redhat7 安装11g rac数据库会遇到多个问题，本文列出了常见问题和处理方法。
1 RHEL7中缺少包compat-libstdc++
（可以在RHEL6中找到，建议安装）
Installation of 12.1.0.2 Oracle Database Server/Client on RHEL 7/OL7 reports pre-requisite package 'compat-libstdc++' missing. (文档 ID 2062336.1)
SOLUTION:
compat-libstdc++-33-3.2.3 is still required due to bug 22477834.
Install the compat-libstdc++-33-3.2.3 and Proceed with the Database Installation.
2 执行root.sh 报错
Adding Clusterware entries to inittab
ohasd failed to start
Failed to start the Clusterware. Last 20 lines of the alert log follow:
2018-08-13 10:23:57.571:
[client(58661)]CRS-2101:The OLR was formatted using version 3需要安装补丁（p18370031_112040_Linux-x86-64.zip，p19404309_112040_Linux-x86-64.zip）
0201：软件安装之前，安装 p19404309_112040_Linux-x86-64.zip ：
[grid@prod04 rhel7 11204 patch]$ unzip p19404309_112040_Linux-x86-64.zip
[grid@prod04 rhel7 11204 patch]$ cp b19404309/grid/cvu_prereq.xml /soft/grid/stage/cvu/（安装软件包位置）
0202：执行root.sh 之前，在所有节点安装p18370031_112040_Linux-x86-64.zip：
grid@prod04 rhel7 11204 patch]$ unzip p18370031_112040_Linux-x86-64.zip ^C
[grid@prod04 rhel7 11204 patch]$ cd 18370031/
[grid@prod04 18370031]$ /u01/app/11.2.0/grid/OPatch/opatch apply
Oracle Interim Patch Installer version 11.2.0.3.4
Copyright (c) 2012, Oracle Corporation. All rights reserved.
Oracle Home : /u01/app/11.2.0/grid
Central Inventory : /u01/app/oraInventory
from : /u01/app/11.2.0/grid/oraInst.loc
OPatch version : 11.2.0.3.4
OUI version : 11.2.0.4.0
Log file location : /u01/app/11.2.0/grid/cfgtoollogs/opatch/18370031_Aug_13_2018_11_02_32/apply2018-08-13_11-02-32AM_1.log
Applying interim patch '18370031' to OH '/u01/app/11.2.0/grid'
Verifying environment and performing prerequisite checks...
All checks passed.
Please shutdown Oracle instances running out of this ORACLE_HOME on the local system.
(Oracle Home = '/u01/app/11.2.0/grid')
Is the local system ready for patching? [y|n]
y
User Responded with: Y
Backing up files...
Patching component oracle.crs, 11.2.0.4.0...
Verifying the update...
Patch 18370031 successfully applied
Log file location: /u01/app/11.2.0/grid/cfgtoollogs/opatch/18370031_Aug_13_2018_11_02_32/apply2018-08-13_11-02-32AM_1.log
OPatch succeeded.3 Error in invoking target 'agent nmhs' of makefile
error in invoking target 'agent nmhs' of make file ins_emagent.mk while installing Oracle 11.2.0.4 on Linux (文档 ID 2299494.1)
SOLUTION:
Edit $ORACLE_HOME/sysman/lib/ins_emagent.mk, search for the line
$(MK_EMAGENT_NMECTL)
Then replace the line with
$(MK_EMAGENT_NMECTL) -lnnz11
Then click “Retry” button to continue.
