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--- informatica:linux:keepalived [2021/06/03 11:26] – created javi
+++ informatica:linux:keepalived [2021/06/03 12:08] (current) – javi
@@ Line 18: / Line 18: @@
 En este ejemplo la IP flotante será '8.8.8.8'.
-==== Master ====
 . Crear archivo:
@@ Line 61: / Line 59: @@
 Comentarios:
+  * State. Is MASTER for one and BACKUP for all other hosts, hence the virtual IP will initially be assigned to the MASTER.
+  * Interface. Is the network interface taking part in the negotiation of the virtual IP, e.g. eth0.
+  * Virtual_router_id. Should be the same for all keepalived cluster hosts while unique amongst all clusters in the same subnet. Many distros pre-configure its value to 51.
+  * Priority. Should be higher on the control plane node than on the backups. Hence 101 and 100 respectively will suffice.
+  * Auth_pass. Should be the same for all keepalived cluster hosts, e.g. 42
+  * Virtual_ipaddress. Is the virtual IP address negotiated between the keepalived cluster hosts.
+. Crear archivo:
+  sudo vim /etc/keepalived/check_apiserver.sh
+Con el siguiente contenido:
+<code>
+#!/bin/sh
+errorExit() {
+    echo "*** $*" 1>&2
+    exit 1
+}
+curl --silent --max-time 2 --insecure http://localhost/ -o /dev/null || errorExit "Error GET https://localhost/"
+if ip addr | grep -q 8.8.8.8; then
+    curl --silent --max-time 2 --insecure http://8.8.8.8/ -o /dev/null || errorExit "Error GET http://8.8.8.8/"
+fi
+</code>
+Reemplazar '8.8.8.8' por la IP flotante a usar.
+. Dar permisos de ejecución:
+  sudo chmod +x /etc/keepalived/check_apiserver.sh
+. Habilitar el servicio keepalived:
+  sudo systemctl enable keepalived --now
+. Repetir los pasos 1 a 4 para el resto de nodos, ajustando los valores según los comentarios de cada paso
+. Probar:
+.1. Ejecutar:
+  wget http://8.8.8.8
+Reemplazar '8.8.8.8' por la IP flotante a usar.
+.2. Apagar el nodo que tenga la IP flotante en ese momento
-    ${STATE} is MASTER for one and BACKUP for all other hosts, hence the virtual IP will initially be assigned to the MASTER.
+.3. Repetir el paso 6.1.
-    ${INTERFACE} is the network interface taking part in the negotiation of the virtual IP, e.g. eth0.
-    ${ROUTER_ID} should be the same for all keepalived cluster hosts while unique amongst all clusters in the same subnet. Many distros pre-configure its value to 51.
-    ${PRIORITY} should be higher on the control plane node than on the backups. Hence 101 and 100 respectively will suffice.
-    ${AUTH_PASS} should be the same for all keepalived cluster hosts, e.g. 42
-    ${APISERVER_VIP} is the virtual IP address negotiated between the keepalived cluster hosts.