added instructions to use a central mongodb in docker env

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diff --git a/_posts/2017-03-07-use-central-mongodb-in-docker-environment.md b/_posts/2017-03-07-use-central-mongodb-in-docker-environment.md
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+---
+layout: post
+title: "Use a central mongodb in docker environment for differrent services"
+description: ""
+category: Installation
+tags: [Docker, Mongodb, Database]
+---
+{% include JB/setup %}
+
+
+**download and run the mongodb**
+
+    docker pull mongo
+    docker run --name central-mongo -d mongo
+
+**you can define the storage engine by name**
+
+    docker run --name central-mongo -d mongo --storageEngine wiredTiger
+
+**start your service and link the mongodb to it**
+
+    docker run --name my-service --link central-mongo:mongodb -d insilicotox/my-service
+
+**enter your service container and check the central mongodb network adress**
+
+    docker exec -ti my-service bash
+    cat /etc/hosts  -> 172.17.x.x mongodb
+    env|grep MONGODB  -> MongoPort = tcp://172.17.x.x:27017
+
+**use this port for your mongo commands e.g.**
+
+    `mongorestore --host 172.17.x.x`