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(/questions/ask) Ask Question     (2016-11-25 09:39:10Z) Asked 8 years, 3 months ago  Modified (?lastactivity) (2024-04-19 23:06:45Z) 11 months ago  (Viewed 730,333 times) Viewed 730k times         This question shows research effort; it is useful and clear  (70:3:31e,16:4d5b400885ff02bc,10:1742105675,16:1aba209bb0ce016a,8:40801772,560b555da65baddf108821325ffc21f73a59a5a4fcd44b13dc19382d9debc54a) 1017  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:b55fafe629db8bad,10:1742105675,16:840430953d55a993,8:40801772,ebd35bddf53345c1559d7e86d125dc2eea0f9693a8bf63319ccec5c2df009ad6)      Save this question.  (/posts/40801772/timeline)    Show activity on this post.    What is the difference between ports and expose options in docker-compose.yml ?  (/questions/tagged/docker) (show questions tagged 'docker') docker  (/questions/tagged/docker-compose) (show questions tagged 'docker-compose') docker-compose      (/q/40801772) (Short permalink to this question) Share  Share a link to this question     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/40801772/edit) () Improve this question  Follow (70:3:31e,16:6bb87eda2b3e393c,10:1742105675,16:7c8fb2f7174b1d08,8:40801772,99b9b96d99e13d6b3bb2d6ddf4311c7e6e8d6a958ee909c3424b21352cfedd13)  Follow this question to receive notifications       (/posts/40801772/revisions) (show all edits to this post) edited (2022-10-21 11:26:46Z) Oct 21, 2022 at 11:26    (/users/8747928/luis-lavaire) (Luis Lavaire's user avatar)    (/users/8747928/luis-lavaire) Luis Lavaire (reputation score) 701 (7 silver badges)  7  7 silver badges (18 bronze badges)  18  18 bronze badges     asked (2016-11-25 09:39:10Z) Nov 25, 2016 at 9:39   (/users/84143/bibek-shrestha) (Bibek Shrestha's user avatar)    (/users/84143/bibek-shrestha) Bibek Shrestha Bibek Shrestha (reputation score 35,054) 35.1k (7 gold badges)  7  7 gold badges (34 silver badges)  34  34 silver badges (35 bronze badges)  35  35 bronze badges        1 (number of 'useful comment' votes received) 1   (https://www.baeldung.com/ops/docker-compose-expose-vs-ports) baeldung.com/ops/docker-compose-expose-vs-ports  – (/users/298511/mike-lowery) (2,868 reputation) Mike Lowery  Commented (2023-05-06 18:23:21Z, License: CC BY-SA 4.0) May 6, 2023 at 18:23        (Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.) Add a comment |  (Expand to show all comments on this post)          5 Answers 5   Sorted by:  (/questions/40801772/what-is-the-difference-between-ports-and-expose-in-docker-compose?answertab=scoredesc#tab-top) Reset to default   (scoredesc) Highest score (default)  (trending) Trending (recent votes count more)  (modifieddesc) Date modified (newest first)  (createdasc) Date created (oldest first)            This answer is useful  (70:3:31e,16:c1d623684e03f38d,10:1742105675,16:f99a8a7457cb4338,8:40801773,110c70d64565f082f2873ee8112b5c6905dff4a853045f88bd97c06b078df3dd) 1016  (This answer is not useful)    (70:3:31e,16:a1f9d64a2c7f25ce,10:1742105675,16:afd34f4b235a9897,8:40801773,b5383f13c75c559109a19dfe3dff6879dc10f506f11158b1977344b25d06b114)      Save this answer.  (Loading when this answer was accepted…)     (/posts/40801773/timeline)    Show activity on this post.    According to the (https://docs.docker.com/compose/compose-file/) docker-compose reference , (https://docs.docker.com/compose/compose-file/compose-file-v3/#ports) Ports is defined as: Expose ports . Either specify both ports (HOST:CONTAINER), or just the container port (a random host port will be chosen).  Ports mentioned in docker-compose.yml will be shared among different services started by the docker-compose. Ports will be exposed to the host machine to a random port or a given port.  