Simple Nagios Notification Handler to Send Pretty Slack Notifications

notify-slack.sh

#!/bin/bash
# Send Nagios alert to a Slack Channel.
# Add something like this to Nagios commands.cfg:
#define command {
#    command_name                    notify-host-by-slack
#    command_line                    $USER2$/notify-slack.sh HOST "$CONTACTPAGER$" "$HOSTNAME$" "$TIMET$" "$NOTIFICATIONTYPE$" "$HOSTSTATE$" "$HOSTOUTPUT$" "$LONGHOSTOUTPUT$" "$HOSTNOTESURL$"
#    register                        1
#}
#define command {
#    command_name                    notify-service-by-slack
#    command_line                    $USER2$/notify-slack.sh SERVICE "$CONTACTPAGER$" "$HOSTNAME$" "$TIMET$" $NOTIFICATIONTYPE$ $SERVICESTATE$ "$SERVICEOUTPUT$" "$LONGSERVICEOUTPUT$" "$SERVICENOTESURL$" "$SERVICEDESC$"
#    register                        1
#}
#And add something like this to your contact/template:
#host_notification_commands          notify-host-by-slack
#service_notification_commands       notify-service-by-slack
#pager                               #slack_channel_name

declare -A ICONS
ICONS[WARNING]="warning"
ICONS[CRITICAL]="x"
ICONS[OK]="white_check_mark"
ICONS[UNKNOWN]="question"
ICONS[UP]="white_check_mark"
ICONS[DOWN]="x"
ICONS[UNREACHABLE]="x"

declare -A COLORS
COLORS[WARNING]="warning"
COLORS[CRITICAL]="danger"
COLORS[OK]="good"
COLORS[UNKNOWN]="#7E01EE" #purple
COLORS[UP]="good"
COLORS[DOWN]="danger"
COLORS[UNREACHABLE]="danger"

# The hostname is added to the end of this URL.
NAGIOS_URL="https://your.server/thruk/#cgi-bin/status.cgi?host="
SLACK_URL="<fill this in>"
# Slack will re-render and cache these icons.
NAGIOS_ICON="https://pbs.twimg.com/profile_images/2652489899/01344a9dba8a62a1e5d4312b6b3afb1d_200x200.png"
RUNBOOK_ICON="https://confluence.atlassian.com/conf53/files/411109329/411174577/1/1380772449002/Confluence_appicon.png"

TYPE="${1}"
CHANNEL="${2}"
HOSTNAME="${3}"
TIME="${4}"
NOTIFICATIONTYPE="${5}"
STATE="${6}"
OUTPUT="${7}"
LONGOUTPUT=${8}
WIKI_URL="${9}"
SERVICENAME="${10}"

send_slack_msg() {
  FOOTER="<${WIKI_URL}|Runbook>"
  FOOTER_ICON="${RUNBOOK_ICON}"
  if [ -z "$WIKI_URL"]; then
    FOOTER="${TYPE} Missing Runbook"
  fi
  TEXT="${OUTPUT} \`\`\`${LONGOUTPUT}\`\`\`"
  test -z "$LONGOUTPUT" && TEXT="${OUTPUT}"

  curl -X POST "${SLACK_URL}" --data "payload={ \
    \"channel\": \"${CHANNEL}\", \
    \"attachments\": [{ \
      \"color\":       \"${COLORS[$STATE]}\", \
      \"title\":       \"${1}\", \
      \"title_link\":  \"${NAGIOS_URL}${HOSTNAME}\", \
      \"pretext\":     \":${ICONS[$STATE]}: *${NOTIFICATIONTYPE}*: <${NAGIOS_URL}${HOSTNAME}|${HOSTNAME}> \", \
      \"text\":        \"${TEXT}\", \
      \"ts\":          \"$TIME\", \
      \"footer\":      \"${FOOTER} - Nagios Time:\", \
      \"thumb_url\":   \"${NAGIOS_ICON}\", \
      \"footer_icon\": \"${FOOTER_ICON}\", \
      \"mrkdwn_in\":   [\"text\",\"pretext\"] \
    }] \
  }"
}

# Start here.
if [ "$TYPE" = "HOST" ]; then
  send_slack_msg "Host '${HOSTNAME}' is ${STATE}!"
elif [ "$TYPE" = "SERVICE" ]; then
  send_slack_msg "Service '${SERVICENAME}' is ${STATE}!"
else
  echo "This script should be used with a command in Nagios. See script comments."
  exit 1
fi