Tuesday, October 12, 2010

How to do host/user/group or netgroup from filer

Often we want to do nslookup for a host or NIS/LDAP lookup for a user or group for troubleshooting purpose. You have a unix system handy and you do it from there however what if you suspect results are not same as what your filer may be getting?

If you are troubleshooting CIFS issue, you are in luck with command 'cifs lookup' however, if you are dealing with DNS or NFS issue then you are out of luck, unless you go into advanced mode. Yes, you go inside advance mode and you get access to lot of other commands including one very nifty command 'getXXbyYY', which is incredibly useful but hidden from the view of admins for some strange reason, really I am not sure why NetApp thinks this shouldn't be available to end user as every time I do troubleshooting I feel the need of this and by no way I see this to be making any sort of changes on filer.

Anyway here's the command, though command says using "man na_getXXbyYY" for additional info however I couldn't locate it on systems therefore I use

test1*> getXXbyYY help
usage: getXXbyYY
Where sub-command is one of
gethostbyname_r
gethostbyaddr_r
netgrp
getspwbyname_r
getpwbyname_r
getpwbyuid_r
getgrbyname
getgrbygid
getgrlist

For more information, try 'man na_getXXbyYY'

Please remember this command is not available in admin mode and search order depends of your /etc/nsswitch.conf entry, so before you start thinking that this isn't working as expected please check these two things first.

Though all the subcommands are self explanatory however I have added small description for each of them.

gethostbyname_r - Resolves host name to IP address from configured DNS server, same as nslookup
gethostbyaddr_r - Retrieves IP address for host name from configured DNS server, same as reverse lookup
netgrp - Checks group membership for given host from LDAP/Files/NIS
getspwbyname_r - Displays user information using shadow file
getpwbyname_r - Displays user information including encrypted password from LDAP/Files/NIS
getpwbyuid_r - Same as above however you provide uid in this command rather than user name
getgrbyname - Displays group name and gid from LDAP/Files/NIS
getgrbygid - Same as above however you provide gid in this command rather than group name
getgrlist - Shows given user's gid from LDAP/Files/NIS

Examples:

test1*> getXXbyYY gethostbyname_r landinghost1
name: landinghost1
aliases:
addresses: 10.21.242.7

test1*> getXXbyYY gethostbyaddr_r 10.21.242.7
name: landinghost1
aliases:
addresses: 10.21.242.7

test1*> getXXbyYY netgrp support-group testhost1
client testhost1 is in netgroup support-group

test1*> getXXbyYY getpwbyname_r root
pw_name = root
pw_passwd = _J9..gsxiYTAHEtV3Qnk
pw_uid = 0, pw_gid = 1
pw_gecos =
pw_dir = /
pw_shell =

test1*> getXXbyYY getpwbyuid_r 0
pw_name = root
pw_passwd = _J9..gsxiYTAHEtV3Qnk
pw_uid = 0, pw_gid = 1
pw_gecos =
pw_dir = /
pw_shell =

test1*> getXXbyYY getgrbyname was
name = was
gid = 10826

test1*> getXXbyYY getgrbygid 10826
name = was
gid = 10826

test1*> getXXbyYY getgrlist wasadmin
pw_name = wasadmin
Groups: 10826
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