My docker-compose.yml looks like: mysql: image: mysql:5.7 ports: - "3306"   If I do docker-compose ps , it will look like: Name Command State Ports ------------------------------------------------------------------------------------- mysql_1 docker-entrypoint.sh mysqld Up 0.0 .0 .0 :32769->3306/tcp   (https://docs.docker.com/compose/compose-file/compose-file-v3/#expose) Expose is defined as: Expose ports without publishing them to the host machine - they’ll only be accessible to linked services. Only the internal port can be specified.  Ports are not exposed to host machines, only exposed to other services. mysql: image: mysql:5.7 expose: - "3306"   If I do docker-compose ps , it will look like: Name Command State Ports --------------------------------------------------------------- mysql_1 docker-entrypoint.sh mysqld Up 3306 /tcp   Edit In recent versions of Dockerfile, EXPOSE (https://docs.docker.com/engine/reference/builder/#expose) typically doesn't have any operational impact anymore, it is just informative. ((https://stackoverflow.com/a/65785558/5075502) see also )   (/a/40801773) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/40801773/edit) () Improve this answer  Follow (70:3:31e,16:a59ecd1fbbccecf4,10:1742105675,16:8291e53e625c039f,8:40801773,00c4dd8707fa6381944908e5d7daca9108b72dd9b83c31be141270f8d0713ad4)  Follow this answer to receive notifications       (/posts/40801773/revisions) (show all edits to this post) edited (2024-02-14 05:15:00Z) Feb 14, 2024 at 5:15    (/users/32453/rogerdpack) (rogerdpack's user avatar)    (/users/32453/rogerdpack) rogerdpack (reputation score 66,961) 67k (40 gold badges)  40  40 gold badges (284 silver badges)  284  284 silver badges (404 bronze badges)  404  404 bronze badges     answered (2016-11-25 09:39:10Z) Nov 25, 2016 at 9:39   (/users/84143/bibek-shrestha) (Bibek Shrestha's user avatar)    (/users/84143/bibek-shrestha) Bibek Shrestha Bibek Shrestha (reputation score 35,054) 35.1k (7 gold badges)  7  7 gold badges (34 silver badges)  34  34 silver badges (35 bronze badges)  35  35 bronze badges        10 (number of 'useful comment' votes received) 72   would it be possible eto explain what advantages there are to specifying expose in a docker-compose ? As far as I can tell, you don't need to specify expose to make ports accessible to linked services. – (/users/2018084/juicy) (12,530 reputation) Juicy  Commented (2018-05-06 11:23:15Z, License: CC BY-SA 4.0) May 6, 2018 at 11:23      (number of 'useful comment' votes received) 6   Shouldn't it tell that exposed ports will only be available to services in the same docker network (linking is being replaced for most parts)?. – (/users/6313007/meow) (2,201 reputation) meow  Commented (2018-08-26 11:28:23Z, License: CC BY-SA 4.0) Aug 26, 2018 at 11:28   (this comment was edited 1 time)        (number of 'useful comment' votes received) 21   @Juicy I guess it's similar to expose in Dockerfiles: "The EXPOSE instruction does not actually publish the port. It functions as a type of documentation..." (https://docs.docker.com/engine/reference/builder/#expose) docs.docker.com/engine/reference/builder/#expose  – (/users/119937/tsauerwein) (6,051 reputation) tsauerwein  Commented (2018-09-06 11:47:54Z, License: CC BY-SA 4.0) Sep 6, 2018 at 11:47      (number of 'useful comment' votes received) 3   Do Ports override any settings at the firewall level? I just noticed that I didn't open up ports for mysql on the firewall, but they were accessible remotely. I had Ports set to "3306:3306" instead of expose. – (/users/503246/techfandan) (3,502 reputation) TechFanDan  Commented (2019-05-28 23:06:26Z, License: CC BY-SA 4.0) May 28, 2019 at 23:06      (number of 'useful comment' votes received) 6   And remember, if you use docker-compose run , the port definition in docker-compose.yml is ignored by default. Either use docker-compose up or provide the parameter --service-ports  – (/users/1488445/juha-untinen) (1,887 reputation) Juha Untinen  Commented (2019-10-27 13:44:57Z, License: CC BY-SA 4.0) Oct 27, 2019 at 13:44        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.)  |  (Expand to show all comments on this post) Show 5 more comments            This answer is useful  (70:3:31e,16:6313e733f1133d7f,10:1742105675,16:878ca080025b23bf,8:54883938,aed100e474c27389a829de9c86095be07d714a16d0ec49299b314ace3f6bbd66) 471  (This answer is not useful)    (70:3:31e,16:966d513593c8a8db,10:1742105675,16:b265261c7d4f51d0,8:54883938,9c04ef6c26bb9cb848751537a5357294022b07bbf4de38e7e93375679be67e8b)      Save this answer.  (Loading when this answer was accepted…)     (/posts/54883938/timeline)    Show activity on this post.    ports : Activates the container to listen for specified port(s) from the world outside of the docker (can be the same host machine or a different machine) AND is also accessible to the world inside Docker. More than one port can be specified (that's why it's ports not port).  (https://i.sstatic.net/Nb6Om.png) (illustration of "ports")   expose : Activates container to listen for a specific port only from the world inside of docker AND is not accessible to the world outside of Docker. More than one port can be specified.  (https://i.sstatic.net/s4k6E.png) (illustration of "expose")     (/a/54883938) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/54883938/edit) () Improve this answer  Follow (70:3:31e,16:d7b326ded5a5ba4a,10:1742105675,16:a1f0bee63ab812f2,8:54883938,8aaff1a18d8e290f27274a5c829ef8ee63bc4c205141544faa974a5d596c86f2)  Follow this answer to receive notifications       (/posts/54883938/revisions) (show all edits to this post) edited (2024-04-19 23:06:45Z) Apr 19, 2024 at 23:06    (/users/775954/matthias-braun) (Matthias Braun's user avatar)    (/users/775954/matthias-braun) Matthias Braun (reputation score 34,433) 34.4k (27 gold badges)  27  27 gold badges (153 silver badges)  153  153 silver badges (176 bronze badges)  176  176 bronze badges     answered (2019-02-26 10:58:25Z) Feb 26, 2019 at 10:58   (/users/4516110/mehraj-malik) (Mehraj Malik's user avatar)    (/users/4516110/mehraj-malik) Mehraj Malik Mehraj Malik (reputation score 15,874) 15.9k (18 gold badges)  18  18 gold badges (61 silver badges)  61  61 silver badges (88 bronze badges)  88  88 bronze badges        6 (number of 'useful comment' votes received) 8   Note that expose allows multiple ports - (https://docs.docker.com/compose/compose-file/#expose) docs.docker.com/compose/compose-file/#expose - however you only supply the internal port rather than internal + external – (/users/1990221/stuart-moore) (801 reputation) Stuart Moore  Commented (2019-04-24 14:02:57Z, License: CC BY-SA 4.0) Apr 24, 2019 at 14:02      (number of 'useful comment' votes received) 1   That's very important part: 'Activates container to listen for a specific port only from the world inside' – (/users/6725736/reven) (776 reputation) Reven  Commented (2020-07-24 10:53:50Z, License: CC BY-SA 4.0) Jul 24, 2020 at 10:53        actually, all these days I understood this concept in reverse order thank you!! – (/users/10053166/aditya) (466 reputation) Aditya  Commented (2023-07-13 19:40:05Z, License: CC BY-SA 4.0) Jul 13, 2023 at 19:40      (number of 'useful comment' votes received) 1   larsks claims this is incorrect (https://stackoverflow.com/a/65785558/3755989) stackoverflow.com/a/65785558/3755989  – (/users/3755989/johan) (226 reputation) Johan  Commented (2024-01-11 08:58:20Z, License: CC BY-SA 4.0) Jan 11, 2024 at 8:58        When you say world inside docker , does it include all containers running on the same host (EC2 instance), even those containers outside the specific docker-compose file? – (/users/2604247/della) (1,636 reputation) Della  Commented (2024-07-08 08:00:25Z, License: CC BY-SA 4.0) Jul 8, 2024 at 8:00        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.)  |  (Expand to show all comments on this post) Show 1 more comment         This answer is useful  (70:3:31e,16:51c241df49163bde,10:1742105675,16:c38d025d65ee9dbc,8:52681569,ba2536ad5cd36a77233786f5852dc080bb7654be59770e90cfab43f6fb75337b) 99  (This answer is not useful)    (70:3:31e,16:c26cf73779c9b92f,10:1742105675,16:4ff697d1795352aa,8:52681569,487bd99eb24dcade89ac28e631b1086c5bd8095149b74eaa2f73ee85632cb732)      Save this answer.  (Loading when this answer was accepted…)     (/posts/52681569/timeline)    Show activity on this post.    Ports This section is used to define the mapping between the host server and Docker container. ports: - 10005 :80   It means the application running inside the container is exposed at port 80. But external system/entity cannot access it, so it need to be mapped to host server port. Note: you have to open the host port 10005 and modify firewall rules to allow external entities to access the application. They can use  http://{host IP}:10005  something like this EXPOSE This is exclusively used to define the port on which application is running inside the docker container. You can define it in dockerfile as well. Generally, it is good and widely used practice to define EXPOSE inside dockerfile because very rarely anyone run them on other port than default 80 port   (/a/52681569) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/52681569/edit) () Improve this answer  Follow (70:3:31e,16:4d1bd1ef0ffa4174,10:1742105675,16:fdb779e3f7d328ff,8:52681569,78d3f5cf419e3ebc99169fef5c6e4b504b32216606d6b5d9acd21f5dc5dd02ec)  Follow this answer to receive notifications       (/posts/52681569/revisions) (show all edits to this post) edited (2018-10-06 18:42:56Z) Oct 6, 2018 at 18:42         answered (2018-10-06 17:24:24Z) Oct 6, 2018 at 17:24   (/users/9941105/sorabzone) (sorabzone's user avatar)    (/users/9941105/sorabzone) sorabzone sorabzone (reputation score) 1,037 (7 silver badges)  7  7 silver badges (8 bronze badges)  8  8 bronze badges        0   (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)             This answer is useful  (70:3:31e,16:439fb5ecc902feec,10:1742105675,16:1737421d21c770ed,8:56826180,233c622ef8e16279f2272e90ab0fd35ec9486191267b97d0478c73507b371d07) 80  (This answer is not useful)    (70:3:31e,16:3284dfdddbfa4963,10:1742105675,16:532441017facaf26,8:56826180,72d18a77fad9f23f2181ac1f8ff4b95afa1b981b67be3e6584ba876099f995d6)      Save this answer.  (Loading when this answer was accepted…)     (/posts/56826180/timeline)    Show activity on this post.    Ports The ports section will publish ports on the host. Docker will set up a forward for a specific port from the host network into the container. By default, this is implemented with a userspace proxy process (docker-proxy ) that listens on the first port, and forwards into the container, which needs to listen on the second point. If the container is not listening on the destination port, you will still see something listening on the host, but get a connection refused if you try to connect to that host port, from the failed forward into your container. Note, the container must be listening on all network interfaces since this proxy is not running within the container's network namespace and cannot reach 127.0.0.1 inside the container. The IPv4 method for that is to configure your application to listen on 0.0.0.0 . Also note that published ports do not work in the opposite direction. You cannot connect to a service on the host from the container by publishing a port. Instead you'll find docker errors trying to listen to the already-in-use host port. Expose Expose is documentation. It sets metadata on the image, and when running, on the container too. Typically, you configure this in the Dockerfile with the EXPOSE instruction, and it serves as documentation for the users running your image, for them to know on which ports by default your application will be listening. When configured with a compose file, this metadata is only set on the container. You can see the exposed ports when you run a docker inspect on the image or container. There are a few tools