What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?

By using DCS Redis instances, Spring Session can implement session sharing. When interconnecting with Spring Cloud, the following error information is displayed:

Figure 1 Spring Cloud error information

For security purposes, DCS does not support the CONFIG command initiated by a client. You need to perform the following steps:

1. On the DCS console, set the value of the notify-keyspace-event parameter to Egx for a DCS Redis instance.
2. Add the following content to the XML configuration file of the Spring framework:

   <util:constant
       static-field="org.springframework.session.data.redis.config.ConfigureRedisAction.NO_OP"/>

3. Modify the related Spring code. Enable the ConfigureRedisAction.NO_OP bean component to forbid a client to invoke the CONFIG command.

   @Bean
   public static ConfigureRedisAction configureRedisAction() {
       return ConfigureRedisAction.NO_OP;
   }

For more information, see the Spring Session Documentation.

Single-node, master/standby, and read/write splitting DCS Redis instances support spring session sharing, but cluster ones do not support.