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HP0-255 | Planning and Design of HP Integrity Mid-Range Server Solutions

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HP0-255 - Planning and Design of HP Integrity Mid-Range Server Solutions - braindump

Vendor HP
Exam Number HP0-255
Exam Name Planning and Design of HP Integrity Mid-Range Server Solutions
Questions 140 Q & A
Recent Update May 15, 2019
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Test Code : HP0-255
Test Name : Planning and Design of HP Integrity Mid-Range Server Solutions
Vendor Name : HP
Q&A : 140 Real Questions

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Planning and Design of HP Integrity Mid-Range Server Solutions book

crimson Hat business Linux Cluster Suite | HP0-255 Real Questions and VCE Practice Test

When mission-crucial applications fail, so does your enterprise. This frequently is a real commentary in latest environments, the place most businesses spend millions of bucks making their features purchasable 24/7, 12 months a yr. groups, despite no matter if they're serving exterior valued clientele or inner consumers, are deploying particularly purchasable solutions to make their functions tremendously obtainable.

In view of this starting to be demand, almost each IT vendor at the moment is proposing high-availability options for its selected platform. noted business excessive-availability solutions consist of IBM's HACMP, Veritas' Cluster Server and HP's Serviceguard.

if you are trying to find a business high-availability solution on purple Hat enterprise Linux, the most suitable option likely is the pink Hat Cluster Suite.

In early 2002, pink Hat added the first member of its pink Hat commercial enterprise Linux family unit of items, crimson Hat enterprise Linux AS (originally called crimson Hat Linux advanced Server). on account that then, the family unit of items has grown incessantly, and it now includes pink Hat business Linux ES (for entry- and mid-latitude servers) and pink Hat enterprise Linux WS (for pcs/workstations). These products are designed above all for use in business environments to deliver sophisticated software guide, performance, availability and scalability.

The usual unencumber of pink Hat business Linux AS version 2.1 covered a high-availability clustering function as a part of the bottom product. This feature become no longer covered in the smaller purple Hat commercial enterprise Linux ES product. youngsters, with the success of the red Hat business Linux household, it grew to become clear that excessive-availability clustering become a feature that should still be made available for each AS and ES server products. as a result, with the release of purple Hat business Linux edition three in October 2003, the high-availability clustering function turned into packaged into an not obligatory layered product known as the crimson Hat Cluster Suite, and it turned into licensed to be used on both the enterprise Linux AS and commercial enterprise Linux ES items.

The RHEL cluster suite is a one by one licensed product and can be bought from crimson Hat on correct of purple Hat's base ES Linux license.

purple Hat Cluster Suite Overview

The purple Hat Cluster Suite has two essential facets. One is the Cluster supervisor that offers high availability, and the different characteristic is known as IP load balancing (at the start known as Piranha). The Cluster supervisor and IP load balancing are complementary excessive-availability technologies that may also be used one at a time or in aggregate, counting on utility necessities. each of those technologies are built-in in purple Hat's Cluster Suite. listed here, I focal point on the Cluster supervisor.

desk 1 shows the predominant components of the RHEL Cluster supervisor.

desk 1. RHEL Cluster manager add-ons

utility Subsystem part goal Fence fenced provides fencing infrastructure for particular hardware structures. DLM libdlm, dlm-kernel contains disbursed lock administration (DLM) library. CMAN cman consists of the Cluster manager (CMAN), which is used for managing cluster membership, messaging and notification. GFS and related locks Lock_NoLock contains shared filesystem assist that can be set up on diverse nodes concurrently. GULM gulm contains the GULM lock management user-space tools and libraries (a substitute for using CMAN and DLM). Rgmanager clurgmgrd, clustat Manages cluster functions and resources. CCS ccsd, ccs_test and ccs_tool incorporates the cluster configuration functions dæmon (ccsd) and associated information. Cluster Configuration tool device-config-cluster includes the Cluster Configuration device, used to configure the cluster and monitor the latest status of the nodes, materials, fencing brokers and cluster features graphically. Magma magma and magma-plugins contains an interface library for cluster lock administration and required plugins. IDDEV iddev incorporates the libraries used to identify the filesystem (or quantity manager) wherein a device is formatted.

