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Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!--
+title: "Agent claiming"
+description: "Agent claiming allows a Netdata Agent, running on a distributed node, to securely connect to Netdata Cloud via the encrypted Agent-Cloud link (ACLK)."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/claim/README.md
+-->
+
+# Agent claiming
+
+Agent claiming allows a Netdata Agent, running on a distributed node, to securely connect to Netdata Cloud. A Space's
+administrator creates a **claiming token**, which is used to add an Agent to their Space via the [Agent-Cloud link
+(ACLK)](/aclk/README.md).
+
+Are you just starting out with Netdata Cloud? See our [get started with
+Cloud](https://learn.netdata.cloud/docs/cloud/get-started) guide for a walkthrough of the process and simplified
+instructions.
+
+Claiming nodes is a security feature in Netdata Cloud. Through the process of claiming, you demonstrate in a few ways
+that you have administrative access to that node and the configuration settings for its Agent. By logging into the node,
+you prove you have access, and by using the claiming script or the Netdata command line, you prove you have write access
+and administrative privileges.
+
+Only the administrators of a Space in Netdata Cloud can view the claiming token and accompanying script generated by
+Netdata Cloud.
+
+> The claiming process ensures no third party can add your node, and then view your node's metrics, in a Cloud account,
+> Space, or War Room that you did not authorize.
+
+By claiming a node, you opt-in to sending data from your Agent to Netdata Cloud via the [ACLK](/aclk/README.md). This
+data is encrypted by TLS while it is in transit. We use the RSA keypair created during claiming to authenticate the
+identity of the Agent when it connects to the Cloud. While the data does flow through Netdata Cloud servers on its way
+from Agents to the browser, we do not store or log it.
+
+You can claim a node during the Cloud onboarding process, or after you created a Space by clicking on the **USER's
+Space** dropdown, then **Manage claimed nodes**.
+
+There are two important notes regarding claiming:
+
+-   _You can only claim any given node in a single Space_. You can, however, add that claimed node to multiple War Rooms
+    within that one Space.
+-   You must repeat the claiming process on every node you want to add to Netdata Cloud.
+
+## How to claim a node
+
+To claim a node, select which War Rooms you want to add this node to with the dropdown, then copy and paste the script
+given by Cloud into your node's terminal. Hit **Enter**.
+
+```bash
+sudo netdata-claim.sh -token=TOKEN -rooms=ROOM1,ROOM2 -url=https://app.netdata.cloud
+```
+
+The script should return `Agent was successfully claimed.`. If the claiming script returns errors, or if you don't see
+the node in your Space after 60 seconds, see the [troubleshooting information](#troubleshooting). If you prefer not to
+use root privileges via `sudo` to run the claiming script, see the next section.
+
+Repeat this process with every node you want to add to Cloud during onboarding. You can also add more nodes once you've
+finished onboarding.
+
+### Claim an agent without root privileges
+
+If you don't want to run the claiming script with root privileges, you can discover which user is running the Agent,
+switch to that user, and run the claiming script.
+
+Use `grep` to search your `netdata.conf` file, which is typically located at `/etc/netdata/netdata.conf`, for the `run
+as user` setting. For example:
+
+```bash
+grep "run as user" /etc/netdata/netdata.conf 
+    # run as user = netdata
+```
+
+The default user is `netdata`. Yours may be different, so pay attention to the output from `grep`. Switch to that user
+and run the claiming script.
+
+```bash
+netdata-claim.sh -token=TOKEN -rooms=ROOM1,ROOM2 -url=https://app.netdata.cloud
+```
+
+Hit **Enter**. The script should return `Agent was successfully claimed.`. If the claiming script returns errors, or if
+you don't see the node in your Space after 60 seconds, see the [troubleshooting information](#troubleshooting). 
+
+### Claim an Agent running in Docker
+
+The claiming process works with Agents running inside of Docker containers. You can use `docker exec` to run the
+claiming script on containers already running, or append the claiming script to `docker run` to create a new container
+and immediately claim it.
+
+#### Running Agent containers
+
+Claim a _running Agent container_ by appending the script offered by Cloud to a `docker exec ...` command, replacing
+`netdata` with the name of your running container:
+
+```bash
+docker exec -it netdata netdata-claim.sh -token=TOKEN -rooms=ROOM1,ROOM2 -url=https://app.netdata.cloud
+```
+
+The script should return `Agent was successfully claimed.`. If the claiming script returns errors, or if
+you don't see the node in your Space after 60 seconds, see the [troubleshooting information](#troubleshooting).
