# Installation de la supervision sur une machine virtuelle

## Générer un ticket sur isengard.libre-en-communs.org

    sudo icinga2 pki ticket --cn NOM_DE_DOMAINE_DE_VM

On obtient un ticket à noter dans l'issue. Il sera redemandé plus tard. 

## En SSH sur la machine virtuelle, installer l'agent de supervision

    sudo apt install icinga2 monitoring-plugins monitoring-plugins-contrib

## Modifier la configuration de la sonde de mémoire vive (pour corriger un bug)

<details>
<summary>/usr/share/icinga2/include/plugins-contrib.d/operating-system.conf</summary>

    object CheckCommand "mem" {
        command = [ PluginContribDir + "/check_memory" ]

        arguments = {
                "-u" = {
                        set_if = "$mem_used$"
                        description = "Check USED memory"
                }
                "-f" = {
                        set_if = "$mem_free$"
                        description = "Check FREE memory"
                }
                "-C" = {
                        set_if = "$mem_cache$"
                        description = "Count OS caches as FREE memory"
                }
                "-w" = {
                        value = "$mem_warning$"
                        description = "Percent free/used when to warn"
                }
                "-c" = {
                        value = "$mem_critical$"
                        description = "Percent free/used when critical"
                }
        }

        vars.mem_used = false
        vars.mem_free = false
        vars.mem_cache = false
    }

</details>

## Connecter notre agent au serveur de supervision

    sudo icinga2 node wizard

<details>
<summary>On réalise la configuration interactive suivante:</summary>

    Welcome to the Icinga 2 Setup Wizard!

    We will guide you through all required configuration details.

    Please specify if this is an agent/satellite setup ('n' installs a master setup) [Y/n]: 

    Starting the Agent/Satellite setup routine...

    Please specify the common name (CN) [NOM_DE_DOMAINE_DE_VM]: 

    Please specify the parent endpoint(s) (master or satellite) where this node should connect to:
    Master/Satellite Common Name (CN from your master/satellite node): isengard.libre-en-communs.org

    Do you want to establish a connection to the parent node from this node? [Y/n]: 
    Please specify the master/satellite connection information:
    Master/Satellite endpoint host (IP address or FQDN): isengard.libre-en-communs.org
    Master/Satellite endpoint port [5665]: 

    Add more master/satellite endpoints? [y/N]: 
    Parent certificate information:

    Version:             3
    Subject:             CN = isengard.libre-en-communs.org
    Issuer:              CN = Icinga CA
    Valid From:          Dec  9 14:36:07 2021 GMT
    Valid Until:         Dec  5 14:36:07 2036 GMT
    Serial:              c4:3f:53:b2:cf:09:f7:b5:2e:88:39:03:e9:96:c8:fc:99:a1:ca:3a

    Signature Algorithm: sha256WithRSAEncryption
    Subject Alt Names:   isengard.libre-en-communs.org
    Fingerprint:         54 78 22 83 24 22 3A A7 FD 00 01 E4 10 67 71 B6 CA 3E A2 71 93 63 F8 64 29 E9 45 1F D1 35 A9 95 

    Is this information correct? [y/N]: y

    Please specify the request ticket generated on your Icinga 2 master (optional).
    (Hint: # icinga2 pki ticket --cn 'NOM_DE_DOMAINE_DE_VM'):  INSERER_NUMERO_DE_TICKET_ICI
    Please specify the API bind host/port (optional):
    Bind Host []: 
    Bind Port []: 

    Accept config from parent node? [y/N]: y
    Accept commands from parent node? [y/N]: y

    Reconfiguring Icinga...
    Disabling feature notification. Make sure to restart Icinga 2 for these changes to take effect.
    Enabling feature api. Make sure to restart Icinga 2 for these changes to take effect.

    Local zone name [NOM_DE_DOMAINE_DE_VM]: 
    Parent zone name [master]: 

    Default global zones: global-templates director-global
    Do you want to specify additional global zones? [y/N]: 

    Do you want to disable the inclusion of the conf.d directory [Y/n]: 
    Disabling the inclusion of the conf.d directory...

    Done.

    Now restart your Icinga 2 daemon to finish the installation!

</details>

## Créer le fichier de zone pour la nouvelle machine dans isengard.libre-en-communs.org

<details>
<summary>/etc/icinga2/zones.d/master/NOM_DE_DOMAINE_DE_VM.conf</summary>

    object Endpoint "NOM_DE_DOMAINE_DE_VM" {
    }

    object Zone "NOM_DE_DOMAINE_DE_VM" {
    endpoints = [ "NOM_DE_DOMAINE_DE_VM" ]
    parent = "master"
    }

    object Host "NOM_DE_DOMAINE_DE_VM" {
        import "generic-host"
        address  = "NOM_DE_DOMAINE_DE_VM"
        address6 = "NOM_DE_DOMAINE_DE_VM"
        vars.os = "GNU/Linux"
        vars.client_endpoint = name

        vars.notification["mail"] = {  
            groups = [ "icingaadmins" ]  
        }  

    }

</details>