Clustered Applications with Red Hat Enterprise Linux 6
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2 Clustered Applications with Red Hat Enterprise Linux 6 Lon Hohberger - Supervisor, Software Engineering Thomas Cameron, RHCA, RHCSS, RHCDS, RHCVA, RHCX - Managing Solutions Architect Red Hat Wednesday, May 4th, 2011
3 Agenda
4 Agenda Disclaimer Red Hat and Clustering Architecture Configure the Shared Storage (iscsi Target) Configure the Shared Storage (Raw Storage) Configure the Shared Storage (iscsi Initiator) Install web server software on both nodes
5 Agenda Install the clustering software on the nodes High Availability Resilient Storage Install the cluster management software on the management server High Availability Management Connect to the web management UI Define a Cluster Create Cluster Filesystem
6 Agenda Mount point clustered vs. persistent Define the fence device Assign hosts to fence device ports Define Failover Domains Define Resources For Clustered Web Service Define Clustered Web Service Test Clustered Web Service Test Failover
7 Disclaimer This presentation was developed on Red Hat Enterprise Linux 6.1 beta. You may see slight differences in the UI between now and 6.1 release. Then again, this presentation might burst into flames, too.
8 Red Hat and Clustering
9 Red Hat and Clustering Red Hat leads the way in Open Source clustering Acquired Sistina for $31 million in early 2004, including Global Filesystem and ClusterSuite. Made the code Open Source in mid Red Hat now offers Resilient Storage (clustered filesystem - GFS2) and High Availability (high availability application services) as layered products.
10 Architecture
11 Architecture Two node cluster neuromancer.tc.redhat.com and finn.tc.redhat.com each installed neuromancer finn
12 Architecture neuromancer and finn are managed by lady3jane.tc.redhat.com also installed neuromancer finn lady3jane (conga)
13 Architecture neuromancer and finn are iscsi initators connecting to molly.tc.redhat.com, an iscsi target neuromancer (initiator) finn (initiator) lady3jane (conga) molly (target)
14 Architecture Two examples will demonstrated today Apache web server cluster Cluster of virtual machines (time permitting)
15 Configure the Shared Storage (iscsi Target)
16 Configure the Shared Storage (iscsi Target) The machine which will be the target should be subscribed to the Red Hat Enterprise Linux Server (v. 6 for [arch]) on RHN or RHN Satellite
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18 Configure the Shared Storage (iscsi Target) Install the Network Storage Server (storage-server) group using yum
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21 Configure the Shared Storage (Raw Storage)
22 Configure the Shared Storage (Raw Storage) In this example, we'll use set up a logical volume on molly. fdisk pvcreate vgcreate lvcreate
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28 Configure the Shared Storage (iscsi Target)
29 Configure the Shared Storage (iscsi Target) In this example, we'll set up molly as an iscsi target /etc/tgtd/targets.conf
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31 Configure the Shared Storage (iscsi Target) chkconfig tgtd on service tgtd restart tgtadm --lld iscsi --mode target --op show
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34 Configure the Shared Storage (iscsi Initiator)
35 Configure the Shared Storage (iscsi Initiator) Subscribe the server to the High Availability and Resilient Storage child channel for RHEL Server
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37 Configure the Shared Storage (iscsi Initiator) Install the iscsi Storage Client group
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39 Configure the Shared Storage (iscsi Initiator) chkconfig on and restart the iscsid (first) and iscsi services
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41 Configure the Shared Storage (iscsi Initiator) Use iscsiadm to query the target (use the ip address, not the domain name)
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43 Configure the Shared Storage (iscsi Initiator) Use iscsiadm to log in (use the ip address, not the domain name)
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45 Configure the Shared Storage (iscsi Initiator) Verify there is a new block device available
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47 Configure the Shared Storage (iscsi Initiator) Repeat these steps on the other node(s)
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49 Configure the Shared Storage (iscsi Initiator) We'll create the filesystem later, after the cluster is defined
50 Install web server software on both nodes
51 Install web server software on both nodes yum groupinstall Web Server Verify httpd is chkconfig'd off (we'll let the cluster manage it), later Set the Listen address to the IP address we're going to run the clustered web server on (armitage.tc.redhat.com or )
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53
54 Install the clustering software on the nodes
55 Install the clustering software on the nodes There are two components of the cluster High availability application service ( High Availability package group) Clustered filesystem (GFS2, or Resilient Storage package group)
56 Install the clustering software on the nodes Install the High Availability group first yum groupinstall High Availability
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58 Install the clustering software on the nodes chkconfig ricci on passwd ricci service ricci start
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60 Install the clustering software on the nodes Install the Resilient Storage package group next yum groupinstall Resilient Storage
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62 Install the cluster management software on the management server
63 Install the cluster management software on the management server Install the High Availability Management package group yum groupinstall High Availability Management
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66 Install the cluster management software on the management server chkconfig luci on service luci start Open the URL listed when luci starts (
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68 Connect to the web management UI
69 Connect to the web management UI You will get an SSL warning, that's expected and normal
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73 Define a Cluster
74 Define a Cluster In this case, two nodes neuromancer.tc.redhat.com finn.tc.redhat.com
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77 Connect to the web management UI Note that when dealing with RHEL 6.1 clusters, the UI is asking for ricci's password, not root's!
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82 Create Cluster Filesystem
83 Create Cluster Filesystem Now that the cluster is up, we can set up the shared storage from the hosts. Verify each node is using clustered logical volumes
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85 Create Cluster Filesystem From a node: fdisk shared storage pvcreate vgcreate vgscan on all nodes vgdisplay to get extents lvcreate lvscan on all nodes mkfs.gfs2 make mount persistent (optional)
86 Create Cluster Filesystem Mount point clustered vs. persistent
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96 Define the fence device
97 Define the fence device In this case, a WTI IPS-800 remote power switch
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101 Assign hosts to fence device ports
102 Assign hosts to fence device ports Define the power port for each server
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109 Define Failover Domains
110 Define Failover Domains prefer_neuromancer prefer_finn
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114 Define Resources For Clustered Web Service
115 Define Resources For Clustered Web Service Shared Storage (if not in fstab) IP address Apache Resource
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123 Define Clustered Web Service
124 Define Clustered Web Service Define service Add storage resource (if not in fstab) Add ip address resource add script resource
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140 Test Clustered Web Service From the web UI From the command line
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145 Test Failover Crash the app several times Crash the server
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154 Questions?
155 Thank You! If you liked today's presentation, please let us know! Lon's contact info: Thomas's contact info: choirboy on #rhel on Freenode thomasdcameron on Twitter
156 Additional Resources RHEL 6.1 Beta Clustering Guide RH436: Red Hat Enterprise Clustering and Storage Management Red Hat Cluster Wiki Red Hat Mailing Lists
157
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