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由于dns服务为启动导致的GI集群启动故障
1、物业由于突然断电导致grid集群重新启动后rac数据库无法正常启动，对集群进行检查，结果如下，发现其中有4个数据库状态为instance shutdown。
[root@node1 ~]# su - grid
[grid@node1 ~]$ crsctl status res -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.FLASH.dg
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.GRIDDG.dg
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.LISTENER.lsnr
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.LTDG.dg
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.ORADG.dg
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.asm
ONLINE ONLINE node1 Started
ONLINE ONLINE node2 Started
ONLINE ONLINE node3 Started
ONLINE ONLINE node4 Started
ONLINE ONLINE node5 Started
ONLINE ONLINE node6 Started
ora.gsd
OFFLINE OFFLINE node1
OFFLINE OFFLINE node2
OFFLINE OFFLINE node3
OFFLINE OFFLINE node4
OFFLINE OFFLINE node5
OFFLINE OFFLINE node6
ora.net1.network
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.ons
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
ora.registry.acfs
ONLINE ONLINE node1
ONLINE ONLINE node2
ONLINE ONLINE node3
ONLINE ONLINE node4
ONLINE ONLINE node5
ONLINE ONLINE node6
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Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE node2
ora.LISTENER_SCAN2.lsnr
1 ONLINE ONLINE node3
ora.LISTENER_SCAN3.lsnr
1 ONLINE ONLINE node1
ora.cvu
1 ONLINE ONLINE node3
ora.efmisdb.db
1 ONLINE OFFLINE Instance Shutdown
ora.efmisdb.efmissrv.svc
1 ONLINE OFFLINE
ora.faspdb.db
1 ONLINE OFFLINE Instance Shutdown
ora.faspdb.faspsvc.svc
1 ONLINE OFFLINE
ora.ltdb.db
1 ONLINE OFFLINE Instance Shutdown
2 ONLINE OFFLINE Instance Shutdown
ora.node1.vip
1 ONLINE ONLINE node1
ora.node2.vip
1 ONLINE ONLINE node2
ora.node3.vip
1 ONLINE ONLINE node3
ora.node4.vip
1 ONLINE ONLINE node4
ora.node5.vip
1 ONLINE ONLINE node5
ora.node6.vip
1 ONLINE ONLINE node6
ora.oadb.db
1 ONLINE ONLINE node6 Open
ora.oc4j
1 ONLINE ONLINE node3
ora.orcl.db
1 ONLINE ONLINE node5 Open
ora.scan1.vip
1 ONLINE ONLINE node2
ora.scan2.vip
1 ONLINE ONLINE node3
ora.scan3.vip
1 ONLINE ONLINE node1
2、asmcmd查看asm磁盘是否可以正常访问，确认asm正常：
[grid@node1 ~]$ asmcmd -p
ASMCMD [+] > ls
FLASH/
GRIDDG/
LTDG/
ORADG/
ASMCMD [+] > ls ltdg
ASMCMD [+] > cd oradg
ASMCMD [+oradg] > ls
EFMISDB/
FASPDB/
LTDB/
OADB/
ORCL/
ASMCMD [+oradg] > cd ltdb
ASMCMD [+oradg/ltdb] > ls
CONTROLFILE/
DATAFILE/
ONLINELOG/
PARAMETERFILE/
TEMPFILE/
spfileltdb.ora
ASMCMD [+oradg/ltdb] > cd datafile
ASMCMD [+oradg/ltdb/datafile] > ls
BSIP_JLPT.335.923932111
EFMIS.291.920050869
EFMIS.292.920050843
EFMIS.293.920050823
EFMIS.294.920050793
EFMIS.338.926285547
EFMIS.339.926285561
EFMIS_YS.327.922529787
EFMIS_YS.DBF
FASP2.290.920053427
FASP2.325.922112969
FASP2.326.922112977
FASP2.328.923068707
FASP2.329.923571833
FASP2.330.923571847
FASP2.340.926285581
FASP2TEST.334.923932089
SYSAUX.257.919523823
SYSTEM.256.919523823
UNDOTBS1.258.919523825
UNDOTBS2.264.919523987
USERS.259.919523825
ASMCMD [+oradg/ltdb/datafile] > exit
3、登录数据库，尝试启动数据库，此间打开alert日志：
[oracle@node1 ~]$ export ORACLE_SID=ltdb1
[oracle@node1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Tue Nov 1 12:32:15 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORA-00119: invalid specification for system parameter REMOTE_LISTENER
ORA-00132: syntax error or unresolved network name ‘lt-cluster:1521‘
SQL> exit
发现数据库启动报错119，查看以下alert日志发现进程kill因为119：
Tue Nov 01 12:32:18 2016
Starting ORACLE instance (normal)
************************ Large Pages Information *******************
Per process system memlock (soft) limit = 32 KB
Total Shared Global Region in Large Pages = 0 KB (0%)
Large Pages used by this instance: 0 (0 KB)
Large Pages unused system wide = 0 (0 KB)
Large Pages configured system wide = 0 (0 KB)
Large Page size = 2048 KB
RECOMMENDATION:
Total System Global Area size is 3010 MB. For optimal performance,
prior to the next instance restart:
