip = $STORAGE_LOCAL_NET_IP
       workers = 2

       [pipeline:main]
       pipeline = container-server

       [app:container-server]
       use = egg:swift#container
       replication_server = True

       [container-replicator]

5. Add configuration files for account-server, in /etc/swift/account-server/2.conf:

       [DEFAULT]
       bind_ip = $STORAGE_LOCAL_NET_IP
       workers = 2

       [pipeline:main]
       pipeline = account-server

       [app:account-server]
       use = egg:swift#account
       replication_server = True

       [account-replicator]

this page last updated: 2026-08-18 20:34:00

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