Re: [BackupPC-users] Why ping before backup?
For an rsyncd client, the "rsync $host::" suggestion seems like an excellent idea. Its exit status appears to be correct (0 on success), and as you point out it is confirming the desired service is actually available. Craig On Sat, Aug 10, 2019 at 6:07 PM Kenneth Porter wrote: > On 8/10/2019 9:50 AM, Alexander Kobel wrote: > > IMHO the only reason why one might want to replace the ping command is > > hosts that don't reply to pings for security reasons > > I'm thinking that "rsync $host::" would be a good substitute for an > rsyncd backup because it preloads the executable on the client into its > disk cache and verifies that the service, not the host, is up and > accessible. > > I set up a new Win10 client the other day and forgot to open the > firewall to ping when I opened it to rsync.exe. I mostly work from home > so fixing that means I have to coordinate with the user to meet him when > he's at the office and not busy using the host. It's just easier to > change the ping setting. And, since Windows defaults to disallowing > ping, perhaps this change is a good choice for all Windows rsyncd clients. > > > > > ___ > BackupPC-users mailing list > BackupPC-users@lists.sourceforge.net > List:https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki:http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ > ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
Re: [BackupPC-users] Why ping before backup?
On 8/10/2019 9:50 AM, Alexander Kobel wrote: IMHO the only reason why one might want to replace the ping command is hosts that don't reply to pings for security reasons I'm thinking that "rsync $host::" would be a good substitute for an rsyncd backup because it preloads the executable on the client into its disk cache and verifies that the service, not the host, is up and accessible. I set up a new Win10 client the other day and forgot to open the firewall to ping when I opened it to rsync.exe. I mostly work from home so fixing that means I have to coordinate with the user to meet him when he's at the office and not busy using the host. It's just easier to change the ping setting. And, since Windows defaults to disallowing ping, perhaps this change is a good choice for all Windows rsyncd clients. ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
Re: [BackupPC-users] Why ping before backup?
On 09.08.19 07:08, Michael Huntley wrote: > It’s simply to check if the host is answering. Yup. > I use ‘echo’ IIUC, you use a command that always returns true (coincidentally, the canonical choice for that command is `true`... ;-))? This means that (1) blackouts won't work as expected (note that pings are done even when no backup is due, to log whether this is a "always-on host"), and (2) that no matter whether the server is reachable or not, for any wakeup moment when a new backup is due, the host's backup tree will be copied over to the new "working tree" and immediately discarded again if the host couldn't be reached. (2) is merely an issue with the server load; (1) actually changes the "semantics" and could mean that backups are skipped because the host is considered always-on, but isn't. IMHO the only reason why one might want to replace the ping command is hosts that don't reply to pings for security reasons, or hosts where the hostname addressing is non-trivial (e.g., SSH via proxies specified in ~backuppc/.ssh/config). For both situations, and assuming SSH is used, sshping is an excellent replacement for ping; see https://github.com/spook/sshping and my very recent pull request https://github.com/spook/sshping/pull/16, which was made with BackupPC in mind... A pity that I found it only a couple of days ago myself... Cheers, Alex >> On Aug 8, 2019, at 10:05 PM, Kenneth Porter wrote: >> >> Why does BackupPC ping the host to be backed up before starting its backup. >> (I'm using rsyncd.) I'm thinking of replacing the ping command with "rsync >> $host::". Is there any downside to that? >> >> >> >> ___ >> BackupPC-users mailing list >> BackupPC-users@lists.sourceforge.net >> List:https://lists.sourceforge.net/lists/listinfo/backuppc-users >> Wiki:http://backuppc.wiki.sourceforge.net >> Project: http://backuppc.sourceforge.net/ >> > > > > ___ > BackupPC-users mailing list > BackupPC-users@lists.sourceforge.net > List:https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki:http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ > smime.p7s Description: S/MIME Cryptographic Signature ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
Re: [BackupPC-users] Why ping before backup?
It’s simply to check if the host is answering. I use ‘echo’ Cheers, mph > On Aug 8, 2019, at 10:05 PM, Kenneth Porter wrote: > > Why does BackupPC ping the host to be backed up before starting its backup. > (I'm using rsyncd.) I'm thinking of replacing the ping command with "rsync > $host::". Is there any downside to that? > > > > ___ > BackupPC-users mailing list > BackupPC-users@lists.sourceforge.net > List:https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki:http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ > ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
[BackupPC-users] Why ping before backup?
Why does BackupPC ping the host to be backed up before starting its backup. (I'm using rsyncd.) I'm thinking of replacing the ping command with "rsync $host::". Is there any downside to that? ___ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List:https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki:http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
