1 files changed, 177 insertions, 0 deletions
diff --git a/docs/category-overview-pages/secure-nodes.md b/docs/category-overview-pages/secure-nodes.md
new file mode 100644
index 00000000..33e205f0
--- /dev/null
+++ b/docs/category-overview-pages/secure-nodes.md
@@ -0,0 +1,177 @@
+# Secure your nodes
+
+Netdata is a monitoring system. It should be protected, the same way you protect all your admin apps. We assume Netdata 
+will be installed privately, for your eyes only.
+
+Upon installation, the Netdata Agent serves the **local dashboard** at port `19999`. If the node is accessible to the
+internet at large, anyone can access the dashboard and your node's metrics at `http://NODE:19999`. We made this decision
+so that the local dashboard was immediately accessible to users, and so that we don't dictate how professionals set up
+and secure their infrastructures. 
+
+Viewers will be able to get some information about the system Netdata is running. This information is everything the dashboard 
+provides. The dashboard includes a list of the services each system runs (the legends of the charts under the `Systemd Services` 
+section),  the applications running (the legends of the charts under the `Applications` section), the disks of the system and 
+their names, the user accounts of the system that are running processes (the `Users` and `User Groups` section of the dashboard), 
+the network interfaces and their names (not the IPs) and detailed information about the performance of the system and its applications.
+
+This information is not sensitive (meaning that it is not your business data), but **it is important for possible attackers**. 
+It will give them clues on what to check, what to try and in the case of DDoS against your applications, they will know if they 
+are doing it right or not.
+
+Also, viewers could use Netdata itself to stress your servers. Although the Netdata daemon runs unprivileged, with the minimum 
+process priority (scheduling priority `idle` - lower than nice 19) and adjusts its OutOfMemory (OOM) score to 1000 (so that it 
+will be first to be killed by the kernel if the system starves for memory), some pressure can be applied on your systems if 
+someone attempts a DDoS against Netdata.
+
+Instead of dictating how to secure your infrastructure, we give you many options to establish security best practices
+that align with your goals and your organization's standards.
+
+- [Disable the local dashboard](#disable-the-local-dashboard): **Simplest and recommended method** for those who have
+  added nodes to Netdata Cloud and view dashboards and metrics there.
+
+- [Expose Netdata only in a private LAN](#expose-netdata-only-in-a-private-lan). Simplest and recommended method for those who do not use Netdata Cloud.
+
+- [Fine-grained access control](#fine-grained-access-control): Allow local dashboard access from
+  only certain IP addresses, such as a trusted static IP or connections from behind a management LAN. Full support for Netdata Cloud.
+
+- [Use a reverse proxy (authenticating web server in proxy mode)](#use-an-authenticating-web-server-in-proxy-mode): Password-protect 
+  a local dashboard and enable TLS to secure it. Full support for Netdata Cloud.
+
+- [Use Netdata parents as Web Application Firewalls](#use-netdata-parents-as-web-application-firewalls)
+
+- [Other methods](#other-methods) list some less common methods of protecting Netdata.
+
+## Disable the local dashboard
+
+This is the _recommended method for those who have connected their nodes to Netdata Cloud_ and prefer viewing real-time
+metrics using the War Room Overview, Nodes tab, and Cloud dashboards.
+
+You can disable the local dashboard (and API) but retain the encrypted Agent-Cloud link 
+([ACLK](https://github.com/netdata/netdata/blob/master/aclk/README.md)) that
+allows you to stream metrics on demand from your nodes via the Netdata Cloud interface. This change mitigates all
+concerns about revealing metrics and system design to the internet at large, while keeping all the functionality you
+need to view metrics and troubleshoot issues with Netdata Cloud.
+
+Open `netdata.conf` with `./edit-config netdata.conf`. Scroll down to the `[web]` section, and find the `mode =
+static-threaded` setting, and change it to `none`.
+
+```conf
+[web]
+    mode = none
+```
+
+Save and close the editor, then [restart your Agent](https://github.com/netdata/netdata/blob/master/docs/configure/start-stop-restart.md) 
+using `sudo systemctl
+restart netdata`. If you try to visit the local dashboard to `http://NODE:19999` again, the connection will fail because
+that node no longer serves its local dashboard.
+
+> See the [configuration basics doc](https://github.com/netdata/netdata/blob/master/docs/configure/nodes.md) for details on how to find 
+`netdata.conf` and use
+> `edit-config`.
+
+## Expose Netdata only in a private LAN
+
+If your organisation has a private administration and management LAN, you can bind Netdata on this network interface on all your servers. 
+This is done in `Netdata.conf` with these settings:
+
+```
+[web]
+	bind to = 10.1.1.1:19999 localhost:19999
+```
+
+You can bind Netdata to multiple IPs and ports. If you use hostnames, Netdata will resolve them and use all the IPs 
+(in the above example `localhost` usually resolves to both `127.0.0.1` and `::1`).
+
+**This is the best and the suggested way to protect Netdata**. Your systems **should** have a private administration and management 
+LAN, so that all management tasks are performed without any possibility of them being exposed on the internet.
