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  • heartbeat ¸¦ ÀÌ¿ëÇÏ¿© °í°¡¿ë¼º(High Availability ) ¼­ºñ½º ±¸ÇöÇϱâ
    ±Û¾´ÀÌ : ¹®ÅÂÁØ (2003³â 01¿ù 07ÀÏ ¿ÀÈÄ 05:14) ÀÐÀº¼ö: 11,763 [ ÆÄÀÏ ½Ã½ºÅÛ Àμâ¿ë ÆäÀÌÁö º»¹® E-Mail·Î º¸³»±â ]
    ==================================================================
    heartbeat ¸¦ ÀÌ¿ëÇÏ¿© °í°¡¿ë¼º(High Availability ) ¼­ºñ½º ±¸ÇöÇϱâ
    ==================================================================
    ÀÛ¼ºÀÏ : 2003. 1. 7
    ÀÛ¼ºÀÚ : ¹®ÅÂÁØ (http://tunelinux.pe.kr http://database.sarang.net)
    ==================================================================

    0. µé¾î°¡¸ç
    °í°¡¿ë¼ºÀ̶õ ÇϳªÀÇ ³ëµå¿¡ ¹®Á¦°¡ »ý±ä °æ¿ì ´Ù¸¥ ³ëµå¿¡¼­ ¼­ºñ½º³ª ±â´ÉÀ» ´ë½Å Á¦°øÇÏ´Â °ÍÀ» ¸»ÇÑ´Ù. ¿¹¸¦ µé¾î ¹æÈ­º®ÀÌ ÇѴ븸 ÀÖÀ» °æ¿ì ¹æÈ­º® ¼­¹ö¿¡¼­ ¹®Á¦°¡ »ý±ä °æ¿ì¿¡´Â ±× µÚ¿¡ ÀÖ´Â ¸ðµç ¼­ºñ½º°¡ ÁßÁöµÉ ¼ö ÀÖ´Ù. ¶ÇÇÑ Linux Virtual Server(LVS)¸¦ ÀÌ¿ëÇÏ¿© ·Îµå¹ë·±½ÌÀ» ÇÏ´Â °æ¿ì ¾Õ´ÜÀÇ ·Îµå¹ë·±¼­¿¡ ¹®Á¦°¡ »ý±â¸é ½ÇÁ¦ ¼­¹ö¿¡´Â ¹®Á¦°¡ ¾ø´Ù°í ÇÏ´õ¶óµµ ¸ðµç ¼­ºñ½º°¡ ÁߴܵȴÙ. ÀÌ·± °æ¿ì¸¦ À§ÇÏ¿© °¡¿ë¼ºÀ» ³ôÀ̱â À§ÇÑ ½Ã½ºÅÛ ±¸¼ºÀÌ ÇÊ¿äÇÑ °ÍÀÌ´Ù. °ø°³¼Ò½º·Î¼­ ÀÌ·¯ÇÑ ±â´ÉÀ» ±¸ÇöÇϰí ÀÖ´Â °ÍÀÌ High-Availability Linux Project ÀÌ´Ù. LVS¸¦ ÀÌ¿ëÇÏ¿© ¿©·¯´ëÀÇ ¼­¹ö¸¦ ÀÌ¿ëÇÏ¿© ºÎÇϺлêÀ» ÇÑ´Ù¸é heartbeat µîÀÇ ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© ·Îµå¹ë·±¼­¸¦ active-standby ÇüÅ·Π±¸¼ºÇÏ´Â °ÍÀÌ´Ù.

    http://www.linux-ha.org/

    ÀÌ ÇÁ·ÎÁ§Æ®¸¦ ÀÌ¿ëÇÏ¿© °í°¡¿ë¼ºÀÇ ¼­ºñ½º¸¦ ¼¼ÆÃÇÏ´Â ¹æ¹ý¿¡ ´ëÇÏ¿© ¼³¸íÇÑ´Ù.

    ȯ°æÀº ´ÙÀ½°ú °°´Ù°í °¡Á¤ÇÑ´Ù.

