haproxy reloader

reload_haproxy.sh

#!/bin/bash

haproxy_bin="/usr/sbin/haproxy"
haproxy_config="/etc/haproxy/haproxy.cfg"
haproxy_tmp_config=$(mktemp --tmpdir haproxy_config_XXXX)
haproxy_pidfile="/run/haproxy.pid"
haproxy_temp_pidfile="/run/haproxy-reloader-${BASHPID}.pid"

EXTRAOPTS=

if [ -e /etc/default/haproxy ]; then
        . /etc/default/haproxy
fi

[ -f /etc/default/rcS ] && . /etc/default/rcS
. /lib/lsb/init-functions

log_daemon_msg "Starting reload script at $(date -R)"

(( acquireloops = 5 ))
while (( acquireloops > 0 )); do
    log_daemon_msg "Moving pidfile"
    mv $haproxy_pidfile $haproxy_temp_pidfile
    if [[ $? -ne 0 ]]; then
        (( acquireloops -= 1 ))
        log_daemon_msg "Reload in progress or haproxy not running, retrying in one second"
        sleep 1
    else
        log_daemon_msg "Acquired pidfile"
        break
    fi
done
if (( acquireloops == 0 )); then
    log_daemon_msg "Error getting pid file"
    log_end_msg 3
    exit 3
fi

(( configloops = 5 ))
while (( configloops > 0 )); do
    log_daemon_msg "Copying and checking config"

    cp $haproxy_config $haproxy_tmp_config
    $haproxy_bin -c -f "$haproxy_tmp_config" >/dev/null
    if [[ $? -eq 1 ]]; then
        (( configloops -= 1 ))
        log_daemon_msg "Error in haproxy config, looping"
        sleep 1
    else
        log_daemon_msg "Got valid haproxy config"
        break
    fi
done
if (( configloops == 0 )); then
    log_daemon_msg "Error getting valid config; moving pidfile back"
    mv $haproxy_temp_pidfile $haproxy_pidfile
    log_end_msg 4
    exit 4
fi

log_daemon_msg "Reloading haproxy"
$haproxy_bin -f "$haproxy_tmp_config" -p $haproxy_temp_pidfile -D $EXTRAOPTS -sf $(cat $haproxy_temp_pidfile)
if [[ $? -ne 0 ]]; then
    log_daemon_msg "Error reloading haproxy"
    log_end_msg 2
    exit 2
fi

# Give haproxy time to actually read the pid file before moving it
sleep 1

log_daemon_msg "Moving pidfile back"
mv $haproxy_temp_pidfile $haproxy_pidfile
if [[ $? -ne 0 ]]; then
    log_daemon_msg "Error moving pidfile back"
    log_end_msg 3
    exit 3
fi

log_end_msg 0
exit 0