Selecting a different primary replica
If a cluster has several replicas, you can select a different primary replica (master) as required.
Switching takes on average less than a minute. The cluster may be unavailable for writing for several seconds while switching is taking place.
For more information about selecting a different primary replica, see the MongoDB documentation
- Go to the folder page
and select Managed Service for MongoDB. - Click the cluster name and open the Hosts tab.
- Click
in thePRIMARY
host row and select Step down.
If you do not have the Yandex Cloud CLI yet, install and initialize it.
The folder specified in the CLI profile is used by default. You can specify a different folder through the --folder-name
or --folder-id
parameter.
To change a cluster's primary replica, run the command:
yc managed-mongodb hosts stepdown <current_primary_replica_name> \
--name=<cluster_name>
You can request the name of the shard primary replica with the list of cluster hosts and the cluster name, with the list of clusters in the folder.
-
Get an IAM token for API authentication and put it into the environment variable:
export IAM_TOKEN="<IAM_token>"
-
Use the Cluster.StepdownHosts method and send the following request, e.g., via cURL
:curl \ --request POST \ --header "Authorization: Bearer $IAM_TOKEN" \ --header "Content-Type: application/json" \ --url 'https://mdb.api.cloud.yandex.net/managed-mongodb/v1/clusters/<cluster_ID>:stepdownHosts' \ --data '{ "hostNames": [ "<current_primary_replica_name>" ] }'
You can get the cluster ID with the list of clusters in the folder, and the name of the shard primary replica, with the list of cluster hosts.
-
View the server response to make sure the request was successful.
-
Get an IAM token for API authentication and put it into the environment variable:
export IAM_TOKEN="<IAM_token>"
-
Clone the cloudapi
repository:cd ~/ && git clone --depth=1 https://github.com/yandex-cloud/cloudapi
Below, we assume the repository contents are stored in the
~/cloudapi/
directory. -
Use the ClusterService.StepdownHosts call and send the following request, e.g., via gRPCurl
:grpcurl \ -format json \ -import-path ~/cloudapi/ \ -import-path ~/cloudapi/third_party/googleapis/ \ -proto ~/cloudapi/yandex/cloud/mdb/mongodb/v1/cluster_service.proto \ -rpc-header "Authorization: Bearer $IAM_TOKEN" \ -d '{ "cluster_id": "<cluster_ID>", "host_names": [ "<current_primary_replica_name>" ] }' \ mdb.api.cloud.yandex.net:443 \ yandex.cloud.mdb.mongodb.v1.ClusterService.StepdownHosts
You can get the cluster ID with the list of clusters in the folder, and the name of the shard primary replica, with the list of cluster hosts.
-
View the server response to make sure the request was successful.