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+# 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>