[no subject]

You can control machines getting what when with a config file they pull 
first. That's the way a bunch of stuff I've done has done it at least.

If you are feeling really ambitious though, you could try using other 
tools, like something based on cfengine or apt/yum/some other package 
management tool too.

Pushing the files you want to publish with ssh/scp is actually probably 
the least efficient way to do it of the ways discussed.

Mike


David Corbin wrote:
> On Friday 17 December 2004 12:14, Mike Murphy wrote:
> 
>>depending on what sort of stuff you are doing, how big any stuff you are
>>pushing is, and how fast the network links are, 10000+ nodes is a lot of
>>nodes to admin, no matter what the technique (but if you have 10000+
>>nodes, I'm sure you know that).
>>
>>I guess its all a question of what exactly you're up to. If you were to
>>try to ssh to each machine in series to do something (say echo "some
>>param" into /etc/somefile), you might still be surprised by how much
>>time that takes. Certainly, if you are thinking of ssh to replace some
>>other terminal-like administration solution, like doing stuff in scripts
>>over rsh, or over telnet with expect or something, its probably worth
>>the extra overhead of encryption for added security though.
>>
>>I can tell you that I've found that even fully managing about 900 hosts
>>has brought up some interesting problems. In this example, we use rsync
>>to keep various configuration files, etc. in sync accross all the hosts.
>>Once an hour, they each visit a dedicated rsync server to look for
>>updates. Even using rsync with a server (instead of rsync over ssh),
>>which is very efficient, we're starting to find that we might want to
>>inject a second tier here. So, it looks like this:
>>
>>master server -> n number of "staging" servers -> x number of working hosts
>>
> 
> 
> Actually, not all nodes are created equal.  Each site has it's own server 
> node, so it's quite possible and in  some ways desirable to do a two-tier 
> system.
> 
> What I failed to mention, is this is really about managing software upgrades 
> automatically.  It's not something that will happen on an every day basis.  
> Short of serious problems, it would probably be once a moneth at most.  Even 
> then, it would likely be staged: 1 site for 2 days.  10 sites.  25 sites.  
> 100, 250   the rest.

-- 

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