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        before being able to upvote. Upvoting indicates when questions and answers are useful. (https://stackoverflow.com/help/whats-reputation) What's reputation and how do I get it?  To start gaining reputation, try answering a related question. node.js nginx docker      Find related question Not now           (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (https://stackoverflow.com/questions/27810076/how-do-i-access-a-server-on-localhost-with-nginx-docker-container) How do I access a server on localhost with nginx docker container?  (https://stackoverflow.com/questions/ask) Ask Question     (2015-01-07 01:27:11Z) Asked 10 years, 3 months ago  Modified (https://stackoverflow.com/questions/27810076/how-do-i-access-a-server-on-localhost-with-nginx-docker-container?lastactivity) (2024-06-20 06:08:00Z) 10 months ago  (Viewed 98,078 times) Viewed 98k times       This question shows research effort; it is useful and clear 75  (This question does not show any research effort; it is unclear or not useful)         Save this question. (https://stackoverflow.com/posts/27810076/timeline)    Show activity on this post.   I'm trying to use a dockerized version of nginx as a proxy server for my node (ExpressJS) application. Without any configuration to nginx and publishing port 80 for the container, I am able to see the default nginx landing page. So I know that much is working. Now I can mount my sites-enabled directory that contains the configuration for proxy_pass localhost:3000 . I have my node application running locally (not in any Docker container) and I can access it via port 3000 (i.e. localhost:3000 ). However, I would assume that with nginx container running, mapped to port 80, and proxying my localhost:3000, that I would be able to see my very simple (hello world) application. Instead I receive a 502.  Do I need to pass something into docker? Is this likely a nginx configuration error? Here is my nginx configuration: server {
  listen 0.0 .0 .0 :80 ;
  server_name localhost;

  location / {
    proxy_pass http ://localhost:3000; }
}   I have tried using (https://stackoverflow.com/questions/24319662/from-inside-of-a-docker-container-how-do-i-connect-to-the-localhost-of-the-mach?rq=1) this question but it did not seem to help. That is unless I'm doing something completely wrong.  (https://stackoverflow.com/questions/tagged/node.js) (show questions tagged 'node.js') node.js  (https://stackoverflow.com/questions/tagged/nginx) (show questions tagged 'nginx') nginx  (https://stackoverflow.com/questions/tagged/docker) (show questions tagged 'docker') docker      (https://stackoverflow.com/q/27810076) (Short permalink to this question) Share   (https://stackoverflow.com/posts/27810076/edit) Improve this question  Follow  Follow this question to receive notifications      asked (2015-01-07 01:27:11Z) Jan 7, 2015 at 1:27   (https://stackoverflow.com/users/3236303/adam-beck) (adam-beck's user avatar)    (https://stackoverflow.com/users/3236303/adam-beck) adam-beck adam-beck (reputation score) 6,019 (5 gold badges)  5  5 gold badges (22 silver badges)  22  22 silver badges (35 bronze badges)  35  35 bronze badges        4   possible duplicate of (http://stackoverflow.com/questions/27556301/connect-to-local-mysql-server-through-docker) Connect to Local MySQL Server Through Docker?  – (https://stackoverflow.com/users/448734/bryan) (12,240 reputation) Bryan  Commented (2015-01-07 11:47:28Z, License: CC BY-SA 3.0) Jan 7, 2015 at 11:47        I tried that as well and couldn't seem to get it to work. I know this similar question has been asked many times and even the 502 error I'm getting has been too, but none of those have worked. I will re-check when I am home from work. – (https://stackoverflow.com/users/3236303/adam-beck) (6,019 reputation) adam-beck  Commented (2015-01-07 13:37:16Z, License: CC BY-SA 3.0) Jan 7, 2015 at 13:37        DNS ftw, imo.  The host has a name ;) – (https://stackoverflow.com/users/2105103/user2105103) (13,165 reputation) user2105103  Commented (2015-01-07 19:27:28Z, License: CC BY-SA 3.0) Jan 7, 2015 at 19:27        docker on linux, version >= 20.04 can use host.docker.internal with a run flag; see (https://stackoverflow.com/a/61424570/2014893) stackoverflow.com/a/61424570/2014893  – (https://stackoverflow.com/users/2014893/robert-k-bell) (10,294 reputation) Robert K. Bell  Commented (2020-08-17 06:28:58Z, License: CC BY-SA 4.0) Aug 17, 2020 at 6:28        (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)        7 Answers 7   Sorted by:  (https://stackoverflow.com/questions/27810076/how-do-i-access-a-server-on-localhost-with-nginx-docker-container?