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Docs for "tuning for scale"

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Philipp Heckel 2021-12-06 16:43:06 -05:00
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4
Makefile
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@ -118,12 +118,12 @@ clean: .PHONY
release-check-tags:
$(eval LATEST_TAG := $(shell git describe --abbrev=0 --tags | cut -c2-))
if grep -q $(LATEST_TAG) docs/install.md; then\
if ! grep -q $(LATEST_TAG) docs/install.md; then\
echo "ERROR: Must update docs/install.md with latest tag first.";\
exit 1;\
fi
release: build-deps
release: build-deps release-check-tags
goreleaser release --rm-dist --debug
release-snapshot: build-deps

1
config/ntfy.service
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@ -5,6 +5,7 @@ After=network.target
[Service]
ExecStart=/usr/bin/ntfy
Restart=on-failure
LimitNOFILE=10000
[Install]
WantedBy=multi-user.target

173
docs/config.md
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@ -34,16 +34,124 @@ Subscribers can retrieve cached messaging using the [`poll=1` parameter](subscri
## Behind a proxy (TLS, etc.)
!!! warning
If you are running ntfy behind a proxy, you must set the `behind-proxy` flag. Otherwise all visitors are rate limited
as if they are one.
If you are running ntfy behind a proxy, you must set the `behind-proxy` flag. Otherwise, all visitors are
[rate limited](#rate-limiting) as if they are one.
**Rate limiting:** If you are running ntfy behind a proxy (e.g. nginx, HAproxy or Apache), you should set the `behind-proxy`
### Rate limiting
If you are running ntfy behind a proxy (e.g. nginx, HAproxy or Apache), you should set the `behind-proxy`
flag. This will instruct the [rate limiting](#rate-limiting) logic to use the `X-Forwarded-For` header as the primary
identifier for a visitor, as opposed to the remote IP address. If the `behind-proxy` flag is not set, all visitors will
be counted as one, because from the perspective of the ntfy server, they all share the proxy's IP address.
**TLS/SSL:** ntfy supports HTTPS/TLS by setting the `listen-https` [config option](#config-options). However, if you
are behind a proxy, it is recommended that TLS/SSL termination is done by the proxy itself.
### TLS/SSL
ntfy supports HTTPS/TLS by setting the `listen-https` [config option](#config-options). However, if you
are behind a proxy, it is recommended that TLS/SSL termination is done by the proxy itself (see below).
### nginx/Apache2 configs
For your convenience, here's a working config that'll help configure things behind a proxy. In this
example, ntfy runs on `:13222` and we proxy traffic to it. We also redirect HTTP to HTTPS for GET requests against a topic
or the root domain:
=== "nginx (/etc/nginx/sites-*/ntfy)"
```
server {
listen 80;
server_name ntfy.sh;
location / {
proxy_pass http://127.0.0.1:13222;
proxy_http_version 1.1;
proxy_buffering off;
proxy_redirect off;
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 $scheme;
proxy_connect_timeout 1m;
proxy_send_timeout 1m;
proxy_read_timeout 1m;
}
}
server {
listen 443 ssl;
server_name ntfy.sh;
ssl_session_cache builtin:1000 shared:SSL:10m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4;
ssl_prefer_server_ciphers on;
ssl_certificate /etc/letsencrypt/live/nopaste.net/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/nopaste.net/privkey.pem;
location / {
proxy_pass http://127.0.0.1:13222;
proxy_http_version 1.1;
proxy_buffering off;
proxy_redirect off;
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 $scheme;
proxy_connect_timeout 1m;
proxy_send_timeout 1m;
proxy_read_timeout 1m;
}
}
```
=== "Apache2 (/etc/apache2/sites-*/ntfy.conf"
```
<VirtualHost *:80>
ServerName ntfy.sh
SetEnv proxy-nokeepalive 1
SetEnv proxy-sendchunked 1
ProxyPass / http://127.0.0.1:13222/
ProxyPassReverse / http://127.0.0.1:13222/
# Higher than the max message size of 512k
LimitRequestBody 102400
