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Charles Chan ed6c3923f9 Touch up Node.js and MongoDB examples

- Remove extraneous '-' in sudo note.
- Correct space formatting (minor).
- Simplify instructions for install EPEL and install with yum directly.
- Add `nodejs` to yum install list explicitly to match the comments -- more transparent for new users who might not be clear `npm` package also installs `nodejs`.
- Remove '--noprealloc` from MongoDB example as the option has been depcated since Mongo 2.6 and is now the default behaviour. See: http://docs.mongodb.org/manual/reference/program/mongod/

Signed-off-by: Charles Chan <charleswhchan@users.noreply.github.com>
Upstream-commit: 549c8ea96eb036d60e3c9eea1ed8eb2d817e885a
Component: engine

2015-09-06 14:34:54 -07:00

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Dockerizing a CouchDB service

Note

: If you don't like sudo then see Giving non-root access

Here's an example of using data volumes to share the same data between two CouchDB containers. This could be used for hot upgrades, testing different versions of CouchDB on the same data, etc.

Create first database

Note that we're marking /var/lib/couchdb as a data volume.

$ COUCH1=$(docker run -d -p 5984 -v /var/lib/couchdb shykes/couchdb:2013-05-03)

Add data to the first database

We're assuming your Docker host is reachable at localhost. If not, replace localhost with the public IP of your Docker host.

$ HOST=localhost
$ URL="http://$HOST:$(docker port $COUCH1 5984 | grep -o '[1-9][0-9]*$')/_utils/"
$ echo "Navigate to $URL in your browser, and use the couch interface to add data"

Create second database

This time, we're requesting shared access to $COUCH1's volumes.

$ COUCH2=$(docker run -d -p 5984 --volumes-from $COUCH1 shykes/couchdb:2013-05-03)

Browse data on the second database

$ HOST=localhost
$ URL="http://$HOST:$(docker port $COUCH2 5984 | grep -o '[1-9][0-9]*$')/_utils/"
$ echo "Navigate to $URL in your browser. You should see the same data as in the first database"'!'

Congratulations, you are now running two Couchdb containers, completely isolated from each other except for their data.

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