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 86  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)  (https://stackoverflow.com/posts/51086203/timeline)    Show activity on this post.   If you're using docker-for-mac 18.03 or newer it auto creates a special DNS entry host.docker.internal that dynamically binds to the host inet ip. You can then use the dns name to proxy services running on the host machine from inside a container as a stand-in for localhost . i.e. an nginx config file: server {
  listen 0.0 .0 .0 :80 ;
  server_name localhost;

  location / {
    proxy_pass http ://host.docker.internal:3000; }
}     (https://stackoverflow.com/a/51086203) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/51086203/edit) Improve this answer  Follow  Follow this answer to receive notifications      answered (2018-06-28 15:06:12Z) Jun 28, 2018 at 15:06   (https://stackoverflow.com/users/129190/digitaldreamer) (digitaldreamer's user avatar)    (https://stackoverflow.com/users/129190/digitaldreamer) digitaldreamer digitaldreamer (reputation score 55,712) 55.7k (6 gold badges)  6  6 gold badges (35 silver badges)  35  35 silver badges (28 bronze badges)  28  28 bronze badges        3 (number of 'useful comment' votes received) 14   Note: host.docker.internal does not work on linux. – (https://stackoverflow.com/users/6790541/21rw) (1,136 reputation) 21rw  Commented (2021-04-11 03:22:13Z, License: CC BY-SA 4.0) Apr 11, 2021 at 3:22      (number of 'useful comment' votes received) 6   Unless you set extra-hosts (https://stackoverflow.com/a/43541732/6790541) stackoverflow.com/a/43541732/6790541  – (https://stackoverflow.com/users/6790541/21rw) (1,136 reputation) 21rw  Commented (2021-04-11 05:10:32Z, License: CC BY-SA 4.0) Apr 11, 2021 at 5:10      (number of 'useful comment' votes received) 3   This also worked for me on a Windows 10 host. – (https://stackoverflow.com/users/705296/joe-sadoski) (675 reputation) Joe Sadoski  Commented (2021-09-17 15:28:45Z, License: CC BY-SA 4.0) Sep 17, 2021 at 15:28        (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 27  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)     (https://stackoverflow.com/posts/27814576/timeline)    Show activity on this post.   You can get your current IP address as shown (https://stackoverflow.com/questions/845694/how-do-i-find-my-computers-ip-address-using-the-bash-shell) here : ifconfig en0 | grep inet | grep -v inet6 | awk '{print $2}'   Then you can use the --add-host flag with docker run : docker run --add-host localnode :$(ifconfig en0 | grep inet | grep -v inet6 | awk '{print \$2}' ) ...   In your proxypass use localnode instead of localhost .   (https://stackoverflow.com/a/27814576) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/27814576/edit) Improve this answer  Follow  Follow this answer to receive notifications      (https://stackoverflow.com/posts/27814576/revisions) (show all edits to this post) edited (2017-05-23 12:00:29Z) May 23, 2017 at 12:00    (https://stackoverflow.com/users/-1/community) (Community's user avatar)    (https://stackoverflow.com/users/-1/community) Community (Community Bot — not a real person. Replies to this bot are not monitored.) Bot (reputation score) 1 (1 silver badge)  1  1 silver badge     answered (2015-01-07 07:40:06Z) Jan 7, 2015 at 7:40   (https://stackoverflow.com/users/47110/abdullah-jibaly) (Abdullah Jibaly's user avatar)    (https://stackoverflow.com/users/47110/abdullah-jibaly) Abdullah Jibaly Abdullah Jibaly (reputation score 54,880) 54.9k (45 gold badges)  45  45 gold badges (128 silver badges)  128  128 silver badges (201 bronze badges)  201  201 bronze badges        3 (number of 'useful comment' votes received) 1   This was along the right lines but did not work exactly for me. For one I am working off my laptop so my method of extracting the ip was obviously different. I tried using the same method changing en0 but kept getting results with addr:192.xxx.x.xx so I eventually just hard-coded that in. What utility would I use to strip the beginning addr: as providing that will not work with docker. Thank you though. I'm writing this