Oracle环境：
版本：Oracle 11gR2 RAC （Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production）
Rac节点信息：
| 主机名 | SID | SERVICE_NAME |
| rac1 | racdb1 | racdb |
| rac2 | racdb2 | racdb |
Host文件：
安装过程：
1、创建asmsnmp用户：
su - grid
sqlplus / as sysasm
create user asmsnmp identified by 123456;
grant sysdba to asmsnmp;2、ASM实例注册于listener_scan1：
alter system set remote_listener='racscan:1521' scope=both sid='*';
alter system register;3、查看cluster name：
/u01/app/11.2.0/grid/bin/cemutlo -n4、重归EM：
su - oracle
emca -config dbcontrol db -repos recreate -cluster配置过程如下：
[oracle@rac1 ~]$ emca -config dbcontrol db -repos recreate -cluster
STARTED EMCA at Sep 29, 2018 5:40:04 PM
EM Configuration Assistant, Version 11.2.0.0.2 Production
Copyright (c) 2003, 2005, Oracle. All rights reserved.Enter the following information:
Database unique name: racdb
Service name: racdb
Listener port number: 1521
Listener ORACLE_HOME [ /u01/app/11.2.0/grid ]:
Password for SYS user:
Password for DBSNMP user:
Password for SYSMAN user:
Cluster name: rac-cluster
Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
ASM ORACLE_HOME [ /u01/app/11.2.0/grid ]:
ASM port [ 1521 ]:
ASM username [ ASMSNMP ]:
ASM user password:
-----------------------------------------------------------------You have specified the following settings
Database ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1
Database instance hostname ................ rac1
Listener ORACLE_HOME ................ /u01/app/11.2.0/grid
Listener port number ................ 1521
Cluster name ................ rac-cluster
Database unique name ................ racdb
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............
ASM ORACLE_HOME ................ /u01/app/11.2.0/grid
ASM port ................ 1521
ASM user role ................ SYSDBA
ASM username ................ ASMSNMP-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: y
Sep 29, 2018 5:41:06 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/racdb/emca_2018_09_29_17_40_04.log.
Sep 29, 2018 5:41:09 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) ...
Sep 29, 2018 5:45:29 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Sep 29, 2018 5:45:30 PM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Sep 29, 2018 5:53:53 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
Sep 29, 2018 5:53:59 PM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while) ...
Sep 29, 2018 5:55:00 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Uploaded configuration data successfully
Sep 29, 2018 5:55:01 PM oracle.sysman.emcp.EMDBCConfig instantiateOC4JConfigFiles
INFO: Propagating /u01/app/oracle/product/11.2.0/dbhome_1/oc4j/j2ee/OC4J_DBConsole_rac1_racdb to remote nodes ...
Sep 29, 2018 5:55:03 PM oracle.sysman.emcp.EMDBCConfig instantiateOC4JConfigFiles
INFO: Propagating /u01/app/oracle/product/11.2.0/dbhome_1/oc4j/j2ee/OC4J_DBConsole_rac2_racdb to remote nodes ...
Sep 29, 2018 5:55:09 PM oracle.sysman.emcp.EMAgentConfig deployStateDirs
INFO: Propagating /u01/app/oracle/product/11.2.0/dbhome_1/rac1_racdb to remote nodes ...
Sep 29, 2018 5:55:11 PM oracle.sysman.emcp.EMAgentConfig deployStateDirs
INFO: Propagating /u01/app/oracle/product/11.2.0/dbhome_1/rac2_racdb to remote nodes ...
Sep 29, 2018 5:55:13 PM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary
INFO: Location /u01/app/oracle/product/11.2.0/dbhome_1/EMStagePatches_racdb is not shared. Software library could not be configured. Provisioning archives will not be deployed. Please configure it manually.
Sep 29, 2018 5:55:13 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while) ...
Sep 29, 2018 5:55:32 PM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Sep 29, 2018 5:58:24 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Sep 29, 2018 5:58:25 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is https://rac1:1158/em <<<<<<<<<<<
Sep 29, 2018 5:58:32 PM oracle.sysman.emcp.EMDBPostConfig showClusterDBCAgentMessage
INFO:
**************** Current Configuration ****************
INSTANCE NODE DBCONTROL_UPLOAD_HOST
---------- ---------- ---------------------racdb rac1 rac1
racdb rac2 rac1
Sep 29, 2018 5:58:32 PM oracle.sysman.emcp.EMDBPostConfig invoke
WARNING:
************************ WARNING ************************Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted. The encryption key has been placed in the file: /u01/app/oracle/product/11.2.0/dbhome_1/rac1_racdb/sysman/config/emkey.ora. Please ensure this file is backed up as the encrypted data will become unusable if this file is lost.
***********************************************************
Enterprise Manager configuration completed successfully
FINISHED EMCA at Sep 29, 2018 5:58:33 PM
5、启动EM：
分别在两个节点的oracle用户下运行：
[oracle@rac1 ~]$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0
Copyright (c) 1996, 2009 Oracle Corporation. All rights reserved.
https://rac1:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control .............. started.
------------------------------------------------------------------
Logs are generated in directory /u01/app/oracle/product/11.2.0/dbhome_1/rac1_racdb/sysman/log
[oracle@rac2 ~]$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0
Copyright (c) 1996, 2009 Oracle Corporation. All rights reserved.
https://rac1:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control .......... started.
------------------------------------------------------------------
Logs are generated in directory /u01/app/oracle/product/11.2.0/dbhome_1/rac2_racdb/sysman/log
6、在IE浏览器中打开地址：https://racscan:1158/em ，登录即可