Shared Storage and statistics Integrity

Lock management is a standard cluster infrastructure provider that provides a mechanism for different cluster infrastructure add-ons to synchronize their access to shared supplies. In a pink Hat cluster, DLM (disbursed Lock supervisor) or, alternatively, GULM (Grand Unified Lock manager) are possible lock manager selections. GULM is a server-based mostly unified cluster/lock manager for GFS, GNBD and CLVM. It can be utilized in area of CMAN and DLM. A single GULM server can also be run in standalone mode but introduces a single element of failure for GFS. Three or 5 GULM servers can also be run together, in which case the failure of 1 or two servers may also be tolerated, respectively. GULM servers continually are run on dedicated machines, besides the fact that children this is no longer a strict requirement.

In my cluster implementation, I used DLM, and it runs in each and every cluster node. DLM is first rate option for small clusters (up to 2 nodes), because it eliminates quorum necessities as imposed by means of the GULM mechanism).

in keeping with DLM or GLM locking performance, there are two primary innovations that can be used by the RHEL cluster for ensuring statistics integrity in concurrent access environments. The natural manner is the use of CLVM, which works well in most RHEL cluster implementations with LVM-based mostly logical volumes.

one more technique is GFS. GFS is a cluster filesystem that allows for a cluster of nodes to entry concurrently a block gadget it really is shared among the nodes. It employs dispensed metadata and multiple journals for most suitable operation in a cluster. To keep filesystem integrity, GFS uses a lock supervisor (DLM or GULM) to coordinate I/O. When one node adjustments information on a GFS filesystem, that exchange is visible immediately to the other cluster nodes the use of that filesystem.

therefore, should you are enforcing a RHEL cluster with concurrent records entry necessities (such as, in the case of an Oracle RAC implementation), that you may use both GFS or CLVM. In most pink Hat cluster implementations, GFS is used with a right away access configuration to shared SAN from all cluster nodes. although, for the same goal, you can also install GFS in a cluster it truly is connected to a LAN with servers that use GNBD (international network Block equipment) or two iSCSI (web Small laptop equipment Interface) instruments.

both GFS and CLVM use locks from the lock supervisor. despite the fact, GFS uses locks from the lock supervisor to synchronize access to filesystem metadata (on shared storage), whereas CLVM makes use of locks from the lock manager to synchronize updates to LVM volumes and volume businesses (additionally on shared storage).

For nonconcurrent RHEL cluster implementations, that you could count on CLVM, otherwise you can use native RHEL journaling-based strategies (equivalent to ext2 and ext3). For nonconcurrent access clusters, records integrity concerns are minimal; i tried to maintain my cluster implementations elementary by using native RHEL OS thoughts.

Fencing Infrastructure

Fencing is also a crucial component of each RHEL-based cluster implementation. The main purpose of the fencing implementation is to be sure information integrity in a clustered environment.

in fact, to be sure records integrity, just one node can run a cluster service and access cluster provider statistics at a time. the use of vigour switches in the cluster hardware configuration allows a node to energy-cycle one more node earlier than restarting that node's cluster functions all the way through the failover manner. This prevents any two methods from concurrently having access to the equal information and corrupting it. it's strongly counseled that fence devices (hardware or utility solutions that remotely vigor, shut down and reboot cluster nodes) are used to assure facts integrity below all failure circumstances. software-based watchdog timers are an alternative used to ensure proper operation of cluster provider failover; however, in most RHEL cluster implementations, hardware fence contraptions are used, reminiscent of HP ILO, APC vigor switches, IBM BladeCenter devices and the Bull NovaScale Platform Administration Processor (PAP) Interface.

be aware that for RHEL cluster options with shared storage, an implementation of the fence infrastructure is a compulsory requirement.

Step-by means of-Step Implementation of a RHEL Cluster

Implementation of RHEL clusters starts with the choice of suitable hardware and connectivity. In most implementations (without IP load balancing), shared storage is used with two, or more than two, servers working the RHEL working equipment and RHEL cluster suite.

