PG ConnectionBad - could not connect to server Connection refused

Question

Every time I run my rails 4 0 server  I get this output    Started GET     for 127 0 0 1 at 2013-11-06 23 56 36 -0500  PG  ConnectionBad - could not connect to server  Connection refused Is the server running on host  localhost     1  and accepting TCP IP connections on port 5432  could not connect to server  Connection refused Is the server running on host  localhost   127 0 0 1  and accepting TCP IP connections on port 5432  could not connect to server  Connection refused Is the server running on host  localhost   fe80  1  and accepting TCP IP connections on port 5432     activerecord  4 0 0  lib active record connection adapters postgresql adapter rb 825 in  connect   activerecord  4 0 0  lib active record connection adapters postgresql adapter rb 542 in  initialize   activerecord  4 0 0  lib active record connection adapters postgresql adapter rb 41 in  postgresql connection   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 440 in  new connection   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 450 in  checkout new connection   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 421 in  acquire connection   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 356 in  block in checkout    System Library Frameworks Ruby framework Versions 2 0 usr lib ruby 2 0 0 monitor rb 211 in  mon synchronize   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 355 in  checkout   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 265 in  block in connection    System Library Frameworks Ruby framework Versions 2 0 usr lib ruby 2 0 0 monitor rb 211 in  mon synchronize   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 264 in  connection   activerecord  4 0 0  lib active record connection adapters abstract connection pool rb 546 in  retrieve connection   activerecord  4 0 0  lib active record connection handling rb 79 in  retrieve connection   activerecord  4 0 0  lib active record connection handling rb 53 in  connection   activerecord  4 0 0  lib active record migration rb 792 in  current version   activerecord  4 0 0  lib active record migration rb 800 in  needs migration    activerecord  4 0 0  lib active record migration rb 379 in  check pending    activerecord  4 0 0  lib active record migration rb 366 in  call   actionpack  4 0 0  lib action dispatch middleware callbacks rb 29 in  block in call   activesupport  4 0 0  lib active support callbacks rb 373 in   run  1613334440513032208  call  callbacks   activesupport  4 0 0  lib active support callbacks rb 80 in  run callbacks   actionpack  4 0 0  lib action dispatch middleware callbacks rb 27 in  call   actionpack  4 0 0  lib action dispatch middleware reloader rb 64 in  call   actionpack  4 0 0  lib action dispatch middleware remote ip rb 76 in  call   better errors  0 9 0  lib better errors middleware rb 84 in  protected app call   better errors  0 9 0  lib better errors middleware rb 79 in  better errors call   better errors  0 9 0  lib better errors middleware rb 56 in  call   actionpack  4 0 0  lib action dispatch middleware debug exceptions rb 17 in  call   actionpack  4 0 0  lib action dispatch middleware show exceptions rb 30 in  call   railties  4 0 0  lib rails rack logger rb 38 in  call app   railties  4 0 0  lib rails rack logger rb 21 in  block in call   activesupport  4 0 0  lib active support tagged logging rb 67 in  block in tagged   activesupport  4 0 0  lib active support tagged logging rb 25 in  tagged   activesupport  4 0 0  lib active support tagged logging rb 67 in  tagged   railties  4 0 0  lib rails rack logger rb 21 in  call   quiet assets  1 0 2  lib quiet assets rb 18 in  call with quiet assets   actionpack  4 0 0  lib action dispatch middleware request id rb 21 in  call   rack  1 5 2  lib rack methodoverride rb 21 in  call   rack  1 5 2  lib rack runtime rb 17 in  call   activesupport  4 0 0  lib active support cache strategy local cache rb 83 in  call   rack  1 5 2  lib rack lock rb 17 in  call   actionpack  4 0 0  lib action dispatch middleware static rb 64 in  call   railties  4 0 0  lib rails engine rb 511 in  call   railties  4 0 0  lib rails application rb 97 in  call   rack  1 5 2  lib rack content length rb 14 in  call   thin  1 5 1  lib thin connection rb 81 in  block in pre process   thin  1 5 1  lib thin connection rb 79 in  pre process   thin  1 5 1  lib thin connection rb 54 in  process   thin  1 5 1  lib thin connection rb 39 in  receive data   eventmachine  1 0 3  lib eventmachine rb 187 in  run   thin  1 5 1  lib thin backends base rb 63 in  start   thin  1 5 1  lib thin server rb 159 in  start   rack  1 5 2  lib rack handler thin rb 16 in  run   rack  1 5 2  lib rack server rb 264 in  start   railties  4 0 0  lib rails commands server rb 84 in  start   railties  4 0 0  lib rails commands rb 78 in  block in  lt top  required  gt    railties  4 0 0  lib rails commands rb 73 in   lt top  required  gt    bin rails 4 in   lt main gt     I m running Mavericks OS X 10 9 so I don t know if that s the problem  I ve tried everything I could but nothing seems to work  I ve uninstalled and install both postgres and the pg gem multiple times now    This is my database yml file  development    adapter  postgresql   encoding  unicode   database  metals-directory development   pool  5   username     password     template  template0   host  localhost   port  5432  test   amp test   adapter  postgresql   encoding  unicode   database  metals-directory test   pool  5   username     password     template  template0   host  localhost   port  5432  staging    adapter  postgresql   encoding  unicode   database  metals-directory production   pool  5   username    password    template  template0   host  localhost  production    adapter  postgresql   encoding  unicode   database  metals-directory production   pool  5   username    password    template  template0   host  localhost  cucumber     lt  lt    test

