Federated Reporting

Table of Contents

Overview

Federated Reporting enables the collection of data from multiple Hubs to provide a view in Mission Portal which can scale up beyond the capabilities of a Hub which manages hosts. CFEngine supports a large number of hosts per hub, around 5,000 hosts per hub depending on many factors. With Federated Reporting it is possible to scale up to 100,000 hosts or more for the purposes of analysis and reporting.

Hubs which hosts report to are called Feeder Hubs.

The hub which collects information from Feeder Hubs is called the Superhub.

If all hubs are version 3.14.0 or higher then Mission Portal can be used to configure and connect the Superhub and Feeder hubs. For Feeder hubs with an earlier version than 3.14.0 some manual steps must be taken. Links to these are provided at each stage of installation and setup that follows.

Requirements

Topology Requirements

At this time it is not possible to bootstrap agents to the Superhub. The Superhub itself will be present but the behavior of other agents bootstrapped to the Superhub is untested and unsupported.

Software Requirements

If your hub will have SELinux enabled, the semanage command must be installed. This allows Federated Reporting policy to manage the trust between the superhub and feeder hubs.

Add the cfengine_mp_fr_dependencies_auto_install to your augments file to allow federation policy to ensure that semanage is installed.

{
  "classes": {
    "cfengine_mp_fr_dependencies_auto_install" : ["any"]
  }
}

See cfengine_enterprise_federation:semanage_installed in cfe_internal/enterprise/federation/federation.cf for details on which packages are used for various distributions.

Hardware Requirements

The Superhub aggregates all the data from all the Feeders connected to it which is a periodically running resource intensive task. The key factors contributing to HW requirements for the Superhub are:

  • The refresh interval at which data is pulled from the Feeders and imported on the Superhub. The default is 20 minutes and it can be changed in the policy.

  • The amount of data gathered on the Feeders from the reports sent by the hosts bootstrapped to them.

The current implementation of Federated Reporting is not aggregating monitoring data on the Superhub which saves a lot of network traffic, processing power and disk space on the Superhub.

In order to utilize modern configurations, the operations on the Superhub run multiple tasks in parallel, one task per connected Feeder, and so with the increasing number of connected Feeders the number of available logical CPUs and I/O speed play an important role. As with any other batch processing the general rule is that each batch should finish processing before processing of the next batch starts. With the default settings that means that one round of pulling data from the Feeders and importing them into the local database on the Superhub should take less than 20 minutes. The policy will prevent two or more of such rounds from overlapping if one round takes more than 20 minutes, but such setup would degrade the freshness of the data available on the Superhub.

The recommended HW configuration for a Superhub with the default configuration and 5000 hosts per connected Feeder is:

  • 16 GiB of RAM or more,

  • 1 logical CPU per connected Feeder or more,

  • 5 MiB of disk space per host or more,

  • 1000 IOPS storage or faster,

  • 100 Mib/s network bandwidth per connected Feeder,

  • 135 KiB of network data transfer per host per one pull of the data from Feeders.

The Federated Reporting process is logging information to the system log and so timestamps from the log messages can be used to determine how long each round of the pull-import process has taken. If it is close to the configured refresh interval, the interval needs to be made longer or the hardware configuration of the Superhub needs to be enhanced.

The minimum HW requirements for the Superhub are very dependent on the two key factors mentioned above. It is thus highly recommended to connect the Feeders to the Superhub one or two at a time and check the intervals in the logs before connecting more Feeders.

Installation

The General Installation instructions should be used to install CFEngine Hub on a Superhub as well as Feeder hubs.

Setup

Enable Hub management app

Enable Hub Management

On the Superhub and all Feeders enable the Hub management app by Opening Settings then selecting Manage Apps and finally by clicking the On radio button for Hub management in the Status column.

Note: for pre 3.14 feeders this step is not performed.

Enable Federated Reporting

Enable Federated Reporting

The Hub management app should now appear in the bottom left corner of mission portal.

Click on the Enable Superhub or Enable Feeder button as appropriate. This will cause some configuration to be written in the filesystem and on next agent run policy will make the needed changes. You can speed up this process by running the agent manually.

