I small white, just began to learn oracle, on the Internet to find a tutorial on building 19 c rac environment, is according to the teacher's tutorial step by step installation,
https://www.cnblogs.com/jyzhao/p/11275812.html
Finally DBCA built library, to this step

Rac1 system always restart, baidu and what not, please god to give directions, thank you,
The two nodes are Redhat7.6
Oracle is 19.3
This is the log capture