A effectively designed cluster, even if you are constructing a RHEL-primarily based cluster or an IBM HACMP-primarily based cluster, should still not comprise any single element of failure. protecting this in intellect, you have to eliminate any single point of failure out of your cluster design. For this goal, you can region your servers bodily in two separate racks with redundant energy elements. You even have to get rid of any single factor of failure from the network infrastructure used for the cluster. Ideally, be sure to have as a minimum two network adapters on each cluster node, and two community switches should still be used for building the community infrastructure for the cluster implementation.

software installing

building a RHEL cluster starts with the installing of RHEL on two cluster nodes. My setup has two HP Proliant servers (DL740) with shared fiber storage (HP MSA1000 storage). I started with a RHEL v4 installing on both nodes. it's most fulfilling to install the newest accessible working device edition and its updates. I chosen v4 replace four (which become the newest version of RHEL when i was building that cluster). when you've got a sound application subscription from pink Hat, you can log in to the pink Hat community, and go to application channels to download the latest replace purchasable. Later, when you download the ISO pictures, that you could burn it to CDs the usage of any appropriate application. throughout the RHEL OS setting up, you'll go through various configuration choices, essentially the most vital of which might be the date and time-zone configuration, the root consumer password atmosphere, firewall settings and OS safety degree selection. another crucial configuration alternative is community settings. Configuration of these settings can also be left for a later stage, especially in constructing a excessive-availability solution with Ether-channel (or Ethernet bonding configuration).

You may wish to deploy further drivers after you install the OS. In my case, I downloaded the RHEL support package for the DL740 servers (the HP Proliant assist pack, which is accessible from h18004.www1.hp.com/items/servers/linux/dl740-drivers-cert.html).

The subsequent step is installation the cluster utility package itself. This kit, once more, is obtainable from the RHEL network, and you definitely ought to choose the latest available cluster equipment. I selected rhel-cluster-2.four.0.1 for my setup, which was the newest cluster suite available at the time.

once downloaded, the package will be in tar structure. Extract it, after which deploy as a minimum the following RPMs, in order that the RHEL cluster with DLM can be put in and configured:

  • Magma and magma-plugins

  • Perl-internet-telnet

  • Rgmanager

  • gadget-config-cluster

  • DLM and dlm-kernel

  • DLM-kernel-hugemem and SMP assist for DLM

  • Iddev and ipvsadm

  • Cman, cman-smp, cman-hugemem and cman-kernelheaders

  • Ccs

  • Restart both RHEL cluster nodes after setting up vendor-related hardware support drivers and the RHEL cluster suite.

    network Configuration

    For community configuration, the most beneficial technique to proceed is to make use of the network configuration GUI. although, if you plan to make use of Ethernet channel bonding, the configuration steps are slightly diverse.

    Ethernet channel bonding enables for a fault-tolerant network connection by way of combining two Ethernet gadgets into one digital device. The ensuing channel-bonded interface ensures that if one Ethernet device fails, the other machine will develop into active. Ideally, connections from these Ethernet instruments may still go to separate Ethernet switches or hubs, in order that the single point of failure is eradicated, even on the Ethernet change and hub stage.

    To configure two community devices for channel bonding, perform the following on node 1:

    1) Create bonding devices in /etc/modules.conf. as an example, I used right here commands on each cluster node:

    alias bond0 bonding alternatives bonding miimon=a hundred mode=1

    Doing this hundreds the bonding equipment with the bond0 interface identify and passes alternate options to the bonding driver to configure it as an energetic-backup master device for the enslaved community interfaces.

    2) Edit the /etc/sysconfig/network-scripts/ifcfg-eth0 configuration file for eth0 and the /and so on/sysconfig/community-scripts/ifcfg-eth1 file for the eth1 interface, so that these data display identical contents, as shown under:

    equipment=ethx USERCTL= no ONBOOT=certaingrasp=bond0 SLAVE=convincedBOOTPROTO=none

    This enslaves ethX (replace X with the assigned variety of the Ethernet gadgets) to the bond0 master gadget.

    three) Create a network script for the bonding device (as an instance, /etc/sysconfig/network-scripts/ifcfg-bond0), which might seem like the following instance:

    equipment=bond0 USERCTL=no ONBOOT=sureBROADCAST=172.sixteen.2.255 network=172.16.2.0 NETMASK=255.255.255.0 GATEWAY=172.16.2.1 IPADDR=172.16.2.182

    4) Reboot the system for the adjustments to take impact.

    5) similarly, on node 2, repeat the equal steps with the most effective difference being that the file /and so forth/sysconfig/network-scripts/ifcfg-bond0 may still contain an IPADDR entry with the price of 172.16.2.183.

    because of these configuration steps, you'll become with two RHEL cluster nodes with IP addresses of 172.16.2.182 and 172.sixteen.2.183, which have been assigned to virtual Ethernet channels (the underlying two physical Ethernet adapters for each and every Ethernet channel).

