# Live reconfiguration You can dynamically re-configure most of VerneMQ's settings on a running node by using the `vmq-admin set` command. {% hint style="warning" %} Settings dynamically configured with the `vmq-admin set` command will be reset by vernemq.conf upon broker restart. {% endhint %} ## 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 --node=VerneMQ20@192.168.1.20 ``` ## 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| +----------------------+------------------+--------------+ |VerneMQ20@192.168.1.50| 28 | 20 | +----------------------+------------------+--------------+ ` ``` ### For an arbitrary node ``` vmq-admin show max_client_id_size retry_interval --node VerneMQ20@192.168.1.20 ``` ### For all cluster nodes ``` vmq-admin show max_client_id_size retry_interval --all ``` ``` +----------------------+------------------+--------------+ | node |max_client_id_size|retry_interval| +----------------------+------------------+--------------+ |VerneMQ30@192.168.1.30| 33 | 20 | |VerneMQ40@192.168.1.40| 33 | 20 | |VerneMQ10@192.168.1.10| 33 | 20 | |VerneMQ50@192.168.1.50| 33 | 20 | |VerneMQ20@192.168.1.20| 28 | 20 | +----------------------+------------------+--------------+ ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.vernemq.com/1.7.1/administration/config_values.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.