Postgres could not connect to server

Question

After I did brew update and brew upgrade  my postgres got some problem  I tried to uninstall postgres and install again  but it didn t work as well    This is the error message  I also got this error message when I try to do rake db migrate     psql psql  could not connect to server  No such file or directory     Is the server running locally and accepting     connections on Unix domain socket   tmp  s PGSQL 5432     How can I solve it   Mac version       Mountain lion   homebrew version  0 9 3  postgres version  psql  PostgreSQL  9 2 1  And this is what I did   12 30   D works  brew uninstall postgresql Uninstalling  usr local Cellar postgresql 9 2 1    12 31   D works  brew uninstall postgresql Uninstalling  usr local Cellar postgresql 9 1 4    12 31   D works  psql --version bash   usr local bin psql  No such file or directory 12 33   D works  brew install postgresql    gt  Downloading http   ftp postgresql org pub source v9 2 1 postgresql-9 2 1 tar bz2 Already downloaded   Library Caches Homebrew postgresql-9 2 1 tar bz2                  gt  Summary  usr local Cellar postgresql 9 2 1  2814 files  38M  built in 2 7 minutes 12 37   D works  initdb  usr local var postgres -E utf8 The files belonging to this database system will be owned by user  laigary   This user must also own the server process   The database cluster will be initialized with locale  en US UTF-8   The default text search configuration will be set to  english    initdb  directory   usr local var postgres  exists but is not empty If you want to create a new database system  either remove or empty the directory   usr local var postgres  or run initdb with an argument other than   usr local var postgres   12 39   D works  mkdir -p   Library LaunchAgents 12 39   D works    cp  usr local Cellar postgresql 9 2 1 homebrew mxcl postgresql plist   Library LaunchAgents  12 39   D works    launchctl load -w   Library LaunchAgents homebrew mxcl postgresql plist homebrew mxcl postgresql  Already loaded 12 39   D works  pg ctl -D  usr local var postgres -l  usr local var postgres server log start server starting 12 39   D works  env ARCHFLAGS  -arch x86 64  gem install pg Building native extensions   This could take a while    Successfully installed pg-0 14 1 1 gem installed 12 42   D works  psql --version psql  PostgreSQL  9 2 1 12 42   D works  psql psql  could not connect to server  No such file or directory     Is the server running locally and accepting     connections on Unix domain socket   tmp  s PGSQL 5432     Now  after I reinstalled howbrew when I use   psql  It doesn t show any error message   But I run rake db migrate in my rails app  it shows   could not connect to server  No such file or directory     Is the server running locally and accepting     connections on Unix domain socket   var pgsql socket  s PGSQL 5432    usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters postgresql adapter rb 1213 in  initialize   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters postgresql adapter rb 1213 in  new   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters postgresql adapter rb 1213 in  connect   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters postgresql adapter rb 329 in  initialize   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters postgresql adapter rb 28 in  new   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters postgresql adapter rb 28 in  postgresql connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 309 in  new connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 319 in  checkout new connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 241 in  block  2 levels  in checkout   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 236 in  loop   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 236 in  block in checkout   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 monitor rb 211 in  mon synchronize   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 233 in  checkout   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 96 in  block in connection   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 monitor rb 211 in  mon synchronize   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 95 in  connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection pool rb 404 in  retrieve connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection specification rb 170 in  retrieve connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record connection adapters abstract connection specification rb 144 in  connection   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record railties databases rake 107 in  rescue in create database   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record railties databases rake 51 in  create database   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record railties databases rake 40 in  block  3 levels  in  lt top  required  gt    usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record railties databases rake 40 in  each   usr local Cellar ruby 1 9 3-p327 lib ruby gems 1 9 1 gems activerecord-3 2 8 lib active record railties databases rake 40 in  block  2 levels  in  lt top  required  gt    usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 205 in  call   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 205 in  block in execute   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 200 in  each   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 200 in  execute   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 158 in  block in invoke with call chain   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 monitor rb 211 in  mon synchronize   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 151 in  invoke with call chain   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake task rb 144 in  invoke   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 116 in  invoke task   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 94 in  block  2 levels  in top level   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 94 in  each   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 94 in  block in top level   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 133 in  standard exception handling   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 88 in  top level   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 66 in  block in run   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 133 in  standard exception handling   usr local Cellar ruby 1 9 3-p327 lib ruby 1 9 1 rake application rb 63 in  run   usr local bin rake 32 in   lt main gt   Couldn t create database for   adapter   gt  postgresql    encoding   gt  unicode    database   gt  riy development    pool   gt 5   username   gt nil   password   gt nil    Finally I find the solution     sudo mkdir  var pgsql socket    sudo ln -s  private tmp  s PGSQL 5432  var pgsql socket    This solution is little tricky  but it works  Hope anyone have a better solution  Update  This works for me as well   rm  usr local var postgres postmaster pid

