I setting up a project using docker, nodejs and mongodb. Here is my configuration: https://github.com/tuanna2704/docker-express/blob/master/docker-compose.yml
after I run
docker-compose up
And I can access to http://localhost:4000 via my real machine but application cannot access to db container. Im newbie docker. Any one can explain for me reason why? Thanks a lot!
Check mongo client mongodb://localhost:27017/ working status after
docker-compose up in your local machine; If it works, then mongodb://mongo:27017/ should be fine
Better add tags in the image name image: mongo:latest
Related
I had never used PostgreSQL nor Docker before. I set up an already developed project that uses these two technologies in order to modify it.
To get the project running on my Linux (Pop!_OS 20.04) machine I was given these instructions (sorry if this is irrelevant but I don't know what is important and what is not to state my problem):
Installed Docker CE and Docker Compose.
Cloned the project with git and ran the commands git submodule init and git submodule update.
Initialized the container with: docker-compose up -d
Generated the application configuration file: ./init.sh
After all of that the app was available at http://localhost:8080/app/ and I got inside the project's directory the following subdirectories:
And inside dbdata:
Now I need to modify the DB and there's where the difficulty arose since I don't know how to set up the connection with PostgreSQL inside Docker.
In a project without Docker which uses MySQL I would
Create the local project's database "dbname".
Import the project's DB: mysql -u username -ppassword dbname < /path/to/dbdata.sql
Connect a DB client (DBeaver in my case) to the local DB and perform the necessary modifications.
In an endeavour to do something like that with PostgeSQL, I have read that I need to
Install and configure Ubuntu 20.04 serve.
Install PostgreSQL.
Configure Postgres “roles” to handle authentication and authorization.
Create a new Database.
And then what?
How can I set up the connection in order to be able to modify the DB from DBeaver and see the changes reflected on http://localhost:8080/app/ when Docker is involved?
Do I really need an Ubuntu server?
Do I need other program than psql to connect to Postgres from the command line?
I have found many articles related to the local setup of PostgreSQL with Docker but all of them address the topic from scratch, none of them talk about how to connect to the DB of an "old" project inside Docker. I hope someone here can give directions for a newbie on what to do or recommend an article explaining from scratch how to configure PostgreSQL and then connecting to a DB in Docker. Thanks in advance.
Edit:
Here's the output of docker ps
You have 2 options to get into known waters pretty fast:
Publish the postgres port on the docker host machine, install any postgres client you like on the host and connect to the database hosted in the container as you would have done this traditionally. You will use localhost:5433 to reach the DB. << Update: 5433 is the port where the postgres container is published on you host, according to the screenshot.
Another option is to add another service in your docker-compose file to host the client itself in a container.
Here's a minimal example in which I am launching two containers: the postgres and an adminer that is exposed on the host machine on port 9999.
version: '3'
services:
db:
image: postgres
restart: always
environment:
POSTGRES_PASSWORD: example
adminer:
image: adminer
restart: always
ports:
- 9999:8080
then I can access the adminer at localhost:9999 (password is example):
Once I'm connected to my postgres through adminer, I can import and execute any SQL query I need:
A kind advice is to have a thorough lecture to understand how the data is persisted in a Docker context. Performance and security are also topics that you might want to add under your belt as a novice in the field better sooner than later.
If you're running your PostgreSQL container inside your own machine you don't need anything else to connect using a database client. That's because to the host machine, all the containers are accessible using their own subnet.
That means that if you do this:
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' 341164c5050f`
it will output a list of IPs that you can configure in your DBeaver to access the container instance directly.
If you're not fond of doing that (or you prefer to use cli) you can always use the psql inside the installation of the PostgreSQL container to achieve something like you described in mysql point nº2:
docker exec -i 341164c5050f bash -c 'psql -U $POSTGRES_USER' < /path/to/your/schema.sql
It's important to inform the -i, otherwise it'll not read the schema from the stdin. If you're looking for psql in the interactive mode, use -it instead.
Last but not least, you can always edit the docker-compose.yml file to export the port and connect to the instance using the public IP/loopback device.
I am working on golang project, recently I read about docker and try to use docker with my app. I am using mongoDB for database.
Now problem is that, I am creating Dockerfile to install all packages and compile and run the go project.
I am running mongo data as locally, if I am running go program without docker it gives me output, but if I am using docker for same project (just installing dependencies with this and running project), it compile successfully but not gives any output, having error::
CreateSession: no reachable servers
my Dockerfile::
# Start from a Debian image with the latest version of Go installed
# and a workspace (GOPATH) configured at /go.
FROM golang
WORKDIR $GOPATH/src/myapp
# Copy the local package files to the container's workspace.
ADD . /go/src/myapp
#Install dependencies
RUN go get ./...