    °¡»ó ip : 10.10.120.61
    node 1 : 10.10.120.62 (primary)
    node 2 : 10.10.120.63 (backup)
    ±¸¼º ¼­ºñ½º : httpd (À¥¼­ºñ½º)

    ¿ÜºÎ¿¡¼­´Â 10.10.120.61(°¡»óip) ·Î ÀÎÅÍ³Ý Á¢¼ÓÀ» Çϸé primary·Î ¿¬°áÀÌ µÈ´Ù. ¸¸¾à primary¿¡ ¹®Á¦°¡ »ý±â¸é backup ¿¡¼­ fake¶ó´Â ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© °¡»ó ip¸¦ ¼³Á¤ÇÏ¿© À¥¼­ºñ½º¸¦ ´ëÄ¡ÇÏ°Ô µÇ°í primary°¡ Á¤»óÀ¸·Î µ¹¾Æ¿À¸é ´Ù½Ã primary¿¡¼­ °¡»ó ip¸¦ °¡Á®°£´Ù.

    À¥¼³Á¤Àº ¹Ì¸® µÇ¾îÀÖ´Ù°í °¡Á¤À» ÇϰڴÙ.

    1. heatbeat ¼³Ä¡
    www.linux-ha.org ¿¡¼­ ¼Ò½º³ª rpmÀ» ´Ù¿î¹Þ´Â´Ù.
    http://www.linux-ha.org/download/
    ¿©±â¼­ heartbeat package¸¦ º¸¸é ¼Ò½º, RPM, SRPMÀ¸·Î µÇ¾îÀÖ´Ù.
    heartbeat-0.4.9.2-tar.gz
    heartbeat-0.4.9.2-1.i386.rpm
    heartbeat-stonith-0.4.9.2-1.i386.rpm
    heartbeat-ldirectord-0.4.9.2-1.i386.rpm
    heartbeat-0.4.9.2-1.src.rpm

    # tar xvfz heartbeat-0.4.9.2-tar.gz
    # cd heartbeat-0.4.9.2
    # make install

    ¼Ò½º¿¡¼­ make installÀ» Çϸé ÄÄÆÄÀϰú ÇÔ²² ÀÚµ¿À¸·Î ¼³Ä¡°¡ µÈ´Ù. ¼³Ä¡´Â °£ÆíÇÑ ÆíÀÌ´Ù. make rpm À» Çϸé rpm°ú ¼Ò½º rpmÀ» »ý¼ºÇÑ´Ù(·¹µåÇÞÀÇ °æ¿ì /usr/src/redhat µð·ºÅ丮) rpmÀº ¼¼°¡Áö·Î ±¸¼ºµÇ¸ç heartbeat-stonith ÇÁ·Î±×·¥ÀÇ °æ¿ì´Â ucd-snmp ÆÐŰÁö¸¦ ÇÊ¿ä·Î ÇÑ´Ù. ¹°·Ð À§¿¡¼­ rpmÀ» ¹Þ¾Æ ¼³Ä¡ÇÒ ¼öµµ ÀÖ´Ù.

    À§¿¡¼­ heartbeat ÆÐŰÁö¸»°í ³ª¸ÓÁö µÎ°¡Áö ÆÐŰÁö´Â ¾Æ·¡ÀÇ ³»¿ëÀ» Âü°íÇÑ´Ù. stonith ¸ðµâÀº ¾ÆÁ÷ Á¤È®ÇÏ°Ô ¹«¾ùÀ» ÇÏ´Â °ÍÀÎÁö ¸ð¸£°Ú°í ldirectord´Â ¸®¾ó ¼­¹öÀÇ °¢ ¼­ºñ½º¸¦ ¸ð´ÏÅ͸µÇÏ´Â ´ë¸ó ÇÁ·Î±×·¥ÀÌ´Ù.

    # rpm -qpi heartbeat-stonith-0.4.9.2-1.i386.rpm
    The STONITH module (a.k.a. STOMITH) provides an extensible interface
    for remotely powering down a node in the cluster. The idea is quite simple:
    When the software running on one machine wants to make sure another
    machine in the cluster is not using a resource, pull the plug on the other
    machine. It's simple and reliable, albeit admittedly brutal.


    # rpm -qpi heartbeat-ldirectord-0.4.9.2-1.i386.rpm
    ldirectord is a stand-alone daemon to monitor services of real
    for virtual services provided by The Linux Virtual Server
    (http://www.linuxvirtualserver.org/). It is simple to install
    and works with the heartbeat code (http://www.linux-ha.org/).



