Myujth

I am completely new to docker. I followed this instruction to install mongodb chart and docker.

When I connect to 172.17.0.1, it said

Unable to connect to MongoDB using the specified URI.

The following error was returned while attempting to connect: 
MongoNetworkError: failed to connect to server [172.17.0.1:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 172.17.0.1:27017]

The result from pinging the specified server "172.17.0.1" from within the container is:
PING 172.17.0.1 (172.17.0.1) 56(84) bytes of data.
64 bytes from 172.17.0.1: icmp_seq=1 ttl=64 time=0.050 ms

--- 172.17.0.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.050/0.050/0.050/0.000 ms

The mongodb is running on local machine. I think it is not running in the container (not sure) because I installed mongodb in my machine before I install docker.

I have also checked the setting by using docker network inspect bridge

"Config": [
 
 "Subnet": "172.17.0.0/16",
 "Gateway": "172.17.0.1"
 
 ]

This is the yml file:

version: "3.3"

services:
 charts:
 image: quay.io/mongodb/charts:v0.10.0
 hostname: charts
 ports:
 # host:container port mapping. If you want MongoDB Charts to be
 # reachable on a different port on the docker host, change this
 # to <port>:80, e.g. 8888:80.
 - 80:80
 - 443:443
 volumes:
 - keys:/mongodb-charts/volumes/keys
 - logs:/mongodb-charts/volumes/logs
 - db-certs:/mongodb-charts/volumes/db-certs
 - web-certs:/mongodb-charts/volumes/web-certs
 environment:
 # The presence of following 2 environment variables will enable HTTPS on Charts server.
 # All HTTP requests will be redirected to HTTPS as well.
 # To enable HTTPS, upload your certificate and key file to the web-certs volume,
 # uncomment the following lines and replace with the names of your certificate and key file.
 # CHARTS_HTTPS_CERTIFICATE_FILE: charts-https.crt
 # CHARTS_HTTPS_CERTIFICATE_KEY_FILE: charts-https.key

 # This environment variable controls the built-in support widget and
 # metrics collection in MongoDB Charts. To disable both, set the value
 # to "off". The default is "on".
 CHARTS_SUPPORT_WIDGET_AND_METRICS: "on"
 # Directory where you can upload SSL certificates (.pem format) which
 # should be considered trusted self-signed or root certificates when
 # Charts is accessing MongoDB servers with ?ssl=true
 SSL_CERT_DIR: /mongodb-charts/volumes/db-certs
 networks:
 - backend
 secrets:
 - charts-mongodb-uri

networks:
 backend:

volumes:
 keys:
 logs:
 db-certs:
 web-certs:

secrets:
 charts-mongodb-uri:
 external: true

How can I connect to the mongodb?

Assuming you know how to use echo "mongodb://<username>:<password>@myhost.com/" | docker secret create charts-mongodb-uri - to create the connection the url.

The problem is actually how to connect from a docker container to a outside service running on the host machine. You can use some help from plenty of questions like From inside of a Docker container, how do I connect to the localhost of the machine?

Basically, if you are using docker for mac or windows, use something like echo "mongodb://host.docker.internal" | docker secret create charts-mongodb-uri -, for linux see https://docs.mongodb.com/charts/master/installation/ section RUNNING METADATA DATABASE ON LOCALHOST for the doc, or just use host mode (remove ports section)

version: "3.3"
services:
 charts:
 image: quay.io/mongodb/charts:v0.10.0
 hostname: charts
 network_mode: "host"
 ...