Note: for pre 3.14 feeders, you must Enable feeder without API.

Connect Feeder Hubs

Connect Feeder Hubs

Refresh the Hub management on each hub to see that Federated Reporting is enabled.

After all hubs have Federated Reporting enabled visit Hub management on the Superhub to connect the Feeder hubs.

On the Superhub, click on the Connect hub button to show the Connect a hub dialog.

Connect a hub

Fill out the form with the base URL of your feeder hub Mission Portal and enter credentials for a user with administrative credentials. These credentials will only be used to authenticate to the feeder hub and will not be saved otherwise.

The Hub management view will show all connected hubs, the number of bootstrapped hosts and allow you to edit the settings.

Feeders connected

Operation

Now that everything is configured the Feeder hubs will generate a database dump every 20 minutes and the Superhub will pull any available dumps from each Feeder every 20 minutes as well.

You can test import immediately by running the agent on the feeders and then the superhub.

Duplicate Host Management

There are situations where feeder hubs may have hosts with duplicate hostkeys:

  • hosts are able to "float", re-bootstrap or failover to several different feeder hubs
  • hosts may be cloned and not have their hostkey refreshed by running cf-key and refreshing $(sys.workdir)/ppkeys/localhost.pub.

In the first case you will likely want to remove entries for hosts which are not the latest since the latest data will be most accurate. An augment is available to enable moving duplicated host data to a dup schema for analysis. The host data which has the most recent hosts.lastreporttimestamp will be kept in the public schema and all other data will be moved to the dup domain (schema).

This feature is disabled by default. If enabled it is performed on every import cycle.

{
  "classes": {
    "cfengine_mp_fr_handle_duplicate_hostkeys": ["any::"]
  }
}

This class only has an effect on the superhub host.

Troubleshooting

Please refer to /var/cfengine/output, /var/log/postgresql.log and /opt/cfengine/federation/superhub/import/*.log.gz when problems occur. Sending these logs to us in bug reports will help significantly as we fine tune the Federated Reporting feature.

Also see Disable Feeder for information about how to temporarily disable a feeder's participation in Federated Reporting in case that is causing an issue for the Feeder Hub.

API Setup

An API may be used instead of the UI. This could be used to automate the setup of infrastructure related to Federated Reporting and Feeder hubs.

Command line examples follow using curl and cf-remote.

Some environment variables should be set according to your environment so that you can simply copy/paste steps as you go.

$ export CLOUD_USER="ubuntu@"      # optional, just to save cf-remote from guessing/trying
$ export SUPERHUB=18.203.231.97
$ export SUPERHUB_BS=172.31.36.33  # _BS is bootstrap IP in case it needs to be different
$ export FEEDER=34.244.118.58
$ export FEEDER_BS=172.31.43.102   # _BS is bootstrap IP

Stop cf-execd on the superhub and feeder

We don't want periodic agent runs to get in our ways so let's disable cf-execd.

$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "systemctl stop cf-execd"

On systems not using systemd, cf-execd needs to be stopped in a different way. Also without systemd, any agent run restarts cf-execd so let's move it out of our ways.

$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "pkill cf-execd"
$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "mv /var/cfengine/bin/cf-execd /var/cfengine/bin/cf-execd.disabled"

Update masterfiles (hubs older than 3.14.0)

For hubs older than 3.14.0 the masterfiles must be updated to 3.14.0.

Follow instructions at Masterfiles Policy Framework upgrade.

Passwords

Export the password for the user with administrative rights that will make the API requests. In these examples the admin user is used. Any user with administrative rights can make these requests. It is also possible to customize the RBAC settings to make a user who only has rights to the needed api/fr APIs.

