Need much better error message when auth module load fails.

[morrone]

I came across the following error:

ldmsd[67238]: Mon Jul 20 12:24:56 2020: ERROR     : 'rdma' transport creation with auth 'munge' failed, error: ENOENT(2). Please check transpot configuration, authentication configuration, ZAP_LIBPATH (env var), and LD_LIBRARY_PATH.

This message is terrible. Eventually I realized that the problem was pretty simple: I hadn't built the ldms auth plugin. The resolution of this issue would have been much, much less time consuming if I was given a useful error message like:

ERROR: Unable to load authentication plugin "/usr/lib64/libldms_auth_munge.so", error: ENOENT(2)

[baallan]

+1 also, consider extending auth protocol so the server sends back a hint about the accepted authentication methods if auth method attempted is not configured.

[tom95858]

Actually, we could add the supported auth to the connect_data exchanged when the connection begins.

On Thu, Jul 23, 2020 at 5:18 PM Benjamin Allan [email protected] wrote:

+1 also, consider extending auth protocol so the server sends back a hint about the accepted authentication methods if auth method attempted is not configured.

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