ping works as expected...
root@net1# strace -e open /bin/ping localhost 2>&1
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib/libc.so.6", O_RDONLY) = 3
open("/etc/resolv.conf", O_RDONLY) = 4
open("/etc/resolv.conf", O_RDONLY) = 4
open("/etc/nsswitch.conf", O_RDONLY) = 4
open("/etc/ld.so.cache", O_RDONLY) = 4
open("/lib/libnss_files.so.2", O_RDONLY) = 4
open("/etc/host.conf", O_RDONLY) = 4
open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 4
Hum... Looks like resolver conf files are walked in libc...
root@net1# ldd /bin/ping
linux-vdso.so.1 => (0x00007fff63452000)
libc.so.6 => /lib/libc.so.6 (0x00007f6585db6000)
/lib64/ld-linux-x86-64.so.2 (0x00007f6586145000)
root@net1# strings /lib/libc.so.6 | grep /etc
/etc/localtime
/etc/gai.conf
/etc/mtab
/etc/hostid
/etc/ttys
/etc/shells
/etc/fstab
/etc/.pwd.lock
/etc/resolv.conf
/etc/host.conf
/etc/nsswitch.conf
/etc/hosts.equiv
/etc/bindresvport.blacklist
So the question is why the host command ignores all these files and ping
honors them.
Or rather howto configure system wide honoring of all these files for
resolver access from any command.
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https://bugs.launchpad.net/bugs/736149
Title:
Ubuntu 10.10 /etc/hosts ignored by /lib/resolv.so.2
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