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>sudo service nfs-kernel-server reload
nfs-server.service is not active, cannot reload.

>exportfs -ra
exportfs: could not open /var/lib/nfs/.etab.lock for locking: errno 13 (Permission denied)
exportfs: can't lock /var/lib/nfs/etab for writing

sudo service nfs-kernel-server start

>sudo service nfs-kernel-server start
Job for nfs-server.service canceled.

● nfs-server.service - NFS server and services
   Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
   Active: active (exited) since Thu 2017-11-30 13:53:46 CET; 5h 54min ago
  Process: 1063 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
  Process: 1061 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
 Main PID: 1063 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 4915)
   CGroup: /system.slice/nfs-server.service

Nov 30 13:53:46 cmstacker systemd[1]: Starting NFS server and services...
Nov 30 13:53:46 cmstacker systemd[1]: Started NFS server and services.

journalctl -xe

 <3994 10>sudo service nfs-kernel-server reload
[sudo] Passwort für marcus: 
Job for nfs-server.service failed because the control process exited with error code.
See "systemctl  status nfs-server.service" and "journalctl  -xe" for details.

● nfs-server.service - NFS server and services
   Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
   Active: active (exited) (Result: exit-code) since Thu 2017-11-30 13:53:46 CET; 6h ago
  Process: 15757 ExecReload=/usr/sbin/exportfs -r (code=exited, status=1/FAILURE)
  Process: 1063 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
  Process: 1061 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
 Main PID: 1063 (code=exited, status=0/SUCCESS)

Nov 30 13:53:46 cmstacker systemd[1]: Starting NFS server and services...
Nov 30 13:53:46 cmstacker systemd[1]: Started NFS server and services.
Nov 30 19:56:29 cmstacker systemd[1]: Reloading NFS server and services.
Nov 30 19:56:29 cmstacker exportfs[15757]: exportfs: /export/marcus does not support NFS export
Nov 30 19:56:29 cmstacker systemd[1]: ^[[0;1;39mnfs-server.service: Control process exited, code=exited status=1
Nov 30 19:56:29 cmstacker systemd[1]: Reload failed for NFS server and services.

Nov 30 19:47:47 cmstacker gnome-shell[1664]: ^[[0;1;39m_st_paint_shadow_with_opacity: assertion 'shadow_pipeline != NULL' failed
Nov 30 19:47:48 cmstacker gnome-shell[1664]: ^[[0;1;39m_st_paint_shadow_with_opacity: assertion 'shadow_pipeline != NULL' failed
Nov 30 19:47:52 cmstacker ntpdate[15581]: ^[[0;1;39madjust time server 91.189.89.198 offset 0.000312 sec
Nov 30 19:47:57 cmstacker org.gnome.Shell.desktop[3461]: ^[[0;1;39mWindow manager warning: Overwriting existing binding of keysym ffb5 with keysym ffb5 (keycode 54).
Nov 30 19:55:01 cmstacker CRON[15723]: pam_unix(cron:session): session opened for user root by (uid=0)
Nov 30 19:55:01 cmstacker CRON[15724]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Nov 30 19:55:01 cmstacker CRON[15723]: pam_unix(cron:session): session closed for user root
Nov 30 19:55:54 cmstacker systemd-timesyncd[728]: Timed out waiting for reply from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Nov 30 19:55:54 cmstacker systemd-timesyncd[728]: Synchronized to time server [2001:67c:1560:8003::c7]:123 (ntp.ubuntu.com).
Nov 30 19:56:14 cmstacker smartd[895]: Device: /dev/sda [SAT], SMART Usage Attribute: 190 Airflow_Temperature_Cel changed from 77 to 79
Nov 30 19:56:14 cmstacker smartd[895]: Device: /dev/sdb [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 121 to 125
Nov 30 19:56:14 cmstacker smartd[895]: Device: /dev/sdc [SAT], is back in ACTIVE or IDLE mode, resuming checks (5 checks skipped)
Nov 30 19:56:14 cmstacker smartd[895]: Device: /dev/sdc [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 130 to 124
Nov 30 19:56:29 cmstacker sudo[15749]: pam_ecryptfs: pam_sm_authenticate: /home/marcus is already mounted
Nov 30 19:56:29 cmstacker sudo[15749]: ^[[0;1;39m  marcus : TTY=pts/1 ; PWD=/home/marcus ; USER=root ; COMMAND=/usr/sbin/service nfs-kernel-server reload
Nov 30 19:56:29 cmstacker sudo[15749]: pam_unix(sudo:session): session opened for user root by (uid=0)
Nov 30 19:56:29 cmstacker systemd[1]: Reloading NFS server and services.
-- Subject: Unit nfs-server.service has begun reloading its configuration
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit nfs-server.service has begun reloading its configuration
Nov 30 19:56:29 cmstacker exportfs[15757]: exportfs: /export/marcus does not support NFS export
Nov 30 19:56:29 cmstacker systemd[1]: ^[[0;1;39mnfs-server.service: Control process exited, code=exited status=1
Nov 30 19:56:29 cmstacker systemd[1]: Reload failed for NFS server and services.
-- Subject: Unit nfs-server.service has finished reloading its configuration
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit nfs-server.service has finished reloading its configuration
--
-- The result is failed.
Nov 30 19:56:29 cmstacker sudo[15749]: pam_unix(sudo:session): session closed for user root
Nov 30 19:57:17 cmstacker systemd[1]: Starting Daily apt download activities...
-- Subject: Unit apt-daily.service has begun start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit apt-daily.service has begun starting up.
Nov 30 19:57:18 cmstacker systemd[1]: Started Daily apt download activities.
-- Subject: Unit apt-daily.service has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit apt-daily.service has finished starting up.
--
-- The start-up result is done.