# Build the installation command inside the container.
RUN go install myapp
# Run the outyet command by default when the container starts.
ENTRYPOINT /go/bin/myapp
# Document that the service listens on port 8080.
EXPOSE 8080
EXPOSE 27017
When you run your application inside Docker, it's running in a virtual environment; It's just like another computer but everything is virtual, including the network.
To connect your container to the host, Docker gives it an special ip address and give this ip an url with the value host.docker.internal.
So, assuming that mongo is running with binding on every interface on the host machine, from the container it could be reached with the connection string:
mongodb://host.docker.internal:21017/database
Simplifying, Just use host.docker.internal as your mongodb hostname.
In your golang project, how do you specify connection to mongodb? localhost:27017?
If you are using localhost in your code, your docker container will be the localhost and since you don't have mongodb in the same container, you'll get the error.
If you are starting your docker with command line docker run ... add --network="host". If you are using docker-compose, add network_mode: "host"
Ideally you would setup mongodo in it's own container and connect them from your docker-compose.yml -- but that's not what you are asking for. So, I won't go into that.
In future questions, please include relevant Dockerfile, docker-compose.yml to the extent possible. It will help us give more specific answer.
I'm new to learning how to use goLang to build microservices. I had a whole project up and running locally, but when I tried deploying it I ran into a problem. The session I was working with (mgo.Dial("localhost")) was no longer working. When I put this into a docker image, it failed to connect to the local host, which makes sense, since the docker image builds it over a new OS (alpine in my case). I was wondering what I should do to get it to connect.
To be clear, when I was researching this, most people wanted to connect to a mongoDB session that is a docker container, I want to connect to a mongoDB session from within a docker container. Also once I'm ready for deployment I'll be using StatefulSet with kubernetes if that changes anything.
For example, this is what I want my program to be like:
sess, err := mgo.Dial("localhost") //or whatever
if err != nil {
fmt.Println("failed to connect")
else {
fmt.Println("connected")
What I tried doing:
Dockerfile:
FROM alpine:3.6
COPY /build/app /bin/
EXPOSE 8080
ENTRYPOINT ["/bin/app"]
In terminal:
docker build -t hell:4 .
docker run -d -p 8080:8080 hell:4
And as you can expect, it says not connected. Also the port mapping is for the rest of the project, not this part.
Thanks for your help!
I think you should not try to connect to the MongoDB server running on your machine. Think about deploying the whole application lateron you want a MongoDB server running together with your service on some cloud or server.
That problem could be solved by setting up an additional container and link it to your Go Web App. Docker compose can handle this. Just place a docker-compose.yml file in the directory you are executing your docker build in.
version: '3'
services:
myapp:
build: .
image: hell:4
ports:
- 8080:8080
links:
- mongodb
depends_on:
- mongodb
mongodb:
image: mongo:latest
ports:
- "27017:27017"
environment:
- MONGODB_USER="user"
- MONGODB_PASS="pass"
Something like this should do it (not tested). You have two services: One for your app that gets build according to your Dockerfile in the directory in which you currently are. Additionally it links to a service called mongodb defined below. The mongodb service is accessible via the service name mongodb.
If your mongoDB server is running in your host machine, replace localhost by you host IP.
I'm having docker container up and running by using the following command:
docker run -p 27017:27017 -d mongo
Docker Logs for reference.
Then I clone a github repo: https://github.com/springframeworkguru/spring-boot-mongodb.git
Import the project in IntelliJ IDE, build it and run.
SpringBoot App Error Logs here
Issue : I'm not able to connect to the mongo app running in the container from my SpringBoot application as I'm getting MongoSocketOpenException as shown in the logs.
Any help is appreciated?
Docker version 18.03.0-ce, build 0520e24302
OS: Windows 10
Docker for win has some problems with loopback interfaces.
https://blog.sixeyed.com/published-ports-on-windows-containers-dont-do-loopback/
Try run docker inspect and configure your application with the container address.
Problem: I was trying to configure SpringBoot Application to mongo container IP which I retrieved from mongo inspect <mongo_container> command which was incorrect.
Solution: Configured my application using docker IP retrieved by docker-machine <env> which resolved the problem.
Link to the post is here.
I want to use docker run a vm mongodb, at the same time, the mongo configure file use my own defined configure file to archive replication and open authentication.
Scanning some files but don't resolve the problem.
Any ideas?
The docker mongo image has a docker-entrypoint.sh it calls in the Dockerfile
Check if you can:
create your own image which would create the right user and restart mongo with authentication on: see "umputun/mongo-auth" and its init.sh script
or mount a createUser.js script in docker-entrypoint-initdb.d.
See "how to make a mongo docker container with auth"