    2. heartbeat ¼³Á¤
    heartbeat ÇÁ·Î±×·¥Àº ¼¼°¡Áö ¼³Á¤ÆÄÀÏÀ» »ç¿ëÇÑ´Ù. ¼Ò½ºÀÇ doc µð·ºÅ丮¿¡ ÀÖ´Â ¿¹Á¦ ÆÄÀÏÀ» º¹»çÇÏ¿© ¼öÁ¤Çؼ­ »ç¿ëÇÏ¸é µÈ´Ù.

    cp ¼Ò½ºµð·ºÅ丮/doc/ha.cf /etc/ha.d/
    cp ¼Ò½ºµð·ºÅ丮/doc/haresources /etc/ha.d/
    cp ¼Ò½ºµð·ºÅ丮/doc/authkey /etc/ha.d/

    ha.cf´Â primary/backup ¼­¹ö°£¿¡ ÇÊ¿äÇÑ ±âº» ¼³Á¤ÆÄÀÏÀ̸ç haresources ´Â ³ëµå°£¿¡ °øÀ¯ÇÒ ÀÚ¿ø°ú ½ºÅ©¸³Æ®¸¦ ÁöÁ¤ÇÑ´Ù. authkeys´Â ³ëµå°£ÀÇ ÀÎÁõ¹æ¹ýÀ» ÁöÁ¤ÇÑ´Ù. ¾Æ·¡¿¡¼­´Â ÇÊ¿äÇÑ ¸î°¡Áö¸¸ ¾Ë¾Æº¸°Ú´Ù. µÎ´ëÀÇ ³ëµå¿¡ ¶È°°ÀÌ ¼³Á¤À» ÇÏ¸é µÈ´Ù.

    - ha.cf
    keepalive 2 -> µÎ³ëµå°£¿¡ ¾ó¸¶³ª ÀÚÁÖ heartbeat¸¦ ÁÖ°í¹ÞÀ» °ÍÀΰ¡. 2ÃÊ
    deadtime 10 -> È£½ºÆ®°¡ Á×¾ú´Ù°¡ ÆÇ´ÜÇÏ´Â ½Ã°£. 10Ãʰ¡ Áö³ª¸é failover¸¦ ½ÃÀÛÇÑ´Ù.
    udpport 694 -> UPD heartbeat ÆÐŶÀ» º¸³¾ Æ÷Æ®
    udp eth0 -> heartbeat¸¦ º¸³¾ ÀÎÅÍÆäÀ̽º
    node linux1 -> node´Â Ŭ·¯½ºÅÍ·Î ¹­ÀÏ ½Ã½ºÅÛÀ» ÁöÁ¤ÇÑ´Ù.
    node linux2

    ¸¸¾à serial ÄÉÀ̺íÀ» ÀÌ¿ëÇÏ´Â °æ¿ì¿¡´Â ¾Æ·¡ÀÇ ¼³Á¤¶ÇÇÑ ÇÊ¿äÇÏ´Ù. ¿©±â¼­´Â eth0À» ÅëÇÏ¿© 694 udp Æ÷Æ®·Î primary¿Í backup°£¿¡ 2ÃÊ¿¡ Çѹø¾¿ heartbeat ½ÅÈ£¸¦ ÁÖ°í¹Þ°í ¸¸¾à 10Ãʵ¿¾È ¹ÝÀÀÀÌ ¾ø´Ù¸é backupÀ¸·Î ¼­ºñ½º¸¦ ³Ñ±ä´Ù°í ¼³Á¤ÇÑ °ÍÀÌ´Ù.

    serial /dev/ttyS0

    node¿¡¼­´Â À̸§ÀÌ Á¤È®ÇØ¾ß Çϴµ¥ uname -n ¸í·ÉÀ» ÀÌ¿ëÇÏ¿© ³ª¿Â À̸§À» ÀÌ¿ëÇÏ¸é µÈ´Ù.

    À§¿¡¼­´Â eth0À» ÀÌ¿ëÇÏ¿´Áö¸¸ ¼º´ÉÀ» »ý°¢ÇÏ¸é º°µµÀÇ ÀÌ´õ³Ý ÀÎÅÍÆäÀ̽º¸¦ ´õ ÀåÂøÇÏ°í º°µµÀÇ ³×Æ®¿öÅ©¸¦ ÇÒ´çÇÏ¿© ¼­ºñ½ºÇÏ´Â Âʰú Æ®·¡ÇÈÀ» ºÐ¸®½ÃŰ´Â °ÍÀÌ ÁÁÀ» °ÍÀÌ´Ù.

