On Fri, Sep 18, 2020 at 7:51 AM Matthew Knepley <knep...@gmail.com> wrote:
> On Fri, Sep 18, 2020 at 7:46 AM Mark Adams <mfad...@lbl.gov> wrote: > >> 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$ >> > > This does not make sense to me. You have > > 127.0.0.1 MarksMac-302.local > > in /etc/hosts, > 09:07 ~/.ssh$ cat /etc/hosts ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost 127.0.0.1 MarksMac-5.local 127.0.0.1 243.124.240.10.in-addr.arpa.private.cam.ac.uk 127.0.0.1 MarksMac-302.local 09:07 ~/.ssh$ > but you cannot resolve that name? > > Matt > > >> 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@mcs.anl.gov> wrote: >> >>> On Thu, 17 Sep 2020, Matthew Knepley wrote: >>> >>> > On Thu, Sep 17, 2020 at 8:33 PM Barry Smith <bsm...@petsc.dev> wrote: >>> > >>> > > > On Sep 17, 2020, at 4:59 PM, Satish Balay via petsc-users < >>> > > petsc-users@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 >>> >> > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > https://www.cse.buffalo.edu/~knepley/ > <http://www.cse.buffalo.edu/~knepley/> >
