Though it is more convenient and safer to deploy Discourse following the official install guide, I want to dive deeper into the container and see how it can be deployed in Linux without Docker. I want to share the steps just for your information. You adapt it and use it at your own risk.
Dive into how Discourse is run in container
I take a look at the output of ./launcher start-cmd webonly:
true run --shm-size=512m --link data:data -d --restart=always -e LANG=en_US.UTF-8 -e RAILS_ENV=production … --name webonly -t -v /var/discourse/shared/webonly:/shared … local_discourse/webonly /sbin/boot
then look at /sbin/boot and /etc/service/unicorn/run, I get the core cmd to start Discourse:
LD_PRELOAD=$RUBY_ALLOCATOR HOME=/home/discourse USER=discourse exec thpoff chpst -u discourse:www-data -U discourse:www-data bundle exec config/unicorn_launcher -E production -c config/unicorn.conf.rb
prepare system
FYI, I use Ubuntu 24.04 and zsh.
Follow PG’s offical installation guide to install postgres from PostgreSQL Apt Repository. I installed the version 18, which works quite well, though the offical install uses 15 at time of writing.
Install redis(8.2 at time of writing, official install uses 7.0), nginx and create dedicated user discourse:
apt install nginx libnginx-mod-http-brotli-static redis zsh zsh-autosuggestions zsh-syntax-highlighting
systemctl enable --now postgresql redis nginx
useradd -m -s /bin/zsh discourse
Install ImageMagick 7 (I use IMEI) and check the version. Mine is:
magick --version
Version: ImageMagick 7.1.2-3 Q16-HDRI
then, change user(su - discourse) and install pnpm, rvm.
curl -fsSL https://get.pnpm.io/install.sh | zsh -
curl -sSL https://get.rvm.io | bash
then adapt and add the following config to your .zshrc
/home/discourse/.zshrc
# pnpm
export PNPM_HOME="/home/discourse/.local/share/pnpm"
case ":$PATH:" in
*":$PNPM_HOME:"*) ;;
*) export PATH="$PNPM_HOME:$PATH" ;;
esac
# pnpm end
alias npm='pnpm'
alias npx='pnpx'
# Add RVM to PATH for scripting. Make sure this is the last PATH variable change.
export PATH="$PATH:$HOME/.rvm/bin"
export ALLOW_EMBER_CLI_PROXY_BYPASS=1
export RAILS_ENV=production
export UNICORN_SIDEKIQ_MAX_RSS=1000
export UNICORN_WORKERS=4
export UNICORN_SIDEKIQS=1
export PUMA_SIDEKIQ_MAX_RSS=1000
export PUMA_WORKERS=4
export PUMA_SIDEKIQS=1
#export RUBY_YJIT_ENABLE=1
#export RUBY_CONFIGURE_OPTS="--enable-yjit"
export DISCOURSE_HOSTNAME=example.com
export DISCOURSE_DEVELOPER_EMAILS=discourse-admin@example.com
export DISCOURSE_MAXMIND_ACCOUNT_ID=<id>
export DISCOURSE_MAXMIND_LICENSE_KEY=<key>
export DISCOURSE_ENABLE_CORS=true
export DISCOURSE_MAX_REQS_PER_IP_MODE=none
export DISCOURSE_MAX_REQS_PER_IP_PER_MINUTE=20000
export DISCOURSE_MAX_REQS_PER_IP_PER_10_SECONDS=5000
export DISCOURSE_MAX_ASSET_REQS_PER_IP_PER_10_SECONDS=20000
export DISCOURSE_MAX_REQS_RATE_LIMIT_ON_PRIVATE=false
export DISCOURSE_MAX_USER_API_REQS_PER_MINUTE=200
export DISCOURSE_MAX_USER_API_REQS_PER_DAY=28800
export DISCOURSE_MAX_ADMIN_API_REQS_PER_MINUTE=600
export DISCOURSE_MAX_DATA_EXPLORER_API_REQ_MODE=none
export DISCOURSE_MAX_REQS_PER_IP_EXCEPTIONS="127.0.0.1 ::1"
cd /var/www/discourse
logout and login again as discourse for .zshrc to take effect.