    - haresources
    Ŭ·¯½ºÅͰ£¿¡ °øÀ¯ÇÒ ÀÚ¿øÀ» ÁöÁ¤ÇÑ´Ù. ¿©±â¿¡¼­ À§ÀÇ 10.10.120.61À̶ó´Â °¡»ó IP¸¦ ÁöÁ¤Çϰí Ŭ·¯½ºÅÍÀÇ ÀÚ¿ø°ú °ü·ÃÇÑ ½ºÅ©¸³Æ®°¡ µé¾î°£´Ù. ¿©±â¼­´Â ¾ÆÆÄÄ¡ ½ºÅ©¸³ÅͰ¡ µÉ °ÍÀÌ´Ù. ¿©±â¼­ °¡»ó ip(10.10.120.61)´Â Àý´ë·Î ´Ù¸¥ ¼­¹öÀÇ ip·Î »ç¿ëÇÏ¸é ¾ÈµÈ´Ù. µÎ´ëÀÇ ³ëµå°£¿¡ °¡»ó ip¸¦ ÀÌ¿ëÇÏ¿© ¼­ºñ½º¸¦ ¼öÇàÇϱ⠶§¹®ÀÌ´Ù.

    linux1 10.10.120.61 httpd

    node-name resource1 resource2 ... resourceN ÇüÅ·Π±¸¼ºÀÌ µÈ´Ù. linux1ÀÌ ÁöÁ¤µÇ¾î ÀÖÀ¸¸é linux1 ³ëµå°¡ primary ³ëµå¶ó´Â °ÍÀ» ÀǹÌÇϸç backup(linux2)¿¡µµ µ¿ÀÏÇÏ°Ô ¼³Á¤À» ÇØ¾ß ÇÑ´Ù.(linux2 10.10.120.61 httpd ÀÌ·± ÇüÅ·ΠÇÏÁö ¸»¶ó´Â °ÍÀÌ´Ù)

    - authkeys
    ³ëµå°£ÀÇ ÀÎÁõ¹æ¹ýÀ» ÁöÁ¤ÇÏ¸ç ¼¼°¡Áö ÀÎÁõ ¾Ë°í¸®ÁòÀÌ Àִµ¥ crc<md5<sha1 ¼øÀ¸·Î º¸¾È¿¡ °­ÇÏÁö¸¸ ´õ ¸¹Àº ÇÁ·Î¼¼½º ÆÄ¿ö¸¦ ¿ä±¸ÇÑ´Ù.

    auth <number>
    <number> <authmethod> [<authkey>]

    ÀÌ¿Í °°Àº ÇüÅ·Π±¸¼ºÀ» ÇÑ´Ù. ¾Æ·¡´Â md5¸¦ ÀÌ¿ëÇÏ¿´´Ù.

    auth 1
    1 md5 Hello!

    authkeys¸¦ ¼³Á¤ÇÏ°í³ª¼­ ¹Ýµå½Ã chmod 600 authkeys ¸¦ ½ÇÇàÇØ¾ß ÇÑ´Ù. º¸¾È¹®Á¦¶§¹®¿¡ root¸¸ÀÌ ÀÐÀ» ¼ö ÀÖ¾î¾ß ÇÑ´Ù.


    # cat ha.cf
    logfacility local0
    keepalive 2
    deadtime 5
    initdead 60
    udpport 694
    udp eth0
    node linux1
    node linux2

    # cat haresources
    linux1 10.10.120.61 httpd

    # cat authkeys
    auth 1
    1 md5 Hello!


    3. heartbeat °¡µ¿Çϱâ
    haresources ¿¡¼­ ÁöÁ¤ÇÑ httpd ¶ó´Â ½ºÅ©¸³Æ®¸¦ /etc/ha.d/resource.d µð·ºÅ丮¿¡ µÎ¾î¾ß ÇÑ´Ù. °ü¸®»óÀÇ ÆíÀǸ¦ À§ÇÏ¿© /etc/rc.d/init.d/(redhat), /etc/init.d/httpd¸¦ ½Éº¼¸¯ ¸µÅ©ÇÏ¸é Æí¸®ÇÒ °ÍÀÌ´Ù.
    # ln -s /etc/rc.d/init.d/httpd /etc/ha.d/resource.d/httpd