User · Answer

If removing postmaster pid does not resolve the issue  this worked for me  cd  usr local var  rm -rf postgres  mkdir postgres initdb --locale C -E UTF-8 postgres  brew services restart postgresql  Credit to  spirito libero  s solution on this thread

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Uninstall pg   gem uninstall pg Uninstall postgres   brew uninstall postgres Nuke the postgres folder which might be lingering with a bunch of stale stuff it in   rm -rf  usr local var postgres Reboot  maybe unnecessary  Reinstall pg   brew install postgres My comment in Chris Slade s answer starts pg the hard way  now I use brew services which has simplified my life in so many ways   brew install services And start pg with it   brew services start postgresql Reinstall the gem   gem install pg   And bobsyouruncle

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I got the same problem after updating my mac on Osx Movaje   i found this solution    Try first the bellow command line in your terminal     brew services restart postgresql     If nothing change    ps aux   grep postgres     If still nothing change     ls -ls   grep post     Last command to fix it  removed the postgres lock file by executing from root     rm  usr local var postgres postmaster pid     and then      brew services restart postgresql     From berziiii   https   github com ga-wdi-boston capstone-project issues 325  Hope that will help     Regards

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This is what really helped me     cd  usr local var postgres    rm postmaster pid   Reference  http   alumni lewagon org questions 60

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Mac users with the Postgres app may want to open the application  spotlight search Postgres or find the elephant icon in your menu bar   Therein you may see a red X with the message   Stale postmaster pid file   Unfortunately a spotlight search won t show the location of this file  Click  Server Settings      and in the dialog box that opens  click the  Show  button to open the Data Directory  Navigate one folder in  for me it was  var-10    and delete the postmaster pid file   Go back to the Postgres app and click the Start button  That red X should turn into a green check mark with the message  Running   Now you should be able to successfully run Rails commands like rails server in the terminal

User · Answer

I know this is late but might help somebody  I was having the same issue  Turns out that I d two versions of postgres 9 1 and 9 5  I uninstalled 9 1 and 9 5 and installed 9 5 again and it worked for me

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I have tried all of the answers above and it didn t work for me  In my case when I chekced the log on  usr local var log postgres log  It was fine no error  But I could see that it was listening my local IPV6 address which is  quot   1 quot  In my database yml I was did it like this host       lt    ENV  POSTGRESQL ADDON HOST       127 0 0 1    gt   I changed it by host       lt    ENV  POSTGRESQL ADDON HOST       localhost    gt   and then it worked

User · Answer

Locate your postgres file it could be in  usr local var postgres  or in   usr var postgres  and then delete the postmaster pid file present in that folder

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As suggested above  I just opened up the Postgres App on my Mac  clicked Open Psql  closed the psql window  restarted my rails server in my terminal  and it was working again  no more error    Trust the elephant  http   postgresapp com

