Live reconfiguration
You can dynamically re-configure most of VerneMQ's settings on a running node by using the vmq-admin set
command.
Settings dynamically configured with the vmq-admin set
command will be reset by vernemq.conf upon broker restart.
Setting a value for the local node
Let's change the max_client_id_size
as an example. (We might have noticed that some clients can't login because their client ID is too long, but we don't want to restart the broker for that). Note that you can also set multiple values with the same command.
vmq-admin set max_client_id_size=45
Setting a value for an arbitrary cluster node
vmq-admin set max_client_id_size=45 [email protected]
Setting a value for all cluster nodes
vmq-admin set max_client_id_size=45 --all
Show current VerneMQ config values
For the local node
You can show one or multiple values in a simple table:
vmq-admin show max_client_id_size retry_interval
+----------------------+------------------+--------------+
| node |max_client_id_size|retry_interval|
+----------------------+------------------+--------------+
|[email protected]| 28 | 20 |
+----------------------+------------------+--------------+
`
For an arbitrary node
vmq-admin show max_client_id_size retry_interval --node [email protected]
For all cluster nodes
vmq-admin show max_client_id_size retry_interval --all
+----------------------+------------------+--------------+
| node |max_client_id_size|retry_interval|
+----------------------+------------------+--------------+
|[email protected]| 33 | 20 |
|[email protected]| 33 | 20 |
|[email protected]| 33 | 20 |
|[email protected]| 33 | 20 |
|[email protected]| 28 | 20 |
+----------------------+------------------+--------------+
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