+
+#### New/ephemeral Agent containers
+
+Claim a newly-created container with `docker run ...`.
+
+In the example below, the last line calls the [daemon binary](/daemon/README.md), sets essential variables, and then
+executes claiming using the information after `-W "claim... `. You should copy the relevant token, rooms, and URL from
+Cloud.
+
+```bash
+docker run -d --name=netdata \
+  -p 19999:19999 \
+  -v netdatalib:/var/lib/netdata \
+  -v netdatacache:/var/cache/netdata \
+  -v /etc/passwd:/host/etc/passwd:ro \
+  -v /etc/group:/host/etc/group:ro \
+  -v /proc:/host/proc:ro \
+  -v /sys:/host/sys:ro \
+  -v /etc/os-release:/host/etc/os-release:ro \
+  --restart unless-stopped \
+  --cap-add SYS_PTRACE \
+  --security-opt apparmor=unconfined \
+  netdata/netdata \
+  -W set2 cloud global enabled true -W set2 cloud global "cloud base url" "https://app.netdata.cloud" -W "claim \
+  -token=TOKEN \
+  -rooms=ROOM1,ROOM2 \
+  -url=https://app.netdata.cloud"
+```
+
+The container runs in detached mode, so you won't see any output. If the node does not appear in your Space, you can run
+the following to find any error output and use that to guide your [troubleshooting](#troubleshooting). Replace `netdata`
+with the name of your container if different.
+
+```bash
+docker logs netdata 2>&1 | grep -E --line-buffered 'ACLK|claim|cloud'
+```
+
+### Claim a Kubernetes cluster's parent Netdata pod
+
+Read our [Kubernetes installation](/packaging/installer/methods/kubernetes.md#claim-a-kubernetes-clusters-parent-pod)
+for details on claiming a parent Netdata pod.
+
+### Claim through a proxy
+
+A Space's administrator can claim a node through a SOCKS5 or HTTP(S) proxy.
+
+You should first configure the proxy in the `[cloud]` section of `netdata.conf`. The proxy settings you specify here
+will also be used to tunnel the ACLK. The default `proxy` setting is `none`.
+
+```conf
+[cloud]
+    proxy = none
+```
+
+The `proxy` setting can take one of the following values:
+
+-   `none`: Do not use a proxy, even if the system configured otherwise.
+-   `env`: Try to read proxy settings from set environment variables `http_proxy`/`socks_proxy`.
+-   `socks5[h]://[user:pass@]host:ip`: The ACLK and claiming will use the specified SOCKS5 proxy.
+-   `http://[user:pass@]host:ip`: The ACLK and claiming will use the specified HTTP(S) proxy.
+
+For example, a SOCKS5 proxy setting may look like the following:
+
+```conf
+[cloud]
+    proxy = socks5h://203.0.113.0:1080       # With an IP address
+    proxy = socks5h://proxy.example.com:1080 # With a URL
+```
+
+You can now move on to claiming. When you claim with the `netdata-claim.sh` script, add the `-proxy=` parameter and
+append the same proxy setting you added to `netdata.conf`.
+
+```bash
+sudo netdata-claim.sh -token=MYTOKEN1234567 -rooms=room1,room2 -url=https://app.netdata.cloud -proxy=socks5h://203.0.113.0:1080
+```
+
+Hit **Enter**. The script should return `Agent was successfully claimed.`. If the claiming script returns errors, or if
+you don't see the node in your Space after 60 seconds, see the [troubleshooting information](#troubleshooting).
+
+### Troubleshooting
+
+If you're having trouble claiming a node, this may be because the [ACLK](/aclk/README.md) cannot connect to Cloud.
+
+With the Netdata Agent running, visit `http://NODE:19999/api/v1/info` in your browser, replacing `NODE` with the IP
+address or hostname of your Agent. The returned JSON contains four keys that will be helpful to diagnose any issues you
+might be having with the ACLK or claiming process.
+
+```json
+	"cloud-enabled"
+	"cloud-available"
+	"agent-claimed"
+	"aclk-available"
+```
+
+Use these keys and the information below to troubleshoot the ACLK.
+
+#### bash: netdata-claim.sh: command not found
+
+If you run the claiming script and see a `command not found` error, you either installed Netdata in a non-standard
+location or are using an unsupported package. If you installed Netdata in a non-standard path using the `--install`
+option, you need to update your `$PATH` or run `netdata-claim.sh` using the full path. For example, if you installed
+Netdata to `/opt/netdata`, use `/opt/netdata/bin/netdata-claim.sh` to run the claiming script.
