solved [rootfs=nfs] nfs: server x.x.x.x not responding, still trying

Schwemmlandebene · June 11, 2016

Hallo,

with EXTENDED_DEBOOTSTRAP="yes" and ROOTFS_TYPE="nfs"my bananapim2 (jessie, next) has its / on /dev/nfs.

After a few minutes it hangs with the error message:

nfs: server x.x.x.x not responding, still trying

To extend the timeout period I add timeo=30 (3 seconds) to nfs-boot.cmd. The result is:

ubuntu:~# grep timeo userpatches/nfs-boot.cmd
setenv bootargs "console=tty1 console=ttyS0,115200 root=/dev/nfs ${net_setup} rw rootflags=noatime,nodiratime,timeo=30 disp.screen0_output_mode=1920x1080p60 panic=10 consoleblank=0 enforcing=0 loglevel=6"

# Banana Pi M2

root@m2-bare:~# journalctl --no-pager | grep nfs
Jun 10 23:17:01 m2-bare kernel: Kernel command line: console=tty1 console=ttyS0,115200 root=/dev/nfs ip=dhcp rw rootflags=noatime,nodiratime,timeo=30 disp.screen0_output_mode=1920x1080p60 panic=10 consoleblank=0 enforcing=0 loglevel=6
Jun 10 23:17:01 m2-bare kernel: nfs4filelayout_init: NFSv4 File Layout Driver Registering... 

root@m2-bare:~# mount | grep nfs
x.x.x.x:/srv/nfs/root on / type nfs (rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,nolock,proto=tcp,port=2049,timeo=7,retrans=10,sec=sys,local_lock=all,addr=x.x.x.x)

Unfortunately / is mounted with timeo=7.

Adding the timeo option to /etc/fstab brings no success, too. The mount command still shows timeo=7.

I guessed /etc/fstab is ignored totally. But that is wrong. Changing the first column "/dev/nfs" to something like "x.x.x.x:/srv/nfs/testroot" will be recognized.

How could / be mounted with additional options like a greater timeout period?

Schwemmlandebene · June 12, 2016

The DHCP configuration causes the problem.

Solution 1: Make a change in /etc/network/interfaces to:

iface eth0 inet manual

Solution 2: If you want to send some settings via DHCP keep the original setting in /etc/network/interfaces

iface eth0 inet dhcp

and set the lease times in /etc/dhcp/dhcpd.conf to infinity. Infinity means a few years. Have a look at /var/lib/dhcp/dhclient.eth0.leases on the client.

default-lease-time -1;
max-lease-time -1;

Check for typos and restart dhcpd.

user:$ sudo dhcpd -t -cf /etc/dhcp/dhcpd.conf
Internet Systems Consortium DHCP Server 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Config file: /etc/dhcp/dhcpd.conf
Database file: /var/lib/dhcp/dhcpd.leases
PID file: /var/run/dhcpd.pid

user:$ sudo systemctl restart isc-dhcp-server.service

For some reason my client gets the DHCP ntp-server option but ntpd ignores it. Would be great, if someone has a hint.

IHMO a line starting with /dev/nfs in /etc/fstab is an error and ignored because it doesn't fit the [host:dir] scheme.

/dev/nfs / nfs defaults 0 0

root@m2-bare:~# journalctl --no-pager | grep mount
Jun 12 10:05:49 m2-bare systemd[1]: Starting Arbitrary Executable File Formats File System Automount Point.
Jun 12 10:05:49 m2-bare systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
Jun 12 10:05:53 m2-bare systemd[1]: Starting Remount Root and Kernel File Systems...
Jun 12 10:05:53 m2-bare systemd-remount-fs[330]: mount.nfs: remote share not in 'host:dir' format
Jun 12 10:05:53 m2-bare systemd-remount-fs[330]: /bin/mount for / exited with exit status 32.
Jun 12 10:05:53 m2-bare systemd[1]: systemd-remount-fs.service: main process exited, code=exited, status=1/FAILURE
Jun 12 10:05:53 m2-bare systemd[1]: Failed to start Remount Root and Kernel File Systems.
Jun 12 10:05:53 m2-bare systemd[1]: Unit systemd-remount-fs.service entered failed state.
Jun 12 10:05:54 m2-bare kernel: EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: commit=600,errors=remount-ro

The thread could be marked as solved and the topic to be changed to:

[rootfs=nfs] nfs: server x.x.x.x not responding, still trying