docbrown/docs/installation/mac.md

---
title: macOS
---

# Installing DEV on macOS

## Installing prerequisites

### Ruby

1. If you don't already have a Ruby version manager, we highly recommend
   [rbenv](https://github.com/rbenv/rbenv). Please follow their
   [installation guide](https://github.com/rbenv/rbenv#installation).
2. With the Ruby version manager, install the Ruby version listed on our badge.
   (i.e. with rbenv: `rbenv install 2.6.5`)

### Yarn

Please refer to their [installation guide](https://yarnpkg.com/en/docs/install).

### PostgreSQL

DEV requires PostgreSQL version 9.4 or higher. The easiest way to get started is
to use [Postgres.app](https://postgresapp.com/). Alternatively, check out the
official [PostgreSQL](https://www.postgresql.org/) site for more installation
options.

For additional configuration options, check our
[PostgreSQL setup guide](/installation/postgresql).

### ImageMagick

DEV uses [ImageMagick](https://imagemagick.org/) to manipulate images on upload.

You can install ImageMagick with `brew install imagemagick`.

### Redis

DEV requires Redis version 4.0 or higher.

We recommend using [Homebrew](https://brew.sh):

```shell
brew install redis
```

you can follow the post installation instructions, we recommend using
`brew services` to start Redis in the background:

```shell
brew services start redis
```

You can test if it's up and running by issuing the following command:

```shell
redis-cli ping
```

### Elasticsearch

DEV requires Elasticsearch version 7 or higher.

You have the option of installing Elasticsearch with Homebrew or through an
archive. We recommend installing from archive on Mac.

### Installing Elasticsearch from the archive

The following directions were
[taken from the Elasticsearch docs themselves](https://www.elastic.co/guide/en/elasticsearch/reference/7.5/targz.html#install-macos),
so check those out if you run into any issues or want further information. Make
sure to download **the OSS version** of Elasticsearch, `elasticsearch-oss`.

Please note that you will need `wget` in order to proceed with this installation
(`brew install wget`).

```shell
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-7.5.2-darwin-x86_64.tar.gz
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-7.5.2-darwin-x86_64.tar.gz.sha512
shasum -a 512 -c elasticsearch-oss-7.5.2-darwin-x86_64.tar.gz.sha512
tar -xzf elasticsearch-oss-7.5.2-darwin-x86_64.tar.gz
cd elasticsearch-7.5.2/
```

To start elasticsearch:

```shell
./bin/elasticsearch
```

To start elasticsearch as a daemonized process:

```shell
./bin/elasticsearch -d
```

### Installing Elasticsearch with Homebrew

The following directions were
[taken from the Elasticsearch docs](https://www.elastic.co/guide/en/elasticsearch/reference/current/brew.html).

```shell
brew tap elastic/tap
brew install elastic/tap/elasticsearch-oss
```

After installation you can manually test if the Elasticsearch server starts by
issuing the command `elasticsearch` in the shell. You can then start the server
as a service with `brew services start elastic/tap/elasticsearch-oss`.

You can find further info on your local Elasticsearch installation by typing
`brew info elastic/tap/elasticsearch-oss`.

#### Troubleshooting startup issues

Two possible startup issues you might encounter:

- `java.nio.file.FileSystemLoopException`:

```text
Exception in thread "main" org.elasticsearch.bootstrap.BootstrapException: java.nio.file.FileSystemLoopException: /usr/local/etc/elasticsearch/elasticsearch
Likely root cause: java.nio.file.FileSystemLoopException: /usr/local/etc/elasticsearch/elasticsearch
```

This happens because the installation of Elasticsearch might have a recursive link in the
configuration directory causing the infinite loop:

```shell
> ll /usr/local/etc/elasticsearch
elasticsearch -> /usr/local/etc/elasticsearch
```

By manually removing the link with
`rm -i /usr/local/etc/elasticsearch/elasticsearch` the issue should be fixed.

- `java.lang.IllegalStateException`:

```text
java.lang.IllegalStateException: Could not load plugin descriptor for plugin directory [plugins]
Likely root cause: java.nio.file.NoSuchFileException: /usr/local/Cellar/elasticsearch-oss/7.6.0/libexec/plugins/plugins/plugin-descriptor.properties
```

This happens for a similar reason as the previous error, the installation might
create a recursive link in the plugins directory.

```shell
> ll /usr/local/var/elasticsearch/plugins
plugins -> /usr/local/var/elasticsearch/plugins
```

By manually removing the link with
`rm -i /usr/local/var/elasticsearch/plugins/plugins` the issue should be fixed.

