Re: [BackupPC-users] PingCmd no longer having effect

[Ian via BackupPC-users]

On 4/5/24 17:40, Les Mikesell wrote:

You can use $Conf{ClientNameAlias} to point multiple hosts to the same
IP (or a resolvable name).


Yes, this works so long as I override the RsyncSshArgs in the host 
config to include the correct port.


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Re: [BackupPC-users] PingCmd no longer having effect

[Mike Hughes]

Hi Ian,

I'm not sure why it would suddenly stop working for you as that seems like a 
completely legitimate solution.
FWIW, this is the command I use for unpingable clients:
$Conf{PingCmd} = '/bin/echo $host';

Best of luck!

From: Ian via BackupPC-users 
Sent: Friday, April 5, 2024 1:27 PM
To: backuppc-users@lists.sourceforge.net 
Cc: Ian 
Subject: [BackupPC-users] PingCmd no longer having effect

Hi,

I've been using BackupPC for many years now, and have used /usr/bin/true as the 
ping command for hosts that can't respond to ping.  However after a reboot on 
January 31st, my server stopped obeying pingcmd and stopped backing up those 
hosts due to lack of ping response.  I am using BackupPC 4.4.0-5ubuntu2 amd64 
on Ubuntu 22.04.

So far I have tried:

Overriding $Conf{PingCmd}, $Conf{PingPath}, and $Conf{Ping6Path} in the global 
config from webui and config file.

Setting  $Conf{PingCmd} in the client config to either /usr/bin/true or ping 
-c1 127.0.0.1 using webui and config file.

None of the above seem to make any difference at all anymore.  No matter what I 
set, I restart the service and get the same error:

2024-04-05 13:58:38 can't ping  (client = myclient.com); exiting


However I can confirm other changes to the client config files do have an 
effect.  For example setting a ClientNameAlias in the client config works.

I also tried deleting the client config file and allowing the webui to create 
it, and doing an apt-get --reinstall install backuppc.  Same effect.

I'm wondering if anyone has noticed anything similar, or has advice on how to 
debug.

Thanks,
Ian
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Re: [BackupPC-users] PingCmd no longer having effect

[Les Mikesell]

On Fri, Apr 5, 2024 at 3:56 PM Ian via BackupPC-users
 wrote:
>

> I guess this is my fault due to my setup.  I have several systems at a single 
> dynamic ip.  I have backupPC set up like so:

You can use $Conf{ClientNameAlias} to point multiple hosts to the same
IP (or a resolvable name).

-- 
 Les Mikesell
  lesmikes...@gmail.com


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Re: [BackupPC-users] PingCmd no longer having effect

[Kim Scarborough]

Just add everything you want to /etc/hosts on the backuppc server.

On 4/5/24 3:53 PM, Ian via BackupPC-users wrote:

Thank you!  You're completely right. When it says

2024-04-05 15:28:10 Can't find host myhost.com via NS and netbios
2024-04-05 15:28:10 can't ping  (client = myhost.com); exiting

It seems like the first line is the real failure, and the ping is 
never attempted.


Apologies for the list to cutting the log entry too short in my 
original post.


I guess this is my fault due to my setup.  I have several systems at a 
single dynamic ip.  I have backupPC set up like so:


host1.myhost.com
host2.myhost.com
host3.myhost.com
...

The backuppc user's ssh config file has each of those hosts configured 
with different ports:


Host host1.myhost.com
  Hostname myhost.com
  Port 1
  User root

Host host2.myhost.com
  Hostname myhost.com
  Port 2
  User root

Host host3.myhost.com
  Hostname myhost.com
  Port 3
  User root

...

This way the backuppc user can ssh host3.myhost.com and be logged in 
to the proper system automatically.


I guess now my goal is to find out how to make backuppc bypass the dns 
check, or to check myhost.com instead of hostx.myhost.com.


Though perhaps I'm way off base and there's a better way of 
configuring all of this.


