Archive for April, 2010

Send Mail Errors

April 18, 2010

1. CNAME lookup failed temporarily. (#4.4.3) –

This means that the mail router cannot find the correct information for the domain. This is a mail routing problem. Please consult to the people who manage the mail server.

It sometimes happen with Qmail. so may be something to do with Qmail being unable to handle oversized DNS query responses. Some time upgrading Qmail version fix the problem.

2. Domain of sender address does not resolve

This simply refer that your mail server cannot talk with your specified name server to resolve the domain name. Verify your DNS settings.

3. Local configuration error config error: mail loops back to me (MX problem?)

This refer to someone update or change your dns mx record entry for your mail server and the ip is not valid.

dig -t mx

verify with this command.

Oracle 10g on Debian 64bit (32 bit as well)

April 5, 2010

Preparing the system
We will have to:

* Create required users and groups accounts
* Set required system parameters in /etc/sysctl.conf
* Installing complementary packages

Creating Oracle Inventory and dba group:

sudo groupadd oinstall
sudo groupadd dba

Creating Oracle user home and account:

sudo useradd -g oinstall -G dba -d /opt/oracle -s /bin/bash oracle
sudo chown -R oracle:oinstall /opt/oracle

Adding nobody group to nobody user:

sudo addgroup nobody
sudo usermod -g nobody nobody

Updating kernel parameters

This is one of the longest task of this installation. Because you will have to check your current config.
Check commands in Oracle documentation for this, section 6 Configuring Kernel Parameters.

Then, edit the file /etc/sysctl.conf as described below:

sudo gedit /etc/sysctl.conf

Add the following lines:

# Oracle 10g
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 32768 65000
# Replace kernel.shmmax with the half of your memory in bytes
# 1073741824 is 1 GigaBytes
net.core.rmem_default = 262144
net.core.rmem_max = 262144
net.core.wmem_default = 262144
net.core.wmem_max = 262144
# To allow dba to allocate hugetlbfs pages
# 1002 is your DBA group, id. grep dba /etc/group will give this value
vm.hugetlb_shm_group = 1002

Must adjust the kernel.shmmax parameter rest works with default value.

sysctl -p to activate the new value
sysctl -a to list the value already set


This is needed on Ubuntu Karmic and was not required on Ubuntu Jaunty (kernel parameters were apparently different).

Without this parameters your Oracle instance won’t start.

You have to replace the value of 1002 with the group ID of the DBA group.

Read this great howto install Oracle on debian to know more about huge tlb parameter.

Now, update /etc/security/limits.conf:

sudo gedit /etc/security/limits.conf

And add the following parameters:

# Oracle
oracle soft nproc 2047
oracle hard nproc 16384
oracle soft nofile 1024
oracle hard nofile 65536

Check that /etc/pam.d/login contains a line like this one:

session required

Installing additional packages

If not already done, update your distribution with the latest packages:

sudo apt-get update
sudo apt-get dist-upgrade

Install the following additional packages:

sudo apt-get install gcc make binutils gawk x11-utils rpm alien ksh lsb-rpm
sudo apt-get install autotools-dev libltdl-dev
sudo apt-get install –yes autoconf automake binutils bzip2 doxygen gcc less libc6-dev make perl-doc unzip zlibc
sudo apt-get install libaio1 lesstif2 libmotif3 libaio-dev

# Some of the ones below may not be needed, but as of many failures before getting it doing right, all these have been installed.
sudo apt-get install libpthread-stubs0 libpthread-stubs0-dev libpth-dev libc6-i386 libc6-dev-i386
sudo apt-get install g++-multilib gcc-multilib

And also these below to try to get ride of link errors.

sudo aptitude install lesstif2-dev lib32stdc++6 lib32z1 sysstat rlwrap unixodbc unixodbc-dev elfutils
sudo apt-get install gsfonts-x11 java-common sun-java6-bin sun-java6-jre

And to prevent from runInstaller terrific ./runInstaller: line 54: ./install/.oui: No such file or directory error message:

sudo apt-get install ia32-libs

Oracle 10g also needs libstdc++5 that is not provided with Debian.

There are many ways to install it,
Simply apt-get install libstdc++5 should work with Debian

But you can follow this too
I have followed this howto to install libstdc++5 on Ubuntu Karmic

mkdir /tmp/libstdc++5
cd /tmp/libstdc++5

sudo dpkg –force-architecture -i libstdc++5_3.3.6-17ubuntu1_i386.deb
sudo mv /usr/lib/* /usr/lib32/

sudo dpkg -i libstdc++5_3.3.6-17ubuntu1_amd64.deb

Now reboot your system to be sure these parameters will be taken in account for the next part of the installation.

Others configurations

Now, change default sh script by bash:

sudo ln -sf /bin/bash /bin/sh

Then some others commands used by Oracle installer:

sudo ln -s /usr/bin/awk /bin/awk
sudo ln -s /usr/bin/rpm /bin/rpm
sudo ln -s /usr/bin/basename /bin/basename

Installing Oracle

extract the downloaded file:

cpio -idmv < 10201_database_linux_x86_64.cpio

./runInstaller -ignoreSysPrereqs

Starting and stopping Oracle

We should now be able to start Oracle database if you had choosed to create one during installation. Yes go to next section Creating an Oracle database and come back.

First, add the following variable declaration in your oracle user .profile, .bashrc or .bash_profile scripts:

export PATH=$PATH:/usr/local/bin

if [ -f /usr/local/bin/oraenv ];then
. /usr/local/bin/oraenv

Starting up the database

Finally, to manually start Oracle, run these commands as oracle user

lsnrctl start

You may encounter this error Failed to auto-start Oracle Net Listene using /ade/vikrkuma_new/oracle/bin/tnslsnr.

Also your database may not start.
Then, first check in /etc/oratab that it has the ‘Y’ flag, if not, set it.

sudo gedit /etc/oratab

And replace N by Y


To get ride of this the Failed to auto-start Oracle Net Listene using /ade/vikrkuma_new/oracle/bin/tnslsnr message, edit dbstart script and replace the hardcoded path with $ORACLE_HOME


And edit this part of script

# Set this to bring up Oracle Net Listener

Connecting to the database

Now, just try to connect to the freshly started database:

oracle@ubuntu-laptop:~/oracle10gse/product/10.2.0/db_1/log$ sqlplus system@orcl
SQL*Plus: Release – Production on Thu Feb 11 12:01:24 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Enter password:
Connected to:
Oracle Database 10g Release – 64bit Production
SQL> select ‘Oracle 10g is working on Debian 5.0’ as SUCCESS from dual;
Oracle 10g is working on Debian 5.0

Shutting down the database

Just entry the following commands with Oracle user:

lsnrctl stop