how can I communicate between containers?

Im using a container with api gateway in port 80, and I'm needing communicate the api gateway between another containers (all these one using dockerfile and docker-compose). How can I do these others conteiners not expose the port to localhost but communicate internally with the api gateway?

My docker-compose:

version: '3'



services:

  app:

    build:

      context: .

      dockerfile: Dockerfile

    volumes:

      - ./:/usr/src/app

      - /usr/src/app/node_modules

    ports:

      - "3000:3000"

Solution:

Changed docker-compose file to:

version: '3.5'



    services:

      app:

        build:

          context: .

          dockerfile: Dockerfile

        volumes:

          - ./:/usr/src/app

          - /usr/src/app/node_modules

        expose:

          - "3000"

        image: api-name-service

        container_name: api-name-service

        networks: 

          - api-network



networks:

  api-network:

       name: api-network-service

When the services is in the same network, this services can communicate with service name, like "http://api-name-service:3000".

edited Nov 21 '18 at 0:53

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

I'm not quite sure what you're asking--could you try to rephrase the question?

– duhaime
Nov 18 '18 at 1:58

Hi @duhaime. I'm needing just one endpoint to connect with external access (my api gateway - port 80). The others containters, with others ports, I'm trying NOT expose this ports for dont have a external connect, but having access between api gateway and these others containers.

– Titao Yamamoto
Nov 18 '18 at 2:05

Sorry, this is still not clear to me. You have an API on some host, and want other hosts to be able to communicate with the API, but you don't want to "expose" the ports over which they're communicating? Can you define "expose"? Is this all TCP communication?

– duhaime
Nov 18 '18 at 2:14

@duhaime sorry about that, and thank you for help me. Imagine that, I have some containers in my localhost. Just one container receive external access. Anothers can't receive external access, but need to communicate internally with this specific container.

– Titao Yamamoto
Nov 18 '18 at 2:30

1

But you are defining only one service, what other containers do you need to communicate to app? Where are they defined? If you declare another service next to app, they both will be able to discover each other by name.

– gasc
Nov 18 '18 at 3:10

|
show 2 more comments

My docker-compose:

version: '3'



services:

  app:

    build:

      context: .

      dockerfile: Dockerfile

    volumes:

      - ./:/usr/src/app

      - /usr/src/app/node_modules

    ports:

      - "3000:3000"

Solution:

Changed docker-compose file to:

version: '3.5'



    services:

      app:

        build:

          context: .

          dockerfile: Dockerfile

        volumes:

          - ./:/usr/src/app

          - /usr/src/app/node_modules

        expose:

          - "3000"

        image: api-name-service

        container_name: api-name-service

        networks: 

          - api-network



networks:

  api-network:

       name: api-network-service

When the services is in the same network, this services can communicate with service name, like "http://api-name-service:3000".

edited Nov 21 '18 at 0:53

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

I'm not quite sure what you're asking--could you try to rephrase the question?

– duhaime
Nov 18 '18 at 1:58

Hi @duhaime. I'm needing just one endpoint to connect with external access (my api gateway - port 80). The others containters, with others ports, I'm trying NOT expose this ports for dont have a external connect, but having access between api gateway and these others containers.

– Titao Yamamoto
Nov 18 '18 at 2:05

Sorry, this is still not clear to me. You have an API on some host, and want other hosts to be able to communicate with the API, but you don't want to "expose" the ports over which they're communicating? Can you define "expose"? Is this all TCP communication?

– duhaime
Nov 18 '18 at 2:14

@duhaime sorry about that, and thank you for help me. Imagine that, I have some containers in my localhost. Just one container receive external access. Anothers can't receive external access, but need to communicate internally with this specific container.

– Titao Yamamoto
Nov 18 '18 at 2:30

1

But you are defining only one service, what other containers do you need to communicate to app? Where are they defined? If you declare another service next to app, they both will be able to discover each other by name.