User · Answer

I used the Bitnami stack and installed as non-root user psql. On using psql I did receive the mentioned error.

Turns out, there are 2 versions of psql

a root level psql prepackaged in the linux distro. This points to /usr/bin/psql
a non-root level psql installed by the Bitnami stack. This points to /bitnami/postgresql/postgresql/bin/psql

You might want to change the alias of the psql, so that it points to the non-root user.

alias psql='/bitnami/postgresql/postgresql/bin/psql'

The above worked for me on doing psql -U postgres

User · Answer

brew services start postgres    worked for me

User · Answer

Just two steps to run the database after the Installation  Before that ensure your logged as postgres user   Installed-Dirs bin postmaster -D Installed-Dirs pgsql data  For an example   postgres localhost bin    usr local pgsql bin postmaster -D  usr local pgsql data  Step-2   Run psql from the Installed path  To check where you installed   which postgres  will use to find out the installed location   postgres localhost bin   psql

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On Yosemite  if the pid file is blocking Postgres from starting and you have a launchctl daemon trying  and failing  to load the database daemons  then you ll need to unload the plist file    launchctl unload   Library LaunchAgents homebrew mxcl postgresql plist  Then remove the pid file   rm  usr local var postgres postmaster pid  Then reload the launchctl daemon   launchctl load   Library LaunchAgents homebrew mxcl postgresql plist

User · Answer

For me it was an apache upgrade that caused the problem  I could still run psql in console or call db directly from kdevelop  Also it worked to add  host localhost  to connection string   BUT the real problem was that apache had changed to private tmp   Solution  Update  usr lib systemd system apache2 service and change PrivateTmp true to PrivateTmp false   I am working on OpenSuse OS  but I guess that something similar could happen on Mac

User · Answer

Upgrading the database works for me   brew postgresql-upgrade-database

User · Answer

Check that the socket file exists     ls -l  tmp  s PGSQL 5432 srwxrwxrwx  1 you  wheel  0 Nov 16 09 22  tmp  s PGSQL 5432   If it doesn t then check your postgresql conf for unix socket directory change     grep unix socket  usr local var postgres postgresql conf  unix socket directory             change requires restart   unix socket group                 change requires restart   unix socket permissions   0777       begin with 0 to use octal notation

User · Answer

I have macOS Catalina  10 15 6  and PostgreSQL 12  When I run brew services start postgresql  brew said it start PostgreSQL without problem  but it does not show when I get ps auxw   grep post  To solve it  I install Postgres app from this link  and install and press Init button  It will find your databases and show it to you

User · Answer

The Cause  Lion comes with a version of postgres already installed and uses those binaries by default  In general you can get around this by using the full path to the homebrew postgres binaries but there may be still issues with other programs   The Solution  curl http   nextmarvel net blog downloads fixBrewLionPostgres sh   sh   Via  http   nextmarvel net blog 2011 09 brew-install-postgresql-on-os-x-lion

User · Answer

In my case  the trouble was caused by Mac OS updating  Upgrading PostgreSQL solved the issue    upgrade database version solved the trouble   brew postgresql-upgrade-database  However  this error is quite common and has multiple possible reasons  you shouldn   t fully rely on my solution above

User · Answer

Had a similar problem  a pid file was blocking postgres from starting up  To fix it    rm  usr local var postgres postmaster pid   brew services restart postgresql  and then all is well

User · Answer

I faced the same problem for psql  PostgreSQL  9 6 11  what worked for me - remove postmaster pid  --  rm  usr local var postgresql 9 6 postmaster pid restart postgres  -- brew services restart postgresql 9 6 If this also doesn t work then run -- sudo chmod 700   usr local var postgresql 9 6

