[OmniOS-discuss] slow ssh login, maybee to many locales?

[Andreas Luka]

You maybe check your passing of the language environment from ssh-client  
and sshd-server.

If you want to pass the language environment than make sure that  
/etc/ssh/ssh_config in the client includes the line
SendEnv LANG LC_*

and that /etc/ssh/sshd_config in the server includes the line
AcceptEnv LANG LC_*

and that you have the same hungarian language files present on server and  
client side.üDAndreas

Szia!
Andreas

On Wed, 22 Apr 2015 07:33:19 +0800, PÁSZTOR György  
<pasztor at sagv5.gyakg.u-szeged.hu> wrote:

> Hi,
>
> "Zach Malone" <wzmalone at gmail.com> írta 2015-04-20 10:29-kor:
>> Alternatively, you can define reverse entries for your SSH clients (if
>> you control the DNS server), or just disable reverse DNS lookup in
>> your sshd config altogether.  Are SSH logins to localhost slow?
>> 127.0.0.1 should be defined, so if ssh-ing from your host to itself is
>> quick, that would indicate a DNS issue.
>
> Maybe I did not wrote some detail, which I thought obvious for me.
> Yes, ssh to localhost is sloow too.
> It is my home network, and also I have proper dns records forward and in
> reverse direction.
> As I already said: when I log in from the same workstation to my
> openindiana box or into an openindiana zoen, the ssh is subsecond fast!
> The issue comes only, when I log in to my omnios zone.
>
>> On Mon, Apr 20, 2015 at 10:17 AM, Schweiss, Chip <chip at innovates.com>  
>> wrote:
>> >> I faced with that, the login onto my new omnios zone is slow.
>> >> I tried to debug.
>> >> Many of the symptoms seemed pretty the same as this:
>> >>
>> >>  
>> http://broken.net/uncategorized/resolving-slow-ssh-login-performance-problems-on-openindiana/
>
> Please read this link first!
> As I already wrote: I checked the "basic" things first.
> Also I ruled out that case, what Jason writes about:
> It is not the tpm module.
>
> However the simptoms are similar: My ssh client is also wait at the same
> phase: after the kexinit was sent.
> (However, it not minutes in my case, only ~10 secs)
>
>> >> There are tons's of file openings in the /usr/lib/locale dir at that
>> >> point:
>> >>
>> >> 24560:   8.8232 stat("/usr/lib/locale/is_IS.UTF-8", 0x08047D48) = 0
>> >> 24560:   8.8234  
>> open("/usr/lib/locale//is_IS.UTF-8/LC_CTYPE/LCL_DATA",
>
> I don't know what happens at this point on server side, or what it tries  
> to
> read / check in locale settings, or why...
> BUT
> On one of my openindiana box:
> pasztor at sb:~$ ls -l /usr/lib/locale/
> total 14
> drwxr-xr-x 8 root bin  8 Mar  5  2014 C
> lrwxrwxrwx 1 root root 3 Mar  5  2014 POSIX -> ./C
>
> And compare that to omnios:
> pasztor at omni:~$ ls -l /usr/lib/locale/
> total 2984
> drwxr-xr-x 8 root bin  8 ápr.  18 14:00 af_ZA.UTF-8
> ...
> drwxr-xr-x 8 root bin  8 ápr.  18 14:00 zh_SG.UTF-8
> drwxr-xr-x 8 root bin  8 ápr.  18 14:00 zh_TW.UTF-8
> pasztor at omni:~$ ls -l /usr/lib/locale/ |wc -l
> 223
>
> And another difference:
> pasztor at sb:~$ locale
> LANG=
> LC_CTYPE="C"
> LC_NUMERIC="C"
> LC_TIME="C"
> LC_COLLATE="C"
> LC_MONETARY="C"
> LC_MESSAGES="C"
> LC_ALL=
>
> vs.
> pasztor at omni:~$ locale
> LANG=hu_HU.UTF-8
> LC_CTYPE="hu_HU.UTF-8"
> LC_NUMERIC="hu_HU.UTF-8"
> LC_TIME="hu_HU.UTF-8"
> LC_COLLATE="hu_HU.UTF-8"
> LC_MONETARY="hu_HU.UTF-8"
> LC_MESSAGES="hu_HU.UTF-8"
> LC_ALL=
>
>
> So, Now I tried this:
> root at omni:/usr/lib/locale# mkdir _
> root at omni:/usr/lib/locale# mv * _ ; ln -s _/{C,POSIX} .
> mv: cannot move ?_? to a subdirectory of itself, ?_/_?
> root at omni:/usr/lib/locale# ls -l
> total 15
> lrwxrwxrwx   1 root root   3 Apr 21 23:18 C -> _/C
> lrwxrwxrwx   1 root root   7 Apr 21 23:18 POSIX -> _/POSIX
> drwxr-xr-x 223 root root 224 Apr 21 23:18 _
>
> pasztor at intrepid:/tmp$ time ssh omni date
> Tue Apr 21 23:19:02 UTC 2015
>
> real	0m0.248s
> user	0m0.004s
> sys	0m0.008s
>
>
> So, the problem is definitely about the locales.
> Sshd check into every locale dir on the kexinit phase.
> I think it's a bug. Why on earth does this needed to an ssh login?
>
> Proof 2:
> Now I revert back locale dir into it's original state:
> root at omni:/usr/lib/locale# rm C POSIX ; mv _/* .
> root at omni:/usr/lib/locale# rmdir _
>
> Aaaand:
> pasztor at intrepid:/tmp$ time ssh omni date
> 2015. április 21. 23:21:18 UTC
>
> real	0m9.575s
> user	0m0.028s
> sys	0m0.004s
>
> So, do you understand it now?
> It is definitely not dns.
> I quoted the output of truss on purpose, not just some L'art pour Lart
> thing.
> I also choose the subject carefully, not just because I was bored ;-)
> The situation changed now, it's not "maybe" now. We have definitely a
> proof about that.
>
> Kind regards,
> György Pásztor
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