This is on a Mac running Mohave 10.14.3, and Docker 18.09. localhost), just run the following command: docker run -d -p 127.0.0.1:8000:80 nginx. To bind the Docker container port 80 to the host system port 8000 and IP address 127.0.0.1 (a.k.a. This could be either 127.0.0.1 or a different IP address. If I change 5433 back to 5432 in those two spots (ENV and docker-compose.yml) it works again. You can also tell Docker which IP to bind on. My docker-compose.yml uses the ports: "5433:5432" as per the discussion linked above. $ docker inspect a8f5dee227e8 | grep "IPAddress" The container does indeed seem to be running on port 5433 and IP address 172.22.0.2: $ docker psĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĪ8f5dee227e8 postgres:10.5 "docker-entrypoint.s…" 27 minutes ago Up 14 seconds 0.0.0.0:5433->5432/tcp zarc_db.local_1 If you want to access the particular application with the help of port number you need to map the port number of the container with the port number of the docker host. docker run -i -t -h nginx -name webserver -p 9091:80 ccc6e87d482b /bin/bash. In docker, all the application in the container runs on particular ports when you run a container. Run a new docker container and map the port. spec/spec_helper.rb:62:in `block (2 levels) in ' Here take webserver nginx as an example, port 9091 of the Mac host is mapped to port 80 of the container. Is the server running on host "db.local" (172.22.0.2) and accepting In my test ENV I worked when I was using port 5432 (in DATABASE_URL and docker-compose.yml)Īfter changing the port to 5433, when I run rspec I get: PG::ConnectionBad:Ĭould not connect to server: Connection refused All the docker container ports will be available since the network host mode makes the container use the hosts network stack. (The reason for the port change is because an unrelated project that I leave running is already using port 5432 so I'd like to be able to run rspec simultaneously on multiple projects.) Example 4: dockerfile expose udp port EXPOSE 8285 /udp Example 5: docker run all port mapping docker run -network host When running using -network host there is no need to map the ports. I am trying to get a postgres container running on a different port (5433 instead of the default 5432) per several online threads like this one:
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