    µÎ´ëÀÇ ³ëµå¿¡ À§¿Í °°Àº ¼³Á¤À» µ¿ÀÏÇÏ°Ô ÇÑ´Ù. ±×·¯°í³ª¼­ heartbeat ÇÁ·Î±×·¥À» ½ÇÇàÇÑ´Ù.
    # /etc/rc.d/init.d/heartbeat start

    °¡±ÞÀû primary ¸ÕÀú ½ÇÇàÇÏ°í³ª¼­ backupÀ» ½ÇÇàÇÏ´Â °ÍÀÌ ÁÁÀ» °ÍÀÌ´Ù.

    ha.cf ÆÄÀÏ¿¡¼­ º°µµÀÇ ·Î±×ÆÄÀÏÀ» ÁöÁ¤ÇÏÁö ¾Ê¾Ò´Ù¸é /var/log/messages ÆÄÀÏ¿¡ ·Î±×°¡ ³²´Â´Ù. ÇÁ·Î±×·¥À» ½ÇÇàÇϰí ÁßÁöÇØº¸¸é¼­ ·Î±×¸¦ °üÂûÇÏ¿©º¸ÀÚ. ±×¸®°í primary ³ëµåÀÇ ³×Æ®¿÷À» ³»¸®°Å³ª heartbeat ÇÁ·Î±×·¥À» ³»·Á¼­ backupÀ¸·Î ¼­ºñ½º°¡ ³Ñ¾î°¡´ÂÁö È®ÀÎÇÏ¿© º»´Ù. À̶ÇÇÑ ·Î±×¸¦ º¸¸é °ü·Ã ±â·ÏÀÌ ³²´Â´Ù.

    ´ÙÀ½Àº linux1¿¡¼­ °üÂûÇÑ ·Î±×ÀÌ´Ù.

    # /etc/rc.d/init.d/heartbeat stop

    Jan 6 23:33:23 linux1 heartbeat[3744]: info: Heartbeat shutdown in progress. (3744)
    Jan 6 23:33:23 linux1 heartbeat[4262]: info: Giving up all HA resources.
    Jan 6 23:33:23 linux1 heartbeat: info: Releasing resource group: linux1 10.10.120.61 httpd
    Jan 6 23:33:23 linux1 heartbeat: info: Running /etc/ha.d/resource.d/httpd stop
    Jan 6 23:33:26 linux1 httpd: httpd shutdown succeeded
    Jan 6 23:33:26 linux1 heartbeat: info: Running /etc/ha.d/resource.d/IPaddr 10.10.120.61 stop
    Jan 6 23:33:27 linux1 heartbeat: info: IP Address 10.10.120.61 released
    Jan 6 23:33:27 linux1 heartbeat[4262]: info: All HA resources relinquished.
    Jan 6 23:33:28 linux1 heartbeat[3741]: info: Heartbeat shutdown complete.


