MongoDB Binary Installation on Linux(Red Hat Enterprise Linux, CentOS Linux, Fedora Linux, or a related system)

MongoDB Binary Installation on Linux(Red Hat Enterprise Linux, CentOS Linux, Fedora Linux, or a related system)
                Created By : Amit Gera DBA(MongoDB & MySQL & ORACLE)
Goal:MongoDB Standard Binary Installation on Linux 64 bit through rpm package.

Partition Requirement:-
/mongo_admin:-   Will contains mongo binaries and confirguration file
/mongo_backup:- Will contains mongo backup [i.e dumpfile or export files or import files]
/mongo_data:-     Will contains data files
/mongo_home:-   Will contains profiles , scripts etc
/mongo_logs:-     Will contains log files [i.e trace ,alert & audit logfiles]

Note:-Here I have use name mongoservice_script wrt service name ,As per guidelines we must set it to meaningful name i.e product service name

Prerequisites:-http://myora-dba-notes.blogspot.com/2014/08/mongodb-distribution-formats-different.html

#~~#Step 1:-Download mogodb packages for linux
a.Create downloading destination directory
cmd:-mkdir -p /mongo_admin/mongo_binaries/download
b.Start Downloading at destination directory
If internet is available then use this cmd:-
cd /mongo_admin/mongo_binaries/download/
curl -O  http://downloads.mongodb.org/linux/mongodb-linux-x86_64-2.6.3.tgz
wget -O /mongo_admin/mongo_binaries/download/mongodb-linux-x86_64-2.6.3.tgz  http://downloads.mongodb.org/linux/mongodb-linux-x86_64-2.6.3.tgz

Else download this from other sources and copy here

#~~#Step 2:-
a.Create group and create user in that group for mongo
cmds:-
groupadd mongo_grp
useradd -r -g mongo_grp mongo_user
b.Create directory mention in below configuration file of step 6
cmds:-
mkdir -p /mongo_data/datadir/
mkdir -p /mongo_logs/error_log
chown mongo_user.mongo_grp -R /mongo_data/
chown mongo_user.mongo_grp -R /mongo_logs/
c.Create configuration & binary directories
cmds:-
mkdir -p /mongo_admin/configuration_file
touch /mongo_admin/configuration_file/mongod.conf


#~~#Step 3:-Add following below listed entries into environment file and load it in envrinoment
step a. cmd:-
echo "myadmin="/mongo_admin/"" >> /etc/environment
echo "basedir="/mongo_admin/mongo_binaries/"" >> /etc/environment
echo "myconf="/mongo_admin/configuration_file"" >> /etc/environment
echo "mongo_HOME="/mongo_home/homedir"" >> /etc/environment
echo "myadmin_download="/mongo_admin/mongo_binaries/download"" >> /etc/environment
step b. Run the file with cmd:-source /etc/environment

#~~#Step 4:- Extract binaries 
cmd:-cd $basedir
cmd:- tar zxvf $myadmin_download/mongodb-linux-x86_64-2.6.3.tgz -C /mongo_admin/mongo_binaries/
cmd:- ln -s /mongo_admin/mongo_binaries/mongodb-linux-x86_64-2.6.3 binaries

#~~#Step 5:-Add following below listed entries into environment file and load it in envrinoment
step a. cmd:-
echo "PATH="$PATH:/mongo_admin/mongo_binaries/binaries/bin"" >> /etc/environment
step b. Run the file with cmd:-source /etc/environment

#~~#Step 6: Create configuration file
a. vi /mongo_admin/configuration_file/mongod.conf
b. write below listed information into configuration file and save
# mongod.conf
#where to log
logpath=/var/log/mongodb/mongod.log
logappend=true
# fork and run in background
fork=true
port=27017
dbpath=/mongo_data/datadir

#~~#Step 7:- Now we have to initializes the mongo data directory and creates the system tables that it should contains.
cmd:-cd $basedir/binaries/bin/
cmd:- mongod --dbpath /mongo_data/datadir/

#~~#Step8: There are many ways by which we can start mongo and here we invoke mongo.server script method that use System V-style run directories (that is, /etc/init.d and run-level specific directories),
##Generally, you start the mongod server in one of these ways:
a.Invoke mongod directly. This works on any platform.
b.Invoke mongod , which also tries to determine the proper options for mongod and then runs it with those options. This script is used on Unix and Unix-like systems.
c.Invoke mongod . This script is used primarily at system startup and shutdown on systems that use System V-style run directories (that is, /etc/init.d and run-level specific directories), where it usually is installed under the name mongo. The mongo.server script starts the server by invoking mongod_safe.
d.On Mac OS X, install a separate mongo Startup Item package to enable the automatic startup of mongo on system startup. The Startup Item starts the server by invoking mongo.server.