# Redirect HTTP to HTTPS, but only for GET topic addresses, since we want
# it to work with curl without the annoying https:// prefix
RewriteEngine on
RewriteCond %{REQUEST_METHOD} GET
RewriteRule ^/([-_A-Za-z0-9]{0,64})$ https://%{SERVER_NAME}/$1 [R,L]
</VirtualHost>
<VirtualHost *:443>
ServerName ntfy.sh
SSLEngine on
SSLCertificateFile /etc/letsencrypt/live/ntfy.sh/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/ntfy.sh/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
SetEnv proxy-nokeepalive 1
SetEnv proxy-sendchunked 1
ProxyPass / http://127.0.0.1:13222/
ProxyPassReverse / http://127.0.0.1:13222/
# Higher than the max message size of 512k
LimitRequestBody 102400
# Redirect HTTP to HTTPS, but only for GET topic addresses, since we want
# it to work with curl without the annoying https:// prefix
RewriteEngine on
RewriteCond %{REQUEST_METHOD} GET
RewriteRule ^/([-_A-Za-z0-9]{0,64})$ https://%{SERVER_NAME}/$1 [R,L]
</VirtualHost>
```
## Firebase (FCM)
!!! info
@ -99,6 +207,61 @@ request every 10s (defined by `visitor-request-limit-replenish`)
During normal usage, you shouldn't encounter this limit at all, and even if you burst a few requests shortly (e.g. when you
reconnect after a connection drop), it shouldn't have any effect.
## Tuning for scale
If you're running ntfy for your home server, you probably don't need to worry about scale at all. In its default config,
if it's not behind a proxy, the ntfy server can keep about **as many connections as the open file limit allows**.
This limit is typically called `nofile`. Other than that, RAM and CPU are obviously relevant. You may also want to check
out [this discussion on Reddit](https://www.reddit.com/r/golang/comments/r9u4ee/how_many_actively_connected_http_clients_can_a_go/).
Depending on *how you run it*, here are a few limits that are relevant:
### For systemd services
If you're running ntfy in a systemd service (e.g. for .deb/.rpm packages), the main limiting factor is the
`LimitNOFILE` setting in the systemd unit. The default open files limit for `ntfy.service` is 10000. You can override it
by creating a `/etc/systemd/system/ntfy.service.d/override.conf` file. As far as I can tell, `/etc/security/limits.conf`
is not relevant.
=== "/etc/systemd/system/ntfy.service.d/override.conf"
```
# Allow 20,000 ntfy connections (and give room for other file handles)
[Service]
LimitNOFILE=20500
```
### Outside of systemd
If you're running outside systemd, you may want to adjust your `/etc/security/limits.conf` file to
increase the `nofile` setting. Here's an example that increases the limit to 5000. You can find out the current setting
by running `ulimit -n`, or manually override it temporarily by running `ulimit -n 50000`.
=== "/etc/security/limits.conf"
```
# Increase open files limit globally
* hard nofile 20500
```
### Proxy limits (nginx, Apache2)
If you are running [behind a proxy](#behind-a-proxy-tls-etc) (e.g. nginx, Apache), the open files limit of the proxy is also
relevant. So if your proxy runs inside of systemd, increase the limits in systemd for the proxy. Typically, the proxy
open files limit has to be **double the number of how many connections you'd like to support**, because the proxy has
to maintain the client connection and the connection to ntfy.
=== "/etc/nginx/nginx.conf"
```
events {
# Allow 20,000 proxy connections (2x of the desired ntfy connection count;
# and give room for other file handles)
worker_connections 40500;
}
```
=== "/etc/systemd/system/nginx.service.d/override.conf"
```
# Allow 40,000 proxy connections (2x of the desired ntfy connection count;
# and give room for other file handles)
[Service]
LimitNOFILE=40500
```
## Config options
Each config option can be set in the config file `/etc/ntfy/config.yml` (e.g. `listen-http: :80`) or as a
CLI option (e.g. `--listen-http :80`. Here's a list of all available options. Alternatively, you can set an environment