+
+If you are using an unsupported package, such as a third-party `.deb`/`.rpm` package provided by your distribution,
+please remove that package and reinstall using our [recommended kickstart
+script](/docs/get/README.md#install-the-netdata-agent).
+
+#### Claiming on older distributions (Ubuntu 14.04, Debian 8, CentOS 6)
+
+If you're running an older Linux distribution or one that has reached EOL, such as Ubuntu 14.04 LTS, Debian 8, or CentOS
+6, your Agent may not be able to securely connect to Netdata Cloud due to an outdated version of OpenSSL. These old
+versions of OpenSSL cannot perform [hostname validation](https://wiki.openssl.org/index.php/Hostname_validation), which
+helps securely encrypt SSL connections.
+
+We recommend you reinstall Netdata with a [static build](/packaging/installer/methods/kickstart-64.md), which uses an
+up-to-date version of OpenSSL with hostname validation enabled.
+
+If you choose to continue using the outdated version of OpenSSL, your node will still connect to Netdata Cloud, albeit
+with hostname verification disabled. Without verification, your Netdata Cloud connection could be vulnerable to
+man-in-the-middle attacks.
+
+#### cloud-enabled is false
+
+If `cloud-enabled` is `false`, you probably ran the installer with `--disable-cloud` option.
+
+Additionally, check that the `enabled` setting in `var/lib/netdata/cloud.d/cloud.conf` is set to `true`:
+
+```conf
+[global]
+    enabled = true
+```
+
+To fix this issue, reinstall Netdata using your [preferred method](/packaging/installer/README.md) and do not add the
+`--disable-cloud` option.
+
+#### cloud-available is false
+
+If `cloud-available` is `false` after you verified Cloud is enabled in the previous step, the most likely issue is that
+Cloud features failed to build during installation.
+
+If Cloud features fail to build, the installer continues and finishes the process without Cloud functionality as opposed
+to failing the installation altogether. We do this to ensure the Agent will always finish installing.
+
+If you can't see an explicit error in the installer's output, you can run the installer with the `--require-cloud`
+option. This option causes the installation to fail if Cloud functionality can't be built and enabled, and the
+installer's output should give you more error details.
+
+You may see one of the following error messages during installation:
+
+-   Failed to build libmosquitto. The install process will continue, but you will not be able to connect this node to
+    Netdata Cloud.
+-   Unable to fetch sources for libmosquitto. The install process will continue, but you will not be able to connect
+    this node to Netdata Cloud.
+-   Failed to build libwebsockets. The install process will continue, but you may not be able to connect this node to
+    Netdata Cloud.
+-   Unable to fetch sources for libwebsockets. The install process will continue, but you may not be able to connect
+    this node to Netdata Cloud.
+-   Could not find cmake, which is required to build libwebsockets. The install process will continue, but you may not
+    be able to connect this node to Netdata Cloud.
+-   Could not find cmake, which is required to build JSON-C. The install process will continue, but Netdata Cloud
+    support will be disabled.
+-   Failed to build JSON-C. Netdata Cloud support will be disabled.
+-   Unable to fetch sources for JSON-C. Netdata Cloud support will be disabled.
+
+One common cause of the installer failing to build Cloud features is not having one of the following dependencies on
+your system: `cmake` and OpenSSL, including the `devel` package.
+
+You can also look for error messages in `/var/log/netdata/error.log`. Try one of the following two commands to search
+for ACLK-related errors.
+
+```bash
+less /var/log/netdata/error.log
+grep -i ACLK /var/log/netdata/error.log
+```
+
+If the installer's output does not help you enable Cloud features, contact us by [creating an issue on
+GitHub](https://github.com/netdata/netdata/issues/new?labels=bug%2C+needs+triage%2C+ACLK&template=bug_report.md&title=The+installer+failed+to+prepare+the+required+dependencies+for+Netdata+Cloud+functionality)
+with details about your system and relevant output from `error.log`.
+
+#### agent-claimed is false
+
+You must [claim your node](#how-to-claim-a-node).
+
+#### aclk-available is false
+
+If `aclk-available` is `false` and all other keys are `true`, your Agent is having trouble connecting to the Cloud
+through the ACLK. Please check your system's firewall.
+
+If your Agent needs to use a proxy to access the internet, you must [set up a proxy for
+claiming](#claim-through-a-proxy).
