Re: [gentoo-user] nscd; what am I doing wrong?

[Richard Fish]

On 12/21/05, Walter Dnes <waltdnes@××××××××.org> wrote:
> On Fri, Dec 09, 2005 at 05:08:55PM -0700, Richard Fish wrote
>
> > nscd does this, and is much simpler.  It is already installed as part
> > of glibc.  Just do rc-update -a nscd default.
>
>   My system is connecting to the net, but nscd doesn't seem to be
> caching DNS requests.
>
>   Yes, I did "rc-update add nscd default" and "/etc/init.d/nscd start".
> But "ping -c 4 google.com" sends traffic to 192.168.123.254 port 53
> each time, even if only 30 seconds apart.  This was confirmed by running
> "tcpdump -n dst port 53" in another console and watching the output.

Everything looks ok.  Could you try:

strace -f -o /tmp/strace.out ping -c 4 www.google.com

Then take a look at /tmp/strace.out.  You find some output that looks
something like this:

   socket(PF_FILE, SOCK_STREAM, 0)   = 4
   fcntl64(4, F_GETFL)               = 0x2 (flags O_RDWR)
   fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
   connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = 0
   poll([{fd=4, events=POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}], 1, 5000) = 1
   writev(4, [{"\2\0\0\0\r\0\0\0\6\0\0\0", 12}, {"hosts\0", 6}], 2) = 18
   poll([{fd=4, events=POLLIN|POLLERR|POLLHUP,
revents=POLLIN|POLLHUP}], 1, 5000) = 1
   recvmsg(4, {msg_name(0)=NULL, msg_iov(1)=[{"\324_\1A(?", 6}],
msg_controllen=0, msg_flags=0}, 0) = 0
   close(4)                          = 0
   socket(PF_FILE, SOCK_STREAM, 0)   = 4
   fcntl64(4, F_GETFL)               = 0x2 (flags O_RDWR)
   fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
   connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = 0
   poll([{fd=4, events=POLLOUT|POLLERR|POLLHUP, revents=POLLOUT}], 1, 5000) = 1
   writev(4, [{"\2\0\0\0\4\0\0\0\17\0\0\0", 12}, {"www.google.com\0",
15}], 2) = 27
   poll([{fd=4, events=POLLIN|POLLERR|POLLHUP,
revents=POLLIN|POLLHUP}], 1, 5000) = 1
   read(4, "\2\0\0\0\1\0\0\0\17\0\0\0\0\0\0\0\2\0\0\0\4\0\0\0\1\0\0"...,
32) = 32
   readv(4, [{"www.google.com\0", 15}, {"Bf\7c", 4}], 2) = 19
   read(4, NULL, 0)                  = 0
   close(4)                          = 0

-Richard

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