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diff --git a/docs/Running-behind-apache.md b/docs/Running-behind-apache.md index 6c5ab677..8810dc8f 100644 --- a/docs/Running-behind-apache.md +++ b/docs/Running-behind-apache.md @@ -1,3 +1,8 @@ +<!-- +title: "Netdata via apache's mod_proxy" +custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/Running-behind-apache.md +--> + # Netdata via apache's mod_proxy Below you can find instructions for configuring an apache server to: @@ -14,7 +19,7 @@ Make sure your apache has installed `mod_proxy` and `mod_proxy_http`. On debian/ubuntu systems, install them with this: ```sh -sudo apt-get install apache2-bin +sudo apt-get install apache2 ``` Also make sure they are enabled: @@ -227,6 +232,52 @@ If you want to enable CSP within your Apache, you should consider some special r Note: Changes are applied by reloading or restarting Apache. +## Using Netdata with Apache's `mod_evasive` module + +The `mod_evasive` Apache module helps system administrators protect their web server from brute force and distributed +denial of service attack (DDoS) attacks. + +Because Netdata sends a request to the web server for every chart update, it's normal to create 20-30 requests per +second, per client. If you're using `mod_evasive` on your Apache web server, this volume of requests will trigger the +module's protection, and your dashboard will become unresponsive. You may even begin to see 403 errors. + +To mitigate this issue, you will need to change the value of the `DOSPageCount` option in your `mod_evasive.conf` file, +which can typically be found at `/etc/httpd/conf.d/mod_evasive.conf` or `/etc/apache2/mods-enabled/evasive.conf`. + +The `DOSPageCount` option sets the limit of the number of requests from a single IP address for the same page per page +interval, which is usually 1 second. The default value is `2` requests per second. Clearly, Netdata's typical usage will +exceed that threshold, and `mod_evasive` will add your IP address to a blocklist. + +Our users have found success by setting `DOSPageCount` to `30`. Try this, and raise the value if you continue to see 403 +errors while accessing the dashboard. + +```conf +DOSPageCount 30 +``` + +Restart Apache with `sudo service apache2 restart`, or the appropriate method to restart services on your system, to +reload its configuration with your new values. + + +### Virtual host + +To adjust the `DOSPageCount` for a specific virtual host, open your virtual host config, which can be found at +`/etc/httpd/conf/sites-available/my-domain.conf` or `/etc/apache2/sites-available/my-domain.conf` and add the +following: + +```conf +<VirtualHost *:80> + ... + # Increase the DOSPageCount to prevent 403 errors and IP addresses being blocked. + <IfModule mod_evasive20.c> + DOSPageCount 30 + </IfModule> +</VirtualHost> +``` + +See issues [#2011](https://github.com/netdata/netdata/issues/2011) and +[#7658](https://github.com/netdata/netdata/issues/7568) for more information. + # Netdata configuration You might edit `/etc/netdata/netdata.conf` to optimize your setup a bit. For applying these changes you need to restart Netdata. @@ -301,7 +352,7 @@ If your apache server is not on localhost, you can set: *note: Netdata v1.9+ support `allow connections from`* -`allow connections from` accepts [Netdata simple patterns](../libnetdata/simple_pattern/) to match against the connection IP address. +`allow connections from` accepts [Netdata simple patterns](/libnetdata/simple_pattern/README.md) to match against the connection IP address. ## prevent the double access.log @@ -314,7 +365,7 @@ apache logs accesses and Netdata logs them too. You can prevent Netdata from gen ## Troubleshooting mod_proxy -Make sure the requests reach Netdata, by examing `/var/log/netdata/access.log`. +Make sure the requests reach Netdata, by examining `/var/log/netdata/access.log`. 1. if the requests do not reach Netdata, your apache does not forward them. 2. if the requests reach Netdata but the URLs are wrong, you have not re-written them properly. |