+
+If you are certain firewall and proxy settings are not the issue, you should consult the Agent's `error.log` at
+`/var/log/netdata/error.log` and contact us by [creating an issue on
+GitHub](https://github.com/netdata/netdata/issues/new?labels=bug%2C+needs+triage%2C+ACLK&template=bug_report.md&title=ACLK-available-is-false)
+with details about your system and relevant output from `error.log`.
+
+### Remove and reclaim a node
+
+To remove a node from your Space in Netdata Cloud, delete the `cloud.d/` directory in your Netdata library directory.
+
+```bash
+cd /var/lib/netdata   # Replace with your Netdata library directory, if not /var/lib/netdata/
+sudo rm -rf cloud.d/
+```
+
+This node no longer has access to the credentials it was claimed with and cannot connect to Netdata Cloud via the ACLK.
+You will still be able to see this node in your War Rooms in an **unreachable** state.
+
+If you want to reclaim this node into a different Space, you need to create a new identity by adding `-id=$(uuidgen)` to
+the claiming script parameters. Make sure that you have the `uuidgen-runtime` package installed, as it is used to run the command `uuidgen`. For example, using the default claiming script:
+
+```bash
+sudo netdata-claim.sh -token=TOKEN -rooms=ROOM1,ROOM2 -url=https://app.netdata.cloud -id=$(uuidgen)
+```
+
+The agent _must be restarted_ after this change.
+
+## Claiming reference
+
+In the sections below, you can find reference material for the claiming script, claiming via the Agent's command line
+tool, and details about the files found in `cloud.d`.
+
+### The `cloud.conf` file
+
+This section defines how and whether your Agent connects to [Netdata Cloud](https://learn.netdata.cloud/docs/cloud/)
+using the [ACLK](/aclk/README.md).
+
+| setting        | default                   | info                                                                                                                                   |
+|:-------------- |:------------------------- |:-------------------------------------------------------------------------------------------------------------------------------------- |
+| cloud base url | https://app.netdata.cloud | The URL for the Netdata Cloud web application. You should not change this. If you want to disable Cloud, change the `enabled` setting. |
+| enabled        | yes                       | The runtime option to disable the [Agent-Cloud link](/aclk/README.md) and prevent your Agent from connecting to Netdata Cloud.         |
+
+### Claiming script
+
+A Space's administrator can claim an Agent by directly calling the `netdata-claim.sh` script either with root privileges
+using `sudo`, or as the user running the Agent (typically `netdata`), and passing the following arguments:
+
+```sh
+-token=TOKEN
+    where TOKEN is the Space's claiming token.
+-rooms=ROOM1,ROOM2,...
+    where ROOMX is the War Room this node should be added to. This list is optional.
+-url=URL_BASE
+    where URL_BASE is the Netdata Cloud endpoint base URL. By default, this is https://app.netdata.cloud.
+-id=AGENT_ID
+    where AGENT_ID is the unique identifier of the Agent. This is the Agent's MACHINE_GUID by default.
+-hostname=HOSTNAME
+    where HOSTNAME is the result of the hostname command by default.
+-proxy=PROXY_URL
+    where PROXY_URL is the endpoint of a SOCKS5 proxy.
+```
+
+For example, the following command claims an Agent and adds it to rooms `room1` and `room2`:
+
+```sh
+netdata-claim.sh -token=MYTOKEN1234567 -rooms=room1,room2
+```
+
+You should then update the `netdata` service about the result with `netdatacli`:
+
+```sh
+netdatacli reload-claiming-state
+```
+
+This reloads the Agent claiming state from disk.
+
+### Netdata Agent command line
+
+If a Netdata Agent is running, the Space's administrator can claim a node using the `netdata` service binary with
+additional command line parameters:
+
+```sh
+-W "claim -token=TOKEN -rooms=ROOM1,ROOM2"
+```
+
+For example:
+
+```sh
+/usr/sbin/netdata -D -W "claim -token=MYTOKEN1234567 -rooms=room1,room2"
+```
+
+If need be, the user can override the Agent's defaults by providing additional arguments like those described
+[here](#claiming-script).
+
+### Claiming directory
+
+Netdata stores the Agent's claiming-related state in the Netdata library directory under `cloud.d`. For a default
+installation, this directory exists at `/var/lib/netdata/cloud.d`. The directory and its files should be owned by the
+user that runs the Agent, which is typically the `netdata` user.
+
+The `cloud.d/token` file should contain the claiming-token and the `cloud.d/rooms` file should contain the list of War
+Rooms you added that node to.
+
+The user can also put the Cloud endpoint's full certificate chain in `cloud.d/cloud_fullchain.pem` so that the Agent
+can trust the endpoint if necessary.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fclaim%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)