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[SOLVED] Diskless client can't mount NFS root, liveCD can

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dusanc
Apprentice

Joined: 19 Sep 2005
Posts: 248
Location: Serbia

Posted: Sat Jan 06, 2018 6:30 pm Post subject: [SOLVED] Diskless client can't mount NFS root, liveCD can

Hello,

I'm trying to bring up some diskless gentoo clients.
Setup I'm using is: dnsmasq DHCP/TFTP/DNS server and PXELINUX as bootloader.
On boot clients get IP adresses, recieve kernel and kernel options from server and start booting kernel but they stop with:

Code:

VFS: Unable to mount root fs via NFS.
List of all partitions:
No filesystems couldmount root, tried:
nfs

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

If I try to mount that NFS share from that same client when it's running from livecd it works.
I used NFSv3, without any firewall rules.

I have no more ideas.

TIA

Dusan

Code:

krshina3 /home/dusan # tcpdump -vv -i br0 | grep 168.1.101
.....
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe69!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe68!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe67!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe66!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe65!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe64!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe63!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe62!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe61!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe60!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe5f!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe5e!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe5d!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe5c!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe5b!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x8956 -> 0xfe5a!] UDP, length 1412
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
192.168.1.3.41418 > 192.168.1.101.49164: [bad udp cksum 0x87a6 -> 0x2cf5!] UDP, length 980
192.168.1.101.49164 > 192.168.1.3.41418: [udp sum ok] UDP, length 4
19:25:35.318485 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.1.101 tell 192.168.1.3, length 28
19:25:36.342503 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.1.101 tell 192.168.1.3, length 28
192.168.1.3.bootps > 192.168.1.101.bootpc: [bad udp cksum 0x84fe -> 0x446f!] BOOTP/DHCP, Reply, length 300, xid 0x1d19cab3, Flags [none] (0x0000)
Your-IP 192.168.1.101
Requested-IP Option 50, length 4: 192.168.1.101
192.168.1.3.bootps > 192.168.1.101.bootpc: [bad udp cksum 0x84fe -> 0x416f!] BOOTP/DHCP, Reply, length 300, xid 0x1d19cab3, Flags [none] (0x0000)
Your-IP 192.168.1.101
19:25:41.462490 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.1.101 tell 192.168.1.3, length 28
19:25:41.462698 ARP, Ethernet (len 6), IPv4 (len 4), Reply 192.168.1.101 is-at 00:15:b7:7f:89:6b (oui Unknown), length 46

Code:

krshina3 /home/dusan # rpcdebug -m rpc -s all
krshina3 /home/dusan # rpcdebug -m nfsd -s all
krshina3 /home/dusan # tail -f -n 100 /var/log/messages

Jan 6 18:51:19 krshina3 dnsmasq-dhcp[3896]: DHCPDISCOVER(br0) 00:15:b7:7f:89:6b
Jan 6 18:51:19 krshina3 dnsmasq-dhcp[3896]: DHCPOFFER(br0) 192.168.1.101 00:15:b7:7f:89:6b
Jan 6 18:51:21 krshina3 dnsmasq-dhcp[3896]: DHCPREQUEST(br0) 192.168.1.101 00:15:b7:7f:89:6b
Jan 6 18:51:21 krshina3 dnsmasq-dhcp[3896]: DHCPACK(br0) 192.168.1.101 00:15:b7:7f:89:6b miner1
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: error 0 TFTP Aborted received from 192.168.1.101
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: failed sending /diskless/shared/pxelinux.0 to 192.168.1.101
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: sent /diskless/shared/pxelinux.0 to 192.168.1.101
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: sent /diskless/shared/ldlinux.c32 to 192.168.1.101
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/3437d000-5648-16c1-8011-b70257822197 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/01-00-15-b7-7f-89-6b not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0A80165 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0A8016 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0A801 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0A80 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0A8 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0A not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C0 not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: file /diskless/shared/pxelinux.cfg/C not found
Jan 6 18:51:21 krshina3 dnsmasq-tftp[3896]: sent /diskless/shared/pxelinux.cfg/default to 192.168.1.101
Jan 6 18:51:23 krshina3 dnsmasq-tftp[3896]: sent /diskless/shared//bzImage to 192.168.1.101
Jan 6 18:51:27 krshina3 dnsmasq-dhcp[3896]: DHCPDISCOVER(br0) 00:15:b7:7f:89:6b
Jan 6 18:51:27 krshina3 dnsmasq-dhcp[3896]: DHCPOFFER(br0) 192.168.1.101 00:15:b7:7f:89:6b
Jan 6 18:51:27 krshina3 dnsmasq-dhcp[3896]: DHCPREQUEST(br0) 192.168.1.101 00:15:b7:7f:89:6b
Jan 6 18:51:27 krshina3 dnsmasq-dhcp[3896]: DHCPACK(br0) 192.168.1.101 00:15:b7:7f:89:6b miner1
Jan 6 18:51:58 krshina3 kernel: NFSD: laundromat service - starting
Jan 6 18:51:58 krshina3 kernel: NFSD: laundromat_main - sleeping for 90 seconds