1. Increase the number of unused large pages by
at least 1505 (page size 2048 KB, total size 3010 MB) system wide to
get 100% of the System Global Area allocated with large pages
2. Large pages are automatically locked into physical memory.
Increase the per process memlock (soft) limit to at least 3018 MB to lock
100% System Global Area‘s large pages into physical memory
********************************************************************
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Initial number of CPU is 4
Number of processor cores in the system is 4
Number of processor sockets in the system is 2
Private Interface ‘eth1:1‘ configured from GPnP for use as a private interconnect.
[name=‘eth1:1‘, type=1, ip=169.254.149.234, mac=00-50-56-80-52-8e, net=169.254.0.0/16, mask=255.255.0.0, use=haip:cluster_interconnect/62]
Public Interface ‘eth0‘ configured from GPnP for use as a public interface.
[name=‘eth0‘, type=1, ip=192.168.100.61, mac=00-50-56-80-2b-89, net=192.168.100.0/24, mask=255.255.255.0, use=public/1]
Public Interface ‘eth0:1‘ configured from GPnP for use as a public interface.
[name=‘eth0:1‘, type=1, ip=192.168.100.70, mac=00-50-56-80-2b-89, net=192.168.100.0/24, mask=255.255.255.0, use=public/1]
Public Interface ‘eth0:6‘ configured from GPnP for use as a public interface.
[name=‘eth0:6‘, type=1, ip=192.168.100.81, mac=00-50-56-80-2b-89, net=192.168.100.0/24, mask=255.255.255.0, use=public/1]
CELL communication is configured to use 0 interface(s):
CELL IP affinity details:
NUMA status: non-NUMA system
cellaffinity.ora status: N/A
CELL communication will use 1 IP group(s):
Grp 0:
Picked latch-free SCN scheme 3
Using LOG_ARCHIVE_DEST_1 parameter default value as USE_DB_RECOVERY_FILE_DEST
Autotune of undo retention is turned on.
LICENSE_MAX_USERS = 0
SYS auditing is disabled
Starting up:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options.
ORACLE_HOME = /u01/app/oracle/product/11.2.0.4/dbhome_1
System name: Linux
Node name: node1
Release: 2.6.18-308.el5
Version: #1 SMP Fri Jan 27 17:17:51 EST 2012
Machine: x86_64
VM name: VMWare Version: 6
Using parameter settings in server-side pfile /u01/app/oracle/product/11.2.0.4/dbhome_1/dbs/initltdb1.ora
System parameters with non-default values:
processes = 800
sessions = 1224
spfile = "+ORADG/ltdb/spfileltdb.ora"
sga_target = 3008M
control_files = "+ORADG/ltdb/controlfile/current.260.919523907"
control_files = "+FLASH/ltdb/controlfile/current.256.919523907"
db_block_size = 8192
compatible = "11.2.0.4.0"
cluster_database = TRUE
db_create_file_dest = "+ORADG"
db_recovery_file_dest = "+FLASH"
db_recovery_file_dest_size= 4407M
thread = 1
undo_tablespace = "UNDOTBS1"
_partition_large_extents = "FALSE"
_index_partition_large_extents= "FALSE"
instance_number = 1
remote_login_passwordfile= "EXCLUSIVE"
db_domain = ""
dispatchers = "(PROTOCOL=TCP) (SERVICE=ltdbXDB)"
remote_listener = "lt-cluster:1521"
audit_file_dest = "/u01/app/oracle/admin/ltdb/adump"
audit_trail = "DB"
db_name = "ltdb"
open_cursors = 300
pga_aggregate_target = 998M
diagnostic_dest = "/u01/app/oracle"
Cluster communication is configured to use the following interface(s) for this instance
169.254.149.234
cluster interconnect IPC version:Oracle UDP/IP (generic)
IPC Vendor 1 proto 2
Tue Nov 01 12:33:04 2016
USER (ospid: 31080): terminating the instance due to error 119
Instance terminated by USER, pid = 31080
4、目前为止可以看到GI集群启动正常，但是数据库无法打开，报错119，通过查看参数文件配置并未发现异常。通过nslookup检查scan ip解析情况，发现dns解析出现问题，查看dbs服务器，发现dns服务器并未启动。启动dns服务器后重启数据库服务器，发现可以正常打开数据库。
由于dns服务为启动导致的GI集群启动故障