Hoy vamos a ver la manera de eliminar de manera limpia un nodo de un RAC .
Supondremos que queremos eliminar de nuestro cluster el nododo que llamamos rac1, los pasos a llevar a cabo seran:

Eliminar del nodo las bases de datos corriendo

Supongamos que tenemos la BBDD

ORACLE_BASE=/u01/app/oracle
ORACLE_HOME=/u01/app/oracle/product/12.1.0.2/db
ORACLE_SID=TEST1
DB_NAME=TEST
INSTANCE_NAME=TEST1
NODE_NAME=rac1

Para cada una de las bases de datos , la parariamos con :

 srvctl stop instance  -db $DB_NAME -i $INSTANCE_NAME

Y posteriormente la eliminariamos con:

rac1.pamplona.name:oracle (TEST:/u01/app/19c/grid) srvctl config database -db $DB_NAME
Database unique name: TEST
Database name:
Oracle home: /u01/app/oracle/product/12.1.0.2/db
Oracle user: oracle
Spfile: +DATA/TEST/PARAMETERFILE/spfile.357.935866381
Password file:
Domain:
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools:
Disk Groups: +DATA,+REDO,+FRA
Mount point paths:
Services:
Type: RAC
Start concurrency:
Stop concurrency:
OSDBA group: dba
OSOPER group: osoper
Database instances: TEST1,TEST2
Configured nodes: rac1,rac2
Database is administrator managed

dbca -silent -deleteInstance -nodeList rac1 -gdbName $DB_NAME -instanceName $INSTANCE_NAME -sysDBAUserName sys -sysDBAPassword syspass

Tras esto comprobariamos que no quedan bases de datos en este nodo con crsctl stat rs -t

Eliminams los recursos del cluster de ese nodo

Una vez hemos eliminado las bases de datos, eliminaremos los recursos del cluster.
El primer paso es mover la mgtdb y para el proxy

srvctl relocate mgmtdb -n rac2
srvctl stop asm -proxy -n wiractst01

Eliminamos el listener

srvctl disable listener -l LISTENER -n rac1
srvctl stop listener -l LISTENER -n rac1

Desinstalando los binarios del CRS

Con el entorno cargado el ASM procederemos a desinstalar los binarios del RAC , para este proposito usaremos el comando deinstall del $ORACLE_HOME deel nodo, este comando se encargara de hacernos una desinstalacion limpia borrandonos:

Configuraciones
Binarios
Interfaces de red virtuales

$ORACLE_HOME/deinstall/deinstall -local

rac1.pamplona.name:oracle (+ASM1:/u01/app/19c/grid/deinstall) $ORACLE_HOME/deinstall/deinstall -local
Checking for required files and bootstrapping ...
Please wait ...
Location of logs /u01/app/oraInventory/logs/

############ ORACLE DECONFIG TOOL START ############
######################### DECONFIG CHECK OPERATION START #########################
## [START] Install check configuration ##
Checking for existence of the Oracle home location /u01/app/19c/grid
Oracle Home type selected for deinstall is: Oracle Grid Infrastructure for a Cluster
Oracle Base selected for deinstall is: /u01/app/oracle
Checking for existence of central inventory location /u01/app/oraInventory
Checking for existence of the Oracle Grid Infrastructure home /u01/app/19c/grid
The following nodes are part of this cluster: rac1,rac2
Checking for sufficient temp space availability on node(s) : 'rac1'
## [END] Install check configuration ##

Traces log file: /u01/app/oraInventory/logs/crsdc_2021-03-23_09-16-26-PM.log
Network Configuration check config START
Network de-configuration trace file location: /u01/app/oraInventory/logs/netdc_check9_09-16-27PM.log
Network Configuration check config END
Asm Check Configuration START
ASM de-configuration trace file location: /u01/app/oraInventory/logs/asmcadc_check2021-03-23_09-16-27PM.log
Database Check Configuration START
Database de-configuration trace file location: /u01/app/oraInventory/logs/databasedc_check2021-03-23_09-16-27PM.log
Oracle Grid Management database was found in this Grid Infrastructure home
Database Check Configuration END
######################### DECONFIG CHECK OPERATION END #########################

####################### DECONFIG CHECK OPERATION SUMMARY #######################
Oracle Grid Infrastructure Home is: /u01/app/19c/grid
The following nodes are part of this cluster: rac1,rac2
The cluster node(s) on which the Oracle home deinstallation will be performed are:rac1
Oracle Home selected for deinstall is: /u01/app/19c/grid
Inventory Location where the Oracle home registered is: /u01/app/oraInventory
Option -local will not modify any ASM configuration.
Oracle Grid Management database was found in this Grid Infrastructure home
Oracle Grid Management database will be relocated to another node during deconfiguration of local node
Do you want to continue (y - yes, n - no)? [n]: y
A log of this session will be written to: '/u01/app/oraInventory/logs/deinstall_deconfig2021-03-23_09-16-21-PM.out'
Any error messages from this session will be written to: '/u01/app/oraInventory/logs/deinstall_deconfig2021-03-23_09-16-21-PM.err'

######################## DECONFIG CLEAN OPERATION START ########################
Database de-configuration trace file location: /u01/app/oraInventory/logs/databasedc_clean2021-03-23_09-16-27PM.log
ASM de-configuration trace file location: /u01/app/oraInventory/logs/asmcadc_clean2021-03-23_09-16-27PM.log
ASM Clean Configuration END

