Keepalivedの通知ではメールが設定できるが，Slackの方が便利なのでSlack通知を設定する．

手順

ここでは，HAProxyの起動状態をチェック基準にする．

keepalived.conf

! Configuration File for keepalived
vrrp_script chk_haproxy {
    script "systemctl is-active haproxy"
}

vrrp_instance VI_1 {
    state BACKUP
    priority 50
    interface ens160
    garp_master_delay 10
    virtual_router_id 31
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass XXXXXXXX
    }
    virtual_ipaddress {
        192.168.100.10
    }
    track_script {
        chk_haproxy
    }
    notify /etc/keepalived/notify.sh
}

新たに以下のSlack通知のスクリプトを作成した．

notify.sh

#!/bin/bash

TYPE=$1
NAME=$2
STATE=$3

URL='https://hooks.slack.com/services/XXXXXX'
CHANNEL=${CHANNEL:-'#_alert'}
BOTNAME=${BOTNAME:-'keepalived-notice'}
HOSTNAME=`hostname`
MESSAGE="\`${TYPE:-'type'}\` on \`${HOSTNAME:-'host'}\` :: ${STATE:-'state'}"

payload="payload={
    \"channel\": \"${CHANNEL}\",TYPE=$1
    \"username\": \"${BOTNAME}\",
    \"text\": \"${MESSAGE}\"
}"
curl -s -S -X POST --data-urlencode "${payload}" ${URL} > /dev/null

実際にSlack通知された例を以下に示す．

参考資料

Keepalived Check and Notify Scripts

keepalivedの通知をSlackへ流す

手順

参考資料