initial create

Dockerfile

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+FROM alpine:latest
+
+# tested alpine : 3.19
+# keepalived    : https://pkgs.alpinelinux.org/package/edge/community/armhf/keepalived
+
+RUN apk update \
+    && apk upgrade \
+    && apk add --no-cache \
+        keepalived \
+        curl \
+        ca-certificates \
+    && update-ca-certificates \
+    && rm -rf /var/cache/apk/* \
+    && keepalived --version
+
+COPY keepalived.sh /etc/keepalived/keepalived.sh
+RUN chmod +x /etc/keepalived/keepalived.sh; chown root:root /etc/keepalived/keepalived.sh
+
+#CMD ["/usr/sbin/keepalived", "--dont-fork", "--dump-conf", "--vrrp", "--log-detail", "--log-console"]

docker-compose.yml

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+version: '3.5'
+
+services:
+  keepalived:
+    build: .
+    volumes:
+      - ./keepalived.conf:/etc/keepalived/keepalived.conf
+    network_mode: host
+    cap_add:
+      - NET_ADMIN
+      - NET_BROADCAST
+      - NET_RAW 

keepalived.conf

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+global_defs {
+    #Hostname will be used by default
+    router_id master_node
+    #vrrp_version                2
+    #vrrp_garp_master_delay      1
+    #vrrp_garp_master_refresh    60
+    #Uncomment the next line if you'd like to use unique multicast groups
+    #vrrp_mcast_group4 224.0.0.{{VRID}}
+    #script_user                 root
+    #enable_script_security
+}
+
+vrrp_script chk_haproxy {
+    script       "/etc/keepalived/keepalived.sh"
+    timeout 1
+    interval 1   # check every 1 second
+    fall 2       # require 2 failures for KO
+    rise 2       # require 2 successes for OK
+}
+
+vrrp_instance VI_1 {
+    state               MASTER
+    interface           eth0
+    virtual_router_id   51
+    priority            100
+    advert_int          1
+    nopreempt                           #Prevent fail-back
+
+    track_script {
+        chk_haproxy
+    }
+
+    authentication {
+        auth_type PASS
+        auth_pass 1111
+    }
+
+    virtual_ipaddress {
+        192.168.0.247
+    }
+}

keepalived.sh

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+#!/bin/bash