Redis Cluster lib in Python2
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README.md

Redis cluster CLI tools and libraries in Python. It supports Python 2.7 and 3.5 or higher. It supports Redis 3.x and 4.x cluster mode.

Installation

pip install redis-trib
easy_install redis-trib

Usage

NOTE: The following console commands or APIs do not support simultaneous operations on one cluster.

Console Commands

Cluster Manipulation

Create a cluster in some redis nodes (the nodes are cluster enabled, and none of them in any cluster)

redis-trib.py create NODE_HOST_a:PORT_a NODE_HOST_b:PORT_b ...

Add another node to a cluster, but neither set as slave nor migrating slots to it

redis-trib.py add_node --existing-addr CLUSTER_HOST:PORT --new-addr NEW_NODE_HOST:PORT

Add a slave node to a master (slave should not in any cluster)

redis-trib.py replicate --master-addr MASTER_HOST:PORT --slave-addr SLAVE_HOST:PORT

Remove a node from its cluster

redis-trib.py del_node --addr NODE_HOST:PORT

Shutdown an empty cluster (there is only one node left and no keys in the node)

redis-trib.py shutdown --addr NODE_HOST:PORT

Fix migrating slots in a node

redis-trib.py fix --addr HOST_HOST:PORT

Migrate slots (require source node holding all the migrating slots, and the two nodes are in the same cluster)

redis-trib.py migrate --src-addr SRC_HOST:PORT --dst-addr DST_HOST:PORT SLOT SLOT_BEGIN-SLOT_END

Rescue a failed cluster, specify host, port of one node in the cluster, and a free node

redis-trib.py rescue --existing-addr CLUSTER_NODE_HOST:PORT --new-addr NEW_NODE_HOST:PORT

List Cluster Nodes

List nodes in a cluster and output simple master slave relationship between them

redis-trib.py list --addr HOST:PORT

Output:

Total 4 nodes, 2 masters, 0 fail
M  127.0.0.1:7001 master 0
M  127.0.0.1:7003 master 8000
 S 127.0.0.1:7000 myself,slave 127.0.0.1:7003
 S 127.0.0.1:7002 slave 127.0.0.1:7003
M  127.0.0.1:7005 master 8384
 S 127.0.0.1:7004 slave 127.0.0.1:7005

Each line represent one Redis node and a leading M means it is a master, while a leading S means slave. The second column contains address, the third contains its flags, the last column contains the number of slots assigned to it if it is a master, or its master's address if it is a slave.

Lines are sorted by the master addresses, and each slave will be displayed after its master.

The format may be changed in the future. If you need a stable API, use Redis CLUSTER NODES command instead. Or use the redistrib.command.list_nodes Python API, which is mentioned below.

Execute Command

Execute a command on each cluster node

redis-trib.py execute --addr HOST:PORT COMMAND ARGS...
redis-trib.py execute --addr HOST:PORT --master-only COMMAND ARGS...
redis-trib.py execute --addr HOST:PORT --slave-only COMMAND ARGS...

For example:

redis-trib.py execute --addr 127.0.0.1 PING

Output:

127.0.0.1:7001 +PONG
127.0.0.1:7002 +PONG
127.0.0.1:7003 +PONG
127.0.0.1:7000 +PONG

More Examples

Please read the wiki.

Python APIs

Cluster Operation APIs

import redistrib.command

# start cluster on multiple nodes, all the slots will be shared among them
# the first argument is a list of (HOST, PORT) tuples
# for example, the following call will start a cluster on 127.0.0.1:7000 and 127.0.0.1:7001
# this API will run the "cluster addslots" command on the Redis server;
#   you can limit the number of slots added to the Redis in each command by the `max_slots` argument
redistrib.command.create([('127.0.0.1', 7000), ('127.0.0.1', 7001)], max_slots=16384)

# add node 127.0.0.1:7001 to the cluster as a master
redistrib.command.add_node('127.0.0.1', 7000, '127.0.0.1', 7001)

# add node 127.0.0.1:7002 to the cluster as a slave to 127.0.0.1:7000
redistrib.command.replicate('127.0.0.1', 7000, '127.0.0.1', 7002)

# remove node 127.0.0.7000 from the cluster
redistrib.command.del_node('127.0.0.1', 7000)

# shut down the cluster
redistrib.command.shutdown_cluster('127.0.0.1', 7001)

# fix a migrating slot in a node
redistrib.command.fix_migrating('127.0.0.1', 7001)

# migrate slots; require source node holding the slots

# migrate slots #1, #2, #3 from 127.0.0.1:7001 to 127.0.0.1:7002
redistrib.command.migrate_slots('127.0.0.1', 7001, '127.0.0.1', 7002, [1, 2, 3])

# rescue a failed cluster
# 127.0.0.1:7000 is one of the nodes that is still alive in the cluster
# and 127.0.0.1:8000 is the node that would take care of all failed slots
redistrib.command.rescue_cluster('127.0.0.1', 7000, '127.0.0.1', 8000)

Cluster Status APIs

import redistrib.command

# list all cluster nodes (attributes of which shown in the next section)
# args
#   - host: host of specified node
#   - port: port of specified node
#   - default_host: default host string if the specified node doesn't know its host
#   - filter_func: filter function that takes one ClusterNode parameter
#                  and returns False if the node should be excluded from the result
# returns
#   - nodes: all cluster nodes
#   - myself: the specified node itself, also contained by nodes
nodes, myself = redistrib.command.list_nodes('127.0.0.1', 7000, default_host='127.0.0.1',
                                             filter_func=lambda node: True)

# list all master nodes
# args same as list_nodes
# returns
#   - nodes: all master nodes
#   - myself: the specified node itself, contained by nodes if it's a master; won't be None even if it's a slave
nodes, myself = redistrib.command.list_masters('127.0.0.1', 7000, default_host='127.0.0.1')

Classes

redistrib.clusternode.ClusterNode: cluster node, attributes:

  • node_id: node id
  • host: known host, this value could be empty string if the node is newly launched
  • port: listening port
  • master: if the node is a master
  • slave: if the node is a slave
  • role_in_cluster: "master" or "slave"
  • fail: if the node is marked as "fail" or "fail?"
  • master_id: master's node_id if it's a slave, or None otherwise
  • assigned_slots: a list of assigned slots if it's a master; it won't contain slots being migrated
  • slots_migrating: boolean value for whether there are any slot(s) migrating or importing on this node