- Docker run port mapping. Mar 23, 2024 · How to Use Docker Run Expose Port. Fire this website up with. sh If you're running boot2docker on Mac, be sure to forward the same ports on boot2docker to your local machine. create an image of your existing container. json /app/ RUN npm ci COPY . 3. yml) After changing the port to 5433, when I run rspec I get: PG::ConnectionBad: could not connect to server: Connection refused Is the server running on host "db. Without this mapping, the image doesn't execute correctly. The for exposing a port using the docker run command is as follows: Apr 7, 2024 · Hello everyone, while I am quite new to Docker, everything actually works perfectly on my Linux Ubuntu 22. --name myPostgresDb is the name we assign to the container that we are creating. 15-alpine WORKDIR /app COPY package*. docker run -p 3000:3000 admin-web:v1 every time you want to start your applicaton. 注意: 容器有自己的内部网络和 ip 地址(使用 docker inspect 可以获取所有的变量,Docker 还可以有一个可变的网络配置。)-p 标记可以多次使用来绑定多个 Nov 6, 2018 · This question is related to understanding how docker deals with a container's hostnames and ports. 99. while, when i try to specify port by using the following command: docker run -d -p 5000:5000 --restart=always --name app mkd63/leo-electricals There is another, an easier way to list the published ports, using the docker container port command. Well, that works so far - the image 使用 docker port 来查看当前映射的端口配置,也可以查看到绑定的地址 $ docker port nostalgic_morse 5000 127. When you create or run a container using docker create or docker run, it does not expose any of its ports to the outside world. In this section, we will explore the and usage of Docker Compose port mapping. ; To map the TCP port 80 (nginx) in the container to port 8080 on the host localhost interface, you would run: To publish the port when running the container, use the -p flag on docker run to publish and map one or more ports, or the -P flag to publish all exposed ports and map them to high-order ports. Here are some examples: Learn the difference between exposing and publishing a Docker port, and how to do it using Dockerfile or docker run commands. Just to lower chances of another app running on the same port. This is handy for avoiding port collisions. Here are some examples of port mappings: Mar 10, 2017 · You can run processes inside a container and outside on the same port. From a networking point of view, this is the same level of isolation as if the nginx process were running directly on the Docker host and not in a container. Vue. But you'd have to do some extra work. This way, we also keep control of which ports of the container opens up to the outside. js app starts normally at :8080. Port mapping, on the other hand, is the process of mapping the ports of a Docker container to ports on the host machine. First installing the docker-compose. The container runs perfectly on my Linux machine, so I pushed it to my Dockerhub Repo. 1 WORKDIR /inetpub/wwwroot EXPOSE 80 COPY index. Then use "docker run" with your desired port mapping for your "newly created" image. 1:49155. PORT -> 200 OK + Flask is running-> Docker on windows does not forward traffic to the docker container as known from linux/mac. Can I force docker to publish the X port on a specified Y port on the host, without having to run custom docker run -p Y:X commands? Aug 12, 2018 · container 1 apache EXPOSE 9090 container 2 glassf EXPOSE 8080 docker run -p 80:9090 container1 docker run -p 80:8080 container2. Refer to Redis Docker Documentation The goal of this tutorial is to start a nginx container which binds directly to port 80 on the Docker host. Docker Compose is a tool that allows you to define and manage multi-container Docker applications. Or in your case, map a port that is already in use to a container. 0 Docker Container port mapping fails. Publishing in docker-compose It is important to note the distinction between HOST_PORT and CONTAINER_PORT. Feb 19, 2016 · If that command returned something like 192. May 24, 2024 · By using this Docker image, we can run a Docker container on any operating system with the only condition is the system should have installed Docker on it. If you have a container with something running on its port 8000, you can run For instance, if your web application inside a Docker container is running a web server on port 5000, you can map port 80 on your host machine to port 5000 in the container. It allows you to map a Dec 27, 2023 · Step-by-Step Guide to Mapping Host Ports to Containers. docker run --expose 80 nginx. Maps port 80 in container onto 8080 externally on host Sep 16, 2019 · You have 2 sides to port mapping in Docker - the host side and the client/container side. For instance, you can bind port 8080 of the container with an arbitrary port on your computer, like 8081: docker run -d --name rancher-server -p 8081:8080 rancher/server. It has assigned ip address and exposes some ports. Jun 4, 2021 · The applicatio runs fine on local server when i run. docker run --name MyContainer MyImage -p 8080:80 will create container MyContainer from MyImage without