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rpc mount export: RPC: Unable to receive; errno = Connection refused

For the below errors: [root@psql02 log]# showmount -e nfs02 rpc mount export: RPC: Unable to receive; errno = Connection refused [root@psql02 log]# Apr 16 01:12:37 nfs02 kernel: FINAL_REJECT: IN=eth0 OUT= MAC=00:50:56:86:2d:21:00:50:56:86:3c:c7:08:00 SRC=192.168.0.124 DST=192.168.0.119 LEN=60 TOS=0×00 PREC=0×00 TTL=64 ID=44729 DF PROTO=TCP SPT=978 DPT=20048 WINDOW=29200 RES=0×00 SYN URGP=0 [root@nfs02 log]# [root@nfs02 log]# [root@nfs02 log]# [root@nfs02 log]# firewall-cmd [...]

psql: error while loading shared libraries: libpq.so.rh-postgresql95-5: cannot open shared object file: No such file or directory

Well heck: -bash-4.2$ psql psql: error while loading shared libraries: libpq.so.rh-postgresql95-5: cannot open shared object file: No such file or directory -bash-4.2$ So let's see what's going on: [root@ovirt01 ~]# find / -iname libpq.so* /usr/lib64/libpq.so.5 /usr/lib64/libpq.so.5.5 /opt/rh/rh-postgresql95/root/usr/lib64/libpq.so.rh-postgresql95-5 /opt/rh/rh-postgresql95/root/usr/lib64/libpq.so.rh-postgresql95-5.8 [root@ovirt01 ~]# So we can see it's in the lib64 path.  And within the root postgres folder, [...]

NFS reply xid reply ERR 20: Auth Invalid failure code 13 and AD logins become hung when using NFS home directories.

You get the following error message: 15:27:35.430633 IP 192.168.0.80.nfs > 192.168.0.145.843: Flags [P.], seq 29:53, ack 417, win 235, options [nop,nop,TS val 6635947 ecr 5159126], length 24: NFS reply xid 2938911306 reply ERR 20: Auth Invalid failure code 13 Checking the nfs01 / nfs02 server we see alot of the following: [2018-04-08 17:19:39.014330] E [MSGID: [...]

/usr/bin/ganesha.nfsd: /lib64/libntirpc.so.1.6: version `NTIRPC_1.6.1′ not found (required by /usr/bin/ganesha.nfsd)

What to do when you get this message below: [root@nfs01 ganesha]# systemctl status nfs-ganesha -l â nfs-ganesha.service – NFS-Ganesha file server    Loaded: loaded (/usr/lib/systemd/system/nfs-ganesha.service; enabled; vendor preset: disabled)    Active: failed (Result: exit-code) since Sun 2018-04-08 13:22:32 EDT; 1min 8s ago      Docs: http://github.com/nfs-ganesha/nfs-ganesha/wiki   Process: 2033 ExecStart=/bin/bash -c ${NUMACTL} ${NUMAOPTS} /usr/bin/ganesha.nfsd ${OPTIONS} [...]

kernel: NFS: nfs4_discover_server_trunking unhandled error -512. Exiting with error EIO and mount hangs

Mount still hangs and restarting NFS and autofs doesn't work to resolve this error below: Apr  8 12:12:46 ovirt01 systemd: Stopping Automounts filesystems on demand… Apr  8 12:12:46 ovirt01 kernel: NFS: nfs4_discover_server_trunking unhandled error -512. Exiting with error EIO Apr  8 12:12:47 ovirt01 automount[1487]: umount_autofs_indirect: ask umount returned busy /n Apr  8 12:12:48 ovirt01 ovsdb-server: [...]

command ConnectStoragePoolVDS failed: Cannot find master domain:

So we receive the following error from oVirt: VDSM mdskvm-p01.mds.xyz command ConnectStoragePoolVDS failed: Cannot find master domain: u'spUUID=87ec67c6-8da8-4161-afdf-180778a4b595, msdUUID=73fa156c-f085-466f-b409-130a9795a667' and dig in a bit deeper to see what's going on: [root@mdskvm-p01 log]# systemctl status vdsmd.service â vdsmd.service – Virtual Desktop Server Manager    Loaded: loaded (/usr/lib/systemd/system/vdsmd.service; enabled; vendor preset: enabled)    Active: active (running) since [...]

missing icmp_seq numbers

In case you see these missing icmp_seq numbers: [root@mdskvm-p01 ~]# ping 192.168.0.149 PING 192.168.0.149 (192.168.0.149) 56(84) bytes of data. 64 bytes from 192.168.0.149: icmp_seq=1 ttl=64 time=0.536 ms 64 bytes from 192.168.0.149: icmp_seq=3 ttl=64 time=0.240 ms 64 bytes from 192.168.0.149: icmp_seq=7 ttl=64 time=0.330 ms 64 bytes from 192.168.0.149: icmp_seq=11 ttl=64 time=0.331 ms 64 bytes from 192.168.0.149: [...]

Extending the size of your mdadm array.

Extending the size of your mdadm array.  Now that you've replaced all the failed disks, we can double the size of our array to 8TB from 4TB. We start off with this array: [root@mbpc-pc log]# mdadm –detail /dev/md0 /dev/md0:         Version : 1.2   Creation Time : Mon Mar 26 00:06:24 2012 [...]

pam_reply called with result [4]: System error.

So you're trying to login and get these messages on ovirt01 (192.168.0.145) and ipaclient01 (192.168.0.236).  What could be wrong:  (Thu Mar 22 23:59:26 2018) [sssd[be[nix.mds.xyz]]] [ldb] (0×4000): cancel ldb transaction (nesting: 2) (Thu Mar 22 23:59:26 2018) [sssd[be[nix.mds.xyz]]] [sysdb_mod_group_member] (0×0080): ldb_modify failed: [No such object](32)[ldb_wait from ldb_modify with LDB_WAIT_ALL: No such object (32)] (Thu Mar [...]

Windows 7 Cannot Resolve hostnames via PING but nslookup works.

It may happen that you can't ping a hostname either internally on a local DNS you may be running or externally.   Flushing the DNS cache may not work either: C:\Users\tom>ipconfig /flushdns Windows IP Configuration Successfully flushed the DNS Resolver Cache. C:\Users\tom>ping vcsa01 Ping request could not find host vcsa01. Please check the name and try [...]


     
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