$ export PASSWORD="testingFR"

Enable superhub

$ curl -k -i -s -X POST -u admin:$PASSWORD https://$SUPERHUB/api/fr/setup-hub/superhub

Enable feeder

$ curl -k -i -s -X POST -u admin:$PASSWORD https://$FEEDER/api/fr/setup-hub/feeder

Enable feeder without API

For older hubs:

$ ssh $CLOUD_USER$FEEDER
$ sudo bash
$ cd /opt/cfengine/federation/cfapache
$ # press Ctrl-D to finish writing file
$ cat > federation-config.json
{
  "hostname": null,
  "role": "feeder",
  "target_state": "on",
  "remote_hubs": []
}
$

Trigger agent run

$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "/var/cfengine/bin/cf-agent -KI"

Ensure there are no errors in the agent run.

Note down SSH and hostkey details

$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "cat /opt/cfengine/federation/cfapache/setup-status.json"
ubuntu@52.215.88.224: 'cat /opt/cfengine/federation/cfapache/setup-status.json' -> '{'
ubuntu@52.215.88.224:                                                              '  "configured": true,'
ubuntu@52.215.88.224:                                                              '  "role": "superhub",'
ubuntu@52.215.88.224:                                                              '  "hostkey": "SHA=5628db8a4c5e6ba4f040ee1cafb3928abd966ebccb38b0045f91af67e91f9a16",'
ubuntu@52.215.88.224:                                                              '  "transport_ssh_public_key": "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHqMau6qL+iCzr6o1+k+1IwoI6Wj++dzEV/w5VGMKy9w root@ip-172-31-22-191",'
ubuntu@52.215.88.224:                                                              '  "transport_ssh_server_fingerprint": "|1|d7iPkk7pb7tyZ3Y8lpQv6PIGU54=|VutDe9dq5S9nxgFher0LAapKSas= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBIW7FD4nfpJThtjtPj5okXsiCEenZOKDZh2akX2pBFlMpwOExVqvZV/all/fSlbVzlZbuHNA99SQ7m9Scsn2o/c="'
ubuntu@52.215.88.224:                                                              '}'
ubuntu@34.241.127.1: 'cat /opt/cfengine/federation/cfapache/setup-status.json' -> '{'
ubuntu@34.241.127.1:                                                              '  "configured": true,'
ubuntu@34.241.127.1:                                                              '  "role": "feeder",'
ubuntu@34.241.127.1:                                                              '  "hostkey": "SHA=8451d14a876bf480da2cf30b3293954722792f721b69541f919bb263326fbc45",'
ubuntu@34.241.127.1:                                                              '  "transport_ssh_public_key": "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKnYDCbGfSIX/SOj+ZCeca1fX9HF1BdTjUHDyWPFG9Yh root@ip-172-31-27-84",'
ubuntu@34.241.127.1:                                                              '  "transport_ssh_server_fingerprint": "|1|UDqYbxUuV0BxrnpVMCZIjc7AIeg=|+TMJ8Cj3o4u8xy3mRSxfoTOdC7Q= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHqMOtNqVfryEpLK5rhib62hxSTe4DvTGEBy/Bhmb3tqlhhlRgsR1g0tDtNDkJZ12mnuAMntb8WV0j7SGm9+RYo="'
ubuntu@34.241.127.1:                                                              '}'
$ export SUPERHUB_HOSTKEY="SHA=5628db8a4c5e6ba4f040ee1cafb3928abd966ebccb38b0045f91af67e91f9a16"
$ export SUPERHUB_PUB="ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHqMau6qL+iCzr6o1+k+1IwoI6Wj++dzEV/w5VGMKy9w root@ip-172-31-22-191"
$ export SUPERHUB_FP="|1|d7iPkk7pb7tyZ3Y8lpQv6PIGU54=|VutDe9dq5S9nxgFher0LAapKSas= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBIW7FD4nfpJThtjtPj5okXsiCEenZOKDZh2akX2pBFlMpwOExVqvZV/all/fSlbVzlZbuHNA99SQ7m9Scsn2o/c="
$ export FEEDER_HOSTKEY="SHA=8451d14a876bf480da2cf30b3293954722792f721b69541f919bb263326fbc45"
$ export FEEDER_PUB="ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKnYDCbGfSIX/SOj+ZCeca1fX9HF1BdTjUHDyWPFG9Yh root@ip-172-31-27-84"
$ export FEEDER_FP="|1|UDqYbxUuV0BxrnpVMCZIjc7AIeg=|+TMJ8Cj3o4u8xy3mRSxfoTOdC7Q= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHqMOtNqVfryEpLK5rhib62hxSTe4DvTGEBy/Bhmb3tqlhhlRgsR1g0tDtNDkJZ12mnuAMntb8WV0j7SGm9+RYo="