Network Configuration clean config START
Network de-configuration trace file location: /u01/app/oraInventory/logs/netdc_clean2021-03-23_09-16-27PM.log
Network Configuration clean config END
Run the following command as the root user or the administrator on node "wiractst01".
/u01/app/19c/grid/crs/install/rootcrs.sh -force  -deconfig -paramfile "/tmp/deinstall2021-03-23_09-15-25PM/response/deinstall_OraGI19Home1.rsp"
Press Enter after you finish running the above commands
<----------------------------------------

Ejecutamos el comando como root

[oracle@rac1~]$ sudo /u01/app/19c/grid/crs/install/rootcrs.sh -force  -deconfig -paramfile "/tmp/deinstall2021-03-23-15-25PM/response/deinstall_OraGI19Home1.rsp"
Using configuration parameter file: /tmp/deinstall2021-03-23_09-15-25PM/response/deinstall_OraGI19Home1.rsp
The log of current session can be found at:
  /u01/app/oraInventory/logs/crsdeconfig_wiractst01_2021-03-23_09-19-35PM.log
Redirecting to /bin/systemctl restart rsyslog.service
2021/04/09 21:23:06 CLSRSC-336: Successfully deconfigured Oracle Clusterware stack on this node

Y continuamos el proceso dandole a [ ENTER ]

######################### DECONFIG CLEAN OPERATION END #########################
####################### DECONFIG CLEAN OPERATION SUMMARY #######################
Local node configuration of Oracle Grid Management database was removed successfully
Oracle Clusterware is stopped and successfully de-configured on node "rac1"
Oracle Clusterware is stopped and de-configured successfully.
#######################################################################
############# ORACLE DECONFIG TOOL END #############
Using properties file /tmp/deinstall2021-03-23-15-25PM/response/deinstall_2021-03-23-16-21-PM.rsp
Location of logs /u01/app/oraInventory/logs/
############ ORACLE DEINSTALL TOOL START ############
####################### DEINSTALL CHECK OPERATION SUMMARY #######################
A log of this session will be written to: '/u01/app/oraInventory/logs/deinstall_deconfig2021-03-23-16-21-PM.out'
Any error messages from this session will be written to: '/u01/app/oraInventory/logs/deinstall_deconfig2021-03-23-16-21-PM.err'
######################## DEINSTALL CLEAN OPERATION START ########################
## [START] Preparing for Deinstall ##
Setting LOCAL_NODE to rac1
Setting CLUSTER_NODES to rac1
Setting CRS_HOME to true
Setting oracle.installer.invPtrLoc to /tmp/deinstall2021-03-23-15-25PM/oraInst.loc
Setting oracle.installer.local to true
## [END] Preparing for Deinstall ##
Setting the force flag to false
Setting the force flag to cleanup the Oracle Base
Oracle Universal Installer clean START
Detach Oracle home '/u01/app/19c/grid' from the central inventory on the local node : Done
Delete directory '/u01/app/19c/grid' on the local node : Done
The Oracle Base directory '/u01/app/oracle' will not be removed on local node. The directory is in use by Oracle Home '/u01/app/oracle/product/12.1.0.2/db'.
Oracle Universal Installer cleanup was successful.
Oracle Universal Installer clean END
## [START] Oracle install clean ##
## [END] Oracle install clean ##
######################### DEINSTALL CLEAN OPERATION END #########################

####################### DEINSTALL CLEAN OPERATION SUMMARY #######################
Successfully detached Oracle home '/u01/app/19/grid' from the central inventory on the local node.
Successfully deleted directory '/u01/app/19/grid' on the local node.
Oracle Universal Installer cleanup was successful.

Review the permissions and contents of '/u01/app/oracle' on nodes(s) 'rac1'.
If there are no Oracle home(s) associated with '/u01/app/oracle', manually delete '/u01/app/oracle' and its contents.
Oracle deinstall tool successfully cleaned up temporary directories.
#######################################################################
############# ORACLE DEINSTALL TOOL END #############

Ahora, iremos a uno de los nodos que quedan y eliminaremos el nodo 1

[root@rac2 ~]$ .oraenv
ORACLE_SID = [root] ? +ASM2
ORACLE_BASE environment variable is not being set since this
information is not available for the current user ID root.
You can set ORACLE_BASE manually if it is required.
Resetting ORACLE_BASE to its previous value or ORACLE_HOME
The Oracle base has been set to /u01/app/19c/grid

[root@rac2 ~]$  $ORACLE_HOME/bin/crsctl delete node -n  rac1
CRS-4661: Node rac1 successfully deleted.

Comprobamos de nuevo como usuario oracle el numero de nodos

rac2:oracle (+ASM2:/home/oracle) olsnodes -s -t
rac2  Active  Unpinned

Mas informacion en:

How to Add Node/Instance or Remove Node/Instance with Oracle Clusterware and RAC (Doc ID 1332451.1)
https://oracledbwr.com/step-by-step-deleting-node-in-oracle-rac-12c-release-1-environment

Mas entradas para dummies sobre RAC:
Comandos basicos en Orace RAC
Comandos basicos del RAC II
Eliminar un nodo del rac

Dba stuff

Un cajon desastre para el día a día

Eliminar un nodo del rac

Eliminar del nodo las bases de datos corriendo

Eliminams los recursos del cluster de ese nodo

Desinstalando los binarios del CRS

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