[petsc-users] osx error

[Mark Adams]

Oh you did not change my hostname:

07:37 master *= ~/Codes/petsc$ hostname
MarksMac-302.local
07:41 master *= ~/Codes/petsc$ ping -c 2 MarksMac-302.local
PING marksmac-302.local (127.0.0.1): 56 data bytes
Request timeout for icmp_seq 0

--- marksmac-302.local ping statistics ---
2 packets transmitted, 0 packets received, 100.0% packet loss
07:42 2 master *= ~/Codes/petsc$

BTW, I used to get messages about some network issue and 'changing host
name to MarksMac-[x+1].local'. That is, the original hostname
was MarksMac.local, then I got a message about changing
to MarksMac-1.local, etc. I have not seen these messages for months but
apparently this process has continued unabated.









On Thu, Sep 17, 2020 at 11:10 PM Satish Balay via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> 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
>
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