Install node and ruby:
pnpm env use --global latest # will install node 24.9 at time of writing. offical install uses 22
rvm get master
rvm install 3.4 # will install ruby 3.4.6 at time of writing. official install uses 3.3
rvm use 3.4 --default
prepare db (and restore a backup)
sudo -u postgres createuser -s discourse
sudo -u postgres createdb discourse
$sudo -u postgres psql discourse
psql>
ALTER USER discourse WITH PASSWORD 'xxx';
CREATE EXTENSION hstore;CREATE EXTENSION pg_trgm;
CREATE EXTENSION plpgsql;
CREATE EXTENSION unaccent;
CREATE EXTENSION vector;
# to restore database extracted from a backup:
$ gunzip < dump.sql.gz | psql discourse
To restore backup, you also need to copy the public and plugins folder as well.
install Discourse
as user root:
cd /var/www/
git clone https://github.com/discourse/discourse
mkdir -p /var/www/discourse/public
chown -R discourse:discourse /var/www/discourse/
chown -R discourse:www-data /var/www/discourse/public
configure config/discourse.conf:
config/discourse.conf
max_data_explorer_api_req_mode = 'none'
max_user_api_reqs_per_day = '28800'
hostname = '127.0.0.1'
hostname = 'example.com'
redis_host = '127.0.0.1'
db_password = '<password>'
db_socket = ''
max_reqs_per_ip_per_10_seconds = '5000'
max_asset_reqs_per_ip_per_10_seconds = '20000'
max_reqs_rate_limit_on_private = 'false'
developer_emails = 'discourse-admin@example.com'
max_user_api_reqs_per_minute = '200'
maxmind_license_key = '<key>'
maxmind_account_id = '<id>'
max_reqs_per_ip_per_minute = '20000'
db_host = '127.0.0.1'
enable_cors = 'true'
db_port = ''
max_reqs_per_ip_mode = 'none'
max_admin_api_reqs_per_minute = '600'
smtp_user_name = '<name>'
smtp_address = 'postal.example.com'
smtp_port = '25'
smtp_password = '<password>'
smtp_domain = 'postalsend.example.com'
notification_email = 'noreply@postalsend.example.com'
Do the bundle / pnpm install, db migration, assets precompile stuff. This is also how you upgrade discourse and plugins.
as user discourse:
cd /var/www/discourse
git stash
git pull
git checkout tests-passed
cd plugins
for plugin in *
do
echo $plugin; cd ${plugin}; git pull; cd ..
done
cd ../
sed -i '/gem "rails_multisite"/i gem "rails"' Gemfile
bundle install --jobs $(($(nproc) - 1))
pnpm i
bundle exec rake db:migrate
bundle exec rake themes:update
bundle exec rake assets:precompile
I don’t want to use unicorn. Heroku recommends using the Puma web server instead of Unicorn. Here is my config/puma.rb written after consulting config/unicorn.conf.rb:
config/puma.rb
# frozen_string_literal: true
require "fileutils"
#require 'puma/acme'
discourse_path = File.expand_path(File.expand_path(File.dirname(__FILE__)) + "/../")
enable_logstash_logger = ENV["ENABLE_LOGSTASH_LOGGER"] == "1"
puma_stderr_path = "#{discourse_path}/log/puma.stderr.log"
puma_stdout_path = "#{discourse_path}/log/puma.stdout.log"
# Load logstash logger if enabled
if enable_logstash_logger
require_relative "../lib/discourse_logstash_logger"
FileUtils.touch(puma_stderr_path) if !File.exist?(puma_stderr_path)
# Note: You may need to adapt the logger initialization for Puma
log_formatter =
proc do |severity, time, progname, msg|
event = {
"@timestamp" => Time.now.utc,
"message" => msg,
"severity" => severity,
"type" => "puma",
}
"#{event.to_json}\n"
end
else
stdout_redirect puma_stdout_path, puma_stderr_path, true
end
# Number of workers (processes)
workers ENV.fetch("PUMA_WORKERS", 6).to_i
# Set the directory
directory discourse_path
# Bind to the specified address and port
bind ENV.fetch(
"PUMA_BIND",
"tcp://#{ENV["PUMA_BIND_ALL"] ? "" : "127.0.0.1:"}#{ENV.fetch("PUMA_PORT", 3000)}",
)
#bind 'tcp://0.0.0.0:80'
#plugin :acme
#acme_server_name 'example.com'
#acme_tos_agreed true
#bind 'acme://0.0.0.0:443'
# PID file location
FileUtils.mkdir_p("#{discourse_path}/tmp/pids")
pidfile ENV.fetch("PUMA_PID_PATH", "#{discourse_path}/tmp/pids/puma.pid")
# State file - used by pumactl
state_path "#{discourse_path}/tmp/pids/puma.state"
# Environment-specific configuration
if ENV["RAILS_ENV"] == "production"
# Production timeout
worker_timeout 30
else
# Development timeout
worker_timeout ENV.fetch("PUMA_TIMEOUT", 60).to_i
end
# Preload application
preload_app!
