OpenVPN watchdog which will restart the OpenVPN daemon if it decides to go away

chkhost

#!/bin/bash

IFS="`printf "\n\t"`"
set -eu
cd "`dirname "$0"`"

outfile="/dev/null"

if [[ "${1-}" == "-v" ]]; then
    outfile="/dev/stdout"
    verbose=true
    shift
fi

if [[ -z "${1-}" || "${1-}" =~ "^-" ]]; then
    echo "usage: $0 [-v] HOST"
    echo "Exits with a non-zero status if HOST is down"
    exit 1
fi

ping -W5 -c3 "$1" &> "$outfile" && true
down="$?"

if [[ ! -z "${verbose-}" ]]; then
    if [[ "$down" -ne "0" ]]; then
        msg="down"
    else
        msg="up"
    fi
    echo "$1 is $msg"
fi

exit "$down"

debian_openvpn_watchdog

#!/bin/bash

IFS="`printf "\n\t"`"
set -eu
cd "`dirname "$0"`"

chkhost="$(which chkhost 2>/dev/null || echo ./chkhost)"
server="${1-}"

if [[ -z "$server" || "$server" =~ "^-" ]]; then
    echo "usage: $0 SERVER_INTERNAL_IP"
    echo "example: $0 10.2.0.1"
    echo "most useful when added to a crontab:"
    echo "    */5 * * * * debian_openvpn_watchdog 10.2.0.1 > /dev/null"
    exit 2
fi

echo "Checking $server..."
if ! "$chkhost" -v "$server"; then
    echo "restarting openvpn..."
    /etc/init.d/openvpn restart
fi

supervisord? :D

Hey,
I have to test connectivity in a network where ping is disabled. I made a small modification to your chkhost script to test if a port is reachable (with nc), I guess it can be helpful for someone:

#!/bin/bash

IFS="`printf "\n\t"`"
set -eu
cd "`dirname "$0"`"

outfile="/dev/null"

if [[ "${1-}" == "-v" ]]; then
    outfile="/dev/stdout"
    verbose=true
    shift
fi

if [[ -z "${1-}" || "${1-}" =~ "^-" ]]; then
    echo "usage: $0 [-v] HOST PORT"
    echo "Exits with a non-zero status if PORT of HOST is reachable"
    exit 1
fi

nc -zv "$1" "$2" &> "$outfile" && true
down="$?"

if [[ ! -z "${verbose-}" ]]; then
    if [[ "$down" -ne "0" ]]; then
        msg="down"
    else
        msg="up"
    fi
    echo "$1 is $msg"
fi

exit "$down"