在Windows上安装Discourse进行开发

[Discourse]

This tutorial has been tested on Windows 10 and 11.

To set up a development environment for Discourse on Windows, you can do it using Windows Subsystem for Linux feature.

This setup requires the WSL 2 installation. It is only available in Windows 10 builds 18917 or higher. We’ll assume that you already installed Windows Subsystem for Linux 2 (Ubuntu) on your Windows 10 system. WARNING: Install Ubuntu 18.04, and not 20.04 since some installations will fail on 20.04. For more information see June 30th, 2020 notes at the bottom of this post.

Let’s begin!

Installing Discourse

1. Initially follow the steps from the topic Beginners Guide to Install Discourse on Ubuntu for Development until the step Clone Discourse.

@techAPJ

Install Discourse Dependencies

You will need the following packages on your system:

• Git
• rbenv or asdf
• ruby-build
• Ruby (latest stable)
• Rails
• PostgreSQL
• SQLite
• Redis
• Node.js
• pnpm
• MailHog**
• ImageMagick**

** optional

Now that we have installed Discourse dependencies, let’s move on to install Discourse itself.

2. Before setting up the database you have to start PostgreSQL service & Redis server manually using following commands

   sudo service postgresql start
   redis-server --daemonize yes
   

3. Then go through all the remaining steps of the Ubuntu guide.

@techAPJ

Clone Discourse

Clone the Discourse repository in ~/discourse folder:

git clone https://github.com/discourse/discourse.git ~/discourse

~ indicates home folder, so Discourse source code will be available in your home folder.

Setup Database

Create role with the same name as your ubuntu system username:

sudo -u postgres createuser -s "$USER"

Bootstrap Discourse

Switch to your Discourse folder:

cd ~/discourse

Install the needed gems

source ~/.bashrc
bundle install

Now that you have successfully installed gems, run these commands:

bundle exec rake db:create
bundle exec rake db:migrate
RAILS_ENV=test bundle exec rake db:create db:migrate

Try running the specs:

bundle exec rake autospec

All the tests should pass.

Start rails server:

bundle exec rails server

You should now be able to connect with your Discourse app on http://localhost:3000 - try it out!

Starting with Discourse 2.5+ EmberCLI is required in development and these additional steps will be required:

In a separate terminal instance, navigate to your discourse folder (cd ~/discourse) and run:

bin/ember-cli

You should now be able to navigate to http://localhost:4200 to see your local Discourse installation.

Creating a Command to Start Discourse

Now your development environment is almost ready. The only problem is every time when you open Ubuntu on Windows you have to start the PostgreSQL service & Redis server manually. Don’t worry we can have a workaround for this by creating a custom command

cd ~

Create a new file using the command nano start-discourse and paste the content below then save and exit.

#!/bin/bash

# to start PostgreSQL
sudo service postgresql start

# to start Redis server
redis-server --daemonize yes

Now modify the CHMOD using below command

chmod +x start-discourse

And copy the file to your bin folder

sudo cp start-discourse /usr/bin/

It’s done. Now, whenever you open the Ubuntu bash just run the command below and start developing

start-discourse

---

Alternatively, if you are using Windows 10 enterprise, pro, or education edition then you can create a Linux virtual machine in hyper-v to set up the Discourse dev environment.

Notes About Windows Environment

As of June 30, 2020:

@AndreaHabib

With the introduction of Windows 10 build 2004 and WSL 2 and many of you might run into some issues since Discourse now requires WSL 2 to actually run.
For starters: If you haven’t already, you would want to update your system to Windows 2004 (19041)
Note: Don’t install using Windows Update in the system settings as you might get errors mid-installation. Also make sure you are on Windows 1903 (18362) or 1909 (18363), you can search winver for that.

• Go to: Download Windows 10
• Click the Update Now button under Windows 10 May 2020 Update to download the update assistant and let it install and finish
• If you get any errors, then download the media creation tool, run it, and create a bootable flash drive (at least 8GB flash) and use it to install Windows.

When you are done with the Windows installation, you will need to manually install WSL 2
But first, we need to make sure that 2 features are enabled:

• Virtual Machine Platform which can be enabled directly from your Windows by going to Programs and Features and then enabling Optional Features in Turn Windows features on or off
• The other is Virtualization which can be only enabled from your BIOS. However this option can vary from one motherboard to the other. eg: on AMD it’s called SVM. So please look up your specific motherboard.

