Re: Installation problems

On Wed, Aug 10, 2005 at 07:35:16PM -0700, Robert Bates wrote:
> Hi Simone and Rick,
> 
> I found problem number 2.  I did something wrong with the loopback which
> killed network and generated the IP conflict errors but removed them and now
> at least they can see the network.
> 
> On problem 1 I don't have the virtual IPs in haresources.  For some reason I
> can't seem to get the syntax right because it keeps throwing errors.  This
> is what I have
> 
> 192.168.0.100  virtual web server
> 192.168.0.101  real web server 1
> 192.168.0.102  real web server 2
> 
> 192.168.0.200  virtual mysql server
> 192.168.0.201  real mysql server 1
> 192.168.0.202  real mysql server 2

Adding IPaddr2::192.168.0.100/24/eth0 and IPaddr2::192.168.0.200/24/eth0
to your haresourses should add this.


To elaborate slightly on ip vs ifconfig, which came up in another mail.

ifconfig is the old-school way of configuring interfaces. It along with
route is what the IPaddr resource uses. This works, mostly, but it turns
out that ifconfig is not very well suited to this kind of work for a
variety of reasons. IPaddr2 is a reimlimentation of IPaddr which makes
use if the ip command, and as a result is a lot cleaner, and provides
some features that are either impossible, or to complex to provide using
IPaddr. 

For your purposes either should do, the syntax is the same. 
But IPaddr2 is the way of the future, so I recommend using that.

ip is a more powerful tool that allows you to configure interfaces,
routing, policy routing, and all sorts of other fun stuff.
As mentioned above, this is what IPaddr2 uses.

The main catch is that the model that ifconfig uses to add additional
addresses to an interface - called an alias - basically sets up a
separate virtual interface. Whereas ip just adds a secondary address to
the interface. This is important because while ip can see aliases set up
using ifconfig, ifconfig can't see secondary addresses added using ip.

So if you use ifconfig (which lets face it is a bit easier to type,
especially if you have been using it for years) and you think
there are some addresses missing, double check using ip addr sh

-- 
Horms


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