I'm not worried about down time.
I'm strictly worrying about backing up:
/home and /usr/local/mysql/var
On server 1 and
/home and /var/mail
On Server 2.
Thats it.
Any ideas? Thanks!
-Matt
On Mon, 2003-12-29 at 22:48, anubis wrote:
> On Sat, 27 Dec 2003 03:30 am, samy lancher wrote:
> > Hello all,
> > I have a 4.5 FreeBSD server. It is our Email, web and database server. I
> > would like to setup a backup server so that when the main server goes down
> > the backup server takes over its job. Could some one please tell me the
> > best way to setup a backup server and also suggest some good documentation.
> >
> > Thanks in advance,
> > Naveen.
> >
> >
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>
> I have had a bit of a look into this myself and this is my take on it. I
> would like to hear of other people experiences too.
>
> There are a number of things that you have to decide on first before you go
> any further.
>
> These are:
> budget
> how critical the system is to downtime
> how much data you are willing to lose
> how long are you willing to wait for the second system to kick in.
> These will determine how you are going to build your system. You will have to
> keep the answers in mind when you are looking at any solution.
>
> What you seem to be looking for is a failover system. There is a fair bit
> written about failover systems. Googling will find you lots. Make sure that
> you look up linux high availability and failover as well to get a broader
> view. I have added some links below.
>
> There is really 2 things that you are trying to do here. Provide redundancy
> for the services and redundancy for the data. The services are a bit easier
> and cheaper than the data. The big problem is the data, especially
> databases. Due to their nature they cant easily be copied while live.
>
> A solution to this is a SAN. With lots of money it is easier as you can buy
> yourself a SAN and hook the two machines to it and host the data on the SAN.
> With some clever scripts from those HA sites when one machine goes down the
> other can take over and use the same data. There are other solutions using a
> fancy Y shaped SCSI cable to a external drive array. Others my be able to
> help here as I dont know about them.
>
> The other alternative is 2 identical machines.
> When you have 2 machines with the master storing data on its local drives it
> gets tricker. This is where you have to decide on how much data you are
> willing to lose.
>
> As an example we have a bsd box that rsyncs our windows fileserver ever hour.
> Should windas go down we run a script on the workstations remapping our
> drives to the bsd box. In this case we are prepared to lose up to an hours
> work. We are also prepared to lose say 15-30 minutes of time mucking around.
>
> In your situation perhaps what you could do is upgrade to 5.1 and rsync
> snapshots of your data to the secondary machine. You could use the failover
> setup as described on HA sites to fire up the services on the secondary
> machine and take over. This should work as snapshots are supposed to capture
> an instant in time but I couldnt guarantee it until I tested it. You would
> still be losing data as you could only snapshot data and transfer it in
> discrete intervals.
>
> A handy thing that linux has that I dont think that freebsd has is drbd. This
> is a block device that can mirror data across a network. If freebsd had this
> it would be easy to make the second machine a true mirror of the first.
> I wonder if they are looking at a thing similar to this in the future.
>
> Look here for some intersting reading
>
> http://linux-ha.org/
> http://www.drbd.org/
> http://sporner.dnsalias.org/
> http://failover.othello.ch/getting_started.html
>
>
>
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