issue. docker run -p 5432:5432 postgresql. I can reach this VM through virtual adapter in windows. So it is out of the scope from "docker" command. For a server running on port 3000 in the container: docker run -p 3000:3000 [IMAGE] This command maps port 3000 of the host Mar 23, 2024 · Syntax for Port Mapping. By default, EXPOSE assumes TCP. Nov 23, 2023 · Here, -p is the flag used to specify port mapping. for dev, or prod). This matters when you're running large numbers of containers that use the same port by default, and you don't want to manually assign or track alternative port numbers. Example output:- docker container port nginx 80/tcp -> 127. Fire up your database client like MySQL Workbench or Sequel Pro and connect to Docker host‘s IP on this mapped port: Nov 11, 2013 · You cannot do this via Docker, but you can access the container's un-exposed port from the host machine. 6:00 Docker port forwarding (mapping) not working. If the network mode of a task definition is set to host, host ports must either be undefined or match the container port in the port mapping. Can I map both TCP and UDP May 24, 2023 · Docker port mapping, also known as port forwarding, is a technique used to expose network services running inside a Docker container to the host or other networked devices. We simple expose port 80. Jul 20, 2018 · You don't need to make a docker-compose. 100:8080. Mar 22, 2016 · If I run the container with docker run -P, docker publishes the 8080 port on a random port in the host (which is useless in my specific case). 100:8000:80 -it ubuntu /bin/bash 以上指令会将容器的ip192. Jul 21, 2013 · Let's first start with the Docker run command: docker run --add-host=host. Step3. Port 9981 is open on the VPS on which Netmaker is hosted, but isn't reachable from within the Docker container. 1 custom port. Or you can change the listening port 5432 of Postgres by setting environment variable PGPORT to 7432. To make a port available to services outside of Docker we use the --publish or -p flag. docker container port nginx. Port 465 maps to port 25 in the container. Now MySQL server is running inside the container and exposed on port 23306 outside. Once the image is downloaded docker will run the image as a container called ‘web’. Forwarding Port 3000. NET Core 3. yml version: Dec 27, 2023 · The primary method used to expose Docker container ports is via the docker run command. But the -p 8080:80 part will be silently ignored and your port mapping won't work. Oct 18, 2019 · When I run >docker run -it locationservices I get below message. In this case Apr 4, 2017 · It is really important to know that the HOST:PORT mapping does not work in swarm mode. ] Or add the following to your service, when using Docker Compose: extra_hosts: - "host. The second should be set your --network=host when you docker run or docker container create. html . docker run -d -p 5801:5800 --name vnc1 myvnc docker run -d -p 5802:5800 --name vnc2 Jun 14, 2022 · I am running netmaker which is a wireguard mesh VPN service on a Docker container, and I need port 9981 to be reachable from the Docker container, so that I can access port 9981 via my Wireguard WAN. To do this, Docker Desktop intercepts traffic from the containers and injects it into the host as if it originated from the Docker application. Jan 8, 2019 · This creates a firewall rule which maps a container port to a port on the Docker host. You can use the -p option in docker run to map container ports to host ports, allowing you to run the multiple instances of the container without any conflict. Sometimes you might want to use separate database instances for development and testing purposes. May 29, 2021 · Unfortunately I have not found any documentation from Microsoft that can confirm this but after investigating the issue myself I found that the docker run command that is executed on deploy binds a dynamic port (presumably where external traffic from 443 is routed to) to whichever port is defined in EXPOSE in the Dockerfile of the first image May 30, 2023 · 3:55 Understanding port mapping in Docker run command. If you want to write the port as a code you need to use Docker Compose or Kubernetes. yml beside the Dockerfile and copy Mar 27, 2018 · There are a number of use cases for port mapping, but for DevOps at scale the primary reason is generally to enable mapping well-known service ports to available ports on the host. By specifying the --publish or -p option, we can map a port inside the container to a port on the host machine. e. And when I check the ports with docker ps command the result is: For instance, if you run a container which binds to port 80 and you use host networking, the container's application is available on port 80 on the host's IP address. 