# Handle worker boot and shutdown
before_fork do
Discourse.preload_rails!
Discourse.before_fork
# Supervisor check
supervisor_pid = ENV["PUMA_SUPERVISOR_PID"].to_i
if supervisor_pid > 0
Thread.new do
loop do
unless File.exist?("/proc/#{supervisor_pid}")
puts "Kill self supervisor is gone"
Process.kill "TERM", Process.pid
end
sleep 2
end
end
end
# Sidekiq workers
sidekiqs = ENV["PUMA_SIDEKIQS"].to_i
if sidekiqs > 0
puts "starting #{sidekiqs} supervised sidekiqs"
require "demon/sidekiq"
Demon::Sidekiq.after_fork { DiscourseEvent.trigger(:sidekiq_fork_started) }
Demon::Sidekiq.start(sidekiqs)
if Discourse.enable_sidekiq_logging?
Signal.trap("USR1") do
# Delay Sidekiq log reopening
sleep 1
Demon::Sidekiq.kill("USR2")
end
end
end
# Email sync demon
if ENV["DISCOURSE_ENABLE_EMAIL_SYNC_DEMON"] == "true"
puts "starting up EmailSync demon"
Demon::EmailSync.start(1)
end
# Plugin demons
DiscoursePluginRegistry.demon_processes.each do |demon_class|
puts "starting #{demon_class.prefix} demon"
demon_class.start(1)
end
# Demon monitoring thread
Thread.new do
loop do
begin
sleep 60
if sidekiqs > 0
Demon::Sidekiq.ensure_running
Demon::Sidekiq.heartbeat_check
Demon::Sidekiq.rss_memory_check
end
if ENV["DISCOURSE_ENABLE_EMAIL_SYNC_DEMON"] == "true"
Demon::EmailSync.ensure_running
Demon::EmailSync.check_email_sync_heartbeat
end
DiscoursePluginRegistry.demon_processes.each(&:ensure_running)
rescue => e
Rails.logger.warn(
"Error in demon processes heartbeat check: #{e}\n#{e.backtrace.join("\n")}",
)
end
end
end
# Close Redis connection
Discourse.redis.close
end
on_worker_boot do
DiscourseEvent.trigger(:web_fork_started)
Discourse.after_fork
end
# Worker timeout handling
worker_timeout 30
# Low-level worker options
threads 8, 32
To run Discourse, run puma -C config/puma.rb
Using systemd, you can run it on boot and restart it on failure. Here is the service file:
/etc/systemd/system/discourse.service
[Unit]
Description=Discourse with Puma Server
After=network.target postgresql.service
Requires=postgresql.service
[Service]
Type=simple
User=discourse
Group=discourse
WorkingDirectory=/var/www/discourse
# requires running `rvm 3.4.6 --default` before this service is run
ExecStart=/usr/bin/zsh -lc 'source /home/discourse/.zshrc && /home/discourse/.rvm/gems/ruby-3.4.6/bin/puma -C config/puma.rb'
ExecReload=/usr/bin/zsh -lc 'source /home/discourse/.zshrc && /home/discourse/.rvm/gems/ruby-3.4.6/bin/pumactl restart'
# Restart configuration
Restart=always
RestartSec=5s
# Basic security measures
NoNewPrivileges=true
ProtectSystem=full
ProtectHome=read-only
[Install]
WantedBy=multi-user.target
Now the puma server listens on 127.0.0.1:3000. Adapt the nginx config file from Docker:
/etc/nginx/sites-enabled/discourse.conf
# Additional MIME types that you'd like nginx to handle go in here
types {
text/csv csv;
#application/wasm wasm;
}
upstream discourse { server 127.0.0.1:3000; }
# inactive means we keep stuff around for 1440m minutes regardless of last access (1 week)
# levels means it is a 2 deep hierarchy cause we can have lots of files
# max_size limits the size of the cache
proxy_cache_path /var/nginx/cache inactive=1440m levels=1:2 keys_zone=one:10m max_size=600m;
# Increased from the default value to acommodate large cookies during oAuth2 flows
# like in https://meta.discourse.org/t/x/74060 and large CSP and Link (preload) headers
proxy_buffer_size 32k;
proxy_buffers 4 32k;
# Increased from the default value to allow for a large volume of cookies in request headers
# Discourse itself tries to minimise cookie size, but we cannot control other cookies set by other tools on the same domain.
