升级mongodb数据库2.6.6到3.0.3，切换引擎，主从同步数据

只升级mongodb的版本极为简单，更新/替换 bin/目录下的可执行文件即可。

debian和osx上的升级，按步骤来，没什么好说的。

http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian/

切换引擎就麻烦了，新引擎的性能很诱人。

对迁移引擎来说，最大的问题是文件格式不兼容

也就是说，得把旧数据全部重新导一遍。

实现方式是设旧引擎数据库为master

设新引擎数据库为slaver

执行数据同步

旧引擎库

# mongod.conf
dbpath=/hdd3/mongodb
logpath=/var/log/mongodb/mongod_audit.log
logappend=true
port = 27017
bind_ip=127.0.0.1
master=true

新引擎库

# mongod_audit_wiredtiger.conf

dbpath=/hdd3/mongodb_wiredtiger

logpath=/var/log/mongodb/mongod_audit_wiredTiger.log

logappend=true

port = 27030

bind_ip=127.0.0.1

storageEngine=wiredTiger

slave=true

source=127.0.0.1:27017

/etc/init.d/mongod_audit_wiredTiger

#!/bin/sh
#
# init.d script with LSB support.
#
# Copyright (c)  Javier Fernandez-Sanguino <jfs@debian.org>
#
# This is free software; you may redistribute it and/or modify
# it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version ,
# or (at your option) any later version.
#
# This is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License with
# the Debian operating system, in /usr/share/common-licenses/GPL;  if
# not, write to the Free Software Foundation, Inc.,  Temple Place,
# Suite , Boston, MA - USA
#
### BEGIN INIT INFO
# Provides:          mongod_audit_wiretiger
# Required-Start:    $network $local_fs $remote_fs
# Required-Stop:     $network $local_fs $remote_fs
# Should-Start:      $named
# Should-Stop:
# Default-Start:
# Default-Stop:
# Short-Description: An object/document-oriented database
# Description:       MongoDB is a high-performance, open source, schema-free
#                    document-oriented data store that's easy to deploy, manage
#                    and use. It's network accessible, written in C++ and offers
#                    the following features:
#
#                       * Collection oriented storage - easy storage of object-
#                         style data
#                       * Full index support, including on inner objects
#                       * Query profiling
#                       * Replication and fail-over support
#                       * Efficient storage of binary data including large
#                         objects (e.g. videos)
#                       * Automatic partitioning for cloud-level scalability
#
#                    High performance, scalability, and reasonable depth of
#                    functionality are the goals for the project.
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/bin/mongod
DESC=database_audit

NAME=mongod_audit_wiredtiger
# Defaults.  Can be overridden by the /etc/default/$NAME
# Other configuration options are located in $CONF file. See here for more:
# http://dochub.mongodb.org/core/configurationoptions
CONF=/etc/mongod_audit_wiredtiger.conf
PIDFILE=/var/run/$NAME.pid
ENABLE_MONGOD=yes

# Include mongodb defaults if available
if [ -f /etc/default/$NAME ] ; then
    . /etc/default/$NAME
fi

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

if test ! -x $DAEMON; then
    echo "Could not find $DAEMON"
    exit
fi

if test "x$ENABLE_MONGOD" != "xyes"; then
    exit
fi

. /lib/lsb/init-functions

STARTTIME=
DIETIME=                   # Time to wait for the server to die, in seconds
                            # If this value is set too low you might not
                            # let some servers to die gracefully and
                            # 'restart' will not work

DAEMONUSER=${DAEMONUSER:-mongodb}

set -e

running_pid() {
# Check if a given process pid's cmdline matches a given name
    pid=$
    name=$
    [ -z "$pid" ] && return
    [ ! -d /proc/$pid ] &&  return
    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n"|head -n  |cut -d : -f `
    # Is this the expected server
    [ "$cmd" != "$name" ] &&  return
    return
}

running() {
# Check if the process is running looking at /proc
# (works for all users)

    # No pidfile, probably no daemon present
    [ ! -f "$PIDFILE" ] && return
    pid=`cat $PIDFILE`
    running_pid $pid $DAEMON || return
    return
}

start_server() {
            # 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
            ulimit -m unlimited

            # In dash, ulimit takes -p for maximum user processes
            # In bash, it's -u
            if readlink /proc/$$/exe | grep -q dash
            then
                    ulimit -p
            else
                    ulimit -u
            fi

            # Start the process using the wrapper
            start-stop-daemon --background --start --quiet --pidfile $PIDFILE \
                        --make-pidfile --chuid $DAEMONUSER \
                        --exec $NUMACTL $DAEMON $DAEMON_OPTS
            errcode=$?
    return $errcode
}

stop_server() {
# Stop the process using the wrapper
            start-stop-daemon --stop --quiet --pidfile $PIDFILE \
                        --retry  \
                        --user $DAEMONUSER \
                        --exec $DAEMON
            errcode=$?
    return $errcode
}

force_stop() {
# Force the process to die killing it manually
    [ ! -e "$PIDFILE" ] && return
    if running ; then
        kill - $pid
    # Is it really dead?
        sleep "$DIETIME"s
        if running ; then
            kill - $pid
            sleep "$DIETIME"s
            if running ; then
                echo "Cannot kill $NAME (pid=$pid)!"
                exit
            fi
        fi
    fi
    rm -f $PIDFILE
}

case "$1" in
  start)
    log_daemon_msg "Starting $DESC" "$NAME"
        # Check if it's running first
        if running ;  then
            log_progress_msg "apparently already running"
            log_end_msg
            exit
        fi
        if start_server ; then
            # NOTE: Some servers might die some time after they start,
            # this code will detect this issue if STARTTIME is set
            # to a reasonable value
            [ -n "$STARTTIME" ] && sleep $STARTTIME # Wait some time
            if  running ;  then
                # It's ok, the server started and is running
                log_end_msg
            else
                # It is not running after we did start
                log_end_msg
            fi
        else
            # Either we could not start it
            log_end_msg
        fi
    ;;
  stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        if running ; then
            # Only stop the server if we see it running
            errcode=
            stop_server || errcode=$?
            log_end_msg $errcode
        else
            # If it's not running don't do anything
            log_progress_msg "apparently not running"
            log_end_msg
            exit
        fi
        ;;
  force-stop)
        # First try to stop gracefully the program
        $ stop
        if running; then
            # If it's still running try to kill it more forcefully
            log_daemon_msg "Stopping (force) $DESC" "$NAME"
            errcode=
            force_stop || errcode=$?
            log_end_msg $errcode
        fi
    ;;
  restart|force-reload)
        log_daemon_msg "Restarting $DESC" "$NAME"
        errcode=
        stop_server || errcode=$?
        # Wait some sensible amount, some server need this
        [ -n "$DIETIME" ] && sleep $DIETIME
        start_server || errcode=$?
        [ -n "$STARTTIME" ] && sleep $STARTTIME
        running || errcode=$?
        log_end_msg $errcode
    ;;
  status)

        log_daemon_msg "Checking status of $DESC" "$NAME"
        if running ;  then
            log_progress_msg "running"
            log_end_msg
        else
            log_progress_msg "apparently not running"
            log_end_msg
            exit
        fi
        ;;
  # MongoDB can't reload its configuration.
  reload)
        log_warning_msg "Reloading $NAME daemon: not implemented, as the daemon"
        log_warning_msg "cannot re-read the config file (use restart)."
        ;;

  *)
    N=/etc/init.d/$NAME
    echo "Usage: $N {start|stop|force-stop|restart|force-reload|status}" >&
    exit
    ;;
esac

exit