+
+For cloud based installations, if your cloud provider does not provide such a private LAN (or if you use multiple providers), 
+you can create a virtual management and administration LAN with tools like `tincd` or `gvpe`. These tools create a mesh VPN 
+allowing all servers to communicate securely and privately. Your administration stations join this mesh VPN to get access to 
+management and administration tasks on all your cloud servers.
+
+For `gvpe` we have developed a [simple provisioning tool](https://github.com/netdata/netdata-demo-site/tree/master/gvpe) you 
+may find handy (it includes statically compiled `gvpe` binaries for Linux and FreeBSD, and also a script to compile `gvpe` 
+on your macOS system). We use this to create a management and administration LAN for all Netdata demo sites (spread all over 
+the internet using multiple hosting providers).
+
+## Fine-grained access control
+
+If you want to keep using the local dashboard, but don't want it exposed to the internet, you can restrict access with
+[access lists](https://github.com/netdata/netdata/blob/master/web/server/README.md#access-lists). This method also fully 
+retains the ability to stream metrics
+on-demand through Netdata Cloud.
+
+The `allow connections from` setting helps you allow only certain IP addresses or FQDN/hostnames, such as a trusted
+static IP, only `localhost`, or connections from behind a management LAN. 
+
+By default, this setting is `localhost *`. This setting allows connections from `localhost` in addition to _all_
+connections, using the `*` wildcard. You can change this setting using Netdata's [simple
+patterns](https://github.com/netdata/netdata/blob/master/libnetdata/simple_pattern/README.md).
+
+```conf
+[web]
+    # Allow only localhost connections
+    allow connections from = localhost
+
+    # Allow only from management LAN running on `10.X.X.X`
+    allow connections from = 10.*
+
+    # Allow connections only from a specific FQDN/hostname
+    allow connections from = example*
+```
+
+The `allow connections from` setting is global and restricts access to the dashboard, badges, streaming, API, and
+`netdata.conf`, but you can also set each of those access lists more granularly if you choose:
+
+```conf
+[web]
+    allow connections from = localhost *
+    allow dashboard from = localhost *
+    allow badges from = *
+    allow streaming from = *
+    allow netdata.conf from = localhost fd* 10.* 192.168.* 172.16.* 172.17.* 172.18.* 172.19.* 172.20.* 172.21.* 172.22.* 172.23.* 172.24.* 172.25.* 172.26.* 172.27.* 172.28.* 172.29.* 172.30.* 172.31.*
+    allow management from = localhost
+```
+
+See the [web server](https://github.com/netdata/netdata/blob/master/web/server/README.md#access-lists) docs for additional details
+about access lists. You can take
+access lists one step further by [enabling SSL](https://github.com/netdata/netdata/blob/master/web/server/README.md#enabling-tls-support) to encrypt data from local
+dashboard in transit. The connection to Netdata Cloud is always secured with TLS.
+
+## Use an authenticating web server in proxy mode
+
+Use one web server to provide authentication in front of **all your Netdata servers**. So, you will be accessing all your Netdata with 
+URLs like `http://{HOST}/netdata/{NETDATA_HOSTNAME}/` and authentication will be shared among all of them (you will sign-in once for all your servers). 
+Instructions are provided on how to set the proxy configuration to have Netdata run behind 
+[nginx](https://github.com/netdata/netdata/blob/master/docs/Running-behind-nginx.md), 
+[HAproxy](https://github.com/netdata/netdata/blob/master/docs/Running-behind-haproxy.md), 
+[Apache](https://github.com/netdata/netdata/blob/master/docs/Running-behind-apache.md), 
+[lighthttpd](https://github.com/netdata/netdata/blob/master/docs/Running-behind-lighttpd.md), 
+[caddy](https://github.com/netdata/netdata/blob/master/docs/Running-behind-caddy.md), and
+[H2O](https://github.com/netdata/netdata/blob/master/docs/Running-behind-h2o.md).
+
+## Use Netdata parents as Web Application Firewalls
+
+The Netdata Agents you install on your production systems do not need direct access to the Internet. Even when you use 
+Netdata Cloud, you can appoint one or more Netdata Parents to act as border gateways or application firewalls, isolating 
+your production systems from the rest of the world. Netdata 
+Parents receive metric data from Netdata Agents or other Netdata Parents on one side, and serve most queries using their own 
+copy of the data to satisfy dashboard requests on the other side.
+
+For more information see [Streaming and replication](https://github.com/netdata/netdata/blob/master/docs/metrics-storage-management/enable-streaming.md).
+
+## Other methods
+
+Of course, there are many more methods you could use to protect Netdata:
+
+-   Bind Netdata to localhost and use `ssh -L 19998:127.0.0.1:19999 remote.netdata.ip` to forward connections of local port 19998 to remote port 19999. 
+This way you can ssh to a Netdata server and then use `http://127.0.0.1:19998/` on your computer to access the remote Netdata dashboard.
+
+-   If you are always under a static IP, you can use the script given above to allow direct access to your Netdata servers without authentication, 
+from all your static IPs.
+
+-   Install all your Netdata in **headless data collector** mode, forwarding all metrics in real-time to a parent
+    Netdata server, which will be protected with authentication using an nginx server running locally at the parent
+    Netdata server. This requires more resources (you will need a bigger parent Netdata server), but does not require
+    any firewall changes, since all the child Netdata servers will not be listening for incoming connections.