Tag Archives: driver

Using ejabberd with MySQL native driver

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Get mysql driver (if ejabberd < 2.0.0)

If you are using an ejabberd version previous to 2.0.0 (about end of 2007) then you need to put the MySQL .beam files somewhere in your Erlang path (possibly with your ejabberd .beam files):

cd /opt/
wget https://support.process-one.net/doc/download/attachments/415/mysql_beam.tar.gz
tar xvfz mysql_beam.tar.gz
cp -v *.beam /var/lib/ejabberd/ebin/

Mysql initialization

mysql> GRANT ALL ON ejabberd.* TO 'ejabberd'@'' IDENTIFIED BY '';
Query OK, 0 rows affected (0.06 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.02 sec)

Empty database creation:

mysql> CREATE DATABASE ejabberd;
Query OK, 1 row affected (0.00 sec)

Schema creation:

cd /tmp
wget http://svn.process-one.net/ejabberd/trunk/src/odbc/mysql.sql
mysql ejabberd &lt; mysql.sql -p
Enter password:

Check that the database structure has been correctly created:

echo "show tables;" | mysql -D ejabberd -uroot -p
Enter password:
Tables_in_ejabberd
last
privacy_default_list
privacy_list
privacy_list_data
private_storage
rostergroups
rosterusers
spool
users
vcard
vcard_search

Ejabberd configuration

If you installed ejabberd from sources, you would probably need to proceed compiling again but using:

./configure --enable-odbc

Comment out the following line in ejabberd.cfg:

{auth_method, internal}.

Add the following lines in ejabberd.cfg:

{auth_method, odbc}.
{odbc_server, {mysql, "localhost", "ejabberd", "ejabberd", "password"}}.

Note: The MySQL configuration description is of the following form:

{mysql, Server, DB, Username, Password}

When you have done that user accounts are stored in MySQL. You can define extra information that you might want to store in MySQL. Change the module used in ejabberd.cfg to change the persistence from the Mnesia database to MySQL:

* Change mod_last to mod_last_odbc to store the last seen date in MySQL.
* Change mod_offline to mod_offline_odbc to store offline messages in MySQL.
* Change mod_roster to mod_roster_odbc to store contact lists in MySQL.
* Change mod_vcard to mod_vcard_odbc to store user description in MySQL.

References

Fixing VMWare vmxnet driver networking issues under Debian Linux

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It seems that using particular combinations of VMWare Server and Linux Kernel version(s) while installing VMWare Tools under Linux guest machines, may render the virtual machine’s networking down.

This page provides a “hacky” workaround to solve this situation. There might be other deeper and more proper solutions out there but I came up with this one because it is very simple to put in place and not harmful at all.

So, let’s imagine this scenario:

  • VMWare Server 1.0.2 (other versions might apply as well, not tested thought)
  • Debian Linux 4.0 Etch guest, running 2.6.18-6-686 kernel (other versions might apply as well, not tested thought)
  • VMWare Tools 1.0.2-39867 (other versions might apply as well, not tested thought)

Then, after the VMWare Tools get installed, the screen shows something like this:

The configuration of VMware Tools 1.0.2 build-39867 for Linux for this running
kernel completed successfully.

You must restart your X session before any mouse or graphics changes take
effect.

You can now run VMware Tools by invoking the following command:
"/usr/bin/vmware-toolbox" during an X session.

To use the vmxnet driver, restart networking using the following commands:
/etc/init.d/networking stop
rmmod pcnet32
rmmod vmxnet
depmod -a
modprobe vmxnet
/etc/init.d/networking start

Enjoy,

--the VMware team

Right now the networking does not work. If you try to see what is going on, you should see something like this:

ifconfig

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1556 (1.5 KiB)  TX bytes:1556 (1.5 KiB)

That’s it. No network interfaces. If you go for VMWare Tools’ installer suggested steps, the networking should work again:

/etc/init.d/networking stop
rmmod pcnet32
rmmod vmxnet
depmod -a
modprobe vmxnet
/etc/init.d/networking start

E.g.:

ifconfig

eth0      Link encap:Ethernet  HWaddr 00:0C:29:23:95:ED
          inet addr:10.123.16.83  Bcast:10.123.16.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe23:95ed/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4425 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7426 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:316655 (309.2 KiB)  TX bytes:494628 (483.0 KiB)
          Interrupt:169 Base address:0x1424

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1556 (1.5 KiB)  TX bytes:1556 (1.5 KiB)

The issue here is that this settings will be lost upon restart. I guess it is a matter of having the proper modules loaded properly but I have not been able to find the proper configuration files combination to get this reliably enough.

Proposed solution/workaround

Basically, create a simple script that does what VMWare Tools’ intaller suggests and have it invoked upon system restart.

The script should contain the following:

#! /bin/bash
#
# vmxnet driver loader - loads the vmware network driver.
#
#

PATH=/sbin:/bin:/usr/sbin:/usr/bin

/etc/init.d/networking stop
rmmod pcnet32
rmmod vmxnet
depmod -a
modprobe vmxnet
/etc/init.d/networking start

This file should be created under /etc/init.d folder, with 755 permissions (i.e. chmod 755 filename). The, to have it invoken upon restart you could do this:

update-rc.d vmxnet-loader defaults 10
 Adding system startup for /etc/init.d/vmxnet-loader ...
   /etc/rc0.d/K10vmxnet-loader -> ../init.d/vmxnet-loader
   /etc/rc1.d/K10vmxnet-loader -> ../init.d/vmxnet-loader
   /etc/rc6.d/K10vmxnet-loader -> ../init.d/vmxnet-loader
   /etc/rc2.d/S10vmxnet-loader -> ../init.d/vmxnet-loader
   /etc/rc3.d/S10vmxnet-loader -> ../init.d/vmxnet-loader
   /etc/rc4.d/S10vmxnet-loader -> ../init.d/vmxnet-loader
   /etc/rc5.d/S10vmxnet-loader -> ../init.d/vmxnet-loader

I suggest having the initscript invoked with a lower sequence code (i.e. 10) so the networking gets activated before other services which may use and/or need it.

That’s it. Now your virtual machine’s networking should be fine upon restarts.

See Also