MongoDB
- By Canonical Data Platform
- Databases
Channel | Revision | Published | Runs on |
---|---|---|---|
6/stable | 199 | 04 Oct 2024 | |
6/candidate | 199 | 04 Oct 2024 | |
6/beta | 199 | 04 Oct 2024 | |
6/edge | 201 | 10 Oct 2024 | |
5/stable | 117 | 20 Apr 2023 | |
5/candidate | 117 | 20 Apr 2023 | |
5/edge | 139 | 21 Nov 2023 | |
5/edge | 109 | 06 Mar 2023 | |
3.6/stable | 100 | 28 Apr 2023 | |
3.6/candidate | 100 | 13 Apr 2023 | |
3.6/edge | 100 | 03 Feb 2023 |
juju deploy mongodb --channel 6/beta
Deploy universal operators easily with Juju, the Universal Operator Lifecycle Manager.
Platform:
How to scale replicas and shards
In this guide you will find instructions on how to scale your replica set and sharded cluster.
Summary
- Scale a replica set
- Add replicas to a replica set
- Remove replicas from a replica set
- Retrieve primary replica
- Scale a sharded cluster
- Add shards to a cluster
- Remove shards from a cluster
Scale a replica set
To scale a replica set, simply use juju
’s add-unit
and remove-unit
commands.
Add replicas
To add more replicas, run:
juju add-unit <application_name> -n <num_of_replicas_to_add>
Where an application
can be either a bare replica set, shard, or config-server.
Remove replicas
remove-unit
allows removing more than one replica so long as they do not constitute the majority of the replicas.
To remove replicas, run:
juju remove-unit <application_name>/<unit_number> <application_name>/<unit_number>
Where an application
can be either a bare replica set, shard, or config-server.
Retrieve primary replica
To retrieve the primary replica, use the juju
action get-primary
:
juju run <application_name>/<unit_number> get-primary
Where an application
can be either a bare replica set, shard, or config-server.
Scale a sharded cluster
Add shards to a cluster
To add a shard to a cluster, first deploy the new shard.To deploy a shard named new-shard
, run:
juju deploy mongodb --config role="shard" new-shard -n <number of replicas for shard>
Wait for the shard to show blocked
and idle
with juju status --watch 1s
.
Next, add it to your config-server:
juju integrate <config-server-name>:config-server new-shard:sharding
Remove shards from a cluster
Like official MongoDB, Charmed MongoDB does not support removing the last shard.To remove a shard named new-shard
that is not the last, run:
juju remove-relation <config-server-name>:config-server new-shard:sharding
You can watch your sharded cluster scale down with juju status --watch 1s
.
Once the shard is drained, you can fully remove it with:
juju remove-application new-shard