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Version: 22.10

Managing client/server communication

Centreon Gorgone is the component that allows the communication from the central server to the pollers and remote servers. In addition, Gorgone deploys the configuration of the monitoring engines.

Gorgone replaces Centcore since the Centreon 20.04 version.

Centreon recommends to use the ZMQ protocol for the communication between two gorgoned processes. When using the ZMQ protocol, all communications are encrypted using symmetric-key encryption based on public/private keys from both client and server. So you need to generate public/private keys to set the configuration.

In a Centreon context:

  • the Central server has a Gorgone running (by default) as a client and can connect to Gorgone servers running on remote servers and pollers.
  • Remote servers have a Gorgone running (by default) as a client and can connect to Gorgone servers running on pollers.

Follow this procedure to set the communication between client and server.

Generate private and public keys​

On both client and server, generate RSA (format for key encryption) private and public keys using the centreon user.

$ mkdir -p /var/spool/centreon/.gorgone/
$ chmod 700 /var/spool/centreon/.gorgone
$ openssl genrsa -out /var/spool/centreon/.gorgone/privkey.pem 4092
Generating RSA private key, 4092 bit long modulus
...................................++
...........................................................................................................................................................................++
e is 65537 (0x10001)
$ openssl rsa -in /var/spool/centreon/.gorgone/privkey.pem -out /var/spool/centreon/.gorgone/pubkey.pem -pubout -outform PEM
writing RSA key
$ chmod 644 /var/spool/centreon/.gorgone/pubkey.pem
$ chmod 600 /var/spool/centreon/.gorgone/privkey.pem

Copy the server's public key onto the client in a specific directory (for example /var/spool/centreon/.gorgone<target_id>).

Get the string-formatted JWK thumbprint​

On the client side, execute the following command:

$ perl /usr/local/bin/gorgone_key_thumbprint.pl --key-path='/var/spool/centreon/.gorgone/pubkey.pem'
2019-09-30 11:00:00 - INFO - File '/var/spool/centreon/.gorgone/pubkey.pem' JWK thumbprint: pnI6EWkiTbazjikJXRkLmjml5wvVECYtQduJUjS4QK4

Set the configurations​

You need to make the Gorgone IDs match the Centreon pollers ID to benefit from legacy command module's actions.

On the server side​

In the /etc/centreon/confid.d/20-gorgoned.yaml configuration file, add the following directives under the gorgonecore section:

gorgone:
  gorgonecore:
    id: 1
    privkey: /var/spool/centreon/.gorgone/privkey.pem
    pubkey: /var/spool/centreon/.gorgone/pubkey.pem

Add the register module and define the path to the dedicated configuration file.

modules:
  - name: register
    package: "gorgone::modules::core::register::hooks"
    enable: true
    config_file: /etc/centreon/gorgone-targets.yml

Create the file /etc/centreon/gorgone-targets.yml and fill it with the following configuration:

  nodes:
  - id: 2
    type: push_zmq
    address: 10.1.2.3
    port: 5556

On the client side​

In the /etc/centreon/config.d/20-gorgoned.yaml configuration file, add the following directives:

gorgone:
  gorgonecore:
    id: 2
    external_com_type: tcp
    external_com_path: "*:5556"
    privkey: /var/spool/centreon/.gorgone/privkey.pem
    pubkey: /var/spool/centreon/.gorgone/pubkey.pem
    authorized_clients:
      - key: pnI6EWkiTbazjikJXRkLmjml5wvVECYtQduJUjS4QK4

The authorized_clients entry allows you to define the client public key thumbprint retrieved earlier.