168. When you PUBLISH a port, that is, when you include the -p in the docker run or the ports section in the docker-compose. Each instance will run in a separate container. Networked service-to-service communication uses the CONTAINER_PORT. Running these database instances on the same port might conflict. Syntax of Docker Run Expose Port. -p 53160:53160/udp. List port mappings or a specific mapping for the container. Since we told docker to run this container as a daemon let’s connect to a bash shell on the container. s…" Aug 15, 2017 · I am running a docker container that exposes a service on port 465 on the host. The host is the operating system in which the Docker client is running. 0. 22. 2. Port mapping/exposing does not work. Oct 12, 2023 · Note that I’m passing the ‘–net=host’ flag in the docker run command. $ docker container ls shows no exposed ports for containers started by rancher. How can I expose and map ports simultaneously in Docker? Use the command docker container run -d --expose <portNumber> -p <hostPort>:<containerPort> <imageName>. But if you require ACI to listen on different port then define target_port in the environment variables of ACI deployment yaml file as shown below. 7. . Like so: docker run -P your_app Jul 1, 2023 · docker run -p 80:80 webshop -p 80:80 maps port 80 in the host to port 80 inside the docker container. For example, this would work on your host: Mar 12, 2019 · Everything worked when I was using port 5432 (in DATABASE_URL and docker-compose. I have container (which runs mysql service) running as below: CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS 59efytd163d3 myapp:mysql "docker-entrypoint. /spec/spec_helper. In this case, your docker will use the same network interface you use in Mac. 100和80端口,映射到宿主机的8000端口。 示例: #将nginx的80端口映射到宿主机的800端口上 docker run -d -it -p 800:80 nginx 查看映射端口配置 docker port container_ID #容器ID #结果输出 80/tcp -> 0. Here's a breakdown of each part of the command: Here's a Sep 4, 2015 · Your better bet will probably be to simply create new containers for each time a new service is needed. This creates a firewall rule which maps a container port to a port on the Docker host to the outside world. Image name is docker-desktop. I used my docker compose file to build a Node. Mar 22, 2018 · The way you run your container has 2 conflicting parts:-p 9200:9200 says: "publish (bind) port 9200 of the container to port 9200 of the host"--net="host" says: "use the host's networking stack" According to Docker for Mac - Networking docs / Known limitations, use cases, and workarounds, you should only publish a port: Feb 28, 2019 · The -p option is specifically used with the docker command meanwhile the CMD in Dockerfile just runs a command inside the docker container when it runs. Feb 6, 2024 · When running a Docker container we can set a port mapping to allow communication through the host. How to list ports which are exposed within the rancher network? Is this possible using the docker command? Or do I need rancher? Jun 6, 2020 · If no host_ip is specified, it defaults to 0. There's a couple of ways to solve the issue that you can't connect. 04 machine. Jan 6, 2023 · For example, by default, the below docker file will listens to http port 80 as http_port is set to 80. 100, then you can reach your running docker container and it's exposed port like this: 192. Build the Dec 27, 2023 · First, run the MySQL Docker image while mapping port 3306 inside to host port 23306: $ docker run -p 23306:3306 mysql. internal:host-gateway" Full example of such a Docker Compose file should then look like this: Once a container is started, it will send an http request to the manager with its address and port. Jan 18, 2022 · docker run is the command used to create and run a new container based on an already downloaded image. docker-compose. Jun 14, 2017 · When you run a docker container, you can either run a container in foreground, or you can run it in the background. Jun 30, 2023 · Step 5: In this step, we run Jenkins and map the port by changing the docker run command by adding the p option which specifies the port mapping. override. Also, note that I’m not specifying any port mappings. When you execute docker run, the container process that runs is isolated in that it has its own file system, its own networking, and its own isolated process tree separate from the host. Postgres natively exposes the port 5432, and we have to map that port (that lives within Docker) to a local port. ) Hopefully this helps someone (or me, next time I work with docker xD) Running the same type of -p option on Windows 2016 also does not work. 0:800 Jun 6, 2023 · The command docker run -it -p 8000:3007 node-app is used to run a Docker container from the "node-app" image while specifying port mapping. The docker run command provides a simple and intuitive way to expose ports for our containers. Nov 27, 2020 · ポートマッピングとは. yml file that's used for overriding the docker-compose. Is there a way to specify this mapping inside the Dockerfile, so I don't need to include this additional option every time I try to run the image? In particular, I want others to be Jan 13, 2015 · Note that we no longer need port mapping here. 6 python3 -m http. To perform port mapping when running a Docker container, you need to follow a specific . Install Docker Compose; Second create docker-compose. By default, this exposes the container