Setup scripts added

scripts/setup_keepalived.sh

@@ -0,0 +1,113 @@
+#!/bin/bash
+#
+# Keepalived Setup Script for 5-Node Docker Cluster
+# VIP: 140.44.4.70
+# Nodes: 140.44.4.71 - 140.44.4.75
+#
+# Usage: sudo bash setup_keepalived.sh
+#
+
+set -euo pipefail
+
+log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*"; }
+
+if [ "$(id -u)" -ne 0 ]; then
+    log "ERROR: This script must be run as root (use sudo)."
+    exit 1
+fi
+
+VIP="140.44.4.70"
+VIP_CIDR="24"
+ROUTER_ID="70"
+AUTH_PASS="DockerHA123!"
+
+log "Detecting primary network interface and IP..."
+# Find interface with default route to the gateway (140.44.4.1)
+IFACE=$(ip route | awk '/default/ {print $5}' | head -n1)
+if [ -z "$IFACE" ]; then
+    log "ERROR: Could not detect default network interface."
+    exit 1
+fi
+
+# Find IP of that interface
+MY_IP=$(ip -4 addr show dev "$IFACE" | awk '/inet / {print $2}' | cut -d/ -f1)
+if [ -z "$MY_IP" ]; then
+    log "ERROR: Could not detect IP address for interface $IFACE."
+    exit 1
+fi
+
+log "Detected IP: $MY_IP on interface: $IFACE"
+
+# Validate IP and determine priority
+case "$MY_IP" in
+    140.44.4.71) PRIORITY=150; STATE="MASTER" ;;
+    140.44.4.72) PRIORITY=140; STATE="BACKUP" ;;
+    140.44.4.73) PRIORITY=130; STATE="BACKUP" ;;
+    140.44.4.74) PRIORITY=120; STATE="BACKUP" ;;
+    140.44.4.75) PRIORITY=110; STATE="BACKUP" ;;
+    *)
+        log "ERROR: This IP ($MY_IP) is not part of the expected cluster (140.44.4.71-75)."
+        exit 1
+        ;;
+esac
+
+log "Installing keepalived..."
+if command -v apt-get &> /dev/null; then
+    apt-get update -y && apt-get install -y keepalived
+elif command -v dnf &> /dev/null; then
+    dnf install -y keepalived
+elif command -v yum &> /dev/null; then
+    yum install -y keepalived
+else
+    log "ERROR: Unsupported package manager. Please install keepalived manually."
+    exit 1
+fi
+
+log "Configuring keepalived (State: $STATE, Priority: $PRIORITY)..."
+
+# Create a health check script for Docker
+mkdir -p /etc/keepalived/scripts
+cat << 'EOF' > /etc/keepalived/scripts/check_docker.sh
+#!/bin/bash
+# Returns 0 if docker is active, 1 if it is stopped/crashed
+systemctl is-active --quiet docker
+EOF
+chmod +x /etc/keepalived/scripts/check_docker.sh
+
+# Backup existing config if any
+[ -f /etc/keepalived/keepalived.conf ] && mv /etc/keepalived/keepalived.conf "/etc/keepalived/keepalived.conf.bak.$(date +%s)"
+
+# Create new config
+cat << EOF > /etc/keepalived/keepalived.conf
+vrrp_script chk_docker {
+    script "/etc/keepalived/scripts/check_docker.sh"
+    interval 2
+    weight -20
+}
+
+vrrp_instance VI_1 {
+    state $STATE
+    interface $IFACE
+    virtual_router_id $ROUTER_ID
+    priority $PRIORITY
+    advert_int 1
+    authentication {
+        auth_type PASS
+        auth_pass $AUTH_PASS
+    }
+    virtual_ipaddress {
+        $VIP/$VIP_CIDR dev $IFACE
+    }
+    track_script {
+        chk_docker
+    }
+}
+EOF
+
+log "Restarting and enabling keepalived service..."
+systemctl enable keepalived
+systemctl restart keepalived
+
+log "=== Keepalived setup complete on $MY_IP ==="
+log "Check status with: systemctl status keepalived"
+log "Virtual IP $VIP will be active on the node with the highest priority."