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I had the same problem  this explanation solved it for me  http   blog 55minutes com 2013 09 postgresql-93-brew-upgrade   key step was looking at the tail of my  usr local var postgres server log    that let me see what the real problem was  which was that i hadn t fully completed the process of upgrading PostgreSQL

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For me  it was really simple  I had a stale postmaster pid file  Simply deleting and restarting postgres fixed it for me  rm   Users  lt username gt  Library Application Support Postgres var-10 postmaster pid

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I stopped the rails server  ran rake db migrate and started my rails s

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Do you have postgresql installed within your system  If not  then watch Install postgresql  After you successfully integrate postgresql into your system you can type something like that in your system terminal   which psql    gt   usr bin psql   After that you need to create a user and database in postgresql like this   sudo su - postgres psql   Then you can see the following within your terminal  postgres     Type there   CREATE USER yourname WITH PASSWORD  passwordhere   CREATE DATABASE metals-directory production  WITH OWNER yourname  GRANT ALL PRIVILEGES ON DATABASE metals-directory production TO yourname    After you do this  then you need to correct your database yml  Probably you need something like that   development    adapter  postgresql   encoding  unicode   database  metals-directory development   pool  5   username  yourname   password  passwordhere       password you have specified within psql   host  localhost   port  5432                   you can configure it in file postgresql conf   Also if you have problems with postgresql it is good idea to check pg hba conf

User · Answer

I just had this problem and none of the suggested solutions worked for me  After a lot of googling  I did find a solution  This is what worked for me   First  I had to run this command to start the server and I am guessing set the location of config file   pg ctl -D  usr local var postgres start  amp  amp  brew services start postgresql   Then I ran this command to access postgres  psql postgres   And at the postgres prompt then I typed   du  to list the roles  postgres    du   The postgres role was missing so I had to create it with this command  CREATE ROLE POSTGRES WITH SUPERUSER CREATEDB CREATEUSER CREATEROLE REPLICATION BYPASSRLS     That solved my problem and I hope this helps someone else

User · Answer

It could be as simple as a stale PID file  It could be failing silently because your computer didn t complete the shutdown process completely which means postgres didn t delete the PID  process id  file    The PID file is used by postgres to make sure only one instance of the server is running at a time  So when it goes to start again  it fails because there is already a PID file which tells postgres that another instance of the server was started  even though it isn t running  it just didn t get to shutdown and delete the PID     To fix it remove rename the PID file  Find the postgres data directory  On macOS using homebrew it is in  usr local var postgres    or  usr local var log  other systems it might be  usr var postgres   To make sure this is the problem  look at the log file  server log   On the last lines you will see        FATAL   lock file  postmaster pid  already exists   HINT   Is another postmaster  PID 347  running in data directory   usr local var postgres      If so  rm postmaster pid Restart your server  On a mac using launchctl  with homebrew  the following commands will restart the server   launchctl unload homebrew mxcl postgresql plist   launchctl load -w homebrew mxcl postgresql plist   OR on newer versions of Brew   brew services restart postgresql

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The Homebrew package manager includes launchctl plists to start automatically  For more information run brew info postgres   Start manually   pg ctl -D  usr local var postgres start  Stop manually   pg ctl -D  usr local var postgres stop  Start automatically    To have launchd start postgresql now and restart at login    brew services start postgresql

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check the file postgresql conf  on ubuntu is in  etc postgresql X X main postgresql conf   and look for the line that says   listen addresses  localhost    try change it to   listen addresses       it would be accepting every IP s  next check the line that says   port 5432   and check if is the same port of your database yml  by default on my postgresql-9 2 use 5433 instead 5432  don t forget to restart the postgres server    Good Luck

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My problem was in my application yml file   My database url on heroku was not using port 5342   Check your heroku config var DATABASE URL   Make sure that matches exactly with was in your application yml for the applicable database

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To fix these type of issues with Postgres and to work with Postgres on Mac OSX  this is probably the BEST and the EASIEST solution that I have found so far   http   postgresapp com   Just download  install and be happy

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I had the same problem in production  development everything worked    in my case the DB server is not on the same machine as the app  so finally what worked is just to migrate by writing   bundle exec rake db migrate RAILS ENV production   and then restart the server and everything worked

