Name lookup question 2005-05-12 - By Ed Brown
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On Thu, 2005-05-12 at 10:39, Collins, Kevin [MindWorks] wrote:
> Yes, that makes sense, I guess. The biggest issue I have is that I don't
> have a good tool to see how the OS is resolving a certain name or IP
> address.
This:
getent hosts <ip.or.hostname.to.lookup>
I think is the best way to test the nsswitch path. 'Host' appears to go
straight to the dns libraries.
# strace -e trace=open getent hosts redhat.com
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib/tls/libc.so.6", O_RDONLY) = 3
open("/etc/resolv.conf", O_RDONLY) = 3
open("/etc/nsswitch.conf", O_RDONLY) = 3
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib/libnss_files.so.2", O_RDONLY) = 3
open("/etc/host.conf", O_RDONLY) = 3
open("/etc/hosts", O_RDONLY) = 3
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib/libnss_dns.so.2", O_RDONLY) = 3
open("/lib/libresolv.so.2", O_RDONLY) = 3
open("/etc/hosts", O_RDONLY) = 3
209.132.177.50 redhat.com
# strace -e trace=open host redhat.com
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/usr/lib/libdns.so.16", O_RDONLY) = 3
open("/usr/lib/libisc.so.7", O_RDONLY) = 3
open("/lib/libcrypto.so.4", O_RDONLY) = 3
open("/lib/libnsl.so.1", O_RDONLY) = 3
open("/lib/tls/libpthread.so.0", O_RDONLY) = 3
open("/lib/tls/libc.so.6", O_RDONLY) = 3
open("/usr/kerberos/lib/libgssapi_krb5.so.2", O_RDONLY) = 3
open("/usr/kerberos/lib/libkrb5.so.3", O_RDONLY) = 3
open("/usr/kerberos/lib/libcom_err.so.3", O_RDONLY) = 3
open("/usr/kerberos/lib/libk5crypto.so.3", O_RDONLY) = 3
open("/lib/libresolv.so.2", O_RDONLY) = 3
open("/lib/libdl.so.2", O_RDONLY) = 3
open("/usr/lib/libz.so.1", O_RDONLY) = 3
open("/usr/share/locale/C/libdst.cat", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/usr/share/locale/C/LC_MESSAGES/libdst.cat", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/share/locale/C/libdst.cat", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/usr/share/locale/C/LC_MESSAGES/libdst.cat", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/share/locale/C/libisc.cat", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/usr/share/locale/C/LC_MESSAGES/libisc.cat", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/share/locale/C/libisc.cat", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/usr/share/locale/C/LC_MESSAGES/libisc.cat", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/share/locale/C/libdns.cat", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/usr/share/locale/C/LC_MESSAGES/libdns.cat", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/share/locale/C/libdns.cat", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/usr/share/locale/C/LC_MESSAGES/libdns.cat", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/etc/resolv.conf", O_RDONLY) = 5
redhat.com has address 209.132.177.50
-Ed
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