    Now, you with ease can use the community configuration GUI on the cluster nodes to set other network configuration particulars, corresponding to hostname and primary/secondary DNS server configuration. I set Commsvr1 and Commsvr2 because the hostnames for the cluster nodes and also ensured that name resolution in both long names and short names would work high-quality from both the DNS server and the /and so on/hosts file.

    A RHEL cluster, by way of default, uses /and many others/hosts for node identify decision. The cluster node name needs to healthy the output of uname -n or the price of HOSTNAME in /etc/sysconfig/network.

    listing 1. Contents of the /and many others/hosts File on each Server

    # do not get rid of right here line, or a variety of classes # that require network performance will fail. 127.0.0.1 localhost.localdomain localhost 172.sixteen.2.182 Commsvr1 Commsvr1.kmefic.com.kw 172.16.2.183 Commsvr2 172.16.1.186 Commilo1 Commilo1.kmefic.com.kw 172.sixteen.1.187 Commilo2 Commilo2.kmefic.com.kw 172.sixteen.2.188 Commserver 192.168.10.1 node1 192.168.10.2 node2 172.16.2.four KMETSM

    in case you have an extra Ethernet interface in every cluster node, it is at all times a good suggestion to configure a separate IP community as an further network for heartbeats between cluster nodes. it is vital that the RHEL cluster uses, by way of default, eth0 on the cluster nodes for heartbeats. however, it remains feasible to make use of different interfaces for further heartbeat exchanges.

    For this classification of configuration, you effectively can use the community configuration GUI to assign IP addresses—as an example, 192.168.10.1 and 192.168.10.2 on eth2, and get it resolved from the /and so forth/hosts file.

    Setup of the Fencing equipment

    As i was the usage of HP hardware, I relied on the configuration of the HP ILO gadgets as a fencing machine for my cluster. despite the fact, you can also trust configuring other fencing gadgets, reckoning on the hardware type used in your cluster configuration.

    To configure HP ILO, you need to reboot your servers and press the F8 key to enter into the ILO configuration menus. fundamental configuration is relatively elementary; you must assign IP addresses to ILO instruments with the identify of the ILO gadget. I assigned 172.sixteen.1.one hundred with Commilo1 because the name of ILO equipment on node1, and 172.sixteen.1.a hundred and one with Commilo2 because the ILO gadget identify on node2. make sure, despite the fact, to connect Ethernet cables to the ILO adapters, which constantly are marked naturally on the back side of HP servers.

    once rebooted, which you can use the browsers in your Linux servers to entry ILO instruments. The default user identify is Administrator, with a password that continually is available on the hard-copy tag associated with the HP servers. Later, that you can change the Administrator password to a password of your choice, the usage of the equal internet-based mostly ILO administration interface.

    Setup of the Shared Storage pressure and Quorum Partitions

    In my cluster setup environment, I used an HP fiber-primarily based shared storage MSA1000. I configured a RAID-1 of 73.5GB the use of the HP wise array utility, after which assigned it to each of my cluster nodes the usage of the selective host presentation function.

    After rebooting each nodes, I used HP fiber utilities, comparable to hp_scan, in order that both servers should be able to see this array bodily.

    To check the physical availability of shared storage for each cluster nodes, seem to be within the /dev/proc/proc file for an entry like /dev/sda or /dev/sdb, based upon your environment.

    when you locate your shared storage on the OS level, partition it in keeping with your cluster storage requirements. I used the parted tool on one in every of my cluster nodes to partition the shared storage. I created two small fundamental partitions to hang raw contraptions, and a third primary partition turned into created to hold the shared facts filesystem:

    Parted> select /dev/sda Parted > mklabel /dev/sda msdos Parted > mkpart primary ext3 0 20 Parted > mkpart basic ext3 20 40 Parted > mkpart primary ext3 40 40000

    I rebooted each cluster nodes and created the /and many others/sysconfig/rawdevices file with the following contents:

    /dev/uncooked/raw1 /dev/sda1 /dev/raw/raw2 /dev/sda2

    A restart of rawdevices capabilities on both nodes will configure uncooked contraptions as quorum partitions:

    /home/root> features rawdevices restart

    I then created a JFS2 filesystem on the third primary partition the use of the mke2jfs command; youngsters, its related entry should not be put in the /and so on/fstab file on both cluster node, as this shared filesystem could be under the manage of the Rgmanager of the cluster suite:

    /domestic/root> mke2jfs -j -b 4096 /dev/sda3

    Now, that you may create a listing constitution referred to as /shared/information on both nodes and assess the accessibility of the shared filesystem from both cluster nodes via mounting that filesystem one at a time at every cluster node (mount /dev/sda3 /shared/information). besides the fact that children, on no account try to mount this filesystem on both cluster nodes simultaneously, as it could corrupt the filesystem itself.

