[grid@SCCS2 ~]$ cluvfy comp peer -refnode SCCS2 -n SCCS3 -verbose

[grid@SCCS2 ~]$ cluvfy stage -pre nodeadd -n SCCS3 -fixup -verbose

[grid@SCCS2 ~]$ cd $ORACLE_HOME/addnode
[grid@SCCS2 addnode]$ ./addnode.sh -silent -ignoreSysPrereqs 
-ignorePrereqFailure "CLUSTER_NEW_NODES={SCCS3}" 
"CLUSTER_NEW_PRIVATE_NODE_NAMES={SCCS3-priv}" 
"CLUSTER_NEW_VIRTUAL_HOSTNAMES={SCCS3-vip}"

[oracle@SCCS2 ~]$ cd $ORACLE_HOME/addnode
[oracle@SCCS2 addnode]$ ./addnode.sh -silent 
"CLUSTER_NEW_NODES={sccs3}"

[oracle@SCCS2 addnode]$ dbca -ignorePreReqs -
ignorePrereqFailure -silent -addInstance -nodeName SCCS3 -
gdbName SCCS -instanceName SCCS3 -sysDBAUserName sys -
sysDBAPassword 123456

SQL>select inst_id,open_mode from gv$database;
INST_ID OPEN_MODE
---------- --------------------
3 READ WRITE
2 READ WRITE

[FATAL] [INS-32156] Installer has detected that there are non-readable files in oracle home.
CAUSE: Following files are non-readable, due to insufficient permission
bin/log_file_client.log。

cd /u01/app/19.0.0/grid/bin
chown root:oinstall log_file_client.log

[FATAL] [INS-40912] Virtual host name: SCCS1-vip is assigned to another system on the network.
CAUSE: One or more virtual host names appeared to be 
assigned to another system on the network.
ACTION: Ensure that the virtual host names assigned to each 
of the nodes in the cluster are not currently in use, and 
the IP addresses are registered to the domain name you want 
to use as the virtual host name.

ifconfig enp0s8:3 192.168.100.141 netmask 255.255.255.0 down  
--在现有的正常节点执行