Ian


On 4/5/24 16:14, Robert Trevellyan wrote:
Unless I'm missing something, this seems to be important: 2024-04-05 
15:28:10 Can't find host myhost.com  via NS and 
netbios


Have you tried adding an entry to your hosts file just to get past 
this and allow further troubleshooting?


Robert Trevellyan


On Fri, Apr 5, 2024 at 3:45 PM Ian via BackupPC-users 
 wrote:


On 4/5/24 15:25, to...@tuxteam.de wrote:
> On Fri, Apr 05, 2024 at 02:27:55PM -0400, Ian via
BackupPC-users wrote:
>> Hi,
>>
>> I've been using BackupPC for many years now, and have used
/usr/bin/true as
>> the ping command [...]
> Are you sure it's supposed to be /usr/bin/true and not just
/bin/true?
>
> Cheers

Pretty sure, 'which true' returns '/usr/bin/true'.  Though, on my
system
true also exists at /bin/true, so I tried that as well just now. 
Same
result.

I've also tried placing scripts in the PingCmd field and they do not
appear to execute.

Thanks,
Ian


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Re: [BackupPC-users] PingCmd no longer having effect

[Ian via BackupPC-users]

Thank you!  You're completely right. When it says

   2024-04-05 15:28:10 Can't find host myhost.com via NS and netbios
   2024-04-05 15:28:10 can't ping  (client = myhost.com); exiting

It seems like the first line is the real failure, and the ping is never 
attempted.


Apologies for the list to cutting the log entry too short in my original 
post.


I guess this is my fault due to my setup.  I have several systems at a 
single dynamic ip.  I have backupPC set up like so:


   host1.myhost.com
   host2.myhost.com
   host3.myhost.com
   ...

The backuppc user's ssh config file has each of those hosts configured 
with different ports:


   Host host1.myhost.com
  Hostname myhost.com
  Port 1
  User root

   Host host2.myhost.com
  Hostname myhost.com
  Port 2
  User root

   Host host3.myhost.com
  Hostname myhost.com
  Port 3
  User root

   ...

This way the backuppc user can ssh host3.myhost.com and be logged in to 
the proper system automatically.


I guess now my goal is to find out how to make backuppc bypass the dns 
check, or to check myhost.com instead of hostx.myhost.com.


Though perhaps I'm way off base and there's a better way of configuring 
all of this.


Ian


On 4/5/24 16:14, Robert Trevellyan wrote:
Unless I'm missing something, this seems to be important: 2024-04-05 
15:28:10 Can't find host myhost.com  via NS and 
netbios


Have you tried adding an entry to your hosts file just to get past 
this and allow further troubleshooting?


Robert Trevellyan


On Fri, Apr 5, 2024 at 3:45 PM Ian via BackupPC-users 
 wrote:


On 4/5/24 15:25, to...@tuxteam.de wrote:
> On Fri, Apr 05, 2024 at 02:27:55PM -0400, Ian via BackupPC-users
wrote:
>> Hi,
>>
>> I've been using BackupPC for many years now, and have used
/usr/bin/true as
>> the ping command [...]
> Are you sure it's supposed to be /usr/bin/true and not just
/bin/true?
>
> Cheers

Pretty sure, 'which true' returns '/usr/bin/true'.  Though, on my
system
true also exists at /bin/true, so I tried that as well just now. 
Same
result.

I've also tried placing scripts in the PingCmd field and they do not
appear to execute.

Thanks,
Ian


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Re: [BackupPC-users] PingCmd no longer having effect

[backuppc--- via BackupPC-users]

Ian via BackupPC-users  wrote:

> the PingCmd field

The documentation suggests to alter PingPath rather than PingCmd:
https://backuppc.github.io/backuppc/BackupPC.html#_conf_pingpath_

Fabian


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Re: [BackupPC-users] PingCmd no longer having effect

[Robert Trevellyan]

Unless I'm missing something, this seems to be important: 2024-04-05
15:28:10 Can't find host myhost.com via NS and netbios

Have you tried adding an entry to your hosts file just to get past this and
allow further troubleshooting?