Now that you have both features enabled:

• Install Ubuntu 18.04, and not 20.04 since some installations will fail on 20.04.
• Go here and update Linux Kernel: Link in replies
• Go to this link and follow the steps: Install Windows Subsystem for Linux (WSL) on Windows 10 | Microsoft Docs
• Go to powershell (run as administrator) and run: wsl --set-version Ubuntu-18.04 2 or wsl --set-version Ubuntu 2, whichever distro shows up in wsl -l -v
• Conversion takes time, a few minutes
• Run wsl -l -v to make sure that Ubuntu is running on WSL 2

Now you can run Ubuntu-18.04 or Windows Terminal with Ubuntu and start installing the dependencies and tools

Note: If you are running into an error installing one of the gems during bundle install: Make sure you are on Ubuntu-18.04 and not 20.04

However, if you already have postgreSQL 12 and running on port 5432, you might run into some issues, since the dependencies install postgreSQL 10, which might increment the port to 5433.
To fix that:

• Open your folder in a text editor (VS Code for example)
• Go to config/database.yml
• Under development and under adapter, add a new line and then add: port: 5433
• Make sure you do the same for test and profile.

If the above doesn’t work, make sure to check if PostgreSQL is running and at which port via pg_isready. Then follow the same instructions above, setting the port equal to the one the database is running on.

FOR THE LINUX KERNEL: Updating the WSL 2 Linux kernel | Microsoft Docs

@RickyC0626

A solution that does not require explicit port configuration in database.yml

Some errors during database creation and migration:

Invalid Redis connection to a specific port / connection refusal

bundle exec rake db:create

rake aborted!
Redis::CannotConnectError: Error connecting to Redis on localhost:6379 (Errno::ECONNREFUSED)
...

Caused by:
Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:6379
...

Caused by:
IO::EINPROGRESSWaitWritable: Operation now in progress - connect(2) would block
...

Tasks: TOP => db:create => db:load_config => environment
(See full trace by running task with --trace)

From this error we can see that the port Redis uses is 6379, and we can fix this by starting the Redis server via that port.

By default, redis-server --daemonize yes should work, but if not, use:

redis-server --daemonize yes --port 6379

Check status of Redis instance:

redis-cli

127.0.0.1:6379> ping
PONG

Invalid connection to psql port

bundle exec rake db:migrate

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"?

From this error we can see that PostgreSQL is having trouble connecting to port 5432. Usually starting the service should work

sudo service postgresql start

If this still doesn’t work and the error persists, try checking to see which port the service is listening from, and if necessary, change the port to the one you want in postgresql.conf:

pg_isready

/var/run/postgresql:5432 - no response
or
/var/run/postgresql:5432 - accepting connections

---

The Result

Once we have done the above or executed the start-discourse command, the two instances should run on their default/specified ports. To check their status via the default Windows cmd terminal, we can run:

netstat -anop tcp

which will show something like this:

Proto    Local Address        Foreign Address        State            PID
TCP      127.0.0.1:5432       0.0.0.0:0              LISTENING        17768
TCP      127.0.0.1:6379       0.0.0.0:0              LISTENING        17768

We have now confirmed that both our postgresql and redis-server instances are running.

We can also check the status of the instances on Ubuntu or WSL, with the following commands:

lsof -i

COMMAND     PID        USER  FD  TYPE  DEVICE  SIZE/OFF  NODE  NAME
mailcatch  3244  rickyc0626  7u  IPv4   36127       0t0   TCP  localhost:1025 (LISTEN)
mailcatch  3244  rickyc0626  8u  IPv4   36128       0t0   TCP  *:socks (LISTEN)
redis-ser  3287  rickyc0626  6u  IPv6   29352       0t0   TCP  *:6379 (LISTEN)
redis-ser  3287  rickyc0626  7u  IPv6   29353       0t0   TCP  *:6379 (LISTEN)

---

sudo ss -plunt | grep postgres

tcp  LISTEN  0  128  127.0.0.1:5432  0.0.0.0:*  users:(("postgres",pid=3070,fd=7))

---

pg_lsclusters

Ver Cluster Port Status Owner    Data directory              Log file
10  main    5432 online postgres /var/lib/postgresql/10/main /var/log/postgresql/postgresql-10-main.log

---

From here, these commands should work with no major issues, without needing to modify the database.yml file:

bundle exec rake db:create
bundle exec rake db:migrate
RAILS_ENV=test bundle exec rake db:create db:migrate

Any further issues that show up can be addressed in the future.

As of July 1, 2020

@RickyC0626

A solution that does not require explicit port configuration in database.yml

Some errors during database creation and migration:

Invalid Redis connection to a specific port / connection refusal

bundle exec rake db:create

rake aborted!
Redis::CannotConnectError: Error connecting to Redis on localhost:6379 (Errno::ECONNREFUSED)
...

Caused by:
Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:6379
...