port as port 80, but doesn't expose a fixed host port to map the container port ot. On my machine it is Jul 12, 2020 · Port Mapping. Run the App. json file at /var/lib/docker/containers/[hash_of_the_container]/hostconfig. The “-P” flag causes all exposed ports to be mapped to random host ports. Then you can use the -p to map host port with the container port, as defined in above EXPOSE of Dockerfile. ; If no protocol is specified, it defaults to TCP. So, if you ssh into a server, you entered the host. May 22, 2021 · As far as I understood, it uses iptables on Linux and it allows to forward traffic not only by ip but also by port. . When that container was created, the -P flag was used to automatically map any network port inside it to a random high port within an ephemeral port range on your Docker host. RUN npm run dev docker-compose. json or /var/snap/docker/common/var-lib-docker/containers/[hash_of_the_container]/hostconfig. If, for example, you run an OS container with some functionality, you would probably want run the container in foreground in order to use this functionality. What you can't do is map the one port from the host to a container. 2) and accepting TCP/IP connections on port 5433? # . js image, and I also wrote a Dockerfile for it. Docker Port Mapping. ; To publish multiple ports, use multiple -p options. Read more: Container networking - Published ports. On the Windows 2016 I tried all of the available ip addresses but only the address shown from docker inspect and the original port from the EXPOSE statement worked. Exposing and publishing are not supposed to be competitors. Jan 3, 2020 · There's also a docker-compose. With the container running (F5 debug, command line) - execute the following command: "docker ps -a" You will see a list of running containers; there's a column called "Ports". 5 you can now expose a range of ports to other linked containers using: The Dockerfile EXPOSE command: EXPOSE 7000-8000. yml with environment-specific settings (e. sudo docker run -p 53160:53160 \ -p 53160:53160/udp -p 58846:58846 \ -p 8112:8112 -t -i aostanin/deluge /start. Note Given that the container does not have its own IP-address when using host mode networking, port-mapping doesn't take effect, and the -p , --publish , -P , and --publish-all Mar 19, 2024 · To publish multiple port mappings, we use the -p parameter multiple times: $ docker run --name myapp -d -p 80:8080 -p 81:8081 my-app:latest. docker run --name db_Dev -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=postgresDev -e PGPORT=7432 -p 7432:7432 postgres Jun 12, 2018 · Currently, I run a simple docker container by using the following files. docker. In the above docker run we have mapped port 9090 to run on 90; 5. Examples Show all mapped ports. yml file, but it certainly will make your life easier if you have one, because then you can just run docker-compose up every time to run the container instead of having to run . The syntax is as follows: docker run -p <host-port>:<container-port> <image-name> Let’s break down the syntax: Related: A Step-by-Step Guide On How To Burn ISO To USB. All of your containers would have a vnc service running internally on the VNC port, and then you would allocate new ports each time you started a new server. internal:host-gateway [. docker run -P nginx. What changes needed to be done on my docker-compose file to solve this issue ? new version of dockerfile and docker-compose : Aug 8, 2021 · To map the application or the host port number to the docker container port number, you can use the docker run command followed by the -p flag (port number flag) and then the docker port number followed by a : (colon) and then the application port number and then the name of the docker image to use. The Feb 5, 2017 · You'll have to create a new container with proper port mapping. sudo docker run -p 8080:8080 50000:500000 jenkins. Or instead you can publish a range of ports to the host machine via Docker run command: docker run -p 7000-8000:7000-8000 Apr 10, 2017 · suppose the same service are running in different containers, but the port mapping remains same, the first container starts well , but the same service from second container will fail. When HOST_PORT is defined, the service is accessible outside the swarm as well. The left-hand port number is the docker host port - your computer - and the right-hand side is Jan 19, 2024 · Exposing ports in Docker makes them available for mapping, allowing communication between the container and external services or other Docker containers. See examples of exposing multiple ports, TCP and UDP modes, and checking exposed ports with docker ps. Here are some of the examples of Docker run commands using -p along with tcp/udp - Dec 14, 2018 · Not sure if this question still relevant for you, but I also encountered this issue and left my solution here for others. Nov 16, 2021 · Try to run the application on a different port than 80 in the container, and map it. For example, port 5600. I can't find why it's not mapped by Docker: Dockerfile: FROM node:10. You can use