Consul startup script (bootstrap server)

consul

#!/bin/bash
# chkconfig: 2345 80 05
# description: CONSUL startup script

application='consul'
run_as_user='root'
port=8300
curr_user=$(whoami)
ip=$(ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1' | grep 192)
datacenter='mrx'

echo "IP=$ip"

# stderr
echo_err() {
    echo "[ERROR] $@" 2>&1
    exit 1
}

check_user() {
    ## check if logged in as run_as_user
    if [[ ! $1 == $2 ]]
    then
        echo_err "Please login as ${2} to continue.."
    fi    
}

## check if run_as_user exists
user_exists=$(getent passwd $run_as_user)

if [ ! "${user_exists}" ];
then
    echo_err "User ${run_as_user} does not exist..exiting";
fi


get_PID() {
    PID=$(ps -ef | grep 'consul agent' | grep -v 'grep' | awk '{print $2}')
}

start() {
    
        check_user $curr_user $run_as_user
        
        echo "Starting ${application}"
        consul agent -server -bootstrap -bind=$ip -client=$ip -ui -data-dir=/opt/consul -config-dir=/etc/consul -node=$(hostname) -datacenter=$datacenter &
        #consul agent -server -bootstrap -bind=127.0.0.1 -data-dir /tmp/consul &
        # check exit status
        get_PID
        if [ "${PID}" ]
        then
            echo "${application} started on port ${port}"
            return 0
        else
            echo_err "Could not start ${application}"
        fi
}

stop() {
    
        check_user $curr_user $run_as_user
        
        echo "Shutting down $application: "
        
        get_PID
        if [ "${PID}" ]
        then
            echo $(kill ${PID})
            
            if [ $? -eq 0 ]
            then
                echo "${application} is shut down."
                return 0
            else
                echo_err "could not stop ${application}"
            fi
        fi
}

restart() {
        check_user $curr_user $run_as_user
        echo "restarting ${application}"
        stop
        start
        echo "done."
}

status(){
    get_PID
    if [ "${PID}" ]
    then
        echo "${application} is running."
        return 0
    else
        echo "${application} is NOT running."
        return 0
    fi
}


case "$1" in
  start)
        start;;
  stop)
        stop;;
  restart)
        restart;;
  status)
        status;;
  *)
        echo "Usage: $0 {start|stop|restart|status}"
esac