– gasc
Nov 18 '18 at 3:10

|
show 2 more comments

My docker-compose:

version: '3'



services:

  app:

    build:

      context: .

      dockerfile: Dockerfile

    volumes:

      - ./:/usr/src/app

      - /usr/src/app/node_modules

    ports:

      - "3000:3000"

Solution:

Changed docker-compose file to:

version: '3.5'



    services:

      app:

        build:

          context: .

          dockerfile: Dockerfile

        volumes:

          - ./:/usr/src/app

          - /usr/src/app/node_modules

        expose:

          - "3000"

        image: api-name-service

        container_name: api-name-service

        networks: 

          - api-network



networks:

  api-network:

       name: api-network-service

When the services is in the same network, this services can communicate with service name, like "http://api-name-service:3000".

edited Nov 21 '18 at 0:53

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

My docker-compose:

version: '3'



services:

  app:

    build:

      context: .

      dockerfile: Dockerfile

    volumes:

      - ./:/usr/src/app

      - /usr/src/app/node_modules

    ports:

      - "3000:3000"

Solution:

Changed docker-compose file to:

version: '3.5'



    services:

      app:

        build:

          context: .

          dockerfile: Dockerfile

        volumes:

          - ./:/usr/src/app

          - /usr/src/app/node_modules

        expose:

          - "3000"

        image: api-name-service

        container_name: api-name-service

        networks: 

          - api-network



networks:

  api-network:

       name: api-network-service

When the services is in the same network, this services can communicate with service name, like "http://api-name-service:3000".

docker docker-compose dockerfile

edited Nov 21 '18 at 0:53

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

edited Nov 21 '18 at 0:53

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

edited Nov 21 '18 at 0:53

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

asked Nov 18 '18 at 1:55

Titao Yamamoto

385

I'm not quite sure what you're asking--could you try to rephrase the question?

– duhaime
Nov 18 '18 at 1:58

Hi @duhaime. I'm needing just one endpoint to connect with external access (my api gateway - port 80). The others containters, with others ports, I'm trying NOT expose this ports for dont have a external connect, but having access between api gateway and these others containers.

– Titao Yamamoto
Nov 18 '18 at 2:05

Sorry, this is still not clear to me. You have an API on some host, and want other hosts to be able to communicate with the API, but you don't want to "expose" the ports over which they're communicating? Can you define "expose"? Is this all TCP communication?

– duhaime
Nov 18 '18 at 2:14

@duhaime sorry about that, and thank you for help me. Imagine that, I have some containers in my localhost. Just one container receive external access. Anothers can't receive external access, but need to communicate internally with this specific container.

– Titao Yamamoto
Nov 18 '18 at 2:30

1

But you are defining only one service, what other containers do you need to communicate to app? Where are they defined? If you declare another service next to app, they both will be able to discover each other by name.

– gasc
Nov 18 '18 at 3:10

|
show 2 more comments

I'm not quite sure what you're asking--could you try to rephrase the question?

– duhaime
Nov 18 '18 at 1:58

Hi @duhaime. I'm needing just one endpoint to connect with external access (my api gateway - port 80). The others containters, with others ports, I'm trying NOT expose this ports for dont have a external connect, but having access between api gateway and these others containers.

– Titao Yamamoto
Nov 18 '18 at 2:05

Sorry, this is still not clear to me. You have an API on some host, and want other hosts to be able to communicate with the API, but you don't want to "expose" the ports over which they're communicating? Can you define "expose"? Is this all TCP communication?

– duhaime
Nov 18 '18 at 2:14

@duhaime sorry about that, and thank you for help me. Imagine that, I have some containers in my localhost. Just one container receive external access. Anothers can't receive external access, but need to communicate internally with this specific container.

– Titao Yamamoto
Nov 18 '18 at 2:30

1

But you are defining only one service, what other containers do you need to communicate to app? Where are they defined? If you declare another service next to app, they both will be able to discover each other by name.

– gasc
Nov 18 '18 at 3:10

I'm not quite sure what you're asking--could you try to rephrase the question?

– duhaime
Nov 18 '18 at 1:58

Hi @duhaime. I'm needing just one endpoint to connect with external access (my api gateway - port 80). The others containters, with others ports, I'm trying NOT expose this ports for dont have a external connect, but having access between api gateway and these others containers.