the “docker port” command for viewing the port mapping: docker port <container_name_or_id> When requesting a kubernetes service (via http for example) I am using port 80. Sep 15, 2019 · Here -p 7432:5432 is mapping port 5432 inside your Postgres container on to port 7432 of your host. There are specific ports on host pre-allocated for this purpose (5000-5004). So here I'm, telling you - yep, it's possible. -p 5455:5432 is the port mapping. Better than opening the port is to 'expose' the port and then connect to it via the address redis:3901 (this will only be availabe to other containers in the same network) – Dec 22, 2014 · Use the -p flag and add /udp suffix to the port number. This exposes port 80 on container but does not publish it. Let's say I have two services that are running in a different docker container and exposing port 80 from the container to port 8081 (service1) and port 8082 (service2): service1: 8081:80 service2: 8082:80 Jul 11, 2024 · For example, execute the following command to run a container based on the nginx:latest image, and map container port 80 to host port 8080: docker run -p 8080:80 nginx:latest Use the lsof command to check port 8080 on the host system: Jul 23, 2018 · You can change the port settings when you are running the docker run command. g. 1:8081 When to expose a port and when to publish it? This is a fair question. Now, I tried pulling that image on my Windows 11 machine. The basics of host to container port mapping rely on one key Docker flag: -p When starting a container with docker run, append -p <host_port>:<container_port> to any run command and traffic hitting that interface on the specified host port will redirect into the container on the container port. The containers are created using docker-compose. run the docker postgres - make sure the port is published, I use alpine because it's lightweight. Jun 8, 2016 · I managed to get it run on linux. 6 days ago · For keeping the port mapping, you can use the “-P” flag rather than the “-p” flag in the “docker run” command. docker run --name MyContainer -p 8080:80 MyImage Apr 13, 2018 · Since we started the containers with Rancher, no port is exposed to the host by default. docker run: This command is used to start a new Docker container. DockerFile FROM microsoft/aspnet:4. local" (172. Next, when docker ps was run, you saw that port 5000 in the container was bound to port 49155 on the host. Rancher CLI rancheris not installed. Among those answers, a saint would have mentioned - it's possible. You can find out all the ports mapped by not specifying a PRIVATE_PORT, or just a specific mapping: Jun 1, 2020 · The first port : the Docker host ( you can use this port to access to your container) to access to the container from the outside. ポートマッピング 【 port mapping 】 ポートマッピングとは、ブロードバンドルータなどが持つ機能の一つで、グローバルIPアドレスの特定のポートを、特定のプライベートIPアドレスの特定のポートに固定的に対応付けて転送するもの。 Mar 23, 2024 · Syntax and Usage of Docker Compose Port Mapping. Sep 23, 2015 · For example, if your docker run command had -p 80:8080, it's exposing port 8080 on the container and publishing port 80 on the host. We explore some strategies for changing the port mapping for an existing container. Now, in case of windows we have docker running in WSL2. docker run -p 8080:80 nginx. This usually is fixed for the lifetime of the container. The request is forwarded to a pod (still on port 80) The port forwards the request to the (docker) container that exposes port 80; The container handles the request; However my container exposes a different port, let's say 3000. Now, when someone accesses your host machine’s IP address on port 80, the request is automatically redirected to the web server running inside the container on port 5000. to map a fixed host port of 8080): Apr 6, 2018 · docker run -p 192. ) docker run my_image -p 3000:80 (Wrong format; docker will not notify you, and will silently fail port publishing. But you can use docker-compose to set config and run your docker images easily. Mar 3, 2022 · On docker dashboard label it is running on port 3407 But when I go inside to logs of the payment container than it shows 3306 again. Here's how to simulate such a service: $ docker run --rm -it -p 465:25 python:3. docker run --rm -P -p 127. The service runs on port 80 in the container. ASP. Example : I want to run tomcat server in a docker container, the default port of tomcat is 8080 and I want to expose my docker on port 9000 so i have to write : Docker Desktop networking can work when attached to a VPN. docker asp. This allows developers to run their application code on their operating system without facing any errors related to the operating system or hardware requirements. Oct 9, 2017 · docker build -t foo:tag . Let‘s explore common run parameters for publishing: Expose Port. This creates a firewall rule in the host, mapping a container port to a port on the Docker host to the outside world. server 25 My problem is that I cannot access port 465 on my server from the outside: Mar 9, 2024 · You can modify the port mapping by using the docker container update command