Hi Alexandre,

> [...]
> Jan 27 08:32:19 zen s3ql:     raise HostnameNotResolvable(address[0])
> Jan 27 08:32:19 zen s3ql: dugong.HostnameNotResolvable: Host
> ideiao.commondatastorage.googleapis.com does not have any ip addresses
> Jan 27 08:33:43 zen s3ql: Unmounting file system...
>
> it seems that at 08:32:19 the internet connection went down, or the
> dns server went down (google dns servers, by the way), and s3ql crashed.
> [...]
S3QL can in some circumstances generate a lot of parallel DNS requests*.
On one occasion my system generated so many requests per second that
Google's DNS temporarily rejected  DNS requests from my IP. That
resulted in a S3QL crash as you have experienced.
To workaround that crash reason, I installed Unbound
(https://unbound.net/) locally. Since then (~ 3 months ago) I did not
have that problem anymore.

On Ubuntu all you need to do is
$ sudo apt-get install unbound
to install and activate unbound.


* = As far as I know, every fresh HTTP Connection results in a DNS
request, and because of issue #178
(https://bitbucket.org/nikratio/s3ql/issues/178) there are ~1000
requests per second on my machine

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