New juju-mongodb package

[roger peppe]

On 2 December 2013 12:48, John Arbash Meinel <john at arbash-meinel.com> wrote:
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> On 2013-12-02 16:39, roger peppe wrote:
>> On 2 December 2013 11:40, Ian Booth <ian.booth at canonical.com>
>> wrote:
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>>>>
>>>> I don't fully understand the difference from mongoexport vs
>>>> mongodump (it looks like dump generates a binary snapshot
>>>> compatible with restore, while export/import generate text
>>>> representations of the data.)
>>>>
>>>> I'd *really* like us to stick with *one* of them as the
>>>> recommended method for backing up the content.
>>>>
>>>
>>> Both export and dump are used by the Juju backup tool. dump is
>>> used to do a full bson export of the database and is required for
>>> a database recovery. export is used to write to json the
>>> environment settings document so that there is a human readable
>>> copy of the full environment settings contained in the backup
>>> tarball.
>>
>> ISTM that the mongo command could be used to similar effect, as
>> John suggests, couldn't it? Then we would not need mongexport at
>> all.
>>
>
> For what we are using this page:
>
> http://stackoverflow.com/questions/11255630/how-to-export-all-collection-in-mongodb
>
> has something like:
>   mongo --eval 'printjson(db.getCollectionNames())'
>
> We can easily change the internal one to something like
> db.find('session') or whatever it needs to be.
>
> Now, we wouldn't need 'mongo' otherwise, but I think if we have to
> pick a tool 'mongo' is more generally useful, and it doesn't bundle v8
> so it is a smaller binary as well.

We will probably use the mongo command for restoring,
and may use it for backing up if that's a convenient way
to use fsyncLock to avoid taking down the whole
system for backing up.

And it's potentially useful for escaping awkward situations
too, so I'm definitely in favour of its inclusion.

Which brings us to {mongod, mongo, mongodump, mongorestore}
as the set of executables that we'd like to have, I think.

  cheers,
    rog.