and providing the container ID or name and the –publish or -p flag followed by the new port mapping configuration. org Use the --publish or -p flag to make a port available to services outside the bridge network. You can only really expose ports in the Dockerfile, if you want the flexibility to publish the ports, you'll need to use the -P opting with docker run. 0. Port mapping. docker run -d -P <container-name> So, here the app runs on some random port on which i am able to see my app running. json if you installed Docker as a snap. See full list on geeksforgeeks. Apr 20, 2021 · When i check running containers with "docker ps" the port column is empty therefore no port mapping was done even though i specified ports in my docker compose file. yml, you are making an association between some PORT in the Docker container and the PORT on the Docker host. The container is what is running on top of your host, for example if you run a docker run command, the thing that will run as a result of that command is the container. May 8, 2015 · The first is in this post How to access host port from docker container. Using the Docker API For advanced users, the Docker API provides a programmatic way to assign a new port mapping to a running container. The choice of how to run your container really depends on your use case. Use the docker compose up command to start the application. Nov 17, 2016 · Since Docker 1. When you run a container with the -p argument, for example: $ In this case, you’re using the same HOST_PORT:CONTAINER_PORT used in the docker run command. From inside a container you cannot figure out to which docker host port a container port is mapped to. From the above I see that port 80 of your host machine is already mapped to container1, but again you are trying to map it to container 2 and this will not work. 1 TCP UDP port binding. yml: Most fields of this parameter (containerPort, hostPort, protocol) maps to PortBindings in the docker container create command and the --publish option to docker run. the second one : is the port used by your application. You can also specify UDP: Dec 29, 2016 · mkdir -p /etc/redis/ chown -R 1000:1000 /etc/redis sudo docker run -d --name redis -p 6379:6379 --restart unless-stopped -v /etc/redis/:/data redis redis-server /data NOTE: The important part that is key to your solution is to have port expose (-p 6379:6379) to your docker host and route to container port. docker run -p 3001:3000 -p 23:22 In case you would like to expose a range of continuous ports, you can run docker like this: docker run -it -p 7100-7120:7100-7120/tcp Description. In the above example, for db, the HOST_PORT is 8001 and the container port is 5432 (postgres default). 7:05 Fixing Docker container port mapping not exposed issue. You can even run multiple containers using the same port internally. Sep 8, 2020 · I want to run 5 independent instances of the service website on host. The host may be local or remote. Full command. net core 2. This syntax will work - you'll see exactly the same outcome except that port mapping will actually work. so to avoid this, either change the port mappings or create a network. To change it (e. This page details how to use the docker run command to run containers. Similarly, the following command will run a container for postgresql and map port 5432 of this container to port 5432 of the docker host. #Dockerfile FROM TestImage ARG http_port=80 ENV target_port ${http_port} . Oct 12, 2013 · You can change the port mapping by directly editing the hostconfig. Publish Port. I used PowerShell with the next docker command (almost the same as your command, just used internal port 90 instead of 5000 and used --rm switch which will automatically remove the container when it exits): This is the actual port mapping. docker-compose up -d Some fun checks regarding the dns mappings for your container: docker exec -it sample-site bash ping sample-site This ping should work, inside your container. Open a terminal and navigate to the directory you created in the previous step. Sep 16, 2021 · Irrespective of the -P (Upper case) here we need to explicitly mention the port. or The Docker run command: docker run --expose=7000-8000. rb:62:in Dec 10, 2019 · After docker-compose up --build app normally starts, but I can't access it (docker ps shows that no port has been mapped). 1:5432:5432 -e POSTGRES_PASSWORD="1234" --name pg postgres:alpine using another terminal, access the database from the host using the postgres uri I want to change the default exposed port for mysql docker container, but if i try to use this command: docker run --detach --name=test-mysql -p 52000:52000 --env="MYSQL_ROOT_PASSWORD=mypassword" Jun 17, 2018 · It is 2020, and docker treats these commands differently: docker run -p 3000:80 my_image (Correct format; port option has to come before image name. This isn't going to be working. Share Improve this answer Jul 8, 2019 · I just started learning docker and I‘m a bit confused with port mapping in docker. hssne qwgxp yoryiz urwty eclyd upuq hmmarlw upibpsdc oqwnzb houvyq