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Chris Slade s answer helped me  I wrote a little script to kill those remaining processes if usefull  kill postgres       if       -eq  quot  quot      then     echo  quot Usage   kill postgres  lt db name gt   to kill remaining instances  Eg   kill postgres my app development   quot    else     gksudo echo  quot Granted sudo quot      pids  quot   ps xa   grep postgres   grep      awk   print  1     xargs  quot      if     pids -eq  quot  quot      then       echo  quot Nothing to kill quot      else       for pid in  quot   pids     quot        do         echo  quot Killing   pid  quot          sudo kill  pid         echo  quot Killed   pid  quot        done       kill postgres        fi   fi

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I ran into this error after following a brew upgrade in which postgresql was updated  I found exactly how to fix my problem from this great post  I was able to get postgres back up and running and even migrated over all my existing databases  https   coderwall com p ti4amw how-to-launch-postgresql-after-upgrade

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You probably restarted your computer and forgot to launch the Postgres app

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If you hit this problem after doing a brew upgrade which upgraded postgres to a new major version  f ex 9 3 0 to 9 4 0 or higher   then do this    dmitrygusev s fix from https   github com Homebrew homebrew issues 35240 Following official  Postgresql  migration guide helped  brew switch postgres 9 3 5      presuming you already installed 9 4 1 pg dumpall  gt  outputfile launchctl unload   Library LaunchAgents homebrew mxcl postgresql plist mv  usr local var postgres  usr local var postgres old brew switch postgres 9 4 1 initdb -D  usr local var postgres psql -d postgres -f outputfile  That s all  Check if import went well  then delete backups  rm outputfile rm -Rf  usr local var postgres old   The issue here is that on a major version upgrade of postgres  it s necessary to recreate migrate your database  And possibly chown directories or manually call initdb  See also  How to upgrade PostgreSQL from version 9 6 to version 10 1 without losing data   Some other tips  that might come in handy  in case you re not using Homebrew  Stop PG server manually  pg ctl -D  usr local var postgres -l  usr local var postgres server log stop Start PG server manually  pg ctl -D  usr local var postgres -l  usr local var postgres server log start

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For MacOS I use this  brew info postgres  And in output in the most end  I see      To have launchd start postgresql now and restart at login    brew services start postgresql Or  if you don t want need a background service you can just run    pg ctl -D  usr local var postgres start  So I just use this command pg ctl -D  usr local var postgres start  and psql begin work

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I have managed to solve the problem by following the Chris Slade s answer  but to restart the server  I had to use the following commands   launchctl unload   Library LaunchAgents homebrew mxcl postgresql plist  launchctl load   Library LaunchAgents homebrew mxcl postgresql plist   that I found here  pjammer s answer down at the bottom

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I had to reinstall my postgres  great instructions outlined here  https   medium com  zowoodward effectively-uninstall-and-reinstall-psql-with-homebrew-on-osx-fabbc45c5d9d  Then I had to create postgres user   usr local opt postgres bin createuser -s postgres  This approach will clobber all of your local data so please back up your data if needed

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You would need to restart the Postgresql Server  If you are using ubuntu you can restart Postgresql by following command sudo service postgresql restart

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I had the same problem  I Check the last line of PostgreSQL log files in  var log postgresql  There was an unrecognized configuration parameter in file  etc postgresql 9 5 main postgresql conf  Commenting the error line in postgresql conf resolved my problem

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You don t have to delete the postmaster pid file  as this might be inviting data corruption   Option  Simply kill the process  do not use kill -9  just an ordinary kill will do    Then just restart the postgres server and you re good to go   Here are the steps to achieve that    Locate and open the postmaster pid file  mine is on Mac Sierra   vi   Library Application  Support Postgres var-10 postmaster pid Copy the PID - it s the number on the first line of the postmaster pid file Kill the process with kill PID  eg  if my PID is 381  I will do kill 381 Restart Postres - if using brew  do brew services start postgresql  Or if using postgresapp  just simply click the start button

User · Answer

put host  localhost in database yml file and run this command   rake db create db migrate