    Cluster Configuration

    almost everything required for cluster infrastructure has been executed, so the next step is configuring the cluster itself.

    A RHEL cluster will also be configured in many methods. besides the fact that children, the easiest way to configure a RHEL cluster is to use the RHEL GUI and go to gadget administration→Cluster management→Create a cluster.

    I created a cluster with the cluster name of Commcluster, and with node names of Commsvr1 and Commsvr2. I added fencing to each nodes—fencing contraptions Commilo1 and Commilo2, respectively—in order that every node would have one fence stage with one fence machine. if in case you have multiple fence gadgets on your environment, that you could add another fence stage with greater fence instruments to every node.

    I also introduced a shared IP tackle of 172.sixteen.2.188, which might be used because the carrier IP tackle for this cluster. here's the IP tackle that also may still be used as the provider IP tackle for applications or databases (like for listener configuration, if you're going to use an Oracle database within the cluster).

    I introduced a failover domain, specifically Kmeficfailover, with priorities given in here sequence:

    Commsvr1 Commsvr2

    I added a carrier referred to as CommSvc and then put that carrier within the above-defined failover domain. The subsequent step is adding materials to this carrier. I introduced a non-public resource of the filesystem class, which has the characteristic of device=/dev/sd3, mountpoint of /shared/facts and mount class of ext3.

    I also delivered a non-public useful resource of the script classification (/root/CommS.sh) to service CommSvc. This script will start my C-based software, and therefore, it needs to be existing in the /root listing on both cluster nodes. It is terribly crucial to have relevant ownership of root and safety; otherwise, that you could expect unpredictable conduct right through cluster startup and shutdown.

    application or database startup and shutdown scripts are very essential for a RHEL-primarily based cluster to function thoroughly. RHEL clusters use the identical scripts for featuring utility/database monitoring and excessive availability, so each software script used in a RHEL cluster may still have a selected layout.

    All such scripts should still as a minimum have birth and prevent subsections, along with a standing subsection. When an software or database is attainable and working, the fame subsection of the script should return a worth of 0, and when an software is not operating or accessible, it's going to return a value of 1. The script also should still contain a restart subsection, which tries to restart functions if the application is found to be dead.

    A RHEL cluster always tries to restart the software on the identical node that became the previous proprietor of the utility, before attempting to move that utility to the different cluster node. A pattern utility script, which turned into used in my RHEL cluster implementation (to provide high availability to a legacy C-based mostly application) is shown in listing 2.

    listing 2. sample utility Script

    #Script identify: CommS.sh #Script aim: To provide utility #beginning/stop/popularity under Cluster #Script creator: Khurram Shiraz #!/bin/sh basedir=/home/kmefic/KMEFIC/CommunicationServer case $1 in 'birth') cd $basedir su kmefic -c "./CommunicationServer -f Dev-CommunicationServer.conf" exit 0 ;; 'cease') z=`ps -ef | grep Dev-CommunicationServer | grep -v "grep"| ↪awk ' print $2 ' ` if [[ $? -eq 0 ]] then kill -9 $z fuser -mk /home/kmefic exit 0 fi ;; 'restart') /root/CommunicationS.sh cease sleep 2 echo Now beginning...... /root/CommunicationS.sh beginning echo "restarted" ;; 'repute') ps -U kmefic | grep CommunicationSe 1>/dev/null if [[ $? = 0 ]] then exit 0 else exit 1 fi ;; esac

    ultimately, you ought to add a shared IP handle (172.16.2.188) to the service existing to your failover domain, so that the carrier should still contain three components: two inner most components (one filesystem and one script) and one shared aid, which is the carrier IP address for the cluster.

