[Systems] Freedom's root filesystem full

[Bernie Innocenti]

On 10/09/2014 04:04 AM, Sam P. wrote:
> Hi Bernie,
> 
> Sorry I took so long to get back to you!
> 
> On Tue, Sep 30, 2014 at 5:50 AM, Bernie Innocenti <bernie at codewiz.org
> <mailto:bernie at codewiz.org>> wrote:
> 
>     On 09/29/2014 03:10 AM, Sam P. wrote:
>     > Hi Bernie,
>     >
>     > On Sep 29, 2014 12:58 AM, "Bernie Innocenti" <bernie at codewiz.org <mailto:bernie at codewiz.org>
>     > <mailto:bernie at codewiz.org <mailto:bernie at codewiz.org>>> wrote:
>     >>
>     >> Hello Sam,
>     >>
>     >> is the stuff in /var/lib/docker2 still needed? The root filesystem is
>     >> almost full.
>     >
>     > No... I migrated all the stuff in the docker folder to a new partition
>     > by using that as temp folder... You can delete it.
> 
>     I recursively deleted everything under /var/lib/docker2, but there was
>     still an aufs mounted under /var/lib/docker2, and it looks like it was
>     still in use by docker! I unmounted it
> 
>     Can you please check that everything still works as intended?
> 
>     In case I accidentally deleted something live, we should be able to
>     recover it from our daily backup.
> 
> 
> It did get broken... but the data was stored separately so I just
> restarted the container
> 
>  
> 
> 
>     >> Also, the two filesystems you mounted for docker instances are not in
>     >> /etc/fstab. You might want to add them.
> 
> 
> Done!
>  
> 
>     >
>     > I will be away from my laptop for a while now, but I will do this ;)
> 
>     Ok.
> 
>     Another question: which docker package are we using on freedom? We seem
>     to be using lxc-docker-1.2.0, but there were leftover config files from
>     an older docker.io <http://docker.io> version 0.9.1. I purged them
>     to avoid confusion.
> 
> 
> Thanks
>  
> 
> 
> 
>     >> One last question: do we specifically need btrfs for snapshots or some
>     >> other feature? If not, I'd rather keep using ext4 exclusively on all
>     >> servers to reduce the number of kernel bugs we hit.
>     >
>     > I will move back to ext4.  The only reason I used btrfs was some
>     > magazine article praising it as the filesystem of the future.
> 
>     I've been following btrfs development for some 7 years, but it's been a
>     disappointment. It's not really... better. It's much slower than ext4
>     for common workloads and it's just barely starting to become stable now.
>     No distribution (other than Oracle's RHEL ripoff) made it the default,
>     and RHEL7 just switched to xfs, showing that RH is not interested in
>     btrfs.
> 
>     But btrfs has COW snapshots, which make it perfect for some
>     applications. Have you seen Lennart Poettering's b new package
>     management proposal?
> 
> 
> Cool, I see.  I don't use any of the fancy stuff.
> This is really dumb, but is there a tool for moving stuff between
> partitions (other than copying)?  Copying is messy :(

To copy a system along with all its metadata, I do:

   rsync -PHAXphax --numeric-ids --delete /path/to/src/ /path/to/dst/

Note that the leading slashes are important, and that some of the
options are redundant, but help make the command more memorable :-)

-- 
 _ // Bernie Innocenti
 \X/  http://codewiz.org