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You have to specify the name of the cluster and the version of PostgreSQL the server will be running. > config /usr/local/etc/postgresql/9.3/main > data /usr/local/var/lib/postgresql/9.3/main > locale en_US.UTF-8 > port 5432 You can create a new cluster with pg_createcluster, like that: $ pg_createcluster 9.3 main > Creating new cluster 9.3/main. postgresql-common package provides special wrapper scripts for running server-side operations, such as managing the clusters. Please note, that in PostgreSQL term “database cluster” does not mean “group of database servers” - simply put, it’s a set of databases managed by a single server.
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We now have to create a few database clusters.
Mac os switch user postgres install#
I find the last way the easiest one, so let’s do that! You have to install the postrgresql-common package (for macOS users: it's in the tap we added earlier) and you're set-you have the all the things installed, let's advance! explicitly running the desired binaries, e.g.Since we have all the versions we need installed, we now need a nice and easy way of using the one we actually need at the moment. Just install the versioned PostgreSQL packages using your package manager and that’s it! You should still get rid of postgresql if you had it installed before. If you had the default postgresql package already installed, you might encounter some issues later on, so it would be best to get rid of it: $ brew uninstall postrgresql Linux Now you can install multiple versions of PostgreSQL on your machine: $ brew install postgresql-9.3 $ brew install postgresql-9.6 You have to tap this repo by running: $ brew tap petere/postgresql The easiest way of installing multiple versions of PostgreSQL on macOS is using Homebrew - you should be familiar with this package manager, so I won’t go into details here. So how do you setup an environment which enables you to install and use multiple versions of PostgreSQL simultaneously? I’m going to guide you through the process in a few easy steps! macOS If you are working on many projects at once, it might save you from some nasty bugs! Setup TL DR You might not need to run multiple PostgreSQL versions if you are working on a single project. In many cases, each project requires specific versions of the tools to run properly. The situation complicates even more in case you are working on several projects simultaneously (even if talking about some pet-projects on the side). Major WTF?! moment incoming! This is because sometimes it’s possible to run the app with different dependencies installed across different environments, which might lead to super-weird and hard to track bugs. Sometimes you can just move on, install some new dependencies and not worry about the others, and everything works fine… Until it doesn’t.
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This might complicate a bit in case you are then switching to a new project, but want to keep the old versions in place. The answer is pretty simple and straightforward: if you are working on a single project at a time, you might not need to bother at all! You could just install the required versions of the dependencies and you would be done. On the other hand, I’ve been introduced to rbenv on the day one!īut before we continue to the heart of this article, I’d like to answer some questions that I found asking myself in the early days of my webdev path: “ Why should I have multiple versions of a given tool installed? Do I really need to bother with such version managers?”.
Mac os switch user postgres professional#
The only thing that I feel is being left behind is the database - I’ve never heard about any dedicated solutions for managing database versions ( PostgreSQL specifically) since the beginning of my professional career. RVM/ rbenv/ chruby for Ruby, Bundler for gems, nvm/ n for Node and npm/ yarn for managing JavaScript packages… And these work pretty well, so we are covered there - we can work on multiple projects, each using the required versions of its dependencies. Fortunately, most of the core tools have their respective version managers, e.g.
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They all come in variety of versions, and sometimes we do want to have multiple versions installed, and even running, side by side. For a web developer specialising in Ruby on Rails apps, such as me, the most important are: the language itself ( Ruby), Ruby on Rails framework, Node.js framework and some database ( PostgreSQL FTW!). Nowadays, as programmers, we have loads of different tools for different purposes. Running multiple PostgreSQL versions simultaneously on macOS/Linux Introduction