– Titao Yamamoto
Nov 18 '18 at 2:05

Sorry, this is still not clear to me. You have an API on some host, and want other hosts to be able to communicate with the API, but you don't want to "expose" the ports over which they're communicating? Can you define "expose"? Is this all TCP communication?

– duhaime
Nov 18 '18 at 2:14

@duhaime sorry about that, and thank you for help me. Imagine that, I have some containers in my localhost. Just one container receive external access. Anothers can't receive external access, but need to communicate internally with this specific container.

– Titao Yamamoto
Nov 18 '18 at 2:30

But you are defining only one service, what other containers do you need to communicate to app? Where are they defined? If you declare another service next to app, they both will be able to discover each other by name.

– gasc
Nov 18 '18 at 3:10

|
show 2 more comments

1 Answer
1

active

oldest

votes

You want to use expose instead of ports:

https://docs.docker.com/compose/compose-file/compose-file-v2/#expose

For example:

services:

    app1:

        expose:

            - "3000"

    app2:

        ...

assuming some API on port 3000 in app1, then app2 would be able to access http://app1:3000/api

edited Nov 18 '18 at 3:08

answered Nov 18 '18 at 2:55

Jonah

34716

I do this, and just show the port on docker ps -a (I don't have external access now). But how can my others services call this one?

– Titao Yamamoto
Nov 18 '18 at 3:04

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

You want to use expose instead of ports:

https://docs.docker.com/compose/compose-file/compose-file-v2/#expose

For example:

services:

    app1:

        expose:

            - "3000"

    app2:

        ...

assuming some API on port 3000 in app1, then app2 would be able to access http://app1:3000/api

edited Nov 18 '18 at 3:08

answered Nov 18 '18 at 2:55

Jonah

34716

I do this, and just show the port on docker ps -a (I don't have external access now). But how can my others services call this one?

– Titao Yamamoto
Nov 18 '18 at 3:04

add a comment |

You want to use expose instead of ports:

https://docs.docker.com/compose/compose-file/compose-file-v2/#expose

For example:

services:

    app1:

        expose:

            - "3000"

    app2:

        ...

assuming some API on port 3000 in app1, then app2 would be able to access http://app1:3000/api

edited Nov 18 '18 at 3:08

answered Nov 18 '18 at 2:55

Jonah

34716

I do this, and just show the port on docker ps -a (I don't have external access now). But how can my others services call this one?

– Titao Yamamoto
Nov 18 '18 at 3:04

add a comment |

You want to use expose instead of ports:

https://docs.docker.com/compose/compose-file/compose-file-v2/#expose

For example:

services:

    app1:

        expose:

            - "3000"

    app2:

        ...

assuming some API on port 3000 in app1, then app2 would be able to access http://app1:3000/api

edited Nov 18 '18 at 3:08

answered Nov 18 '18 at 2:55

Jonah

34716

You want to use expose instead of ports:

https://docs.docker.com/compose/compose-file/compose-file-v2/#expose

For example:

services:

    app1:

        expose:

            - "3000"

    app2:

        ...

assuming some API on port 3000 in app1, then app2 would be able to access http://app1:3000/api

edited Nov 18 '18 at 3:08

answered Nov 18 '18 at 2:55

Jonah

34716

edited Nov 18 '18 at 3:08

answered Nov 18 '18 at 2:55

Jonah

34716

answered Nov 18 '18 at 2:55

Jonah

34716

answered Nov 18 '18 at 2:55

Jonah

34716

I do this, and just show the port on docker ps -a (I don't have external access now). But how can my others services call this one?

– Titao Yamamoto
Nov 18 '18 at 3:04

add a comment |

I do this, and just show the port on docker ps -a (I don't have external access now). But how can my others services call this one?

– Titao Yamamoto
Nov 18 '18 at 3:04

I do this, and just show the port on docker ps -a (I don't have external access now). But how can my others services call this one?

– Titao Yamamoto
Nov 18 '18 at 3:04

add a comment |

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