RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

Question

I am trying to mount hdfs on my local machine(ubuntu) using nfs by following the below link:--

https://www.cloudera.com/documentation/enterprise/5-2-x/topics/cdh_ig_nfsv3_gateway_configure.html#xd_583c10bfdbd326ba--6eed2fb8-14349d04bee--7ef4

So,at my machine I installed nfs-common using:-

sudo apt-get install nfs-common

Then,before mounting I have ran these commands:-

rpcinfo -p 192.168.170.52
program vers proto   port  service
100000    4   tcp    111  portmapper
100000    3   tcp    111  portmapper
100000    2   tcp    111  portmapper
100000    4   udp    111  portmapper
100000    3   udp    111  portmapper
100000    2   udp    111  portmapper
100024    1   udp  48435  status
100024    1   tcp  54261  status
100005    1   udp   4242  mountd
100005    2   udp   4242  mountd
100005    3   udp   4242  mountd
100005    1   tcp   4242  mountd
100005    2   tcp   4242  mountd
100005    3   tcp   4242  mountd
100003    3   tcp   2049  nfs

showmount -e 192.168.170.52
Export list for 192.168.170.52:
/ *

after that i tried mounting the hdfs using:--

sudo mount -t nfs  -o vers=3,proto=tcp,nolock 192.168.170.52:/ /mnt/hdfs_mount/

But i was getting this error:---

mount.nfs: mount system call failed

Then i googled for the problem and installed nfs-kernel-server,portmap using

sudo apt-get install nfs-kernel-server portmap

After executing the above command,the output for:---

rpcinfo -p 192.168.170.52

is:--

192.168.170.52: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

and for

showmount -e 192.168.170.52

is:---

clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

Also the output for:--

sudo service nfs start

comes out to be:--

Failed to start nfs.service: Unit nfs.service not found.

Please help me with this.

Solution 1

I was testing this issue on CentOS 7. When you encounter such a problem you have to dig deeply.

The problem:

clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

is related to firewall. The command showmount -e IP_server shows all mounts that are available on server. This command works fine, but you have to be careful which port to open. It does not get through the firewall if only port 2049 has been opened. If the firewall on the NFS server has been configured to let NFS traffic get in, it will still block the showmount command. To test if you disable firewall on server you should get rid of this issue.

So those ports should be open on server:

firewall-cmd --permanent --add-service=rpc-bind
firewall-cmd --permanent --add-service=mountd
firewall-cmd --permanent --add-port=2049/tcp
firewall-cmd --permanent --add-port=2049/udp
firewall-cmd --reload

Additional test 2049/NFS port for availability.

• semanage port -l | grep 2049 - returns SELinux context and the service name
• netstat -tulpen | grep 2049

Solution 2

instead of enabling port 2049 and then set semanage, you can simply add nfs service

firewall-cmd --add-service=nfs --permanent && 
firewall-cmd --reload

Comments

[Bhavya Jain]

@ridgy on the client

[ridgy]

The client only needs nfs-common installed. portmapperand nfs-kernel-server has to be installed on the server, but that already has been done. Maybe it is not OK to export the root filesystem (I never tried that, because it is unusual). Try exporting any other directory to see if it works then.

[Bhavya Jain]

The output for "rpcinfo -p 192.168.170.52" and "showmount -e 192.168.170.52" should be same on the client as it was before installing "nfs-kernel-server and portmap" because I have not modified anything on server side.

[Bhavya Jain]

I am unable to verify your solution as I have now opted for a completly different method.But I appreciate your effort.Thanks

[benathon]

this method worked for me on suse linux. thanks!

[AllisonC]

Can confirm, this works for me on Redhat.

[bgStack15]

Thank you! Mounting the export on a client worked, but showmount -e did not, before applying these steps.