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I just run this command sudo service postgresql restart and everything worked again

User · Answer

I just had this problem tonight  working on a rails application I ve been working on for a while  My problem simply came down to the fact that my postgresql server was not running    I went to the top of the screen  I m on a Mac  and clicked the little elephant icon and clicked  Start    Turns our the server wasn t on   Hopefully this provides a simple solution for someone

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In my case there was permissions issue  When I see logs I found out the issue  Run cat  usr local var log postgres log   I found out 2020-07-17 15 08 47 495 PKT  16282  FATAL   data directory  quot  usr local var postgres quot  has invalid permissions 2020-07-17 15 08 47 495 PKT  16282  DETAIL   Permissions should be u rwx  0700  or u rwx g rx  0750    I just ran sudo chmod -R 700  usr local var postgres  It worked

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As described by  Magne  the error PG  ConnectionBad - could not connect to server  Connection refused can be presented following a major minor version upgrade  e g  9 5 - gt  9 6 or 9 - gt  10  of PostgreSQL  I got this error after having run brew upgrade postgresql after the release of PostgreSQL version 9 6  The problem is that major minor version upgrades require additional steps to migrate old date to the new version  How to check if this is your problem You can check if this is the problem by checking the latest brew formula PostgreSQL version installed with homebrew      brew info postgresql   usr local Cellar postgresql 9 5 4 1  3 147 files  35M  Poured from bottle on 2016-10-14 at 13 33 28  usr local Cellar postgresql 9 6 1  3 242 files  36 4M    Poured from bottle on 2017-02-06 at 12 41 00     and then comparing it to the current PG VERSION   cat  usr local var postgres PG VERSION 9 5  If the PG VERSION is less than the latest brew formula and the difference is a major minor version change  then this is probably your problem  How to fix  i e  how to upgrade the data  Instructions below are for an upgrade from 9 5 to 9 6  Change the version numbers as appropriate for your own upgrade Step 1  Make sure PostgreSQL is switched off    launchctl unload   Library LaunchAgents homebrew mxcl postgresql plist   or  with Homebrew      brew services stop postgresql  Step 2  Make a new pristine database    initdb  usr local var postgres9 6 -E utf8  Step 3  Check what the old and new binary versions are    ls  usr local Cellar postgresql  9 5 3   9 5 4   9 6 1  Note that in this example I am upgrading from 9 5 4 binary to 9 6 1 binary Step 4  Migrate the current data to the new database using the pg upgrade utility    pg upgrade     -d  usr local var postgres     -D  usr local var postgres9 6     -b  usr local Cellar postgresql 9 5 4 bin      -B  usr local Cellar postgresql 9 6 1 bin      -v   -d flag specifies the current data directory -D flag specifies the new data directory to be created -b specifies the old binary -B specifies the new binary we re upgrading to  Step 5  Move the old data directory out of the way   mv  usr local var postgres  usr local var postgres9 5  Step 6  Move newly created data directory to where PostgreSQL expects it to be   mv  usr local var postgres9 6  usr local var postgres  Step 7  Start PostgreSQL again   launchctl load   Library LaunchAgents homebrew mxcl postgresql plist   or  if you re running a current version of Homebrew   brew services start postgresql  Step 8  If you   re using the pg gem for Rails  you should recompile by uninstalling and reinstalling the gem  skip this step if you re not using the pg gem    gem uninstall pg   gem install pg  Step 9  optional  After you ve reassured yourself that everything is working OK  you can run regain some disk space with the following command  brew cleanup postgresql     and if you re feeling really brave you can delete the old PostgreSQL data directory with the following command rm -rf  usr local var postgres9 5    This answer is based on an excellent blog post https   keita blog 2016 01 09 homebrew-and-postgresql-9-5  with some additions

User · Answer

This issue comes when postgres doesn t shut down properly  Here is how I resolved this issue in three simple steps   Step 1  Go to your postgres directory  Mac Users will find this in  usr local var postgres  others might look at  usr var postgres    Step 2  Remove  pid file by running this command   rm postmaster pid   Step 3  Restart your server  Mac Users  brew services restart postgresql   Linux Users  sudo service postgresql restart   Finally restart your app and you are good to go

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