Apr
3

how to convert vdi to vmdk in Sun VirtualBox Vbox

Leo on April 3rd, 2009
1. You have to install qemu.
http://free.oszoo.org/ftp/qemu/win32/release/QemuInstall-0.7.2.exe

2. cd c:\Program files\qemu
qemu-img.exe convert -O vmdk hdd.vdi hdd.vmdk

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Apr
3

Enable PostgreSQL access through the Network

Leo on April 3rd, 2009

Most wanted question:
1. How do I access PostgreSQL through the network?
1.1. Open postgresql.conf (in Ubuntu 8.04 at /etc/postgresql/8.3/main/postgresql.conf) and change listen_addresses = ‘localhost’ to listen_addresses = ‘*’.
1.2. Uncomment password_encryption = on.
1.3. Open /etc/postgresql/8.3/main/pg_hba.conf
host all all / trust
eg. host all all 192.168.2.0/24 trust
1.4. Restart PostgreSQL
/etc/init.d/postgresql-8.3

Yes! That works fine!

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Apr
3

Change PostgreSQL Password

Leo on April 3rd, 2009

From linux command prompt:

su - postgres
psql -d template1 -U postgres
alter user postgres with password 'postgres_password';
ctrl+d

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Apr
3

Error: Could not stat() command file ‘/var/lib/nagios2/rw/nagios.cmd’!

Leo on April 3rd, 2009

Oops.

All it needed was
/etc/nagios2#/etc/init.d/nagios2 stop
Stopping nagios2 monitoring daemon: nagios2.
/etc/nagios2# dpkg-statoverride –update –add nagios www-data 2710 /var/lib/nagios2/rw
/etc/nagios2# dpkg-statoverride –update –add nagios nagios 751 /var/lib/nagios2
/etc/nagios2# /etc/init.d/nagios2 start
Starting nagios2 monitoring daemon: nagios2.

ref. http://ubuntuforums.org/showthread.php?t=458375

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Apr
3

Nagios plugin return codes

Leo on April 3rd, 2009

Table 2. Plugin Return Codes

Numeric Value Service Status Status Description
0 OK The plugin was able to check the service and it appeared to be functioning properly
1 Warning The plugin was able to check the service, but it appeared to be above some “warning” threshold or did not appear to be working properly
2 Critical The plugin detected that either the service was not running or it was above some “critical” threshold
3 Unknown Invalid command line arguments were supplied to the plugin or low-level failures internal to the plugin (such as unable to fork, or open a tcp socket) that prevent it from performing the specified operation. Higher-level errors (such as name resolution errors, socket timeouts, etc) are outside of the control of plugins and should generally NOT be reported as UNKNOWN states.

link: http://nagiosplug.sourceforge.net/developer-guidelines.html#AEN35

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Apr
3

Error: Could not stat() command file ‘/var/lib/nagios2/rw/nagios.cmd’!

Leo on April 3rd, 2009

stop nagios2
/etc/nagios2# dpkg-statoverride –update –add nagios www-data 2710 /var/lib/nagios2/rw
/etc/nagios2# dpkg-statoverride –update –add nagios nagios 751 /var/lib/nagios2
start nagios2

Good stuff!

:)

Leonardo

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Apr
3

How to change MySQL Password

Leo on April 3rd, 2009

root@srv:~# mysql -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 14 to server version: 5.0.24a-Debian_9ubuntu2.4-log

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.

mysql> GRANT ALL ON *.* TO root@’%’ IDENTIFIED BY ‘password_you_want’;
Query OK, 0 rows affected (0.00 sec)

mysql>

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Apr
3

Ping does not respond after 8 or 9 successful replies.

Leo on April 3rd, 2009

Today I had an interesting issue on Ubuntu 8.10.

We have 2 NICS on the server one has the following ip 172.16.20.10/16 and another one has 172.16.60.10/16. I know they are on the same network though but we had to do it in order to accomplish some routing issues.

So here is the problem:
When I try to ping our ISPs Gateway it succesful pings till the eighth or ninth reply and stops replying.
On ubuntu 6.10 it works fine.

So here is the solution:

Since we have 2 NICs with the same network address when the second one tries to reach a remote server the Kernel thinks it is a spoofing attack since by default it is enable source address verification against spoofing attacks.
So what you have to do is to change the rp_filter kernel parameter to 0 (zero).

1. Edit 10-network-security.conf
vi /etc/sysctl.d/10-network-security.conf
change to 0 (zero)
2. invoke-rc.d procps start

This is it!

Leonardo

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Apr
3

install ubuntu/debian development tools

Leo on April 3rd, 2009

apt-get install build-essential

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Apr
3

Configure Apache SSL Certificate in Ubuntu 8.04

Leo on April 3rd, 2009
Source: http://ubuntuforums.org/showthread.php?t=791804

setup

1. sudo apt-get install apache2
2. sudo apt-get install openssl
3. sudo apt-get install ssl-cert

create ssl certificate:
sudo make-ssl-cert /usr/share/ssl-cert/ssleay.cnf /etc/ssl/private/localhost.pem

switch to apache sites configuration:
cd /etc/apache2/sites-available/

bakup the default configuration:
sudo cp default default.backup.date

be sure to listen the port 80 for the default:
sudo sed -i ‘1,2s/\*/*:80/’ default

create the ssl configuration:
sudo cp default ssl

set the ssl port:
sudo sed -i ‘1,2s/\*:80/*:443/’ ssl
sudo sed -i “3a\\\tSSLEngine On\n\tSSLCertificateFile /etc/ssl/private/localhost.pem” ssl

enable ssl:
sudo a2ensite ssl
sudo a2enmod ssl

restart apache2:
sudo /etc/init.d/apache2 restart

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