Nacos permissions and databases

1、nacos Open permission , modify application.properties Among them nacos.core.auth.enabled=true; Default password nacos/nacos; stay nacos Console modification nacos Password and new user 、 New character 、 Role authorization ;

• A new user
• New character , namely : Connected characters ; Create a new role for a user , Therefore, existing roles cannot be associated with other users （ It's awkward, isn't it ）;
• Role authorization , Authorize read and write permissions for one namespace at a time ;

2、 I'll build a new one read-only Privileged user , Discovery can only be used for config Authorization of , Service registration still needs Write jurisdiction .
3、config The default namespace is public,config Use public Namespace , Cannot write spring cloud Parameters , Because the default public Space ID It's empty. ;

# The following notes if opened , Unable to read the configuration 
#spring.cloud.nacos.config.namespace=public

4、 The default data store is embedded Derby database
Derby Database access , from Derby Download the distribution package on the official website , Use at least JDK9 Support Derby Command line execution ;
ij yes Derby Client command line

# Set up jdk Temporary variable 
$ export JAVA_HOME /home/jdk-9.0.4
$ echo $JAVA_HOME
/home/jdk-9.0.4
$ ./ij
ij  edition  10.15
ij> connect 'jdbc:derby:/home/nacos/data/derby-data';
ij> show tables;
ij> select * from nacos.users;
ij> select * from nacos.roles;