User · Answer

Are you recently changed the pg hba conf  if you did just check for any typo in    local  is for Unix domain socket connections only  local   all             all                                     password  IPv4 local connections   host    all             all             127 0 0 1 32            password  IPv6 local connections   host    all             all               1 128                 password  Sometimes a simple mistake can give us a headache  I hope this help and sorry if my english is no good at all

User · Answer

If installing and uninstalling postgres with brew doesn t work for you  look at the logs of your postgresql installation or   postgres -D  usr local var postgres   if you see this kind of output   LOG   skipping missing configuration file   usr local var postgres postgresql auto conf  FATAL   database files are incompatible with server DETAIL   The data directory was initialized by PostgreSQL version 9 4  which is not compatible with this version 9 6 1    Then try the following   rm -rf  usr local var postgres  amp  amp  initdb  usr local var postgres -E utf8   Then start the server   pg ctl -D  usr local var postgres -l logfile start   Source

User · Answer

What worked for me I had 2 versions of PostgreSQL while running brew services list Name           Status  User           Plist consul         stopped                 docker-machine stopped                 mysql          stopped                 postgresql     started homebrew mxcl postgresql plist postgresql 9 6 stopped                 redis          stopped                 runit          stopped                 unbound        stopped                 vault          stopped   and just launched the other version brew services start postgresql 9 6

User · Answer

This happens when postgres server is not running   Steps to properly install Postgres via Homebrew on MAC     brew install postgres initdb  Users  lt username gt  db -E utf8   This initializes postgres to use the given directory as the database directory  Normally it is not adviced to use the user directory for database storage  Edit sudoers file to add initdb and similar commands and then run initdb on  usr local var postgres  pg ctl -D  Users  lt username gt  db -l logfile start  After getting success with step 2 it will prompt to run step 3  This command manually starts the server

User · Answer

I found that after installing the latest patch to Postgres 9 6  all my executables  postgres  psql  pg dump  pg restore etc  got dropped and I had to relink them  Fortunately Homebrew can do this for you   brew link --force postgresql    or in my case   postgresql 9 6

User · Answer

In my case  I was running other project using docker-compose and I had to stop postgresql with sudo service postgresql stop  amp  amp  docker-compose up -d postgres  amp  amp  docker-compose up rails To fix this error in my new project  I just had to run  sudo service postgresql restart and then it just fixed it

User · Answer

After a tremendous amount of back and forth  it really came down to the pg gem version I was using   On mavericks  pg version 0 15 1 would not connect to port 5432 but version 0 17 1 works just fine - very odd

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The problem can also be attributed to a crashed process that left postmaster pid file behind  I do this and work s     brew services stop postgresql   rm  usr local var postgres postmaster pid   adjust path accordingly to your install   brew services start postgresql

User · Answer

This can sometimes be an issue with a postgres upgrade     In my case  it happened when upgrading from 9 3 to 9 4   See http   www postgresql org docs 9 4 static upgrading html  OS X Homebrew   Try running postgres -D  usr local var postgres -- it will give you a much more verbose output if postgres fails to start   In my case  running rm -rf  usr local var postgres  amp  amp  initdb  usr local var postgres -E utf8 removed my old databases and then reinitialized the postgres db schema     Thanks to https   github com Homebrew homebrew issues 35240 for that solution   After regenerating my databases  with rake db create  everything worked fine again

User · Answer

The problem is because there is already a running service on the port 5432 and we cannot establish psql socket connection through this port   I removed the socket file  rm -rf  tmp  s PGSQL 5432    Then I reinitialized postgres services  postgres -D  usr local var postgres   This worked for me

User · Answer

It looks like your psql doesn t run  You should run it before connect  You can do that using Postgres app for Mac OS only   Download and install this app http   postgresapp com  Open the app  and you have a PostgreSQL server ready and awaiting new connections  Close the app  and the server shuts down  You also can find this info here http   www postgresql org download macosx   Hope this will help you

User · Answer

I ran into this issue after trying to restore drop create a db while other processes were accessing them  MacOSX Homebrew fix was    close all other accessing processes rails server  rails console  guard  etc    load unload using the commands found in brew info postgres run restore drop create from before

