Passwordless SSH authorization problem

English Network/Internet
1

I set-up a server-node cluster with OpenSuSE 11.1 on a pack of workstations and configured passwordless SSH.
I configured like following:

cd ~/.ssh
ssh-keygen -t rsa
cat id_rsa.pub >> authorized_keys
cat id_rsa.pub >> authorized_keys2
echo “StrictHostKeyChecking no” >> config
rm known_hosts*
chmod go-w ~

Since the server and nodes are configured with NFS and NIS, the passwordless SSH is working well

ex)
sinfire@Lit:~> ssh l01

Last login: xxxx from lit.yonsei.ac.kr
Have a lot of fun…

sinfire@l01:~>

The problem is whenever I try to write a file or directory from the node (in this case, l01), authority issues come to problem

ex)
sinfire@l01:~> mkdir tmp
mkdir: cannot create directory ‘tmp’: read-only file system

I think the problem is arising from the last line in ‘id_rsa.pub’, which is “[some random characters…]==sinfire@Lit”, but I have no idea how to change it.

Do I have to add the ids for the nodes like ‘sinfire@l??’ for the last line? If I do, what would be the exact syntax here?

2

I don’t think it is related to ssh. Are you able to do mkdir when connected directly to that machine?

3

Problem solved.

The problem was the NFS option.

We used SuSE 10.2 when configuring previous clusters and to my knowledge it was set to ‘rw’(read-write) for default.

But I see SuSE 11.1 uses ‘ro’(read-only) for default.

I changed the ‘ro’ option to ‘rw’ and restarted the NFS daemon, and it works like wonder.

4

Good that you found the problem.