[petsc-users] osx error

[Satish Balay]

On Thu, 17 Sep 2020, Matthew Knepley wrote:

> On Thu, Sep 17, 2020 at 8:33 PM Barry Smith <bsmith at petsc.dev> wrote:
> 
> > > On Sep 17, 2020, at 4:59 PM, Satish Balay via petsc-users <
> > petsc-users at mcs.anl.gov> wrote:
> > >
> > > Here is a fix:
> > >
> > > echo 127.0.0.1 `hostname` | sudo tee -a /etc/hosts
> >
> >  Satish,
> >
> >    I don't think you want to be doing this on a Mac (on anything?) On a
> > Mac based on the network configuration etc as it boots up and as networks
> > are accessible or not (wi-fi) it determines what hostname should be, one
> > should never being hardwiring it to some value.
> >
> 
> Satish is just naming the loopback interface. I did this on all my former
> Macs.


Yes - this doesn't change the hostname. Its just adding an entry for gethostbyname - for current hostname.

>>>
127.0.0.1 MarksMac-302.local
<<<

Sure - its best to not do this when one has a proper IP name [like foo.mcs.anl.gov] - but its useful when one has a hostname like "MarksMac-302.local" -that is not DNS resolvable

Even if the machine is moved to a different network with a different name - the current entry won't cause problems [but will need another entry for the new host name - if this new name is also not DNS resolvable]

Its likely this file is a generated file on  macos  - so might get reset on reboot - or some network change? [if this is the case - the change won't be permanent]


Satish