add update sysctl setting

templates/keepalived/0/README.md

@@ -4,6 +4,7 @@ This catalog recipe enables unicast VRRP based failover for one or more floating
 
 
 ### Form Fields
+* **Update Host Sysctl** - If `true` automatically sets the needed sysctl setting on the host.
 * **Host Label Name** - Host label key name used to schedule keepalived master and backup instances.
 * **Master Label** - The value of the keepalived host Label to signify the master instance.
 * **Backup Label** - The value of the keepalived host Label to signify the backup instance.

templates/keepalived/0/docker-compose.yml.tpl

@@ -17,6 +17,9 @@ services:
       KEEPALIVED_VIRTUAL_IPADDRESS_1: "\"${virtual_ip}\""
     labels:
       io.rancher.scheduler.affinity:host_label: ${host_label}=${master_label}
+    {{- if eq .Values.update_sysctl "true" }}
+      io.rancher.sidekicks: keepalived-sysctl
+    {{- end}}
 
   keepalived-backup:
     restart: always
@@ -35,3 +38,19 @@ services:
       KEEPALIVED_VIRTUAL_IPADDRESS_1: "\"${virtual_ip}\""
     labels:
       io.rancher.scheduler.affinity:host_label: ${host_label}=${backup_label}
+    {{- if eq .Values.update_sysctl "true" }}
+      io.rancher.sidekicks: keepalived-sysctl
+    {{- end}}
+
+{{- if eq .Values.update_sysctl "true" }}
+  keepalived-sysctl:
+    image: rawmind/alpine-sysctl:0.1-1
+    network_mode: none
+    privileged: true
+    environment:
+      SYSCTL_KEY: net.ipv4.ip_nonlocal_bind
+      SYSCTL_VALUE: 1
+    labels:
+      io.rancher.container.start_once: true
+{{- end}}
+    

templates/keepalived/0/rancher-compose.yml

@@ -5,6 +5,17 @@
   minimum_rancher_version: v0.46.0
   uuid: keepalived-1
   questions:
+    - variable: "update_sysctl"
+      description: |
+        Set true to update sysctl.
+        WARN: If set to true, sysctl key net.ipv4.ip_nonlocal_bind will be set to 1.
+      label: "Update Host Sysctl:"
+      type: "enum"
+      default: "false"
+      options:
+        - "true"
+        - "false"
+      required: true
     - variable: "host_label"
       description: "Host label key name used to schedule keepalived master and backup instances."
       label: "Host Label Name:"