Scale in a cluster

This topic describes how to remove a specified node from a cluster by using the obshell-sdk-python library.

Considerations

Before you scale in a cluster, make sure that the following conditions are met:

• The client that sends the request must be a node in the cluster to be scaled in, and the node cannot be the one to be removed.

• The obshell service must be running.

Sample code

from obshell import ClientSet
from obshell.auth import PasswordAuth

# Create a client instance. The node address is '10.10.10.1' and the port is 2886.
# The root@sys password of the cluster is '****'.
client = ClientSet("10.10.10.1", 2886, PasswordAuth("****"))

# Remove the node '10.10.10.3:2886' from the cluster.
client.v1.scale_in_sync("10.10.10.3", 2886)

from obshell import ClientSet
from obshell.auth import PasswordAuth

# Create a client instance. The node address is '10.10.10.1' and the port is 2886.
# The root@sys password of the cluster is '****'.
client = ClientSet("10.10.10.1", 2886, PasswordAuth("****"))

# Remove the node '10.10.10.3:2886' from the cluster.
dag = client.v1.scale_in("10.10.10.3", 2886)
# Wait for the task to complete.
if dag is not None:
    client.v1.wait_dag_succeed(dag.generic_id)

References

• For more information about the API operations related to scaling in a cluster, see Scale in a cluster.

• For more information about how to call the API operations by using the obshell-sdk-go library, see Scale in a cluster.