large_client_header_buffers 4 32k;
# attempt to preserve the proto, must be in http context
map $http_x_forwarded_proto $thescheme {
default $scheme;
"~https$" https;
}
log_format log_discourse '[$time_local] "$http_host" $remote_addr "$request" "$http_user_agent" "$sent_http_x_discourse_route" $status $bytes_sent "$http_referer" $upstream_response_time $request_time "$upstream_http_x_discourse_username" "$upstream_http_x_discourse_trackview" "$upstream_http_x_queue_time" "$upstream_http_x_redis_calls" "$upstream_http_x_redis_time" "$upstream_http_x_sql_calls" "$upstream_http_x_sql_time"';
# Allow bypass cache from localhost
#geo $bypass_cache {
# default 0;
# 127.0.0.1 1;
# ::1 1;
#}
limit_req_zone $binary_remote_addr zone=flood:10m rate=12r/s;
limit_req_zone $binary_remote_addr zone=bot:10m rate=200r/m;
limit_req_status 429;
limit_conn_zone $binary_remote_addr zone=connperip:10m;
limit_conn_status 429;
server {
access_log /var/log/nginx/access.log log_discourse;
#listen unix:/var/nginx/nginx.http.sock;
listen 443 ssl;
listen [::]:443 ssl;
server_name example.com;
ssl_certificate /etc/nginx/ssl/example.com.cer;
ssl_certificate_key /etc/nginx/ssl/example.com.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers HIGH:!aNULL:!MD5;
set_real_ip_from unix:;
set_real_ip_from 127.0.0.1/32;
set_real_ip_from ::1/128;
real_ip_header X-Forwarded-For;
real_ip_recursive on;
gzip on;
gzip_vary on;
gzip_min_length 1000;
gzip_comp_level 5;
gzip_types application/json text/css text/javascript application/x-javascript application/javascript image/svg+xml application/wasm;
gzip_proxied any;
# Uncomment and configure this section for HTTPS support
# NOTE: Put your ssl cert in your main nginx config directory (/etc/nginx)
#
# rewrite ^/(.*) https://enter.your.web.hostname.here/$1 permanent;
#
# listen 443 ssl;
# ssl_certificate your-hostname-cert.pem;
# ssl_certificate_key your-hostname-cert.key;
# ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
# ssl_ciphers HIGH:!aNULL:!MD5;
#
server_tokens off;
sendfile on;
keepalive_timeout 65;
# maximum file upload size (keep up to date when changing the corresponding site setting)
client_max_body_size 128m ;
# path to discourse's public directory
set $public /var/www/discourse/public;
# without weak etags we get zero benefit from etags on dynamically compressed content
# further more etags are based on the file in nginx not sha of data
# use dates, it solves the problem fine even cross server
etag off;
# prevent direct download of backups
location ^~ /backups/ {
internal;
}
# bypass rails stack with a cheap 204 for favicon.ico requests
location /favicon.ico {
return 204;
access_log off;
log_not_found off;
}
location / {
root $public;
add_header ETag "";
# auth_basic on;
# auth_basic_user_file /etc/nginx/htpasswd;
location ~ ^/uploads/short-url/ {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
break;
}
location ~ ^/(secure-media-uploads/|secure-uploads)/ {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
break;
}
location ~* (fonts|assets|plugins|uploads)/.*\.(eot|ttf|woff|woff2|ico|otf)$ {
expires 1y;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
location = /srv/status {
access_log off;
log_not_found off;
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
break;
}
# some minimal caching here so we don't keep asking
# longer term we should increase probably to 1y
location ~ ^/javascripts/ {
expires 1d;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
location ~ ^/assets/(?<asset_path>.+)$ {
expires 1y;
# asset pipeline enables this
brotli_static on;
gzip_static on;
add_header Cache-Control public,immutable;
# HOOK in asset location (used for extensibility)
# TODO I don't think this break is needed, it just breaks out of rewrite
break;