    # /etc/rc.d/init.d/heartbeat start

    Jan 6 23:34:50 linux1 heartbeat[4422]: info: **************************
    Jan 6 23:34:50 linux1 heartbeat[4422]: info: Configuration validated. Starting heartbeat 0.4.9.2
    Jan 6 23:34:50 linux1 heartbeat[4423]: info: heartbeat: version 0.4.9.2
    Jan 6 23:34:50 linux1 heartbeat[4423]: info: Heartbeat generation: 10
    Jan 6 23:34:50 linux1 heartbeat[4423]: notice: UDP heartbeat started on port 694 interface eth0
    Jan 6 23:34:50 linux1 heartbeat[4427]: info: Local status now set to: 'up'
    Jan 6 23:34:50 linux1 heartbeat[4427]: info: Heartbeat restart on node linux1
    Jan 6 23:34:50 linux1 heartbeat[4427]: info: Link linux1:eth0 up.
    Jan 6 23:34:50 linux1 heartbeat: info: Running /etc/ha.d/rc.d/ifstat ifstat
    Jan 6 23:34:52 linux1 heartbeat[4427]: info: Local status now set to: 'active'
    Jan 6 23:34:52 linux1 heartbeat[4427]: info: Heartbeat restart on node linux2
    Jan 6 23:34:52 linux1 heartbeat[4427]: info: Link linux2:eth0 up.
    Jan 6 23:34:52 linux1 heartbeat[4427]: info: Node linux2: status active
    Jan 6 23:34:52 linux1 heartbeat: info: Running /etc/ha.d/rc.d/status status
    Jan 6 23:34:52 linux1 heartbeat: info: Running /etc/ha.d/rc.d/ifstat ifstat
    Jan 6 23:34:52 linux1 heartbeat: info: Running /etc/ha.d/resource.d/IPaddr 10.10.120.61 status
    Jan 6 23:34:53 linux1 heartbeat[4433]: info: Resource acquisition completed.
    Jan 6 23:34:53 linux1 heartbeat: info: Running /etc/ha.d/rc.d/ip-request ip-request
    Jan 6 23:34:56 linux1 heartbeat: info: Running /etc/ha.d/rc.d/ip-request-resp ip-request-resp
    Jan 6 23:34:56 linux1 heartbeat: received ip-request-resp 10.10.120.61 OK
    Jan 6 23:34:56 linux1 heartbeat: info: Acquiring resource group: linux1 10.10.120.61 httpd
    Jan 6 23:34:56 linux1 heartbeat: info: Running /etc/ha.d/resource.d/IPaddr 10.10.120.61 start
    Jan 6 23:34:57 linux1 heartbeat: info: ifconfig eth0:0 10.10.120.61 netmask 255.255.0.0^Ibroadcast 10.10.255.255
    Jan 6 23:34:57 linux1 heartbeat: info: Sending Gratuitous Arp for 10.10.120.61 on eth0:0 [eth0]
    Jan 6 23:34:57 linux1 heartbeat: info: Running /etc/ha.d/resource.d/httpd start
    Jan 6 23:34:59 linux1 httpd: httpd startup succeeded
    Jan 6 23:35:03 linux1 heartbeat: info: Running /etc/ha.d/resource.d/IPaddr 10.10.120.61 status


    ´ÙÀ½Àº linux1¿¡¼­ network¸¦ ³»·ÈÀ» °æ¿ì linux2ÀÇ ·Î±× ±â·ÏÀÌ´Ù.

    Jan 6 23:38:29 linux2 heartbeat[2372]: WARN: node linux1: is dead
    Jan 6 23:38:29 linux2 heartbeat[2372]: info: Link linux1:eth0 dead.
    Jan 6 23:38:30 linux2 heartbeat: info: Running /etc/ha.d/rc.d/ifstat ifstat
    Jan 6 23:38:30 linux2 heartbeat: info: Running /etc/ha.d/rc.d/status status
    Jan 6 23:38:30 linux2 heartbeat: info: Taking over resource group 10.10.120.61
    Jan 6 23:38:30 linux2 heartbeat: info: Acquiring resource group: linux1 10.10.120.61 httpd
    Jan 6 23:38:30 linux2 heartbeat: info: Running /etc/ha.d/resource.d/IPaddr 10.10.120.61 start
    Jan 6 23:38:31 linux2 heartbeat: info: ifconfig eth0:0 10.10.120.61 netmask 255.255.0.0^Ibroadcast 10.10.255.255
    Jan 6 23:38:31 linux2 heartbeat: info: Sending Gratuitous Arp for 10.10.120.61 on eth0:0 [eth0]
    Jan 6 23:38:31 linux2 heartbeat: info: Running /etc/ha.d/resource.d/httpd start
    Jan 6 23:38:32 linux2 httpd: httpd startup succeeded
    Jan 6 23:38:32 linux2 heartbeat: info: mach_down takeover complete.


    »ý°¢º¸´Ù´Â °£´ÜÇÏ°Ô ¼³Á¤À» ÇÒ ¼ö ÀÖ´Ù.


    4. Âü°íÀÚ·á
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    High-Availability Linux Project
    http://www.linux-ha.org/

    Linux Virtual Server Project
    http://www.linuxvirtualserver.org

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    http://www-1.ibm.com/servers/esdd/articles/linux_clust/index.html

    High-Availability File Server with heartbeat
    http://www.samag.com/documents/s=1146/sam0109c/0109c.htm

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    High Availability Firewall on Linux for iSeries
    http://tunelinux.pe.kr/zboard/view.php?id=info&no=5
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    heartbeat ¸¦ ÀÌ¿ëÇÏ¿© °í°¡¿ë¼º(High Availability ) ¼­ºñ½º ±¸ÇöÇϱâ | ´äÀå: 2°³(RSS) | º»¹®¿¡ ´äÀå
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