Robert Trevellyan


On Fri, Apr 5, 2024 at 3:45 PM Ian via BackupPC-users <
backuppc-users@lists.sourceforge.net> wrote:

> On 4/5/24 15:25, to...@tuxteam.de wrote:
> > On Fri, Apr 05, 2024 at 02:27:55PM -0400, Ian via BackupPC-users wrote:
> >> Hi,
> >>
> >> I've been using BackupPC for many years now, and have used
> /usr/bin/true as
> >> the ping command [...]
> > Are you sure it's supposed to be /usr/bin/true and not just /bin/true?
> >
> > Cheers
>
> Pretty sure, 'which true' returns '/usr/bin/true'.  Though, on my system
> true also exists at /bin/true, so I tried that as well just now.  Same
> result.
>
> I've also tried placing scripts in the PingCmd field and they do not
> appear to execute.
>
> Thanks,
> Ian
>
>
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>
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Re: [BackupPC-users] PingCmd no longer having effect

[tomas]

On Fri, Apr 05, 2024 at 02:27:55PM -0400, Ian via BackupPC-users wrote:
> Hi,
> 
> I've been using BackupPC for many years now, and have used /usr/bin/true as
> the ping command [...]

Are you sure it's supposed to be /usr/bin/true and not just /bin/true?

Cheers
-- 
t


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Re: [BackupPC-users] PingCmd no longer having effect

[Ian via BackupPC-users]

On 4/5/24 15:25, to...@tuxteam.de wrote:

On Fri, Apr 05, 2024 at 02:27:55PM -0400, Ian via BackupPC-users wrote:

Hi,

I've been using BackupPC for many years now, and have used /usr/bin/true as
the ping command [...]

Are you sure it's supposed to be /usr/bin/true and not just /bin/true?

Cheers


Pretty sure, 'which true' returns '/usr/bin/true'.  Though, on my system 
true also exists at /bin/true, so I tried that as well just now.  Same 
result.


I've also tried placing scripts in the PingCmd field and they do not 
appear to execute.


Thanks,
Ian


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Re: [BackupPC-users] PingCmd no longer having effect

[Ian via BackupPC-users]

On 4/5/24 14:52, Mike Hughes wrote:

$Conf{PingCmd} = '/bin/echo $host';


Thanks for the idea, unfortunately same result.

   2024-04-05 15:28:10 Can't find host myhost.com via NS and netbios
   2024-04-05 15:28:10 can't ping  (client = myhost.com); exiting

I also tried this

   $Conf{PingCmd} = '/var/lib/backuppc/test.sh';

Where test.sh is +x and contains

   #!/usr/bin/bash
   echo `/usr/bin/date` >> /var/lib/backuppc/testlog.txt

After restarting backuppc (and the whole server for good measure, since 
this problem is starting to feel weird), I tried backing up that host.  
No output in the text file.


However using sudo to execute the file as backuppc user works as expected.

Ian
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[BackupPC-users] PingCmd no longer having effect

[Ian via BackupPC-users]

Hi,

I've been using BackupPC for many years now, and have used /usr/bin/true 
as the ping command for hosts that can't respond to ping.  However after 
a reboot on January 31st, my server stopped obeying pingcmd and stopped 
backing up those hosts due to lack of ping response.  I am using 
BackupPC 4.4.0-5ubuntu2 amd64 on Ubuntu 22.04.


So far I have tried:

Overriding $Conf{PingCmd}, $Conf{PingPath}, and $Conf{Ping6Path} in the 
global config from webui and config file.


Setting  $Conf{PingCmd} in the client config to either /usr/bin/true or 
ping -c1 127.0.0.1 using webui and config file.


None of the above seem to make any difference at all anymore.  No matter 
what I set, I restart the service and get the same error:


   2024-04-05 13:58:38 can't ping  (client = myclient.com); exiting

However I can confirm other changes to the client config files do have 
an effect.  For example setting a ClientNameAlias in the client config 
works.


I also tried deleting the client config file and allowing the webui to 
create it, and doing an apt-get --reinstall install backuppc. Same effect.


I'm wondering if anyone has noticed anything similar, or has advice on 
how to debug.


Thanks,
Ian___
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