Caused by:
IO::EINPROGRESSWaitWritable: Operation now in progress - connect(2) would block
...

Tasks: TOP => db:create => db:load_config => environment
(See full trace by running task with --trace)

From this error we can see that the port Redis uses is 6379, and we can fix this by starting the Redis server via that port.

By default, redis-server --daemonize yes should work, but if not, use:

redis-server --daemonize yes --port 6379

Check status of Redis instance:

redis-cli

127.0.0.1:6379> ping
PONG

Invalid connection to psql port

bundle exec rake db:migrate

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"?

From this error we can see that PostgreSQL is having trouble connecting to port 5432. Usually starting the service should work

sudo service postgresql start

If this still doesn’t work and the error persists, try checking to see which port the service is listening from, and if necessary, change the port to the one you want in postgresql.conf:

pg_isready

/var/run/postgresql:5432 - no response
or
/var/run/postgresql:5432 - accepting connections

---

The Result

Once we have done the above or executed the start-discourse command, the two instances should run on their default/specified ports. To check their status via the default Windows cmd terminal, we can run:

netstat -anop tcp

which will show something like this:

Proto    Local Address        Foreign Address        State            PID
TCP      127.0.0.1:5432       0.0.0.0:0              LISTENING        17768
TCP      127.0.0.1:6379       0.0.0.0:0              LISTENING        17768

We have now confirmed that both our postgresql and redis-server instances are running.

We can also check the status of the instances on Ubuntu or WSL, with the following commands:

lsof -i

COMMAND     PID        USER  FD  TYPE  DEVICE  SIZE/OFF  NODE  NAME
mailcatch  3244  rickyc0626  7u  IPv4   36127       0t0   TCP  localhost:1025 (LISTEN)
mailcatch  3244  rickyc0626  8u  IPv4   36128       0t0   TCP  *:socks (LISTEN)
redis-ser  3287  rickyc0626  6u  IPv6   29352       0t0   TCP  *:6379 (LISTEN)
redis-ser  3287  rickyc0626  7u  IPv6   29353       0t0   TCP  *:6379 (LISTEN)

---

sudo ss -plunt | grep postgres

tcp  LISTEN  0  128  127.0.0.1:5432  0.0.0.0:*  users:(("postgres",pid=3070,fd=7))

---

pg_lsclusters

Ver Cluster Port Status Owner    Data directory              Log file
10  main    5432 online postgres /var/lib/postgresql/10/main /var/log/postgresql/postgresql-10-main.log

---

From here, these commands should work with no major issues, without needing to modify the database.yml file:

bundle exec rake db:create
bundle exec rake db:migrate
RAILS_ENV=test bundle exec rake db:create db:migrate

Any further issues that show up can be addressed in the future.

---

Last Reviewed by @SaraDev on 2022-06-16T02:00:00Z

---

This document is version controlled - suggest changes on github.

[Arkshine]

@Arkshine

在全新的 Ubuntu 22（Windows 10, WSL2）和成功的 Discourse 安装上，所有图片在默认端口 4200 上都无法提供服务。

好了，找到了一个解决方案。

我注意到将 127.0.0.1 替换为 localhost 可以解决图片问题。

搜索了一下，你可以使用以下命令来启动 Discourse：

DISCOURSE_HOSTNAME=localhost UNICORN_LISTENER=localhost:3000 bin/ember-cli -u

---

我稍后会尝试更新指南。

[Arkshine]

能帮忙看看这个 PR 吗？

FIX: The PostgreSQL service not starting after installation (WSL2 context)

这样能让这个指南更友好一些。

[Will_S1 (Will S)]

在运行 bundle install 后，为什么会出现“抱歉，发生意外错误，Bundler 无法继续。”的提示？

[D111 (D)]

同样的问题

[sam (Sam Saffron)]

你能提供错误的截图吗？你安装的是什么版本的 Ruby？

[frocm]

我遇到了依赖项问题：

ux430uq@Asus-UX430UQ:~/discourse$ bundle install
You must use Bundler 2 or greater with this lockfile.
ux430uq@Asus-UX430UQ:~/discourse$ bundler -v
Bundler version 1.16.1

ux430uq@Asus-UX430UQ:~/discourse$ gem install bundler

Fetching: bundler-2.4.20.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /var/lib/gems/2.5.0 directory.
ux430uq@Asus-UX430UQ:~/discourse$
ux430uq@Asus-UX430UQ:~/discourse$ sudo gem install bundler
[sudo] password for ux430uq:
Fetching: bundler-2.4.20.gem (100%)
ERROR:  Error installing bundler:
        The last version of bundler (>= 0) to support your Ruby & RubyGems was 2.3.26. Try installing it with `gem install bundler -v 2.3.26`
        bundler requires Ruby version >= 2.6.0. The current ruby version is 2.5.0.
ux430uq@Asus-UX430UQ:~/discourse$ bundler -v
Bundler version 1.16.1
ux430uq@Asus-UX430UQ:~/discourse$

