The strange inexistent FQDNs in the bpdbm.logs

Question

Enviroment: NBU 8.1.1 on RHEL 6.9Symptom:1) There are many hostname resolution entries about the vnet_cached_getaddrinfo with their inexistent FQDNs in the bpdbm.logs:Notes: They are the host short-names used by the master/media server in the bp.conf, those are also resolved via the /etc/hosts.20:30:23.383 [753] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db4.sh.sgcc.com.cn SVC=NULL20:30:32.866 [944] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db4.sh.sgcc.com.cn SVC=NULL20:30:35.731 [978] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb2.sh.sgcc.com.cn SVC=NULL20:30:43.873 [1067] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db4.sh.sgcc.com.cn SVC=NULL20:30:47.148 [1094] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb2.sh.sgcc.com.cn SVC=NULL20:31:00.222 [1228] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb4.sh.sgcc.com.cn SVC=NULL20:31:06.028 [1323] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db2.sh.sgcc.com.cn SVC=NULL20:31:12.725 [1427] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb4.sh.sgcc.com.cn SVC=NULL20:31:21.955 [1532] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb2.sh.sgcc.com.cn SVC=NULL20:31:23.532 [1548] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb2.sh.sgcc.com.cn SVC=NULL20:31:23.944 [1559] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db2.sh.sgcc.com.cn SVC=NULL20:31:39.127 [1652] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db2.sh.sgcc.com.cn SVC=NULL20:31:51.366 [1696] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=sh2db2.sh.sgcc.com.cn SVC=NULL20:33:20.655 [2047] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=gw2db1.sh.sgcc.com.cn SVC=NULL20:33:25.077 [2093] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=gw2db1.sh.sgcc.com.cn SVC=NULL20:33:42.105 [2161] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=shzycdb1.sh.sgcc.com.cn SVC=NULL20:33:45.389 [2175] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=gw2db1.sh.sgcc.com.cn SVC=NULL20:33:59.405 [2236] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=jcsjdb3.sh.sgcc.com.cn SVC=NULL20:34:00.868 [2253] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=jcsjdb3.sh.sgcc.com.cn SVC=NULLSERVER = jcbak &lt;--- master serverMEDIA_SERVER = jcsjdw1MEDIA_SERVER = jcsjdb2MEDIA_SERVER = jcsjdb3MEDIA_SERVER = sh2db1MEDIA_SERVER = sh2db2MEDIA_SERVER = sh2db3MEDIA_SERVER = sh2db4MEDIA_SERVER = sh2db5MEDIA_SERVER = gmdfwq1MEDIA_SERVER = gmdfwq2MEDIA_SERVER = gmdfwq3MEDIA_SERVER = shzycdb1MEDIA_SERVER = shzycdb2MEDIA_SERVER = gw3db3MEDIA_SERVER = gw3db4MEDIA_SERVER = ecmweb1MEDIA_SERVER = gw3db1MEDIA_SERVER = gw3db2## nbemmcmd -listhosts -verbose -display_server -machinename jcbak -machinetype masterNBEMMCMD, Version: 8.1.1jcbakClusterName = ""MachineName = "jcbak"FQName = "jcbak"GlobalDriveSeed = "VEND:#.:PROD:#.:IDX"LocalDriveSeed = ""MachineDescription = ""MachineFlags = 0x77MachineNbuType = master (3)MachineState = active for tape and disk jobs (14)NetBackupVersion = 8.1.1.0 (811000)OperatingSystem = linux (16)ScanAbility = 5Command completed successfully.#### nbemmcmd -listhosts -verbose -display_server -machinename jcsjdb3 -machinetype mediaNBEMMCMD, Version: 8.1.1jcsjdb3ClusterName = ""MachineName = "jcsjdb3"FQName = "jcsjdb3"LocalDriveSeed = ""MachineDescription = ""MachineFlags = 0x71MachineNbuType = media (1)MachineState = active for tape and disk jobs (14)MasterServerName = "jcbak"NetBackupVersion = 8.1.1.0 (811000)OperatingSystem = linux (16)ScanAbility = 5Command completed successfully.#### grep -Ei "jcbak|sjdb3" /etc/hosts10.131.33.60 jcbak10.131.29.105 jcsjdb3##2) There are also some hostname resolution entries about the vnet_cached_getaddrinfo with their short-names in the bpdbm.logs:Notes: Those short hostname are also resolved via the /etc/hosts, and appear normally in the bpdbm.logs:20:30:20.145 [710] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=srmprd2 SVC=NULL20:30:20.146 [710] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=srmprd1 SVC=NULL20:30:20.146 [710] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=erp-audit SVC=NULL20:30:20.156 [710] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=SCERPDB1 SVC=NULL20:30:20.157 [710] &lt;8&gt; vnet_cached_getaddrinfo_and_update: [vnet_addrinfo.c:1751] in failed file cache ERR=-2 NAME=EDWETL SVC=NULLMEDIA_SERVER = srmprd1MEDIA_SERVER = srmprd2MEDIA_SERVER = scerpdb1### nbemmcmd -listhosts -verbose -display_server -machinename srmprd2 -machinetype mediaNBEMMCMD, Version: 8.1.1srmprd2ClusterName = ""MachineName = "srmprd2"FQName = "srmprd2"LocalDriveSeed = ""MachineDescription = ""MachineFlags = 0x13MachineNbuType = media (1)MachineState = not reachable by master (4)MasterServerName = "jcbak"NetBackupVersion = 8.1.1.0 (811000)OperatingSystem = rs6000 (5)ScanAbility = 5Command completed successfully.#### nbemmcmd -listhosts -verbose -display_server -machinename scerpdb1 -machinetype mediaNBEMMCMD, Version: 8.1.1SCERPDB1ClusterName = ""MachineName = "SCERPDB1"FQName = "SCERPDB1"LocalDriveSeed = ""MachineDescription = ""MachineFlags = 0x17MachineNbuType = media (1)MachineState = not active (0)MasterServerName = "jcbak"NetBackupVersion = 7.5.0.0 (750000)OperatingSystem = rs6000 (5)ScanAbility = 5Command completed successfully.###

stoneram-simon · Answer

If you do not restrict the OS to just use the hosts file as per&nbsp;jnardello
I would also suggest that you check&nbsp;what you have in your /etc/resolv.conf too, as you may have additional "search domains" specified which then get added to the short name when the OS is resolving a name, and this is what NBU would then see...
In many cases the contents of the resolv.conf is managed by other network configuration settings / tools if so you need to identify where the "search domains" are being set and update them at the source or they will keep coming back...
&nbsp;
&nbsp;

davidmoline · Answer

Hi&nbsp;liuyl&nbsp;
So? What's the problem?&nbsp;
In relation to name resolution - what does nsswitch.conf dictate as the order for name lookups (hint if files isn't first in the list then DNS will be used)?
What's the output of the command "getent hosts 10.131.29.105" - which you expect to return jcsjdb3?
Have you tried clearing the NetBackup host cache on the server (bpclntcmd -clear_host_cache)?
CheersDavid

liuyl · Answer

### getent hosts 10.131.29.10510.131.29.105 jcsjdb3##Question:&nbsp; So where and why the corresponding inexistent FQDNs in the bpdbm.logs come from ？Yes, I do the clear_host_cache.&nbsp;

davidmoline · Answer

Can you answer my first question - what is the problem you are trying to resolve?

liuyl · Answer

My final demand is the following:How to enforce the netbackup just only use /etc/hosts for its hostname resolution within the netbackup layer？

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The strange inexistent FQDNs in the bpdbm.logs

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