After initializing db ,Now we are proceding to add service in System V-style run directories

Execution steps:-
-i- First create mongod service start/stop/restartup script
a. vi $basedir/binaries/bin/mongoservice_script
b. write below listed information into mongoservice_script file and save

#!/bin/bash

# mongod - Startup script for mongod

# chkconfig: 35 85 15
# description: Mongo is a scalable, document-oriented database.
# processname: mongod
# config: /etc/mongod.conf
# pidfile: /var/run/mongodb/mongod.pid

. /etc/rc.d/init.d/functions

# things from mongod.conf get there by mongod reading it


# NOTE: if you change any OPTIONS here, you get what you pay for:
# this script assumes all options are in the config file.
CONFIGFILE="/mongo_admin/configuration_file/mongod.conf"
OPTIONS=" -f $CONFIGFILE"
SYSCONFIG="/etc/sysconfig/mongod"

# FIXME: 1.9.x has a --shutdown flag that parses the config file and
# shuts down the correct running pid, but that's unavailable in 1.8
# for now.  This can go away when this script stops supporting 1.8.
DBPATH=`awk -F= '/^dbpath[[:blank:]]*=[[:blank:]]*/{print $2}' "$CONFIGFILE"`
PIDFILE=`awk -F= '/^pidfilepath[[:blank:]]*=[[:blank:]]*/{print $2}' "$CONFIGFILE"`
mongod=${MONGOD-/mongo_admin/mongo_binaries/binaries/bin/mongod}

MONGO_USER=mongo_user
MONGO_GROUP=mongo_grp

if [ -f "$SYSCONFIG" ]; then
    . "$SYSCONFIG"
fi

# Handle NUMA access to CPUs (SERVER-3574)
# This verifies the existence of numactl as well as testing that the command works
NUMACTL_ARGS="--interleave=all"
if which numactl >/dev/null 2>/dev/null && numactl $NUMACTL_ARGS ls / >/dev/null 2>/dev/null
then
    NUMACTL="numactl $NUMACTL_ARGS"
else
    NUMACTL=""
fi

start()
{
  # Recommended ulimit values for mongod or mongos
  # See http://docs.mongodb.org/manual/reference/ulimit/#recommended-settings
  #
  ulimit -f unlimited
  ulimit -t unlimited
  ulimit -v unlimited
  ulimit -n 64000
  ulimit -m unlimited
  ulimit -u 32000

  echo -n $"Starting mongod: "
  daemon --user "$MONGO_USER" "$NUMACTL $mongod $OPTIONS >/dev/null 2>&1"
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && touch /var/lock/subsys/mongod
}

stop()
{
  echo -n $"Stopping mongod: "
  killproc -p "$PIDFILE" -d 300 /usr/bin/mongod
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/mongod
}

restart () {
        stop
        start
}


RETVAL=0

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  restart|reload|force-reload)
    restart
    ;;
  condrestart)
    [ -f /var/lock/subsys/mongod ] && restart || :
    ;;
  status)
    status $mongod
    RETVAL=$?
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart}"
    RETVAL=1
esac

exit $RETVAL


-ii) Copy server script and add in system V-style run directories
cmd:-cp $basedir/binaries/bin/mongoservice_script /etc/init.d/mongoservice_script
-iii) add in chmod +x /etc/init.d/mongoservice_script

-iv) Optional if there is any old services which we need to remove :-
cmd:-chkconfig --list | grep old_mongo_servicename
if present then remove with below command
cmd:- chkconfig –del old_mongo_servicename
-v) Adding system startup for /etc/init.d/mongoservice_script ...
cmd:- chkconfig --add mongoservice_script or chkconfig mongoservice_script on

#~~#Step 9: Now you can start mongo with
/etc/init.d/mongoservice_script start
or
/etc/init.d/mongoservice_script start

Note: We can shutdown with
/etc/init.d/mongoservice_script stop
or
/etc/init.d/mongoservice_script stop