Adding superhub to feeder

Construct a JSON for POST API

$ printf '{
  "ui_name": "superhub",
  "role": "superhub",
  "hostkey": "%s",
  "enabled": "true",
  "target_state": "on",
  "transport":
  {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "%s",
    "ssh_pubkey": "%s",
    "ssh_fingerprint": "%s"
  }
}
' "$SUPERHUB_HOSTKEY" "$SUPERHUB" "$SUPERHUB_PUB" "$SUPERHUB_FP" > superhub.json
$ cat superhub.json
{
  "ui_name": "superhub",
  "role": "superhub",
  "hostkey": "SHA=5628db8a4c5e6ba4f040ee1cafb3928abd966ebccb38b0045f91af67e91f9a16",
  "enabled": "true",
  "target_state": "on",
  "transport":
  {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "52.215.88.224",
    "ssh_pubkey": "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHqMau6qL+iCzr6o1+k+1IwoI6Wj++dzEV/w5VGMKy9w root@ip-172-31-22-191",
    "ssh_fingerprint": "|1|d7iPkk7pb7tyZ3Y8lpQv6PIGU54=|VutDe9dq5S9nxgFher0LAapKSas= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBIW7FD4nfpJThtjtPj5okXsiCEenZOKDZh2akX2pBFlMpwOExVqvZV/all/fSlbVzlZbuHNA99SQ7m9Scsn2o/c="
  }
}

Look at the cat output, ensure ssh_host, ssh_pubkey, and ssh_fingerprint are correct.

Use POST API to add superhub to feeder

$ curl -k -i -s -X POST -u admin:$PASSWORD https://$FEEDER/api/fr/remote-hub -d @superhub.json --header "Content-Type: application/json"
$ curl -k -i -s -X POST -u admin:$PASSWORD https://$FEEDER/api/fr/federation-config

(The second API call is needed to save the updated config to file, federation-config.json).

Note: for pre 3.14 feeders, you must Add superhub to feeder without API

Add superhub to feeder without API

To configure things without the API, just modify the /opt/cfengine/federation/cfapache/federation-config.json file on the feeder and add the superhub as a remote hub by adding this section:

$ printf '
  "remote_hubs": {
        "id-2": {
            "id": 2,
            "hostkey": "%s",
            "ui_name": "superhub",
            "role": "superhub",
            "target_state": "on",
            "transport": {
               "mode": "pull_over_rsync",
               "ssh_user": "cftransport",
               "ssh_host": "%s",
               "ssh_pubkey": "%s",
               "ssh_fingerprint": "%s"
            }
        }
  }
' "$SUPERHUB_HOSTKEY" "$SUPERHUB" "$SUPERHUB_PUB" "$SUPERHUB_FP"

(This isn't the entire file, just modify the remote_hubs section).

Adding feeder to superhub

Construct a JSON for POST API

$ printf '{
  "ui_name": "feeder",
  "role": "feeder",
  "hostkey": "%s",
  "api_url": "https://%s",
  "target_state": "on",
  "transport":
  {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "%s",
    "ssh_pubkey": "%s",
    "ssh_fingerprint": "%s"
  }
}
' "$FEEDER_HOSTKEY" "$FEEDER" "$FEEDER" "$FEEDER_PUB" "$FEEDER_FP" > feeder.json
$ cat feeder.json
{
  "ui_name": "feeder",
  "role": "feeder",
  "hostkey": "SHA=8451d14a876bf480da2cf30b3293954722792f721b69541f919bb263326fbc45",
  "api_url": "https://34.241.127.1",
  "target_state": "on",
  "transport":
  {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "34.241.127.1",
    "ssh_pubkey": "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKnYDCbGfSIX/SOj+ZCeca1fX9HF1BdTjUHDyWPFG9Yh root@ip-172-31-27-84",
    "ssh_fingerprint": "|1|UDqYbxUuV0BxrnpVMCZIjc7AIeg=|+TMJ8Cj3o4u8xy3mRSxfoTOdC7Q= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHqMOtNqVfryEpLK5rhib62hxSTe4DvTGEBy/Bhmb3tqlhhlRgsR1g0tDtNDkJZ12mnuAMntb8WV0j7SGm9+RYo="
  }
}

Look at the cat output, ensure ssh_host, ssh_pubkey, and ssh_fingerprint are correct.