    The remaining step is synchronizing the cluster configuration across the cluster nodes. The RHEL cluster administration and configuration device provides a “store configuration to cluster” option, to be able to appear when you delivery the cluster capabilities. hence, for the first synchronization, it is more desirable to ship the cluster configuration file manually to all cluster nodes. You simply can use the scp command to synchronize the /etc/cluster/cluster.conf file throughout the cluster nodes:

    /home/root> scp /and so forth/cluster/cluster.conf Commsvr2:/and so forth/cluster/cluster.conf

    once synchronized, that you would be able to beginning cluster services on both cluster nodes. be sure you birth and forestall RHEL-linked cluster services, in sequence.

    To delivery:

    carrier ccsd startservice cman beginservice fenced beginservice rgmanager birth

    To stop:

    provider rgmanager stopservice fenced ceasecarrier cman stopprovider ccsd stop

    in case you use GFS, startup/shutdown of the gfs and clvmd services ought to be blanketed in this sequence.

    additional concerns

    In my ambiance, I decided not to birth cluster functions at RHEL boot time and never to close down these functions instantly when shutting down the RHEL container. besides the fact that children, in case your enterprise requires 24/7 provider availability, you can try this quite simply through the use of the chkconfig command.

    an extra consideration is logging cluster messages in a distinct log file. by means of default, all cluster messages go into the RHEL log messages file (/var/log/messages), which makes cluster troubleshooting slightly difficult in some scenarios. For this intention, I edited the /and many others/syslog.conf file to permit the cluster to log pursuits to a file this is distinct from the default log file and delivered right here line:

    daemon.* /var/log/cluster

    To observe this change, I restarted syslogd with the carrier syslog restart command. one more crucial step is to specify the time duration for rotating cluster log data. This will also be accomplished through specifying the name of the cluster log file within the /and many others/logrotate.conf file (the default is a weekly rotation):

    /var/log/messages /var/log/comfortable /var/log/maillog /var/log/spooler /var/log/boot.log /var/log/cron /var/log/cluster real endscript

    You also have to pay special consideration to holding UIDs and GIDs synchronized throughout cluster nodes. here's vital in making certain correct permissions are maintained, principally on the subject of the shared information filesystem.

    GRUB additionally needs to conform to the suite ambiance's specific needs. as an example, many system directors, in a RHEL cluster ambiance, cut back the GRUB choice timeout to a few lessen values, similar to two seconds, to accelerate system restart time.

    Database Integration with a RHEL Cluster

    The same RHEL cluster infrastructure may also be used for offering high availability to databases, corresponding to Oracle, MySQL and IBM DB2.

    the most crucial thing to bear in mind is to base your database-linked services on a shared IP handle—as an instance, you must configure Oracle listener in line with the shared provider IP tackle.

    next, I clarify, in basic steps, the way to use an already-configured RHEL cluster to provide excessive availability to a MySQL database server, which is, little question, one of the most everyday databases on RHEL.

    I expect that the MySQL-related RPMs are put in on both cluster nodes and that the RHEL cluster already is configured with a provider IP tackle of 172.16.2.188.

    Now, you easily deserve to outline a failover area using the cluster configuration tool (with the cluster node of your choice having a far better precedence). This failover area may have the MySQL carrier, which, in flip, can have two inner most substances and one shared useful resource (the service IP address).

    one of the deepest supplies may still be of the filesystem class (in my configuration, it has a mountpoint of /shared/mysqld), and the other deepest resource may still be of the script type, pointing toward the /etc/init.d/mysql.server script. The contents of this script, which should be available on both cluster nodes, is proven in checklist three on the LJ FTP web page at ftp.linuxjournal.com/pub/lj/listings/issue163/9759.tgz.

    This script units the statistics listing to /shared/mysqld/facts, which is accessible on our shared RAID array and will be attainable from both cluster nodes.

    checking out for high availability of the MySQL database can also be completed without difficulty with the support of any MySQL client. I used SQLyog, which is a home windows-primarily based MySQL client. I linked to the MySQL database on Commsvr1 after which crashed this cluster node the use of the halt command. as a result of this system crash, the RHEL cluster routine had been prompted, and the MySQL database immediately restarted on Commsvr2. This complete failover procedure took one to two minutes and took place somewhat seamlessly.

    abstract

    RHEL clustering know-how provides a respectable high-attainable infrastructure that will also be used for meeting 24/7 business requirements for databases in addition to legacy functions. probably the most important issue to bear in mind is that it is most useful to plan cautiously earlier than the specific implementation and look at various your cluster and all feasible failover eventualities entirely earlier than going live with a RHEL cluster. A smartly-documented cluster check plan can also be constructive in this regard.


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