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Installing pgAdmin Only after installing PostgreSQL with Homebrew Part 2

Maria Campbell
・5 min read

postgresql

This post assumes that you have already backed up your existing databases somewhere (if you cared about them!). I will not be going over those steps.

This post was originally published on my developer blog June 17, 2018.

Getting to know the tools you use as a developer is just as important as learning to program. If you don’t know how to use them properly, your programming will suffer!

Which takes me back to my battle with PostgreSQL on my machine in a way that suited my needs.

As I had mentioned in my previous post, I wanted the ability to play around with PostgreSQL and view it in a Graphical User Interface (GUI), but also have all the features of a Homebrew install. Unfortunately, I had initially stumbled clumsily and imperfectly through the process, making a few errors along the way. Part of it actually had to do with the (relatively new) Migration Assistant on Mac OSX. It had screwed up my PostgreSQL install when it was migrated to my current machine, and getting rid of all traces of my download(s) from postgresql.org was a bit of a challenge. It involved getting rid of the standard account which had been created by the Migration Assistant during the restoration of my data and subsequent migration to my new computer, getting rid of the install I had made yesterday, re-installing PostgreSQL with Homebrew, and making sure that I added a postgres user afterwards that contained a password (it does not by default).

Uninstalling the postgresql.org install

To uninstall the postgresql.org install, click on your Macintosh HD icon on your desktop, go into Library folder, and then into your PostgreSQL folder which resides inside the Library folder. Inside, you will see something called the PostgreSQL uninstaller. Click on that to uninstall PostgreSQL from your machine. At the end, it will tell you that the uninstall is complete, but that your data was not removed. You have to move the PostgreSQL folder and the remaining contents into the trash. When doing so, you will be prompted to input your administrator password. When you do that, the folder will be moved to the trash.

Installing PostgreSQL with Homebrew

Installing PostgreSQL with Homebrew is very easy. First make sure, of course, that you do have Homebrew installed! To check whether you indeed have Homebew installed, type the following command in Terminal:

brew update
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If this command returns results, that means Homebrew has been installed on your machine. If no results are returned, you do not. To install Homebrew, please visit the Homebrew site:

Homebrew Site

Once you have Homebrew installed, do the following:

brew update
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This just makes sure that Homebrew is up to date. it is just best practice to run this command before installing a program with Homebrew. Next, run the following command to install PostgreSQL:

brew install postgresql
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After the install has been completed, run the following command to get PostgreSQL up and running:

brew services start postgresql
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This command will start your postgres server. No fuss no muss! To stop the postgres server, run the following command:

brew services stop postgresql
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But don’t do that just yet!

Run the following command:

psql
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to log into PostgreSQL. The beautiful thing about a Homebrew install is that you can simply use your native Terminal window you use for controlling your machine instead of the Sql shell that comes with the postgresql.org install. That is just an extra painful step that takes up more time to execute.

I love using my shortname for local development. But I can’t use it to log into pgAdmin! By default, Homebrew only sets up the account you create with the

createdb `whoami`
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command.

Creating the default postgres user needed for pgAdmin

You have to create a second user called postgres in order to be able to connect with and log in to pgAdmin. To create the postgres user, type the following command in Terminal while still logged in to postgres:

createuser -s postgres
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This will create a postgres superuser. Then type the following command to make sure that this user has indeed been created:

\du
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This command returns the list of users you have available to you in your PostgreSQL install.

There is still one last step to the process in order to make connection with pgAdmin possible. You have to create a password for the postgres user you just created. By default, the user is created without a password with the command I provided here. To create a password for the postgres user, run the following command while still logged in to PostgreSQL:

ALTER USER  postgres  WITH PASSWORD ‘password’;
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Just replace password with whatever password you want to assign.

THEN, you will want to install pgAdmin on your machine. Go to the pgAdmin website to download the GUI:

pgAdmin website

After the download has been completed, click on the dmg (disk image file) in your downloads folder to open up the application and install it. A window will pop up with the PostgreSQL icon. Drag the icon into your applications folder. This will install it in your applications folder.

Next, you want to make sure that you are logged in to postgres with your postgres user in order to be able to log in and connect with pgAdmin. You are not logged in by default into user postgres when you install postgres with Homebrew. This is what confused me at first. It made me think that I couldn’t connect with pgAdmin with a Homebrew install. All you have to do is use a different command to log in to another user:

psql -U postgres
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psql defaults to your user account name. In this case, it is the user account shortname on your machine. The command here says to log in with the -U (user) postgres.

Logging into pgAdmin

Once you are logged in to postgres with user postgres, go into your Applications folder and click on the pgAdmin icon. It will open up in a new tab in your favorite browser.

When it has completed loading, click on the Servers tab to the left in the browser window under Browser. a new tab called PostgreSQL 10 (or whatever version you have on your machine) will appear. Click on that.

Now a connect to server modal will appear, in which you are prompted to enter your password for your user postgres so as to connect to the server:

Please enter the password for the user 'postgres' to connect the server - "PostgreSQL 10"
Password
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Now you understand the importance of having a user called postgres with a dedicated password!

Once you provide your postgres password and click on the OK button, you will be logged in to pgAdmin, and are good to go! You will even see all your user databases and any others you might have created along the way!

Happy databasing with PostgreSQL!

Completely Uninstall and Reinstall PSQL on OSX

pgAdmin.org

psql: FATAL: role “postgres” does not exist

Uninstall Postgres 10 on macOS – EnterpriseDB installer

Discussion (6)

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bgadrian profile image
Adrian B.G.

Or ... you can install the DB and the admin using docker.

I have not tested these commands, but I just want to give an example how easy it is. I apply the same technique for mysql, mongoDB and postgres, around 10 bash commands to install/update all of them, and their admins, and it works on any OS (I use more of them).

#https://hub.docker.com/_/postgres/
#create a permanent volume, so the data will not be lost when you do docker rm postgres
docker volume create pgdata

#download, "install", and run the DB inside a container
docker run --name postgres -e POSTGRES_PASSWORD=root -v pgdata:/var/lib/postgresql/data -d postgres

#download, "install", and run the pgadmin 
docker run --name postgresadmin -p 8082:5050 --link postgres:postgres -d fenglc/pgadmin4

I use docker for my dev setup for a few years and it is a great experience, I can switch between technology stacks without polluting my system, or care about what OS I'm on now, unlike homebrew, apt-get or chocolatey, docker commands run are the same.
I don't need to handle different versions of languages, libs, compilation errors, dependencies, and so on.

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Maria Campbell Author

Maybe I will look into it sometime when the need is there. Have heard good things about it. Thanks for sharing!

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kyslik profile image
Martin Kiesel • Edited

I wish there was pg support for Sequel Pro, now I use DataGrip for pg related projects.


Instead of only linking to the brew homepage you could include the one-line command right in the article

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

For more details visit the brew homepage - brew.sh

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leonardo_fettucciari_3cb5 profile image
Leonardo Fettucciari

Just made an account to thank you for this post: MacOS BigSur bugged my PgAdmin4 installed through normal PostgreSQL dmg. This has fixed everything and is so satisfying, thank you!

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anjanesh profile image
Anjanesh Lekshminarayanan

I finally got my Postgres + pgAdmin solved. Thanks.

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ecalzo profile image
Evan Calzolaio

This was really helpful, thank you!