Use POST API to add feeder to superhub

$ curl -k -i -s -X POST -u admin:$PASSWORD https://$SUPERHUB/api/fr/remote-hub -d @feeder.json --header "Content-Type: application/json"
$ curl -k -i -s -X POST -u admin:$PASSWORD https://$SUPERHUB/api/fr/federation-config

(The second API call is needed to save the updated config to file, federation-config.json).

Trigger agent runs

The agent run on the feeder will configure ssh and generate a dump. The agent run on the superhub will pull the data and import it. Check that each step works without errors:

$ cf-remote sudo -H $CLOUD_USER$FEEDER,$CLOUD_USER$SUPERHUB "/var/cfengine/bin/cf-agent -KI"

Do a manual collection of superhub data

At this point, the superhubs data has been deleted (replaced by feeder data). We can get the superhub to appear in MP by triggering a manual collection:

$ cf-remote sudo -H $SUPERHUB "/var/cfengine/bin/cf-hub -I -H $SUPERHUB_BS --query rebase"
$ cf-remote sudo -H $SUPERHUB "/var/cfengine/bin/cf-hub -I -H $SUPERHUB_BS --query delta"

Start cf-execd on the superhub and feeder

Let's switch back to ordinary mode of periodic agent runs.

$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "systemctl start cf-execd"

On systems running systemd, we need to rename the binary back and start it manually.

$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "mv /var/cfengine/bin/cf-execd.disabled /var/cfengine/bin/cf-execd"
$ cf-remote sudo -H $CLOUD_USER$SUPERHUB,$CLOUD_USER$FEEDER "/var/cfengine/bin/cf-execd"

Disable Feeder

Edit Hub Disable

A Feeder Hub may be disabled from the Hub Management app so that it will no longer participate in Federated Reporting. No further attempts to pull data from that feeder will occur until it is enabled again.

Click the edit button for the feeder, enter URL and credentials information as needed, uncheck the "Enable reporting to superhub" and click the "Update connected hub" button.

The list of connected hubs should now reflect the disabled state.

Disabled Feeder

Uninstall

Uninstalling Federated Reporting from a superhub is not possible at this time.

In order to remove Federated Reporting from a feeder you must set the target_state to off. On the next agent run the cftransport user will be removed, thus removing the trust established with the superhub and causing no further dump/import procedures to occur.

There are two ways to change the target_state of a feeder.

  • Use the hub-state API (requires version 3.14.0 or greater on the feeder hub)
  • Edit federation-config.json (any version)

Uninstall with the API

$ cat > target-state-off.json
{
  "target_state": "off"
}

$ curl -k -i -s -X PUT -u admin:$PASSWORD https://$FEEDER/api/fr/hub-state -d @target-state-off.json --header "Content-Type: application/json"

Uninstall without API

Edit /opt/cfengine/federation/cfapache/federation-config.json on the feeder you wish to disable and change the top-level target_state property value to off.

{
  "ui_name": "feeder1",
  "role": "feeder",
  "enabled": "true",
  "target_state": "off",
  "transport":
  {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "<superhub-ip>",
    "ssh_pubkey": "<public key>",
    "ssh_fingerprint": "<ssh fingerprint>"
  }
}

Remove Feeder from Mission Portal Hub Management

At this time it is not possible to remove a connected hub in the Mission Portal Hub management app. The recommended way to remove a connected hub is with the API.

First list all feeders to find the id value. Use of jq is optional for pretty printing the JSON.

