1、系统环境：
OEL6.5企业版
2、报错信息：
$ crs_stat -t? ? ? ? ? ? ? ?
CRS-0184: Cannot communicate with the CRS daemon.? ? ? ? ? ? ? ?
$ crsctl check has? ? ? ? ? ? ? ?
CRS-4639: Could not contact Oracle High Availability Services
3、报错原因查找：
在节点1节点查看IP地址，VIP已经不存在
$ ifconfig -a? ? ? ? ? ? ? ?
en0: flags=1e080863,480
? ? ? ? inet 192.168.0.117 netmask 0xffffff00 broadcast 192.168.0.255? ? ? ? ? ? ? ?
? ? ? ? tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1? ? ? ? ? ? ? ?
en1: flags=1e080863,480
? ? ? ? inet 10.10.10.1 netmask 0xff000000 broadcast 10.255.255.255? ? ? ? ? ? ? ?
? ? ? ? tcp_sendspace 65536 tcp_recvspace 65536 rfc1323 1? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
在节点2上运行“crs_stat -t”发现，节点1好像已经退出集群环境
# su - grid
$ crs_stat -t
Name? ? ? ? ? Type? ? ? ? ? Target? ? State? ? Host? ? ? ?
------------------------------------------------------------
ora.DATA.dg? ? ora....up.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora....ER.lsnr? ora....er.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora....N1.lsnr? ora....er.type? ? ? ? ONLINE? ? OFFLINE? ? ? ? ? ? ?
ora.OCR.dg? ? ora....up.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.asm? ? ? ora.asm.type? ? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.cvu? ? ? ora.cvu.type? ? ? ? ? ONLINE? ? OFFLINE? ? ? ? ? ? ?
ora.gsd? ? ? ora.gsd.type? ? ? ? ? OFFLINE? OFFLINE? ? ? ? ? ? ?
ora....network? ora....rk.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.node1.vip? ora....t1.type? ? ? ? ONLINE? ? OFFLINE? ? ? ? ? ? ?
ora....SM2.asm? application? ? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora....E2.lsnr? application? ? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.node2.gsd? application? ? ? ? ? OFFLINE? OFFLINE? ? ? ? ? ? ?
ora.node2.ons? application? ? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.node2.vip? ora....t1.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.oc4j? ? ? ora.oc4j.type? ? ? ? ONLINE? ? OFFLINE? ? ? ? ? ? ?
ora.ons? ? ? ora.ons.type? ? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.prod.db? ? ora....se.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora....ry.acfs? ora....fs.type? ? ? ? ONLINE? ? ONLINE? ? node2? ? ?
ora.scan1.vip? ora....ip.type? ? ? ? ONLINE? ? OFFLINE? ? ? ? ? ? ?
从输出中看到节点1的VIP已经飘逸到节点2，从而判断节点1已经脱离集群。
通过"ifconfig"查看节点2上的ip信息。
4、问题解决：
清理节点1的配置信息，打算重新运行root.sh
# /u01/app/11.2.0/grid/crs/install/rootcrs.pl -verbose -deconfig -force
Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params
PRCR-1119 : Failed to look up CRS resources of ora.cluster_vip_net1.type type
PRCR-1068 : Failed to query resources
Cannot communicate with crsd
PRCR-1070 : Failed to check if resource ora.gsd is registered
Cannot communicate with crsd
PRCR-1070 : Failed to check if resource ora.ons is registered
Cannot communicate with crsd
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4000: Command Stop failed, or completed with errors.
CRS-4544: Unable to connect to OHAS
CRS-4000: Command Stop failed, or completed with errors.
ACFS-9313: No ADVM/ACFS installation detected.
Successfully deconfigured Oracle clusterware stack on this node
#
#
# /u01/app/11.2.0/grid/crs/install/roothas.pl -verbose -deconfig -force
Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params
CRS-4047: No Oracle Clusterware components configured.
CRS-4000: Command Stop failed, or completed with errors.
CRS-4047: No Oracle Clusterware components configured.
CRS-4000: Command Delete failed, or completed with errors.
CRS-4047: No Oracle Clusterware components configured.
CRS-4000: Command Stop failed, or completed with errors.
You must kill ohasd processes or reboot the system to properly