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Save this post for later Not now           (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (/questions/74903232/what-is-the-difference-between-network-mode-and-networks-using-docker) What is the difference between network_mode and networks using Docker  (/questions/ask) Ask Question     (2022-12-23 19:10:45Z) Asked 2 years, 2 months ago  Modified (?lastactivity) (2022-12-23 19:37:15Z) 2 years, 2 months ago  (Viewed 12,196 times) Viewed 12k times         This question shows research effort; it is useful and clear  (70:3:31e,16:755cc2ea967786eb,10:1742103442,16:dfb87c861602b479,8:74903232,374761bd2e9dd963dc6e06355b12f20fb782440311dd2c52fdb24b49cd82253a) 8  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:7abe5c3d76c495cc,10:1742103442,16:6d835a9b499a16c2,8:74903232,ed4ba4c776758529eac9cdadbc968d8c8e6a4d8836c692012da560e8f77a0b61)      Save this question.  (/posts/74903232/timeline)    Show activity on this post.    I was trying to use the network "bridge" to join services from different "docker-compose.yml" and I was getting the following error: Network-scoped alias is supported only for containers in user defined networks   Searching a bit, I came to this reference link:: (https://github.com/docker/compose/issues/3012) https://github.com/docker/compose/issues/3012  I read and re-read everything several times, but I couldn't understand the real reason for using one or the other. Can someone explain to me what the difference is in practice? Why when you use network_mode and run docker network inspect bridge all containers correctly linked appear? Before: services: local-db: image: mysql networks: default: external: name: bridge   After: local-db: image: mysql network_mode: bridge    (/questions/tagged/docker) (show questions tagged 'docker') docker  (/questions/tagged/docker-compose) (show questions tagged 'docker-compose') docker-compose  (/questions/tagged/containers) (show questions tagged 'containers') containers      (/q/74903232) (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/74903232/edit) () Improve this question  Follow (70:3:31e,16:ca6c1ac28622904f,10:1742103442,16:7d36a043649f00c6,8:74903232,528b960789f4f5461b53cc4ac73d62a78cadfc63bfc49cd08c1993cf90cf0700)  Follow this question to receive notifications       asked (2022-12-23 19:10:45Z) Dec 23, 2022 at 19:10   (/users/8401294/jos%c3%a9-victor) (José Victor's user avatar)    (/users/8401294/jos%c3%a9-victor) José Victor José Victor (reputation score) 345 (1 gold badge)  1  1 gold badge (2 silver badges)  2  2 silver badges (14 bronze badges)  14  14 bronze badges           (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)          1 Answer 1   Sorted by:  (/questions/74903232/what-is-the-difference-between-network-mode-and-networks-using-docker?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:a3522a9ed7e993bc,10:1742103442,16:af4ee9d39f4111ff,8:74903410,6eee66500b06b335cbf6823e7b276d9b43f13ae5dbf0f0741ce4943162691f82) 6  (This answer is not useful)    (70:3:31e,16:f9a0bf69e1a8b03a,10:1742103442,16:6165cee8b30cc480,8:74903410,aed82f076ce50a597b17bb5bebd8dc2891229240590ecc7ae6ab3adbdb590e6f)      Save this answer.  (Loading when this answer was accepted…)     (/posts/74903410/timeline)    Show activity on this post.    The top level networks section creates networks in compose (or specifies external user created networks) that can be used by various services. Each service then defines a networks section to identify one or more user created networks to join. That service gets automatically configured with a network alias for DNS based service discovery. This is the preferred method to setup networking with services, and by default each of these networks is a bridge network. To skip that entire process, you can use a network_mode that changes from the compose managed networking to switch to host , bridge , none , service:$name , or container:$name . Each of these has unique properties. host has no network namespacing at all, similar to starting a process outside of a container. bridge is the legacy bridge network docker always creates, but disables some features like DNS based service discovery. none is no networking at all, only the loopback interface is defined. service:$name and container:$name are special ways of connecting multiple containers into the same network namespace. The same thing is done by pods in kubernetes, and it can be useful for network troubleshooting or when creating sidecars that require access to localhost. This should only be used as a last resort when building microservices since it breaks the ability to independently scale and deploy the containers.    (/a/74903410) (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/74903410/edit) () Improve this answer  Follow (70:3:31e,16:651e9b4b2fc6a5b0,10:1742103442,16:61eb2b60adf07ecb,8:74903410,99fae59bf17d9971a79b0dd6faed1b8528ba65602a4797f0dd7737e2bdbfdb86)  Follow this answer to receive notifications       answered (2022-12-23 19:37:15Z) Dec 23, 2022 at 19:37   (/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        3   And why can't I use "networks" to add the "bridge"?  Just because "bridge" is a Docker standard? – (/users/8401294/jos%c3%a9-victor) (345 reputation) José Victor  Commented (2022-12-23 19:46:00Z, License: CC BY-SA 4.0) Dec 23, 2022 at 19:46        @JoséVictor the default networks from docker have different properties from user created networks. Compose can't apply its normal settings to containers on those networks. – (/users/596285/bmitch) (265,278 reputation) BMitch  Commented (2022-12-23 19:57:39Z, License: CC BY-SA 4.0) Dec 23, 2022 at 19:57        Now I understand, it is a particularity due to the fact that it is standard docker networks.  Thanks a lot for your patience and explanation. @BMitch – (/users/8401294/jos%c3%a9-victor) (345 reputation) José Victor  Commented (2022-12-23 20:23:39Z, License: CC BY-SA 4.0) Dec 23, 2022 at 20:23        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) 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