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Mongo Charm

Quick information
- Upgrade
- General Access

Quick information

Upgrade

Since 4.0.6 based on alpine 3.9, alpine is not packaging mongo anymore. So we use the official version (that is huge). We still must change entrypoint to enforce proper directory paths.

A ``Dockerfile`` is provided for this mean.

You can fetch latest official tags:

docker-tags-fetch mongo -l 10 -f '^[0-9]+\.[0-9]+\.[0-9]+$'

change it in docker file, then

docker build . -t docker.0k.io/mongo:"$TAG"-myc

General Access

You can access mondo db, if running, through

SERVICENAME=mongo
compose exec "$SERVICENAME" /usr/bin/mongo --quiet --eval "some js code"

if not running, you might want to run it.

The following could be added to actions

list databases

SERVICENAME=mongo
compose exec -T mongo /usr/bin/mongo --quiet \
    --eval "JSON.stringify(db.adminCommand({listDatabases: 1}))" | \
    jq -r '.databases[] | .name'

Dump database

This one will use the probably already builded image from your project on your host to run a competing mongo with a host directory to store the dump.

PROJECTNAME=myc
SERVICENAME=mongo
docker run --rm --name mongo_client -ti \
     -v /tmp/mongo:/tmp/mongo --network "${PROJECTNAME}_default" \
     -u root \
     --entrypoint /bin/sh "${PROJECTNAME}_$SERVICENAME"

Then inside docker:

apk add mongodb-tools

Then for each databases:

DBNAME="xxx"
cd /tmp/mongo
mongodump -h mongo -d "$DBNAME" -o mdump/

Drop database

DBNAME=xxx
PROJECTNAME=myc
SERVICENAME=mongo
docker exec -i "${PROJECTNAME}_${SERVICE}_1" /usr/bin/mongo --quiet < \
    <(echo "
use $DBNAME;
db.dropDatabase();
")

Note: if some connection are active to the database, it might not be deleted, you should check by relisting the database.

Restore database

SOURCE_DIR=/tmp/gogocarto
docker run --rm -ti \
    -v "$SOURCE_DIR":/tmp/backups/gogocarto \
    -w /tmp/backups \
    --entrypoint mongorestore \
    --network myc_default \
    myc_mongo \
    --host rs01/mongo /tmp/backups/

There should not have any errors.

Please note that '/tmp/backups' in the last example should contain one directory per database.

Note also that you should drop database (see previous section) prior to restore them.

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