有什么简单的方法可以解决这个问题吗？我曾尝试安装 2.6.0，然后是 2.7.0，但总是遇到其他问题。

[AliBenBongo]

正如前面的一些评论所述，我在尝试遵循本指南时也遇到了一些困难和错误——在 Windows 10 和 Windows 11 桌面都进行了尝试。

经过一些反复试验，我终于找到了在 Windows 11 下成功搭建开发环境的步骤，并在最新的 22H2 版本和即将发布的 23H2 Release Preview 版本上进行了测试（我假设它也能在最新版本的 Windows 10 上运行）。

如果对大家有帮助，我刚刚在这里发布了指南：-

Guide to Setting Up Discourse Development Environment - Windows 11

Hi Everyone, After spending some time attempting to get a working development environment up and running under Windows 11 / WSL2 I thought I would share the steps that I have followed. This is my first post here so I hope that this is of use to somebody I am a Systems Administrator used to working with Windows so this has been an interesting journey learning Linux / Ruby / Discourse etc. A few things seem to have changed since the guide for Windows 10 was written and I ran into…

希望这能帮助到像我一样试图在 Windows 上运行 Discourse 的人们

[Canapin (Coin-coin le Canapin)]

我再次通读了整个官方指南，以确保在我上次尝试后没有任何东西损坏。
我在 Windows 11 上通过 WSL 安装了 Ubuntu（未指定版本），它安装了最新的 LTS 版本，即 22.04。

我没有遇到任何问题；一切都很顺利，没有错误，开发环境安装成功。

如果您将来在按照我们的官方指南安装某项内容时遇到麻烦，请记下错误并向我们报告，这总是有用的

---

不过有两个警告：

安装 Node.js 时：

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                           脚本弃用警告


  此脚本位于 https://deb.nodesource.com/setup_X，用于
  安装 Node.js 已弃用，并将最终失效。

  请访问 NodeSource distributions GitHub 并按照
  说明迁移您的仓库。
  https://github.com/nodesource/distributions

  NodeSource Node.js Linux distributions GitHub 存储库包含
  有关支持的 Node.js 版本和 Linux 发行版的信息
  以及如何安装。
  https://github.com/nodesource/distributions


                          脚本弃用警告

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================================================================================

为避免此等待，请迁移脚本
将在 60 秒后继续（按 Ctrl-C 中止）...

运行 redis-server --daemonize yes 时：

# 警告：必须启用内存超额提交！否则，在内存不足的情况下，后台保存或复制可能会失败。禁用它也可能在内存未不足的情况下导致失败，请参阅 https://github.com/jemalloc/jemalloc/issues/1328。要解决此问题，请将 'vm.overcommit_memory = 1' 添加到 /etc/sysctl.conf，然后重新启动或运行命令 'sysctl vm.overcommit_memory=1' 使其生效。

[AliBenBongo]

我不确定当时我遇到这么多问题的原因！也许是我的 Windows 安装有问题，我在故障排除过程中无意中修复了它！

不过，我仍然对到目前为止所学到的东西感到满意，并期待继续努力将我的论坛迁移到 Discourse。

[Arkshine]

@Canapin

我再次通读了整个官方指南，以确保自上次尝试以来没有任何东西损坏。

我不得不重装了 Windows，现在我安装了一个全新的 Windows 11。
我将遵循指南，稍后汇报！我也会记住 @AliBenBongo 的指南。

[Arkshine]

这是一个后续跟进。

该指南肯定需要更新，但在全新的 Windows 11 22H2 上仍然运行得非常好。

我遇到的唯一问题是，尽管 wsl 命令在终端中可用，但 WSL 功能实际上并未默认启用：

[NateDhaliwal]

我认为本指南已过时。Ubuntu/Debian 指南中提到的步骤已不存在。

[NateDhaliwal]

有什么方法可以撤销所有这些步骤，例如撤销软件包、gem 的安装脚本和克隆吗？

[TempAccount]

@Discourse

警告： 请安装 Ubuntu 18.04，而不是 20.04，因为某些安装在 20.04 上会失败。

安装 18.04 覆盖 20.04 是否仍然是必需的？

安装 nodejs 时收到错误：

# apt install nodejs

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 nodejs : Depends: libc6 (>= 2.28) but 2.27-3ubuntu1.6 is to be installed
E: Unable to correct problems, you have held broken packages.```