### Testing if Elasticsearch is running

Once installed and started you can test if it's up and running correctly by
issuing the following command:

```shell
curl http://localhost:9200
```

You should receive in response a JSON document containing some information about
your local Elasticsearch installation, for example:

```json
{
  "name": "hostname",
  "cluster_name": "elasticsearch_...",
  "cluster_uuid": "...",
  "version": {
    "number": "7.6.0",
    "build_flavor": "oss",
    "build_type": "tar",
    "build_hash": "7f634e9f44834fbc12724506cc1da681b0c3b1e3",
    "build_date": "2020-02-06T00:09:00.449973Z",
    "build_snapshot": false,
    "lucene_version": "8.4.0",
    "minimum_wire_compatibility_version": "6.8.0",
    "minimum_index_compatibility_version": "6.0.0-beta1"
  },
  "tagline": "You Know, for Search"
}
```

## Installing DEV

1. Fork DEV's repository, e.g. <https://github.com/thepracticaldev/dev.to/fork>
2. Clone your forked repository in one of two ways:

   - e.g. with HTTPS: `git clone https://github.com/<your-username>/dev.to.git`
   - e.g. with SSH: `git clone git@github.com:<your-username>/dev.to.git`

3. Install bundler with `gem install bundler`
4. Set up your environment variables/secrets

   - Take a look at `Envfile` to see all the `ENV` variables we use and the fake
     default provided for any missing keys.
   - The [backend guide](/backend) will show you how to get free API keys for
     additional services that may be required to run certain parts of the app.
   - For any key that you wish to enter/replace, follow the steps below. At a
     minimum, you'll need to get your own free
     [Algolia credentials](/backend/algolia) to get your development environment
     running.

     1. Create `config/application.yml` by copying from the provided template
        (i.e. with bash:
        `cp config/sample_application.yml config/application.yml`). This is a
        personal file that is ignored in git.
     2. Obtain the development variable and apply the key you wish to
        enter/replace. i.e.:

     ```shell
     GITHUB_KEY: "SOME_REAL_SECURE_KEY_HERE"
     GITHUB_SECRET: "ANOTHER_REAL_SECURE_KEY_HERE"
     ```

   - If you are missing `ENV` variables on bootup, the
     [envied](https://rubygems.org/gems/envied) gem will alert you with messages
     similar to
     `'error_on_missing_variables!': The following environment variables should be set: A_MISSING_KEY.`.
   - You do not need "real" keys for basic development. Some features require
     certain keys, so you may be able to add them as you go.

5. Run `bin/setup`

### Possible error messages

**Error:**
`__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called`

**_Solution:_** Run the command `export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES`
(or `set -x OBJC_DISABLE_INITIALIZE_FORK_SAFETY YES` in fish shell)

---

**Error:** `User does not have CONNECT privilege.`

**_Solution:_** Complete the steps outlined in the
[PostgreSQL setup guide](/installation/postgresql).

---

**Error:**
`rbenv: version '<version number>' is not installed (set by /Path/To/Local/Repository/.ruby-version)`

**_Solution:_** Run the command `rbenv install <version number>`

---

**Error:** `ruby-build: definition not found: <version number>` when `rbenv` was
installed via `brew`.

```shell
ruby-build: definition not found: <version number>

See all available versions with `rbenv install --list`.
If the version you need is missing, try upgrading ruby-build:
```

**_Solution:_** Run the following to update `ruby-build`,
`brew update && brew upgrade ruby-build`. After that, rerun
`rbenv install <version number>` and that version will get installed.

---

**Error:**

```shell
== Preparing database ==
    Sorry, you can't use byebug without Readline. To solve this, you need to
    rebuild Ruby with Readline support. If using Ubuntu, try `sudo apt-get
    install libreadline-dev` and then reinstall your Ruby.
rails aborted!
LoadError: dlopen(/Users/<username>/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin18/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.<some version number>.dylib
```

**_Solution:_** Run
`ln -s /usr/local/opt/readline/lib/libreadline.dylib /usr/local/opt/readline/lib/libreadline.<some version number>.dylib`
from the command line then run `bin/setup` again. You may have a different
version of libreadline, so replace `<some version number>` with the version that
errored.

---

**Error:**

```shell
PG::Error: ERROR:  invalid value for parameter "TimeZone": "UTC"
: SET time zone 'UTC'
```

**_Solution:_** Restart your Postgres.app, or, if you installed PostgreSQL with
Homebrew, restart with:

```shell
brew services restart postgresql
```

If that doesn't work, reboot your Mac.

---

**Error:**

```shell
ERROR:  Error installing pg:
  ERROR: Failed to build gem native extension.
  [...]
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
```

**_Solution:_** You may encounter this when installing PostgreSQL with the
Postgres.app. Try restarting the app and reinitializing the database. If that
doesn't work, install PostgreSQL with Homebrew instead:
`brew install postgresql`

---

> If you encountered any errors that you subsequently resolved, **please
> consider updating this section** with your errors and their solutions.