Code:

krshina3 /home/dusan # cat /etc/dnsmasq.conf
# Listen only to this interface
interface=br0

# Assign names based on mac address
dhcp-host=68:07:15:48:5A:AD,192.168.1.10,24h

#Miners
dhcp-host=00:15:b7:7f:89:6b,miner1,192.168.1.101,24h
dhcp-host=54:ee:75:aa:21:74,miner2,192.168.1.102,24h
#dhcp-option=option:root-path,192.168.1.3:/diskless/shared

# Any other DHCP request gets an ip from this range
dhcp-range=192.168.1.201,192.168.1.250,24h

# Enable the TFTP server and set the root directory for files available via TFTP.
enable-tftp
tftp-root=/diskless/shared
dhcp-boot=/pxelinux.0

Code:

krshina3 /home/dusan # cat /diskless/shared/pxelinux.cfg/default
DEFAULT gentoo
LABEL gentoo
LINUX /bzImage
APPEND ip=dhcp root=/dev/nfs rootfstype=nfs nfsroot=192.168.1.3:/diskless/shared loglevel=7 raid=noautodetect noinitrd rw

Code:

krshina3 /home/dusan # cat /etc/conf.d/nfs | grep -v '#'

NFS_NEEDED_SERVICES="rpc.idmapd"
OPTS_RPC_NFSD="8 -V 3 -N 4 -N 4.1"
OPTS_RPC_MOUNTD=""
OPTS_RPC_STATD=""
OPTS_RPC_IDMAPD=""
OPTS_RPC_GSSD=""
OPTS_RPC_SVCGSSD=""
OPTS_RPC_RQUOTAD=""
EXPORTFS_TIMEOUT=30

Code:

krshina3 /home/dusan # cat /etc/exports|grep -v '#'
/diskless/shared *(sync,rw,no_root_squash,no_all_squash,fsid=0,no_subtree_check)

Code:

krshina3 /home/dusan # cat /usr/src/linux/.config | grep NFS
CONFIG_KERNFS=y
CONFIG_NFS_FS=y
# CONFIG_NFS_V2 is not set
CONFIG_NFS_V3=y
# CONFIG_NFS_V3_ACL is not set
# CONFIG_NFS_V4 is not set
# CONFIG_NFS_SWAP is not set
CONFIG_ROOT_NFS=y
CONFIG_NFS_DEBUG=y
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
# CONFIG_NFSD_V3_ACL is not set
# CONFIG_NFSD_V4 is not set
CONFIG_NFS_COMMON=y

_________________
Reiser4 Gentoo FAQ [25Dec2016]

Last edited by dusanc on Sat Jan 06, 2018 9:12 pm; edited 1 time in total

krinn
Watchman

Joined: 02 May 2003
Posts: 7470

Posted: Sat Jan 06, 2018 7:57 pm Post subject:

try that: https://forums.gentoo.org/viewtopic-p-7592928.html#7592928

dusanc
Apprentice

Joined: 19 Sep 2005
Posts: 248
Location: Serbia

Posted: Sat Jan 06, 2018 8:30 pm Post subject:

I recompiled server and client kernel to have only NFSv3 and used nfsvers=3 but still nothing. Looking at wireshark and tscpdump outputs I think that for some reason client doesn't send any packet to server after getting the IP adress from DHCP. _________________ Reiser4 Gentoo FAQ [25Dec2016]