}
location ~ ^/plugins/ {
expires 1y;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
# cache emojis
location ~ /images/emoji/ {
expires 1y;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
location ~ ^/uploads/ {
# NOTE: it is really annoying that we can't just define headers
# at the top level and inherit.
#
# proxy_set_header DOES NOT inherit, by design, we must repeat it,
# otherwise headers are not set correctly
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_set_header X-Sendfile-Type X-Accel-Redirect;
proxy_set_header X-Accel-Mapping $public/=/downloads/;
expires 1y;
add_header Cache-Control public,immutable;
## optional upload anti-hotlinking rules
#valid_referers none blocked mysite.com *.mysite.com;
#if ($invalid_referer) { return 403; }
# custom CSS
location ~ /stylesheet-cache/ {
add_header Access-Control-Allow-Origin *;
try_files $uri =404;
}
# this allows us to bypass rails
location ~* \.(gif|png|jpg|jpeg|bmp|tif|tiff|ico|webp|avif)$ {
add_header Access-Control-Allow-Origin *;
try_files $uri =404;
}
# SVG needs an extra header attached
location ~* \.(svg)$ {
}
# thumbnails & optimized images
location ~ /_?optimized/ {
add_header Access-Control-Allow-Origin *;
try_files $uri =404;
}
proxy_pass http://discourse;
break;
}
location ~ ^/admin/backups/ {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_set_header X-Sendfile-Type X-Accel-Redirect;
proxy_set_header X-Accel-Mapping $public/=/downloads/;
proxy_pass http://discourse;
break;
}
# This big block is needed so we can selectively enable
# acceleration for backups, avatars, sprites and so on.
# see note about repetition above
location ~ ^/(svg-sprite/|letter_avatar/|letter_avatar_proxy/|user_avatar|highlight-js|stylesheets|theme-javascripts|favicon/proxied|service-worker) {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
# if Set-Cookie is in the response nothing gets cached
# this is double bad cause we are not passing last modified in
proxy_ignore_headers "Set-Cookie";
proxy_hide_header "Set-Cookie";
proxy_hide_header "X-Discourse-Username";
proxy_hide_header "X-Runtime";
# note x-accel-redirect can not be used with proxy_cache
proxy_cache one;
proxy_cache_key "$scheme,$host,$request_uri";
proxy_cache_valid 200 301 302 7d;
#proxy_cache_bypass $bypass_cache;
proxy_pass http://discourse;
break;
}
# we need buffering off for message bus
location /message-bus/ {
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_http_version 1.1;
proxy_buffering off;
proxy_pass http://discourse;
break;
}
# this means every file in public is tried first
try_files $uri @discourse;
}
location /downloads/ {
internal;
alias $public/;
}
location @discourse {
limit_conn connperip 20;
limit_req zone=flood burst=12 nodelay;
limit_req zone=bot burst=100 nodelay;
proxy_set_header Host $http_host;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
}
}
Now your Discourse can be accessed from example.com:443.
maintenance
To access rails console, simply run rails c as user discourse in /var/www/discourse. The discourse cmd which can be found in official doc is basically bundle exec script/discourse.
To upgrade Discourse, consult #upgrade-cmd, then restart puma using either puma restart or puma phased-restart. For the difference, consult puma/docs/restart.md at master · puma/puma · GitHub .
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