When you start your Managed Server there is a prompt for Weblogic Username and Password. You can avoid this by creating a properties file with the username and password to avoid typing everytime.
Creating boot.properties
Step 1
Create file boot.properties with the following content
username=weblogic
password=welcome1
password=welcome1
Step 2
Place the boot.properties under your managed server directory
For ex: /user_projects/domains/kalyan_domain/servers/soa_server1/security
If security folder is not available create one and place the file under that.
Alternative
You can also pass parameter
"-Dweblogic.system.BootIdentityFile=path_to_your_file" to JAVA_OPTIONS variable in your setDomainEnv.sh file