NeddySeagoon
Administrator

Joined: 05 Jul 2003
Posts: 54596
Location: 56N 3W

Posted: Sat Jan 06, 2018 8:54 pm Post subject:

dusanc, Well, the server works, or the liveCD wouldn't work either. Pastebin the client kernel .config and the init script from the client initrd, if you have a client initrd. _________________ Regards, NeddySeagoon Computer users fall into two groups:- those that do backups those that have never had a hard drive fail.

dusanc
Apprentice

Joined: 19 Sep 2005
Posts: 248
Location: Serbia

Posted: Sat Jan 06, 2018 8:57 pm Post subject:

NeddySeagoon wrote:

dusanc,

Well the server works, or the liveCD wouldn't work either.

Pastebin the client kernel .config and the init script from the client initrd, if you have a client initrd.

There's no initrd, kernels are monolithic.

.config is here https://paste.pound-python.org/show/afx0V9fktQXvUOnF4uju/
_________________
Reiser4 Gentoo FAQ [25Dec2016]

krinn
Watchman

Joined: 02 May 2003
Posts: 7470

Posted: Sat Jan 06, 2018 9:02 pm Post subject:

dusanc wrote:

I recompiled server and client kernel to have only NFSv3 and used nfsvers=3 but still nothing.

Looking at wireshark and tscpdump outputs I think that for some reason client doesn't send any packet to server after getting the IP adress from DHCP.

you read it bad, the key is vers=3
nfsvers=3 wasn't the key to success

and the problem is not because the client use an nfsv3 implementation, but because the server try all implementations it knows if the client don't tell him "i'm using a version x", hence the fix with vers=3 -> the client is telling the server, try with nfsv3 on me first.

dusanc
Apprentice

Joined: 19 Sep 2005
Posts: 248
Location: Serbia

Posted: Sat Jan 06, 2018 9:10 pm Post subject:

krinn wrote:

dusanc wrote:

you read it bad, the key is vers=3
nfsvers=3 wasn't the key to success

And we have a winner!

Solution, as said above is to add vers=3:

Code:

nfsroot=$SERVERIP:/diskless/shared,vers=3

Now clients booted.

2nd question: Is it possible to use NFSv3 just for boot and NFSv4 for remounting / ?
_________________
Reiser4 Gentoo FAQ [25Dec2016]

krinn
Watchman

Joined: 02 May 2003
Posts: 7470

Posted: Sat Jan 06, 2018 9:28 pm Post subject:

dusanc wrote:

2nd question: Is it possible to use NFSv3 just for boot and NFSv4 for remounting / ?

the subtle to mount a v4 or v3 share is on the client asking the mount.

Look at (a proper v4 share)

Code:

/export 192.168.0.0/24(rw,sec=sys,fsid=0,no_root_squash,no_subtree_check,nohide,async,anonuid=250,anongid=250)
/export/distfiles 192.168.0.0/24(rw,no_subtree_check,async,no_root_squash,nohide,secure,anonuid=250,anongid=250)

and how client mount this:
mount it as nfsv3: mount server:/export/distfiles ...
mount it as nvsv4: mount server:/distfiles ...
for nfvs4 first directory is the nfs_root, which mean its base, so / because it's /export in my example, export is so / it must have the entry fsid=0 to tag it /
and if you mount /distfiles you then mount it "as an nfsv4" client, because you aim the directory "/" + "distfiles"
and if you mount /export/distfiles you mount it "as nfsv3" client, because there's no "root" concept on v3
keep that in mind, because if you try force nfsv4 with mount /export/distfiles, it will fail because you are saying let me mount "/" + "export" + "distilfes", which mean /export/export/distfiles in the example.

keep also in mind: all directories must be subdir of / for nfsv4.
so you cannot do
/export ...
/export/distfiles
/var/tmp <- wrong, not subdir of /export.
if you have different directories to mount, you bind them to your nfs_root mount point.
to allow /var/tmp you mount --bind /var/tmp /export/var_tmp
and its entry in the config is set as:
/export/var_tmp ... var_tmp is a subdir of /export, nfsv4 server is now happy

make sure your nfsv4 server is configure correctly, and your nfsv4 or 3 clients will be happy.
but if you mess with the nfsv4 server config, nfsv4 clients will not (while still nfsv3 will remain happy).

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