前段时间某客户要求在CENTOS7上部署Oracle 11.2.0.4 single instance && ASM存储，遇到一个比较头疼的问题，好在已经处理完了。
在图形化执行安装程序过程中，按照提示执行root.sh脚本失败，无法创建ohasd守护进程，而造成此现象的根本原因是RHEL7的服务管理机制有变化。
- Install of Clusterware fails while running root.sh on OL7 - ohasd fails to start (Doc ID 1959008.1)
- Patch 18370031: RC SCRIPTS (/ETC/RC.D/RC.* , /ETC/INIT.D/* ) ON OL7 FOR CLUSTERWARE
根本解决方法：
MOS提供的方案：
Because Oracle Linux 7 (and Redhat 7) use systemd rather than initd for starting/restarting processes and runs them as a service the current > software install of both 11.2.0.4 & 12.1.0.1 will not succeed because the ohasd process does not start properly.
In OL7 it needs to be set up as a service and patch fix for Bug 18370031 needs to be applied for this , BEFORE you run root.sh when prompted .
Need to apply the patch 18370031 for 11.2.0.4 .
也可以使用手工添加服务的方式配置ohasd服务自启动：
touch /usr/lib/systemd/system/ohas.service chmod 777 /usr/lib/systemd/system/ohas.service
cat /usr/lib/systemd/system/ohasd.service
# Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. # # Oracle OHASD startup [Unit] Description=Oracle High Availability Services After=syslog.target [Service] ExecStart=/etc/init.d/init.ohasd run >/dev/null 2>&1 Type=simple Restart=always [Install] WantedBy=multi-user.target
添加启动服务：
systemctl daemon-reload systemctl enable ohas.service systemctl start ohas.service
检查服务运行状态：
systemctl status ohasd.service
按提示清除先前执行root.sh脚本完成的配置，重新执行文件root.sh：
/u01/app/11.2.0/grid/perl/bin/perl -I/u01/app/11.2.0/grid/perl/lib -I/u01/app/11.2.0/grid/crs/install /u01/app/install/roothas.pl -deconfig -force
如图所示：
