On Thu, Mar 29, 2007 at 09:30:51PM -0700, Tanveer Chowdhury wrote:
> Finally I am going to implement it on my home PCs each with 2 NICS before
> attempting it in production servers. One(eth0) is connected to DSL cable for
> intenet and other(eth1) I will use for Local intranet connectivity.
>
> PC1: eth0: 10.0.16.111 eth0:0 10.0.16.115 eth1: 192.168.100.10
> PC2: eth0: 10.0.16.113 eth1: 192.168.100.20
>
> 10.0.16.115 will be my VIP. Questions: Do I have to define
> eth0:0 in PC1 or just declaring it in haresources file is ok.
Don't understand this one, but it is enough to just put it in the
haresources.
> Now suppose if someone pulls the cable of say, eth0 / eth1 of
> PC1 then PC2 will take over, RIGHT?
That's what's called split brain, a very difficult thing to solve.
You want to make sure that there's always connectivity available
between the nodes. So, you put more than one connection.
> Now when PC2 takes over then it will start the services listed
> in this line masternode IPaddr::10.0.16.115 httpd
>
> So instead of httpd I will write a startup script of my own with
> lots of ipconfig command and iptables rules in that scripts
> Start and Stop function and put it in init.d location.
That's not an optimal approach, i.e. lumping various stuff
together in such a way will give everybody headache. If you really
need special resources which are _not_ already available (you
should check that), then implement only them in separate scripts.
Heartbeat will be happy to deal with multiple resources, so you
can do sth like:
masternode IPaddr::10.0.16.115 firewall mega-ip httpd
> The
> purpose of this is when PC2 takes over its IP will be changed to
> eth0: 10.0.16.113 and eth1: 192.168.100.10.
eth1? I don't see eth1 in resources.
> These IP s will be
> static IPs so I think no problem will arise. And Alan, sorry I
> couldn't make use of your that flash tutorial. Actually I didn't
> understood that clearly.
It was probably for v2 style configs.
> Waiting for your suggestions.
Always happy to help, but perhaps you should also invest some time
and read a few docs. You can start here:
http://linux-ha.org/GettingStartedWithHeartbeat
>
> Dejan Muhamedagic <[EMAIL PROTECTED]> wrote: On Wed, Mar 28, 2007 at
> 07:10:58AM -0700, Tanveer Chowdhury wrote:
> > hey thanks. The problem is I m not in the position to install any GUI to
> > setup this.
>
> You don't need to install a GUI on the cluster itself, just on
> your workstation, or any computer which would be able to access
> some cluster node on some TCP port.
>
> > Further I failed to match the link with my scenario. May be too
> > dumb to understand that.
>
> I didn't see what Alan prepared, but then I could well imagine
> that it does have something to do with where you're trying to get.
>
> > Anyway one thing also to ask if any
> > interface gets down but the services are ok on master then how
> > come the slave will take over?
>
> A network interface is a resource. A service (or what you presume
> to be a service) is also a resource. To heartbeat both are the
> same. A failing interface is the same as a failing service, i.e.
> it's a failed resource.
>
> > Alan Robertson wrote: Tanveer Chowdhury wrote:
> > > Hi all: Thank you for all your help and support. This is what I am
> > > going to do after reading carefully the documentation.
> > >
> > > Server PC will have 3 NICS and all three NICS with real IP. Only one
> > > NIC is aliased to support blocks of internal private network to
> > > access Internet. You already know what scenario I am trying to
> > > achieve here and also attached the document that I will follow with a
> > > little modification to server my purpose. My slave has also 3 NICS
> > > and will make an exact of IPs as it was in server when master server
> > > fails.
> > >
> > >
> > > Now my steps are as follows: As heartbeat only looks for services
> > > which can be start/stop using service command so I made a service
> > > script and put it in /etc/rc./init.d and it works. Below is the
> > > script: [b] #!/bin/sh # /etc/init.d/ha #
> > >
> > > #some things that run always touch /var/lock/ha
> > >
> > > #carry out specific functions when asked to by the system
> > >
> > > case "$1" in start) echo " starting ha script to Change IP of Slave"
> > > ifconfig eth0 192.168.100.11 netmask 255.255.255.0 up ...//all the ip
> > > change command will write here and also iptbales rules one by one ;;
> > >
> > > stop) echo " starting ha script to change IP back" # ifconfig eth0
> > > 192.168.100.10 netmask 255.255.255.0 up ...//change all the ip change
> > > command will write here and also iptbales rules one by one ;;
> > >
> > > *) echo "Usage:: /etc/init.d/ha {start | stop}" exit 1 ;; esac exit 0
> > > [/b]
> > >
> > > Now this script has all the IP configuration and will put this on
> > > both master and slave so when Master start it will set the IP as
> > > required and when master fails and stops the service then actually
> > > executes the stop fucntion and slave takes over the virtual IP and
> > > executes this script again setting the same IP configuration like
> > > master though initially slave had a diff IP settings than master. AM
> > > I right?
> > >
> > > What you think of this? Will this work or I m making some move ?
> > > Please let me know. Waiting for your kind response.
> >
> >
> > Why don't you just use our IPaddr resource that we already supply?
> >
> > Here's how to configure IPaddr (IPaddr2) using the GUI:
> > http://wiki.linux-ha.org/Education/Newbie/IPaddrScreencast
> >
> > Hope that helps...
> >
> > --
> > Alan Robertson
> >
> > "Openness is the foundation and preservative of friendship... Let me
> > claim from you at all times your undisguised opinions." - William
> > Wilberforce
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> >
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> --
> Dejan
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