that rely on exposed ports. In docker, the -P flag will publish all exposed ports onto ephemeral ports on the host. There are also various reverse proxies that will default to using an exposed port when sending traffic to your application if you do not explicitly set the container port. Other than those external tools, expose has no impact at all on the networking between containers. You only need a common docker network, and connecting to the container port, to access one container from another. If that network is user created (e.g. not the default bridge network named bridge ), you can use DNS to connect to the other containers.   (/a/56826180) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/56826180/edit) () Improve this answer  Follow (70:3:31e,16:e4ae3550653ecdf9,10:1742105675,16:346579d81ff8ae85,8:56826180,b742ee866cde99668e5a69fbbc77c6809e6094c6571f52924e867e39cac5567a)  Follow this answer to receive notifications       (/posts/56826180/revisions) (show all edits to this post) edited (2022-10-06 04:48:58Z) Oct 6, 2022 at 4:48    (/users/1402846/pang) (Pang's user avatar)    (/users/1402846/pang) Pang (reputation score 10,127) 10.1k (146 gold badges)  146  146 gold badges (86 silver badges)  86  86 silver badges (124 bronze badges)  124  124 bronze badges     answered (2019-06-30 15:50:28Z) Jun 30, 2019 at 15:50   (/users/596285/bmitch) (BMitch's user avatar)    (/users/596285/bmitch) BMitch BMitch (reputation score 265,278) 265k (50 gold badges)  50  50 gold badges (542 silver badges)  542  542 silver badges (499 bronze badges)  499  499 bronze badges        0   (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)          This answer is useful  (70:3:31e,16:12c1fe6894bcac52,10:1742105675,16:7a4b7b91c216a1ff,8:54665221,3e9863ce0453c39d3d1f4c9c04be16a5fa2beaae06d0b31e5fb83cf940e354a3) 12  (This answer is not useful)    (70:3:31e,16:4e7e2b95938a219a,10:1742105675,16:4417647eb460bed1,8:54665221,2a2883f99bf79aef63eeb6a7d649a18f2c2fad4e32448ea2da813ee9efa77e03)      Save this answer.  (Loading when this answer was accepted…)     (/posts/54665221/timeline)    Show activity on this post.    I totally agree with the answers before. 
I just like to mention that the difference between expose and ports is part of the security concept in docker. It goes hand in hand with the (https://docs.docker.com/network/) networking of docker. 
For example: Imagine an application with a web front-end and a database back-end.
  The outside world needs access to the web front-end (perhaps on port
  80), but only the back-end itself needs access to the database host
  and port. Using a user-defined bridge, only the web port needs to be
  opened, and the database application doesn’t need any ports open,
  since the web front-end can reach it over the user-defined bridge.  This is a common use case when setting up a network architecture in docker. 
So for example in a default bridge network, not ports are accessible from the outer world.
Therefor you can open an ingresspoint with "ports". With using "expose" you define communication within the network. If you want to expose the default ports you don't need to define "expose" in your docker-compose file.   (/a/54665221) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/54665221/edit) () Improve this answer  Follow (70:3:31e,16:c078a63560489344,10:1742105675,16:44193533cbbf4bf1,8:54665221,3f329f93fe4f1beb2056ee49bfb194cfc2f0cf5a3796e5f235a49988682af8ae)  Follow this answer to receive notifications       answered (2019-02-13 08:04:31Z) Feb 13, 2019 at 8:04   (/users/9326543/fishingislife) (FishingIsLife's user avatar)    (/users/9326543/fishingislife) FishingIsLife FishingIsLife (reputation score) 2,372 (4 gold badges)  4  4 gold badges (37 silver badges)  37  37 silver badges (64 bronze badges)  64  64 bronze badges           (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) 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