comment for others who come across this problem. – (https://stackoverflow.com/users/3236303/adam-beck) (6,019 reputation) adam-beck  Commented (2015-01-08 02:34:16Z, License: CC BY-SA 3.0) Jan 8, 2015 at 2:34      (number of 'useful comment' votes received) 1   Nevermind, I used sed in order to strip the beginning addr: . As you can tell I'm not a sysops guy :) – (https://stackoverflow.com/users/3236303/adam-beck) (6,019 reputation) adam-beck  Commented (2015-01-08 13:35:20Z, License: CC BY-SA 3.0) Jan 8, 2015 at 13:35        On my Ubuntu, it's eth0 instead of en0. – (https://stackoverflow.com/users/1323283/tedyyu) (607 reputation) tedyyu  Commented (2023-12-10 10:49:59Z, License: CC BY-SA 4.0) Dec 10, 2023 at 10:49        (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 5  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)  (https://stackoverflow.com/posts/27812811/timeline)    Show activity on this post.   Yes. Docker needs to know about your host machine. You can set an alias to that with the --add-host switch. On a *nix box to create an alias to a name "localbox", this would be: docker run my_repo/my_image --add-host=localbox :<host_name>`    On boot2docker it would be: docker run my_repo/my_image --add-host=localbox :192.168 .59 .3 `    where you should replace "192.168.59.3" with whatever boot2docker ip returns. Then, you should access your host machine always through the alias localbox, so just change your nginx config to: location / {
  proxy_pass http ://localbox:3000; }     (https://stackoverflow.com/a/27812811) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/27812811/edit) Improve this answer  Follow  Follow this answer to receive notifications      answered (2015-01-07 05:14:07Z) Jan 7, 2015 at 5:14   (https://stackoverflow.com/users/392975/eli) (Eli's user avatar)    (https://stackoverflow.com/users/392975/eli) Eli Eli (reputation score 39,079) 39.1k (40 gold badges)  40  40 gold badges (155 silver badges)  155  155 silver badges (213 bronze badges)  213  213 bronze badges          (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 3  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)  (https://stackoverflow.com/posts/63895301/timeline)    Show activity on this post.   On linux, this works for me: In the docker-compose.yml, mount an entrypoint script into the nginx container: nginx: image: nginx:1.19.2 # ... volumes: - ./nginx-entrypoint.sh:/docker-entrypoint.d/nginx-entrypoint.sh:ro   The contents of the entrypoint map a local address to the host local address. apt update
apt install iproute2 -y echo "`ip route | awk '/default/ { print $3 }'`\tdocker.host.internal" >> /etc/hosts   Then, instead of using localhost inside the container, you can use docker.host.internal .   (https://stackoverflow.com/a/63895301) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/63895301/edit) Improve this answer  Follow  Follow this answer to receive notifications      answered (2020-09-15 04:50:54Z) Sep 15, 2020 at 4:50   (https://stackoverflow.com/users/802138/matthias) (Matthias's user avatar)    (https://stackoverflow.com/users/802138/matthias) Matthias Matthias (reputation score 15,572) 15.6k (9 gold badges)  9  9 gold badges (49 silver badges)  49  49 silver badges (65 bronze badges)  65  65 bronze badges          (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 0  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)  (https://stackoverflow.com/posts/78645746/timeline)    Show activity on this post.   You can get access a server on localhost by docker desktop host networking. Host networking is also supported on Docker Desktop version 4.29 and later for Mac, Windows, and Linux as a beta feature . To enable this feature, navigate to the Features in development tab in Settings , and then select Enable host networking .  The reference is (https://docs.docker.com/network/drivers/host/#docker-desktop) here    (https://stackoverflow.com/a/78645746) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/78645746/edit) Improve this answer  Follow  Follow this answer to receive notifications      answered (2024-06-20 06:08:00Z) Jun 20, 2024 at 6:08   (https://stackoverflow.com/users/8774520/iku) (iku's user avatar)    (https://stackoverflow.com/users/8774520/iku) iku iku (reputation score) 1,144 (13 silver badges)  13  13 silver badges (16 bronze badges)  16  16 bronze badges          (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 -2  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)  (https://stackoverflow.com/posts/74094859/timeline)    Show activity on this post.   I had the same problem. Fixed it by using the local ip address of the docker host, instead of localhost. So if the local ip address of your docker host in your LAN is 192.168.2.2: location / {
