Lab 5.2 clnt_create: RPC: Program not registered

jnennen

After trying to run the CreateNFS.sh script (errors because of exportfs and showmount not found) and installing nfs-kernel-server manually, when running showmount -e localhost, I receive the following error:

clnt_create: RPC: Program not registered

What can I do?

chrispokorni

Hi @jnennen,

What is your guest OS?

Regards,
-Chris

jnennen

Hey @chrispokorni,

I'm running Ubuntu 20.04 on a GCE VM.

Regards,
Joachim

chrispokorni

Hi @jnennen,

sudo showmount -e localhost assumes that the installation and config steps of the CreateNFS.sh script completed successfully, and that the /etc/hosts file has a 127.0.0.1 localhost entry for name resolution purposes. If the hosts file is incomplete, incorrect, or corrupted, you may try to replace localhost with its corresponding IP address sudo showmount -e 127.0.0.1.

Regards,
-Chris

jnennen

Hey @chrispokorni,

unfortunately that didn't help, I get the same response as before. I also looked into the /etc/hosts file, it holds the correct 127.0.0.1 localhost entry.

Regards,
Joachim

chrispokorni

Hi @jnennen,

Please provide the commands and their outputs from your terminal for the seven manual installation and config steps that are found in the CreateNFS.sh script, as they were performed on the control plane node.
Also, provide the outputs for:

sudo ls -la /opt/sfw/
sudo cat /opt/sfw/hello.txt
sudo cat /etc/exports

When setting up the GCE VMs, the VPC and its firewall, did you follow the recommendations form the demo video from the introductory chapter?

Regards,
-Chris

jnennen

Sure, here you go:

student@cp:~$ sudo apt-get update && sudo apt-get isntall -y nfs-kernel-server
Hit:1 http://europe-west1.gce.archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://europe-west1.gce.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Hit:3 http://europe-west1.gce.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:4 https://download.docker.com/linux/ubuntu focal InRelease
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Ign:6 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
Err:7 https://packages.cloud.google.com/apt kubernetes-xenial Release
  404  Not Found [IP: 74.125.140.139 443]
Get:8 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [2774 kB]
Get:9 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [421 kB]
Reading package lists... Done
E: The repository 'https://apt.kubernetes.io kubernetes-xenial Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.


student@cp:~$ sudo mkdir /opt/sfw
mkdir: cannot create directory ‘/opt/sfw’: File exists


student@cp:~$ sudo bash -c "echo software > /opt/sfw/hello.txt"


student@cp:~$ sudo bash -c "echo '/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)' >> /etc/exports"


student@cp:~$ sudo exportfs -ra
exportfs: duplicated export entries:
exportfs:       *:/opt/sfw
exportfs:       *:/opt/sfw


student@cp:~$ sudo showmount -e localhost
clnt_create: RPC: Program not registered

The additional commands give this output:

student@cp:~$ sudo ls -la /opt/sfw/
total 12
drwxrwxrwt 2 root root 4096 Mar  7 19:21 .
drwxr-xr-x 5 root root 4096 Mar  7 19:21 ..
-rw-r--r-- 1 root root    9 Mar 11 17:03 hello.txt


student@cp:~$ sudo cat /opt/sfw/hello.txt
software


student@cp:~$ sudo cat /etc/exports
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)
/opt/sfw/ *(rw,sync,no_root_squash,subtree_check)

(Guess the last is bc I tried it multiple times by now?)

I created the GCE VM and surroundings according to the recommendations from the demo video.

Regards,
Joachim

chrispokorni

Hi @jnennen,

It seems the nfs-kernel-server is not getting installed... perhaps the typo in your ... apt-get isntall -y ... command has something to do with that.
I'd also recommend cleaning up the /etc/exports file to only include a single /opt/sfw/ * ... entry.

Once the typo above is fixed and the package successfully installed, what is the output of:

sudo systemctl list-units | grep nfs

I just attempted a clean manual install of the nfs-kernel-server package with all its configurations from the CreateNFS.sh script and I was not able to reproduce your issue. All steps from the script run without any issues.

Regards,
-Chris

jnennen

I checked, the typo does not lead to the issues above, nfs-kernel-server is already installed. sudo apt-get update is responsible for that, possibly because of the Kubernetes repo update?

student@cp:~/app2$ sudo systemctl list-units | grep nfs
  proc-fs-nfsd.mount    loaded active     mounted   NFSD configuration filesystem
● nfs-server.service    loaded failed     failed    NFS server and services
  nfs-utils.service loaded active     exited    NFS server and client services

If you had no issues on a clean install I guess I will try to set that up later, thanks.

Regards,
Joachim