User · Answer

The most fool proof way around this is to do  brew reinstall postgresql   This will keep your user permission etc all intact and everything is reset to new  Works all the time

User · Answer

Psql option   -h hostname --host hostname    Specifies the host name of the machine on which the server is running  If the value begins with a slash  it is used as the directory for the Unix-domain socket     grep  port  unix socket   etc postgresql 9 1 main postgresql conf port   5433                                            change requires restart  unix socket directory     var run postgresql           change requires resta    netstat -nalp   grep postgres unix  2        ACC       STREAM     LISTENING     106753   4349 postgres        tmp  s PGSQL 5432 unix  2        ACC       STREAM     LISTENING     10377 1031 postgres        var run postgresql  s PGSQL 5433   Run psql with -host Option    psql -p 5433 -h  var run postgresql   No need to make a soft link

User · Answer

I had to fix the permissions for a directory   sudo chmod 0750  usr local var postgres

User · Answer

MacOS Big Sur seemed to renamed the Application  Support folder to ApplicationSupport  So the updated Path would be   Users  lt USERNAME gt  Library ApplicationSupport Postgres var-10   or  quot  var- lt YOUR PG VERSION gt  quot

User · Answer

So i stubled upon this after the rails db create command  Setting up the environment in a macOS Catalina 10 15 3  First thing that i checked was the flow that got me here  After ensuring that that all things had went smoothly and there was no error that might had escaped my mind i tried the most popular solutions from here but none of the seemed to work  So far the only error i was seeing was the   psql psql  could not connect to server  No such file or directory Is the server running locally and accepting connections on Unix domain socket  quot  tmp  s PGSQL 5432 quot   So i needed some more specific information about what was happening  Due to that reason i decided to look at the postgres logfile which is located at  usr local var log postgres log So after opening the log i saw this error LOG   starting PostgreSQL 12 2 on x86 64-apple-darwin19 3 0  compiled by Apple clang version 11 0 0  clang-1100 0 33 17   64-bit LOG   could not translate host name  quot localhost quot   service  quot 5432 quot  to address  nodename nor servname provided  or not known WARNING   could not create listen socket for  quot localhost quot  FATAL   could not create any TCP IP sockets LOG   database system is shut down  So this is a bit more explanatory and specific  The problem is something about that PostgreSQL cannot  quot see quot  and resolve the localhost server  So next thing i did was to check the  etc hosts file whose default contents should look like this       Host Database     localhost is used to configure the loopback interface   when the system is booting   Do not change this entry     127 0 0 1   localhost 255 255 255 255 broadcasthost   1          localhost   After comparing the above with mine i saw that in mine this line was different and commented         1             localhost  So i removed the   symbol in front of the line saved the file and re run the rails db create   and the database was succesfully initiated

User · Answer

If postgres was installed using homebrew  you can fix this by running   brew link postgres

User · Answer

For us  we had to define localhost in the psql command like the following   psql -h localhost -U postgres  Not sure why the -h doesn t default to localhost

User · Answer

The data directory contains an old postmaster pid file   The data directory contains an unreadable postmaster pid file PostgreSQL puts a file named postmaster pid in the data directory to store the process id of the PostgreSQL server process  If PostgreSQL crashes  this file can contain an old pid that confuses PostgreSQL  You can fix this issue by deleting the postmaster pid file  However  you must make sure that PostgreSQL is really not running  Open Activity Monitor and make sure that there are no processes named    postgres    or    postmaster      If you delete the postmaster pid file while PostgreSQL is running  bad things will happen   Source  https   postgresapp com documentation troubleshooting html

User · Answer

This happened to me when I upgraded from 9 3 4 to 9 5 as the databases are incompatible without upgrading   I used pg upgrade as follows   Stop postgres    brew services stop postgresql   Upgrade the databases     pg upgrade      -d  usr local var postgres      -D  usr local var postgres9 5      -b  usr local Cellar postgresql 9 3 4 bin       -B  usr local Cellar postgresql 9 5 0 bin       -v   Archive the old databases      mv  usr local var postgres  usr local var postgres9 3 save    mv  usr local var postgres9 5  usr local var postgres   Restart postgres      brew services start postgresql   Updated Gems  for rails   active record        gem uninstall pg    gem uninstall activerecord-postgresql-adapter    bundle install

