I am trying to deploy a JEE application in Docker container. The application requires embedded apache derby on port 1527. It works fine when run in regular dev environment. However, when I run inside a Docker container, the connection on port 1527 is refused.
Things to note, I am using 'default' db connection. That means the application is trying to access the database on localhost:1527. Following is the error message:
java.net.ConnectException : Error connecting to server localhost on port 1527 with message Connection refused (Connection refused).
I am wondering what does localhost mean within a Docker container, the host server or the container?
Any suggestions to fix it?
Related
I'm currently working on a small app that has to fetch data from a SQL Server DB and push it on the cloud. It works correctly, but I would like to dockerize it to make its deployment easier.
The database is on a private network and I have to use a VPN connection to access it for development (in red in the diagram below). In production, the app will be on a VM in the database's network.
I'm still confused with Docker networks and the --publish option.
Here is my docker-compose file for now.
version: "3.4"
services:
myapp:
build:
context: .
network: host
restart: always
ports:
- "128.1.X.Y:1433:1433"
container_name: myapp
But when I connect to the VPN from my machine (remote) and run my image with this configuration, I get this error:
driver failed programming external connectivity on endpoint myapp (bbb3cc...):
Error starting userland proxy: listen tcp4 128.1.X.Y:1433: bind: cannot assign requested address
Simply "1433:1433" does not work either. The database cannot be accessed. Not really sure about "network: host" either...
Does anyone know what I could be doing wrong?
And another thing I'm wondering is, will the Docker config be the same when I will deploy my container on the VM?
Thank you!
In our application we are using linux based container which access SQL server installed on VM. Everything works fine in local environment outside the container, But when I ran the app in local container we are getting the below error.
"A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: TCP Provider, error: 35 - An internal exception was caught"
appsetings.json
"ConnectionStrings": {
"DbConnection": "Server=tcp:vmname\\sqlservername,49763;Database=dbname;User ID=username_Users;Password=pwd;MultipleActiveResultSets=true;Integrated Security=False;"
}
Dockerfile
FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
.......
Any inputs will be appreciated
The issue was related to TLS version of the SQL server, enabling TLS 1.2 resolved the issue
Please add ;TrustServerCertificate=true to your connection string.
I'm working on a iMac (Sierra) with phpstorm & Vagrant box laravel/homestead
I try to configure the database in the IDE but each time it failed and it said, an idea?
Connection to cmsineria#localhost failed: SSH: java.net.ConnectException: Connection refused.
SSH: java.net.ConnectException: Connection refused
I had the same issue on my Macbook Air Sierra using MAMP.
By default, MAMP use port 8889 for MySQL. Try to change port 3306 to 8889 in General.
I'm trying to deploy a Jhipster application (Spring Boot + AngularJS) to Bluemix Tomcat. However I always get this error:
Error restarting application: Start app timeout
TIP: The application must be listening on the right port. Instead of hard coding the port, use the $PORT environment variable.
The complete error on Bluemix console is:
App instance exited with guid 1c76324f-57fb-4a00-b203-499519b4367c payload:
{
"cc_partition"=>"default",
"droplet"=>"1c76324f-57fb-4a00-b203-499519b4367c",
"version"=>"0103e173-b6d3-4daa-a291-b5792c16b69b",
"instance"=>"0c09506c30764b6c921cabb9a55d9e45",
"index"=>0,
"reason"=>"CRASHED",
"exit_status"=>255,
"exit_description"=>"failed to accept connections within health check timeout",
"crash_timestamp"=>1479341938
}
Instance (index 0) failed to start accepting connections
I've already tried to change the application-dev.yml config to
server:
port: ${VCAP_APP_PORT}
Or
server:
port: 80
However, I have not had any success. How can I pass the port variable to the Jhipster configuration?
I'm running GAE dev server within a Vagrant guest precise64 box with the following network setup (in my Vagrantfile):
Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
config.vm.network :forwarded_port, guest: 8080, host: 9090
end
Which does its thing:
[default] Forwarding ports...
[default] -- 8080 => 9090 (adapter 1)
I start my App Engine server with:
goapp serve
or
dev_appserver.py myappfolder
This starts app engine dev server as expected:
INFO 2013-11-22 dispatcher.py] Starting module running at: http://localhost:8080
In all cases, I'm able to ssh in to the Vagrant guest and curl localhost:8080 successfully.
Unfortunately, from the host I'm unable to get a response from localhost:9090 when running GAE dev web server. Additionally, I've made sure that I don't have anything interfering with the port 9090 on the host machine. Also, I'm almost positive this isn't related to Vagrant as I spun up a quick node.js web server on 8080 and was able to reach it from the host. What am I missing?!!!
You must run the Google App Engine Go dev web server on 0.0.0.0 when leveraging Vagrant port forwarding. Like so:
goapp serve -host=0.0.0.0
See the answers here for more info on ensuring the guest web server is not bound to 127.0.0.1 which is loopback. Web servers that bind to 127.0.0.1 (like App Engine Go dev web server does) by default should be overridden to use 0.0.0.0.