postgresql - Docker compose linking appears to not work -


i'm using docker compose run elixir/phoenix app in development. setup pretty standard, postgres container , web container.

however, i'm having hard time getting web container talk database container.

here web container dockerfile:

from ubuntu:14.04 maintainer me@example.com  run locale-gen en_us.utf-8   env lang en_us.utf-8   env language en_us:en   env lc_all en_us.utf-8   env debian_frontend noninteractive run apt-get update run apt-get install -y wget run apt-get install -y curl run apt-get install -y inotify-tools run apt-get install -y postgresql-client run wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb \     && dpkg -i erlang-solutions_1.0_all.deb run curl -sl https://deb.nodesource.com/setup_5.x | sudo -e bash - run apt-get install -y nodejs run apt-get update run apt-get install -y esl-erlang  run apt-get install -y elixir run mix local.rebar run mix local.hex --force  add . src/blog/ workdir src/blog/  run mix deps.get run mix deps.compile

here's docker-compose.yml:

db:   image: postgres web:   build: .   command: mix phoenix.server   volumes:     - .:/src/blog   ports:     - "4000:4000"   links:     - db

when run docker-compose up, things appear work okay. however, when try run (to create database):

$ docker run blogphoenix_web mix ecto.create

i following error:

** (mix) database blog.repo couldn't created, reason given: psql: not translate host name "db" address: name or service not known

then, if inspect hosts file of web container with:

$ docker run blogphoenix_web cat /etc/hosts

... output:

127.0.0.1       localhost ::1     localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.4      a86e4f02ea56

isn't docker compose supposed create hostname entry db container?

here relevant version numbers docker tooling:

$ docker-machine --version #=> docker-machine version 0.6.0, build e27fb87 $ docker-compose --version #=> docker-compose version 1.6.0, build unknown $ docker --version #=> docker version 1.10.0, build 590d510

edit

okay, noticed may else reading this. command, docker run blogphoenix_web cat /etc/hosts enters new container, whereas command docker exec 845f9d69cb1e cat /etc/hosts enters running container. 845f9d69cb1e container id running version of blogphoenix_web image.

$ docker ps  container id        image               command                  created             status              ports                    names 845f9d69cb1e        blogphoenix_web     "mix phoenix.server"     hour ago   2 minutes        0.0.0.0:4000->4000/tcp   blogphoenix_web_1 21a6f48dfc3b        postgres            "/docker-entrypoint.s"   hour ago   2 minutes        5432/tcp                 blogphoenix_db_1

running exec command expected output hosts file, showing appropriate hostname linkage db container:

$ docker exec 845f9d69cb1e cat /etc/hosts  127.0.0.1       localhost ::1     localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.2      db_1 21a6f48dfc3b blogphoenix_db_1 172.17.0.2      blogphoenix_db_1 21a6f48dfc3b 172.17.0.2      db 21a6f48dfc3b blogphoenix_db_1 172.17.0.3      845f9d69cb1e

in other words, when ran docker run blogphoenix_web mix ecto.create command, executing mix ecto.create in new container based on blogphoenix_web image. new container wasn't started docker-compose , did not have appropriate host file linkage db container setup.

you need run using docker-compose:

docker-compose run web mix ecto.create

docker compose creates linked containers, images not linked. means blogphoenix_web not linked blogphoenix_db, when run

docker-compose

the newly created containers "blogphoenix_web_1" , "blogphoenix_db_1" linked together.


Comments

Post a Comment

Popular posts from this blog

java - pagination of xlsx file to XSSFworkbook using apache POI -

right in code, reading xlsx file, xssfworkbook, , writing database. but, when size of xlsx file increases, causes outofmemory error. can not increase server size, or divide xlsx file pieces. tried loading workbook using file (instead of inputstream), didn't either. i looking way read 10k rows @ time (instead of entire file @ once) , iteratively write workbook , database. is there way apache poi? poi contains called "eventmodel" designed purpose. it's mentioned in faq : the ss eventmodel package api reading excel files without loading whole spreadsheet memory. require more knowledge on part of user, reduces memory consumption more tenfold. based on awt event model in combination sax. if need read-only access, best way it. however, may want double check first if issue somewhere else. check out this item : i think poi using memory! can do? 1 comes quite lot, reason isn't might think. so, first thing check - what's source of prob...
Read more

Unlimited choices in BASH case statement -

consider simple bash snippet: case $option in 1) image=${options[0]%.tar} ;; 2) image=${options[1]%.tar} ;; 3) image=${options[2]%.tar} ;; 4) image=${options[3]%.tar} ;; *) echo "invalid option" exit 1 esac in real script numbers goes 30. makes pretty long. can somehow specify cases variable? something this: case $option in $i) image=${options[$(($i-1))]%.tar} any pointer appreciated. you can match against multiple patterns in single clause: case $option in 1|2|3: echo "$option one, 2 or three" ;; esac if still typing you, can use simple pattern matching: case $option in # following matches # - single-digit numbers 0-9 # - two-digit numbers starting either 1 or 2 # - number 30 [0-9]|[12][0-9]|30) image=${options[$(($option-1))]%.tar} ;; *) echo "invalid option" 1>&2 exit 1 esac
Read more

apache - How do I stop my index.php being run twice for every user -

we've got webapp initial html served using apache , php. i noticed index.php being run twice every request. seems caused / effected rewrite rules in our .htaccess - rewritecond %{http_host} ^(www\.|hotels\.)ourdomain\.com$ [nc,or] rewritecond %{server_name} ^(www\.|hotels\.)ourdomain\.com$ [nc] rewriterule (.*) http://ourdomain.com/$1 [r=301] rewriterule ^hotels/([^/]+)/?\??(.*)$ ?d=$1&$2 [qsa] the final rule moving parameter url path query string. i.e. http://ourdomain.com/hotels/vegas?someparam=1 becomes http://ourdomain.com?d=vegas&someparam=1 if go directly query string version index.php run once. if use url redirected, index.php run twice (i'm checking adding error_log('end of index.php') file). so example going http://ourdomain.com/hotels/paris hits file twice http://ourdomain.com?d=paris hits once. i've seen this question , had @ blog mentioned , , can't find empty string url's (i've tried using yslow process). ...
Read more