Download E-books Pro Linux High Availability Clustering PDF

Pro Linux excessive Availability Clustering teaches you ways to enforce this basic Linux add-on into your corporation. Linux excessive Availability Clustering is required to make sure the supply of challenge serious assets. The strategy is utilized progressively more in company datacenters world wide. whereas plenty of documentation in regards to the topic is offered on the web, it's not regularly effortless to construct a true resolution in response to that scattered details, that's frequently orientated in the direction of particular initiatives in simple terms. Pro Linux excessive Availability Clustering explains crucial high-availability clustering elements on all Linux systems, providing you with the perception to construct recommendations for any particular case needed.

In this publication 4 universal circumstances should be explained:

  • Configuring Apache for top availability
  • Creating an Open resource SAN in accordance with DRBD, iSCSI and HA clustering
  • Setting up a load-balanced internet server cluster with a back-end, highly-available database
  • Setting up a KVM virtualization platform with high-availability safety for a digital machine.

With the information you are going to achieve from those real-world functions, you can still successfully practice Linux HA on your paintings scenario with self belief.

Author Sander Van Vugt teaches Linux high-availability clustering on education classes, makes use of it in his daily paintings, and now brings this data to you in a single position, with transparent examples and instances. Make the simplest begin with HA clustering with Pro Linux excessive Availability Clustering at your side.

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103 Iface HWaddress: Iface Netdev: p1p1 21 CHAPTER 2 N CONFIGURING garage SID: 1 iSCSI Connection nation: LOGGED IN iSCSI consultation country: LOGGED_IN inner iscsid consultation country: NO switch present Portal: 192. 168. 50. 16:3260,1 continual Portal: 192. 168. 50. 121:3260,1 ********** Interface: ********** Iface identify: p1p2 Iface delivery: tcp Iface Initiatorname: iqn. 1994-05. com. redhat:33dbb91a277a Iface IPaddress: 192. 168. 50. 198 Iface HWaddress: Iface Netdev: p1p2 SID: 2 iSCSI Connection kingdom: LOGGED IN iSCSI consultation country: LOGGED_IN inner iscsid consultation country: NO switch in this server, the multipath motive force is loaded. to examine the present topology, you should use the multipath -l command. [root@apache2 ~]# multipath -l mpatha (36090a048108f574818320541fe0270b0) dm-2 EQLOGIC,100E-00 size=700G features='0' hwhandler='0' wp=rw |-+- policy='round-robin zero' prio=0 status=active | `- 7:0:0:0 sdb 8:16 lively undef working `-+- policy='round-robin zero' prio=0 status=enabled `- 8:0:0:0 sdc 8:32 energetic undef working As you will discover, a brand new machine has been created, with the identify mpatha. This equipment is created within the /dev/mapper listing at the cluster node that runs the multipath carrier. you can even see that it really is utilizing round-robin to connect with the underlying units sdb and sdc. of those, one has the prestige set to lively, and the opposite has the prestige set to enabled. At this element, the cluster node could deal with the SAN garage in the course of the /dev/mapper/mpatha equipment. If throughout the connection one of many underlying paths failed, it wouldn’t really count. The multipath driving force instantly switches to the rest equipment. /etc/multipath. conf while beginning the multipath provider, a configuration dossier is used. during this configuration dossier, assorted settings in regards to the multipath equipment may be specific. within the following directory, one can find what the contents of the dossier may well seem like: #blacklist { # wwid 26353900f02796769 # devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*" # devnode "^hd[a-z]" #} 22 CHAPTER 2 N CONFIGURING garage #multipaths { # multipath { # wwid # alias # path_grouping_policy # path_checker # path_selector # failback # rr_weight # no_path_retry # } # multipath { # wwid # alias # } #} #devices { # gadget { # seller # product # path_grouping_policy # getuid_callout # path_checker # path_selector # hardware_handler # failback # rr_weight # no_path_retry # } # machine { # seller # product # path_grouping_policy # } #} # defaults { udev_dir /dev find_multipaths sure user_friendly_names definite } 3600508b4000156d700012000000b0000 yellow multibus readsector0 "round-robin zero" handbook priorities five 1DEC_____321816758474 purple "COMPAQ" "HSV110 (C)COMPAQ" multibus "/lib/udev/scsi_id --whitelisted --device=/dev/%n" readsector0 "round-robin zero" "0" 15 priorities queue "COMPAQ" "MSA1000" multibus multipaths { multipath { wwid 36090a048108f574818320541fe0270b0 alias mpatha } } 23 CHAPTER 2 N CONFIGURING garage during this previous directory, diverse parameters are used.

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