    proxy_pass http ://192.168.2.2:3000; }   Of course this solution only works well if you have assigned a static ip to your docker host.   (https://stackoverflow.com/a/74094859) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/74094859/edit) Improve this answer  Follow  Follow this answer to receive notifications      answered (2022-10-17 09:02:56Z) Oct 17, 2022 at 9:02   (https://stackoverflow.com/users/5630207/jakub) (Jakub's user avatar)    (https://stackoverflow.com/users/5630207/jakub) Jakub Jakub (reputation score) 123 (1 silver badge)  1  1 silver badge (11 bronze badges)  11  11 bronze badges          (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 -3  (This answer is not useful)         Save this answer. (Loading when this answer was accepted…)  (https://stackoverflow.com/posts/51806819/timeline)    Show activity on this post.   And finally, if you are using Nginx as a reverse proxy for multiple services, you can spin all of that with docker-compose. Make sure to expose ports “80:80” only on the Nginx service. Other services you can expose only the service port without mapping to the underlying network like so: web :
..... expose :
       - 8080 nginx :
..... port :
        - “80 :80 ”   and then use Nginx configuration proxy_pass (http://service-name:port) http://service-name:port You don’t need the upstream app part at all   (https://stackoverflow.com/a/51806819) (Short permalink to this answer) Share   (https://stackoverflow.com/posts/51806819/edit) Improve this answer  Follow  Follow this answer to receive notifications      (https://stackoverflow.com/posts/51806819/revisions) (show all edits to this post) edited (2019-01-10 09:58:26Z) Jan 10, 2019 at 9:58    (https://stackoverflow.com/users/1233251/e-net4) (E_net4's user avatar)    (https://stackoverflow.com/users/1233251/e-net4) E_net4 (reputation score 30,161) 30.2k (13 gold badges)  13  13 gold badges (114 silver badges)  114  114 silver badges (151 bronze badges)  151  151 bronze badges     answered (2018-08-12 07:47:47Z) Aug 12, 2018 at 7:47   (https://stackoverflow.com/users/9706751/george-mogilevsky) (George Mogilevsky's user avatar)    (https://stackoverflow.com/users/9706751/george-mogilevsky) George Mogilevsky George Mogilevsky (reputation score) 637 (5 silver badges)  5  5 silver badges (8 bronze badges)  8  8 bronze badges        3   It's not clear what you mean here by "upstream app part" that we won't need.  Also this ends up being not very portable if http://service-name is your external domain instead of localhost.  That was the first alternative I found to localhost, but I don't like it because I can't be sure that my nginx redirects aren't in fact going back out to the internet just to come in on a different port. – (https://stackoverflow.com/users/1279516/jcairney) (3,254 reputation) jcairney  Commented (2019-10-08 00:08:25Z, License: CC BY-SA 4.0) Oct 8, 2019 at 0:08   (this comment was edited 2 times)          Please read the docs, it’s a technical term that you should be familiar with. (http://nginx.org/en/docs/http/ngx_http_upstream_module.html) nginx.org/en/docs/http/ngx_http_upstream_module.html  – (https://stackoverflow.com/users/9706751/george-mogilevsky) (637 reputation) George Mogilevsky  Commented (2019-10-08 00:14:31Z, License: CC BY-SA 4.0) Oct 8, 2019 at 0:14        It is a technical term I was familiar with, but I wouldn't expect everyone to be, nor was I even sure that's what you were referring to.  Also, I do not know why you mentioned it, since nobody else mentioned 'upstream' above.  I would not consider the 'upstream' module a beginner feature, so it's not very sporting to say "you should know this".  This is stackoverflow, where people come because they can't know everything. – (https://stackoverflow.com/users/1279516/jcairney) (3,254 reputation) jcairney  Commented (2019-10-31 19:04:27Z, License: CC BY-SA 4.0) Oct 31, 2019 at 19:04   (this comment was edited 2 times)          (Use comments to ask for more information or suggest improvements. 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