Nov 30 19:56:29 cmstacker exportfs[15757]: exportfs: /export/marcus does not support NFS export

20:07:29 (bash4.4.12) marcus@cmstacker:/export$
 <3999 16>ls -l
insgesamt 40
drwxr-xr-x+ 97 marcus marcus 32768 Nov 30 14:21 marcus
drwxr-xr-x   3 root   root    4096 Apr  6  2013 media

cat /etc/fstab
...
#NFSv4 mounts
/home/marcus    /export/marcus   none    bind  0  0
/media/DATA_01    /export/media/DATA_01   none    bind  0  0
...

21:00:44 (bash4.4.12) marcus@cmstacker:/$
 <4024 41>ls -l
insgesamt 522516
-rw-r--r--   1 root root 121834171 Jul 13  2014 backup
drwxr-xr-x   2 root root     12288 Okt 27 16:32 bin
drwxr-xr-x   3 root root      4096 Nov 22 04:16 boot
drwxr-xr-x   2 root root      4096 Apr 23  2014 cdrom
-rw-------   1 root root 413081600 Mär 20  2016 core
drwxr-xr-x  19 root root      4360 Nov 30 20:39 dev
drwxr-xr-x 208 root root     16384 Nov 30 15:14 etc
drwxr-xr-x   4 root root      4096 Apr  6  2013 export
drwxr-xr-x   5 root root      4096 Jan 22  2017 home
...

cat /etc/exports
# /etc/exports: the access control list for filesystems which may be exported
#		to NFS clients.  See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes       hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4        gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes  gss/krb5i(rw,sync,no_subtree_check)
#

# Exportieren der freigegebenen Verzeichnisse ins locale Netz 192.168.1.0/24
# Benötigt zur optimalen Funktion eine Freigabe mit der Option fsid=0.
# Diese wird als root-Freigabe genutzt und ist als die Freigabe / zu
# erreichen. Die anderen Freigaben liegen unterhalb davon. Ansonsten 
# ist optional eine Authentifizierung/Verschlüsselung mit Kerberos möglich


/export        T60p(rw,fsid=0,no_subtree_check,sync) silverstone(rw,fsid=0,no_subtree_check,sync)
# /export       192.168.2.0/24(rw,fsid=0,no_subtree_check,sync)
# Test mit root_squash:
# /export       192.168.2.0/25(rw,fsid=0,no_subtree_check,async,root_squash)

# DATA_01
/export/media/DATA_01 T60p(rw,nohide,insecure,no_subtree_check,async)
# /export/media/DATA_01 silverstone(rw,nohide,insecure,no_subtree_check,async)
# /export/media/DATA_01 192.168.2.100/24(rw,nohide,insecure,no_subtree_check,sync)

# marcus
/export/marcus T60p(rw,nohide,insecure,no_subtree_check,async)
# /export/marcus silverstone(rw,nohide,insecure,no_subtree_check,async)
# /export/marcus 192.168.2.100/24(rw,nohide,insecure,no_subtree_check,sync)
# /export/marcus/.local 192.168.2.102(rw,nohide,insecure,no_subtree_check,sync)
# /export/marcus/.local/share 192.168.2.102(rw,nohide,insecure,no_subtree_check,sync)
# /export/marcus/.local/share/rhythmbox 192.168.2.102(rw,nohide,insecure,no_subtree_check,sync)

# /srv/nfsv4   192.168.2.0/24(rw,sync,root_squash,no_subtree_check,fsid=0)
# /srv/nfsv4/freigabe1  192.168.2.0/24(rw,sync,root_squash,no_subtree_check)