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Full Discussion: Ssh logon delay
Operating Systems Linux Red Hat Ssh logon delay Post 302801911 by edstevens on Thursday 2nd of May 2013 04:40:25 PM
Old 05-02-2013
Ssh logon delay

OS - Oracle Linux 5.6 and 6.3 (Oracle Linux is based on Red Hat).

Background: I have several OL 5.6 virtual machines running under Virtual Box on my Win7 Pro desktop. Due to the way VBox handles networking through the network adapter it installs on the host OS, I build my vm's with 2 virtual NICs. The first is configured as NAT, becomes eth0 which is configured for DHCP. The second is configured as host-only, becomes eth1 and is configured with a fixed ip address. As soon as the vm goes through it's initial reboot, I configure a putty session on my desktop to access it, and continue my work from there, never again touching the 'console' inside the VBox window. I have done this scores of times with various updates of OL 5.x.

Now I'm trying to bring up a vm with OL 6.3, using all the same configuration. Whenever I try to log on from a putty session, it takes nearly a minute to get back the prompt for the password. This vm lives in the same network environment as any of my 5.x machines, who all behave as expected. I've been working with a friend on the Oracle OTN forum, but we're just about out of ideas. That discussion is at https://forums.oracle.com/forums/thr...7822&#10997822 if you want to see what has already been tried.

I saw another thread on this forum that looked promising, but it seemed to involve a dns cache, as it reported a delay only on the first login after a period of inactivity, whereas my problem is consistent .. on every login.

The most recent test, and possibly the most telling, is this ... notice the time difference from the start to the finish of the 'hostname' command:

Code:
[root@vblnxsrv02 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@vblnxsrv02 ~]# date;hostname -f;date
Thu May  2 14:00:17 CDT 2013
hostname: Host name lookup failure
Thu May  2 14:01:13 CDT 2013
[root@vblnxsrv02 ~]#

[root@vblnxsrv02 ~]# date;dnsdomainname ;date
Thu May  2 14:05:16 CDT 2013
dnsdomainname: Host name lookup failure
Thu May  2 14:06:12 CDT 2013

 

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Session::Store::Oracle(3)				User Contributed Perl Documentation				 Session::Store::Oracle(3)

NAME
Apache::Session::Store::Oracle - Store persistent data in a Oracle database SYNOPSIS
use Apache::Session::Store::Oracle; my $store = new Apache::Session::Store::Oracle; $store->insert($ref); $store->update($ref); $store->materialize($ref); $store->remove($ref); DESCRIPTION
Apache::Session::Store::Oracle fulfills the storage interface of Apache::Session. Session data is stored in a Oracle database. SCHEMA
To use this module, you will need at least these columns in a table called 'sessions': id varchar2(32) # or however long your session IDs are. a_session long To create this schema, you can execute this command using the sqlplus program: CREATE TABLE sessions ( id varchar2(32) not null primary key, a_session long ); If you use some other command, ensure that there is a unique index on the table's id column. CONFIGURATION
The module must know what datasource, username, and password to use when connecting to the database. These values can be set using the options hash (see Apache::Session documentation). The options are DataSource, UserName, and Password. Example: tie %hash, 'Apache::Session::Oracle', $id, { DataSource => 'dbi:Oracle:database', UserName => 'database_user', Password => 'K00l' }; Instead, you may pass in an already-opened DBI handle to your database. tie %hash, 'Apache::Session::Oracle', $id, { Handle => $dbh }; The last option is LongReadLen, which specifies the maximum size of the session object. If not supplied, the default maximum size is 8 KB. AUTHOR
This modules was written by Jeffrey William Baker <jwbaker@acm.org> A fix for the commit policy was contributed by Michael Schout <mschout@gkg.net> SEE ALSO
Apache::Session, Apache::Session::Store::DBI perl v5.12.1 2007-09-28 Session::Store::Oracle(3)
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