$ curl -k -s -X GET -u admin:$PASSWORD https://$SUPERHUB/api/fr/remote-hub | jq '.'

{
  "id": 1,
  "hostkey": "SHA=cd4be31f20f0c7d019a5d3bfe368415f2d34fec8af26ee28c4c123c6a0af49a2",
  "api_url": "https://100.90.80.70",
  "ui_name": "feeder1",
  "role": "feeder",
  "target_state": "on",
  "transport": {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "172.32.1.20",
    "ssh_pubkey": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDVGoBB3zLKfVTzDNum/JWlmNJrSuDGrhTW1ZGtZEKjxFViFr4j0F8s6gIr5KOMcWtd91XvW6klpCPqKH3lfY767AI/RQa8JgVXgtvUG8rkD+gJ/wzGJm+VoGpxxs9dyBgSOtkaOSIDc574Om8dBR8enRcgxo1cNpvDVLVYKx9IzqhBwqp1gzEtGoIi+CDoGmoj1BT9XTlCRvGXYmSSBrgLARVO2mh5iqhP0XRVCp9Ki6OB9vMcs9rxIgQaPt8tVCt7/FK03IXrWPUsJC4M/kXiaKgHlE96H0CEvYl7GczaIU2NN5AHXZlviL79Zb8kOcUzsMdKv40G9YVa7/kyDOUX root@ip-172-32-1-20",
    "ssh_fingerprint": "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBF18li5PyCyVy27+Lv09HDRxhyEnlL+zK++WaLc78W+Gji5i2VSRDg/jVV0xU2ZUmkohULZ66OmI5/sCOOIa3XU=\nssh-ed25519"
  },
  "statistics": []
}
{
  "id": 2,
  "hostkey": "SHA=30b6bb15fb94c9b7e386521bbe566934d266db2f6f63cd85f5e6fc406d11110b",
  "api_url": "https://100.90.80.60",
  "ui_name": "feeder2",
  "role": "feeder",
  "target_state": "on",
  "transport": {
    "mode": "pull_over_rsync",
    "ssh_user": "cftransport",
    "ssh_host": "172.32.1.21",
    "ssh_pubkey": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDin59ffTXhtQxahrYkqNi3x36XIO08GnOvvVe3s+DmuT3kBn8Lh4P30kOVONSGKcfNZLnWVPrk2qqNWuEi6xg861G1kXqce02c26BW+4L/tnz86/kmTBGc2vb6d1NpEKA/1bg6bMf1da+EInxuMsS+yOWCe+s6DJ00bg6iCnmlLYtzAkMXmXK5QgVG6AImJXqG1Px5DlsRcKto00J8WJswfTpQXbZbuog4J6Ltm/J4DQW1/x7pEJby/r+/lKPJWp19t0gaGXfsxwHEPFK6YC8zmFzkBeqiVpAizhs7G8mZDgAAhMyY8d2eYIp+hDIFpfQA3aHHr0L7emsFeDa/rExt root@ip-172-32-1-21",
    "ssh_fingerprint": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC7HE4qJfTLP9j02jZnkpTpUMCBiFzmAemgvIPcJjWJVNcawh1hpGSsWjw9EM1kwn7J6fWrjEkY8lTi2pNTnobL9qt+oQvwFqUvs5EZ8gAVIAyDjKE8GLckZRt8VGxLWMtOlBKaAmPBn0eFP6ToPqnPygJiiM05vKtxPui1xuCTrW+rXShtolUJLwwGH2APcDqjKAdZceQK4nybJzk4J1P77sJc+9IlHJCTpfj8AQEbh/Z3cHtNKauaz1mhDn5YT/QWwzKavGlqFSlSDwLXT2go6P6FoSaVYTV45V9l7q6ahEy3zEe7+7psMFVucS512qYFEKn5FoSIVQLgT3I8MfI1\necdsa-sha2-nistp256"
  },
  "statistics": []
}

Determine the id from the "id" property value and delete the remote hub. In this case we use the number "1".

$ curl -k -s -X DELETE -u admin:$PASSWORD https://$SUPERHUB/api/fr/remote-hub/1