Logstash > Logstash. Part one. Installation.
Author: Aleksandr Chirkov
Aug. 14, 2014, 8:32 p.m.

Hi there. In this article we'll discuss about logstash's installation procedure. 

Before technical issues let's speak about our goals and strictly about logstash.

 

Image situation when you have web resource which work in production, it handles a huge amount of users. Let's say that there are thousands of users.... Each user has his own id. He could add/delete/update something via this web resource and you should know what exactly add or remove each user in some exactly time. Your web resource logs everything to syslog, for example and you have megabytes of logs. So, supposably you develope some application which should know all actions of each users and appearance of your logs looks like:

 

192.168.2.50 - - [25/Nov/2012:13:14:50 +0000] "POST /app_endpoint HTTP1.1"-" 200 "identity-client"
91.238.146.46 - - [25/Nov/2012:10:06:38 +0000] "POST /app_endpoint HTTP/1.1" 500 "identity-service"

 

Of course you could do something like that:

grep -ri "9211b9df-743b-43ef-be5a-95b5cbc70790" /var/log/my_app_log | grep POST | grep "14:50"

 

After that you will obtain a lot of messages with POST method in exactly time... after that you should do this again for next time... Some later message format may change and we will specify another filter for this message... this is wrong way....

Frankly speaking we'll not do it everytime for each user, time, loglevelel and so on...  and develop separate application for this we will no do also. Logstash will do it. Lets do it nice and quite interesting.

 

For begining lets install it and start logstash daemon.

 

1. Install JRE and download logstash jar file 

 

apt-get install -y openjdk-7-jre
mkdir /opt/logstash
wget https://download.elasticsearch.org/logstash/logstash/logstash-1.2.2-flatjar.jar -O /opt/logstash/logstash.jar

 

2. Create logstash's user

 

groupadd logstash
useradd -g  logstash logstash

 

3. Make logstash's conf dir and set permissions

 

mkdir /etc/logstash.d
chown -R logstash:logstash /opt/logstash /etc/logstash.d

 

4. Make init script for logstash

 

vi /etc/init.d/logstash

 

#! /bin/sh
### BEGIN INIT INFO
# Provides: logstash
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Default-Start: 2 3 4 5
# Default-Stop: S 0 1 6
# Short-Description: Logstash
# Description: Starts Logstash as a daemon.
### END INIT INFO

# User to run logstash server as
LOGSTASH_USER=logstash
LOGSTASH_GROUP=logstash

# Location of logstash files
LOCATION=/opt/logstash

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
DESC="Logstash Daemon"
NAME=java
DAEMON=`which java`
CONFIG_FILE="/etc/logstash.d/logstash.conf"
LOGFILE="/var/log/logstash/logstash.log"
ARGS="-Xms256m -Xmx512m -Xss256k -jar /opt/logstash/logstash.jar agent -f ${CONFIG_FILE} --log ${LOGFILE}"
SCRIPTNAME=/etc/init.d/logstash
PID="/var/run/logstash-agent.pid"

# Exit if the package is not installed
if [ ! -x "$DAEMON" ]; then
{
  echo "Couldn't find $DAEMON"
  exit 99
}
fi

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
  start-stop-daemon --start --make-pidfile --pidfile $PID --quiet --background --chuid    $LOGSTASH_USER:$LOGSTASH_GROUP -d $LOCATION --exec $DAEMON -- $ARGS \
  || return 2
}

#
# Function that stops the daemon/service
#
do_stop()
{
  # Return
  # 0 if daemon has been stopped
  # 1 if daemon was already stopped
  # 2 if daemon could not be stopped
  # other if a failure occurred
  start-stop-daemon --stop --pidfile $PID --quiet --oknodo
  RETVAL="$?"
  rm -f $PID
  return "$RETVAL"
  }

case "$1" in
  start)
    log_daemon_msg "Starting $DESC"
    do_start
    case "$?" in
      0|1) log_end_msg 0 ;;
      2) log_end_msg 1 ;;
    esac
    ;;
  stop)
    log_daemon_msg "Stopping $DESC"
    do_stop
    case "$?" in
      0|1) log_end_msg 0 ;;
      2) log_end_msg 1 ;;
    esac
    ;;
  restart)
    log_daemon_msg "Restarting $DESC"
    do_stop
    case "$?" in
      0|1)
        do_start
        case "$?" in
          0) log_end_msg 0 ;;
          1) log_end_msg 1 ;; # Old process is still running
          *) log_end_msg 1 ;; # Failed to start
        esac
        ;;
      *)
        # Failed to stop
        log_end_msg 1
        ;;
    esac
    ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|restart}" >&2
    exit 3
    ;;
esac

exit 0 

 

5. Make it executable

 

chmod +x /etc/init.d/logstash

 

6. Add symbolyc links for init

 

update-rc.d logstash defaults

 

Now you can start your logstash daemon...

 

service logstash start

 

But before it let's make possible accept logs by logstash and store parsed logs to somewhere)

Read next article. Bye.

logs
parse
install
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