User · Answer

One of the cause will be make sure the size of the disk is not full  execute the command postmaster -D path of the postgres

User · Answer

I got same issue because I m using a wrong Postgres s username in code  I logged into postgres psql -d postgres and enter  du to take role name and correct Postgres s username   So when you guys face this issue  you guys need to make sure you re using correct Postgres username  password  hostname and database     Hope this will help anyone

User · Answer

FWIW this happened to me today  but what happened was that I was running Ubuntu updates at the time  which were likely updating Postgres  Once the update completed  I was able to connect without a hitch   For completeness  sake  I was trying to retrieve records from the database from a Rails console   development  main  0  gt  a   MyModel find 73694 PG  ConnectionBad  could not connect to server  No such file or directory         Is the server running locally and accepting         connections on Unix domain socket   var run postgresql  s PGSQL 5432

User · Answer

Had the same problem  Upgrading DB did the trick  postgresql-upgrade-database

User · Answer

This is actually what you are supposed to do   you should instead look at  usr local var postgres postmaster pid  and then look at the first line of the file - this is the bad PID  Run   ps aux   grep  lt PID gt    for example   ps aux   grep 12345   then do  kill  lt PID gt    for example  kill 12345   Assuming it s still running  https   superuser com questions 553045 fatal-lock-file-postmaster-pid-already-exists  do not listen to the accepted answer it is bad and will corrupt your data

User · Answer

I got this same error  Turns out postgres just wasn t running at all  it is usually always running in the background  but for whatever reason it wasn t today     If this is the case  just type postgres in the command line of your project directory

User · Answer

For anyone reading this and using Postgres app  you may need host  localhost in your database yml  http   postgresapp com documentation toc 3

User · Answer

This worked for me  as a mix of previous answers      rm  usr local var postgres postmaster pid    pg ctl -D  usr local var postgres -l  usr local var postgres server log start   Source  https   coderwall com p zf-fww postgres-on-osx-with-homebrew-not-running-after-osx-crash

User · Answer

It is because a previous server a still running  try closing everything down and re-running your application

User · Answer

I simply restarted postgres  brew services restart postgresql  There was no need to remove postmaster pid

User · Answer

If you are facing the issue while upgrading Postgres  or after upgrading   please follow the steps mentioned here to safely transfer data between versions  which will resolve the issue   Upgrade PostgreSQL 9 6 5 to 10 0 using Homebrew  macOS

User · Answer

Changing postresql or database yml config settings  changing  PATH  or creating symlinks were all unnecessary for me  All I needed to do was gem uninstall pg and then bundle  or gem install pg    The issue was that the pg gem had been installed before homebrew postgres  so was picking up the settings from the version of postgres that comes with MacOS  Reinstalling it  and thus rebuilding the native extension  fixed the problem

User · Answer

If you shut down your system without quitting psql  postgres would not have removed some files  I didn t find the file postmaster pid in the location usr local var postgres So I did the below   brew services start postgresql  The above command should let you start postgres

User · Answer

Found a solution that worked for me here   https   dba stackexchange com questions 75214 psql-could-not-connect-to-server-no-such-file-or-directory  You basically run the following command to manually start the server   pg ctl -D  usr local var postgres -l  usr local var postgres server log start

User · Answer

Try   sudo systemctl start postgresql 12-main   Here my postgresql version is 12

User · Answer

For those who use this command and doesn t work or the file is not there and are using Ruby on Rails     rm  usr local var postgres postmaster pid   Or any other command and just keep on failing   I solved this problem uninstalling with Brew  I had to uninstall with brew 2 times  because at the first uninstall there will remain another version of postgresql  with the second uninstall the process will be completed   Install postgresql with Brew  Then drop  create and migrate the data bases of the project   Don t forget to start the postgresql server

User · Answer

Came across this issue too on MacOS Sierra and when we ran pg ctl as described above we then had the following error pg ctl  no database directory specified and environment variable PGDATA unset  So we followed the steps here which solved our issue  namely   mkdir    postgres  initdb    postgres  pg ctl -D    postgres start

[ruby-on-rails] Postgres could not connect to server

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