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Creating graph of Trac workflow

Submitted by sandip on Fri, 08/15/2008 - 12:01. | Tags:
1
point

Here is how, I was able to generate graph of the workflow being used in Trac. This helps quite a bit when trying to visualize the workflow that is being setup.

The packages required were ghostscript (ps2pdf conversion) and graphviz (graph creation).

Graphviz is available in DAGs/rpmforge repository, so do an install via:

# yum --enablerepo=rpmforge install ghostscript graphviz graphviz-python

Once graphviz is installed generate config files:

# dot -c

Download the corresponding contrib files from the trac svn:

$ wget http://svn.edgewall.com/repos/trac/tags/trac-0.11/contrib/workflow/showworkflow
$ wget http://svn.edgewall.com/repos/trac/tags/trac-0.11/contrib/workflow/workflow_parser.py

Make the files executable and run:

./showworkflow /path/to/trac.ini

This should generate a pdf file in the same directory as trac.ini file.

Note: If doing this on a server xpdf will fail, so move the pdf to a web accessible directory to view it.

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Bridge Networking On OpenVZ Containers Using VETH Devices

Submitted by sandip on Wed, 08/13/2008 - 23:52. | Tags:
1
point

1. Host will be open on LAN and guests on WAN. Additionally, there is a bridged LAN for guests.
2. We will be using bridge networking for protecting the Host Network and saving IP addresses, also giving flexibility with the guest network setup.
3. Configure LAN Eth1 port to 192.168.1.2
4. WAN Eth0 port is not assigned any IP address.
6. Install the required bridge-utils package via:

yum install bridge-utils

* Network:

# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=<host.domain.tld>
GATEWAY=192.168.1.1
GATEWAYDEV="eth1"

* WAN Bridge device br0:

# cat /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
BROADCAST=xxx.xxx.xxx.xxx
NETMASK=255.255.255.24
NETWORK=xxx.xxx.xxx.xxx
ONBOOT=yes
GATEWAY=xxx.xxx.xxx.xxx
TYPE=Bridge

* WAN eth0 device:

# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:30:48:65:12:b4
ONBOOT=yes
TYPE=Ethernet
BRIDGE=br0

* LAN Bridge device br1:

# cat /etc/sysconfig/network-scripts/ifcfg-br1
DEVICE=br1
ONBOOT=yes
TYPE=Bridge
IPADDR=192.168.1.2
NETMASK=255.255.255.0
GATEWAY=192.168.1.1

* LAN eth1 device:

# cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
HWADDR=00:30:48:65:12:b5
ONBOOT=yes
TYPE=Ethernet
BRIDGE=br1

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Milter-Greylist: Retrieve the Messages

Submitted by sasserw on Fri, 08/08/2008 - 09:35.

Is there a way to "ressnd" a message that has been filtered out by the Milter-Greylist? Where do the messages go for the que when they come in?

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Difference between bytes and bits

Submitted by sandip on Sat, 07/26/2008 - 13:34. | Tags:
1
point

Bits are 1s or 0s representing the state of a switch, in binary form.

A byte is a binary word, consisting of 8 bits.

8 bits equals one Byte.

1024 bytes equals one KiloByte (KB)

1024 KiloBytes equals one MegaByte (MB)

1024 MegaBytes equals one GigaByte (GB)

Sometimes people use 1000 instead of 1024, so numbers sometimes get screwy.

A bit is always represented by a small "b", a Byte is always represented by a large "B".

It is common practice to use bits in reference to interface speeds and bytes in reference to memory and storage capacities.

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Importing existing SSL key and certificate for tomcat

Submitted by sandip on Fri, 07/25/2008 - 16:50. | Tags:
1
point
  1. Convert key and cert to a single pkcs12 format.

    openssl pkcs12 -export -inkey <pathto>/key.txt -in <pathto>/cert.txt -out cert.pkcs12

  2. Remove existing tomcat aliased PrivateKeyEntry from cacerts.

    keytool -delete -alias tomcat -keystore <pathto>/cacerts

  3. Use java-1.6 keytools to import PKCS12 keystoretype into existing cacerts keystore file.

    keytool -importkeystore -destkeystore cacerts -srckeystore cert.pkcs12 -srcstoretype PKCS12

  4. Note the alias of the newly imported PrivateKeyEntry, which would normally be 1.

    keytool -list -keystore <pathto>/cacerts | grep PrivateKeyEntry

  5. Change the alias to tomcat.

    keytool -changealias -alias 1 -destalias tomcat -keystore <pathto>/cacerts

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Simple captcha for oscommerce contact form

Submitted by sandip on Thu, 07/24/2008 - 21:52. | Tags:
1
point

Embed the captcha image by calling a php script in "contact_us.php":

<img src="/image.php" width="60" height="20" alt="Please enter the values from this image" />

Edit contact_us.php file and exactly after the below line:

  if (isset($HTTP_GET_VARS['action']) && ($HTTP_GET_VARS['action'] == 'send')) {

place the verification code:

        // Captcha check
        $t = trim($HTTP_POST_VARS['verify']);
        if ($t == "") {
                $captcha_error = "Enter the verification code!";
                $error = true;
                $messageStack->add('contact', $captcha_error);
        } else if (trim($_SESSION["thecode"]) == "") {
                $captcha_error = "No verification code generated!";
                $error = true;
                $messageStack->add('contact', $captcha_error);
        } else if ($_SESSION["thecode"] != strtoupper($t)) {
                $captcha_error = "Invalid verification code!";
                $error = true;
                $messageStack->add('contact', $captcha_error);
        }
        else
        { // End Captcha Check

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