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
   cd /etc/swift
   rm -f *.builder *.ring.gz backups/*.builder backups/*.ring.gz
   swift-ring-builder object.builder create 18 3 1
   swift-ring-builder object.builder add z1-127.0.0.1:6010R127.0.0.1:6050/sdb1 1
   swift-ring-builder object.builder add z2-127.0.0.1:6020R127.0.0.1:6060/sdb2 1
   swift-ring-builder object.builder add z3-127.0.0.1:6030R127.0.0.1:6070/sdb3 1
   swift-ring-builder object.builder add z4-127.0.0.1:6040R127.0.0.1:6080/sdb4 1
   swift-ring-builder object.builder rebalance
   swift-ring-builder container.builder create 18 3 1
   swift-ring-builder container.builder add z1-127.0.0.1:6011R127.0.0.1:6051/sdb1 1
   swift-ring-builder container.builder add z2-127.0.0.1:6021R127.0.0.1:6061/sdb2 1
   swift-ring-builder container.builder add z3-127.0.0.1:6031R127.0.0.1:6071/sdb3 1
   swift-ring-builder container.builder add z4-127.0.0.1:6041R127.0.0.1:6081/sdb4 1
   swift-ring-builder container.builder rebalance
   swift-ring-builder account.builder create 18 3 1
   swift-ring-builder account.builder add z1-127.0.0.1:6012R127.0.0.1:6052/sdb1 1
   swift-ring-builder account.builder add z2-127.0.0.1:6022R127.0.0.1:6062/sdb2 1
   swift-ring-builder account.builder add z3-127.0.0.1:6032R127.0.0.1:6072/sdb3 1
   swift-ring-builder account.builder add z4-127.0.0.1:6042R127.0.0.1:6082/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:

   [account6052]
   max connections = 25
   path = /srv/1/node/
   read only = false
   lock file = /var/lock/account6052.lock
   
   [account6062]
   max connections = 25
   path = /srv/2/node/
   read only = false
   lock file = /var/lock/account6062.lock
   
   [account6072]
   max connections = 25
   path = /srv/3/node/
   read only = false
   lock file = /var/lock/account6072.lock
   
   [account6082]
   max connections = 25
   path = /srv/4/node/
   read only = false
   lock file = /var/lock/account6082.lock
   
   
   [container6051]
   max connections = 25
   path = /srv/1/node/
   read only = false
   lock file = /var/lock/container6051.lock
   
   [container6061]
   max connections = 25
   path = /srv/2/node/
   read only = false
   lock file = /var/lock/container6061.lock
   
   [container6071]
   max connections = 25
   path = /srv/3/node/
   read only = false
   lock file = /var/lock/container6071.lock
   
   [container6081]
   max connections = 25
   path = /srv/4/node/
   read only = false
   lock file = /var/lock/container6081.lock
   
   
   [object6050]
   max connections = 25
   path = /srv/1/node/
   read only = false
   lock file = /var/lock/object6050.lock
   
   [object6060]
   max connections = 25
   path = /srv/2/node/
   read only = false
   lock file = /var/lock/object6060.lock
   
   [object6070]
   max connections = 25
   path = /srv/3/node/
   read only = false
   lock file = /var/lock/object6070.lock
   
   [object6080]
   max connections = 25
   path = /srv/4/node/
   read only = false
   lock file = /var/lock/object6080.lock
   

3. Restart rsync daemon:

   service rsync restart
   

4. Add changes in 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 = 6050
     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 = 6060
     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 = 6070
     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 = 6080
     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 = 6051
     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 = 6061
     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 = 6071
     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 = 6081
     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 = 6052
     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 = 6062
     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 = 6072
     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 = 6082
     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]