inst-9211-lec_manual.pdf
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Contents
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5Version 1
SECTION 1 Introduction to HA Clustering in SLE11 7
SECTION 2 Install and Configure HA Clustering in SLE11 37
SECTION 3 Introduction to the Cluster Information Base 53
SECTION 4 Introduction to Cluster Resources 75
SECTION 5 Manage Clustered Storage with a SAN 95
SECTION 6 Splitbrain Avoidance and Management 111
SECTION 7 Configure Safe Logical Clusterd Storage 131
SECTION 8 Configure Active Active Clusters Storage 159
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"High Availability Clustering with the SLE HA Extension 11"
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7Version 1
Introduction to HA Clustering in SLE11
S E C T I O N 1 Introduction to HA Clustering in SLE11
Notes:
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"High Availability Clustering with the SLE HA Extension 11"
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9Version 1
Introduction to HA Clustering in SLE11
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11Version 1
Introduction to HA Clustering in SLE11
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13Version 1
Introduction to HA Clustering in SLE11
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15Version 1
Introduction to HA Clustering in SLE11
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17Version 1
Introduction to HA Clustering in SLE11
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19Version 1
Introduction to HA Clustering in SLE11
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21Version 1
Introduction to HA Clustering in SLE11
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23Version 1
Introduction to HA Clustering in SLE11
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25Version 1
Introduction to HA Clustering in SLE11
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Introduction to HA Clustering in SLE11
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29Version 1
Introduction to HA Clustering in SLE11
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
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Version 130
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
CIB = Cluster Information Base
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Version 132
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
CIB = Cluster Information Base
PE = Policy Engine
STONITH = Shoot The Other Node In The Head (Fencing daemon)
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33Version 1
Introduction to HA Clustering in SLE11
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
CIB = Cluster Information Base
PE = Policy Engine
STONITH = Shoot The Other Node In The Head (Fencing daemon)
LRM = Local Resource Manager
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Version 134
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
CIB = Cluster Information Base
PE = Policy Engine
LRM = Local Resource Manager
STONITH = Shoot The Other Node In The Head (Fencing daemon)
RA = Resource Agent
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35Version 1
Introduction to HA Clustering in SLE11
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
CIB = Cluster Information Base
PE = Policy Engine
LRM = Local Resource Manager
STONITH = Shoot The Other Node In The Head (Fencing daemon)
RA = Resource Agent
OpenAIS = Cluster membership daemon
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Version 136
Notes:
Acronyms:
CRM = Cluster Resource Manager
DC = Designated Controller (master node)
CIB = Cluster Information Base
PE = Policy Engine
STONITH = Shoot The Other Node In The Head (Fencing daemon)
LRM = Local Resource Manager
RA = Resource Agent
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37Version 1
Install and Configure HA Clustering in SLE11
S E C T I O N 2 Install and Configure HA Clustering inSLE11
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Install and Configure HA Clustering in SLE11
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Install and Configure HA Clustering in SLE11
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Install and Configure HA Clustering in SLE11
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Install and Configure HA Clustering in SLE11
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Install and Configure HA Clustering in SLE11
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Install and Configure HA Clustering in SLE11
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Install and Configure HA Clustering in SLE11
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53Version 1
Introduction to the Cluster Information Base
S E C T I O N 3 Introduction to the Cluster Information Base
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Introduction to the Cluster Information Base
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Example CIB XML from a running 2 node cluster
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57Version 1
Introduction to the Cluster Information Base
Notes:
The Cluster Information Base consists of two main parts and . The tag also contains important information about the cluster.
-Stores the cluster configuration information
-This is stored on disk so that it can be loaded into memory when the heartbeatdaemon starts
-This portion of the CIB is persistent
-Stores the current state of the cluster
-This is dynamically generated and therefore never stored on disk
-This portion of the CIB is dynamically generated.
The section contains information about the state of the cluster as known by anindividual node.
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Version 158
Notes:
The Section:
admin_epoch=
-Can be defined by the administrator to force the CIB on one node to override allother CIBs
-The CIB on the node with the highest admin_epoch will be synchronized to all othercluster nodes
epoch=
-Automatically updated after a re-election of the DC
-The epoch value on a cluster node must agree with the other cluster nodes for thatnode to have quorum
num_updates=
-Automatically updated after any change to the CIB
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59Version 1
Introduction to the Cluster Information Base
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Version 160
Notes:
The configuration section contains 4 main sections:
-contains general cluster configuration values
-if empty the defaults apply
-contains a list of cluster nodes
-contains a list of cluster resources
-contains a list of cluster resource constraints
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Introduction to the Cluster Information Base
Notes:
-contains general cluster configuration values
-if empty the defaults apply
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-contains a list of cluster nodes
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Introduction to the Cluster Information Base
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-contains a list of cluster resources
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-contains a list of cluster resource constraints
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65Version 1
Introduction to the Cluster Information Base
Notes:
The Section:
The status section contains information about the current state of the cluster. Thistypically will include entries for the nodes currently joined to the cluster as well asthe resources running on those nodes.
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The Section:
The section contains information about the current status of a clusternode
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67Version 1
Introduction to the Cluster Information Base
Notes:
The Section:
The section of the section contains entries for each resourcethat is running on that node or has run on that node.
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Introduction to the Cluster Information Base
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Version 170
Notes:
The CRM_GUI is a graphical cluster management utility.
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71Version 1
Introduction to the Cluster Information Base
Notes:
The crm_mon command is no-interactive ans does nothing more than to display thecurrent state of the cluster (nodes and resource). The default refresh time is 15seconds. This can be changed using the -i option.
Example: crm_mon -i 1 (for a 1 second refresh)
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Version 172
Notes:
The crm command has a number of sub functions that are used to manage the cluster.Here are some examples of how the crm command can be used:
Resource Management:
crm resource is used to manage cluster resources
Resource Configuration:
crm configure is used to configure cluster resources
Node Configuration:
crm node is used to configure cluster nodes
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Introduction to the Cluster Information Base
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75Version 1
Introduction to Cluster Resources
S E C T I O N 4 Introduction to Cluster Resources
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77Version 1
Introduction to Cluster Resources
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Note: stonith can also be a resource agent type but it is only used for stonith devices.
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79Version 1
Introduction to Cluster Resources
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Introduction to Cluster Resources
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LSB scripts:
-These scripts support only the start, stop, restart, reload, force-reload, and status parameters.
Example:
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Heartbeat scripts:
Example:
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83Version 1
Introduction to Cluster Resources
Notes:
OCF scripts:
-These scripts are categorized by provider (or the component with witch they are packaged)
--(providers include, heartbeat, lvm2, ocfs2, pacemaker)
-The scripts exist in subdirectories named for the respective provider, of /usr/lib/ocf/resource.d/
-These scripts allow for parameters to be passed in when the script is run. Thisenables you to define parameters for the script to operate on such as the IP addressand NIC to operate on, etc.
-To display all of the parameters that an OCF script can accept the meta-data parameter can be used when calling an OCF script from the CLI.
Example:
/usr/lib/ocf/resource.d/heartbeat/Ipaddr2 metadata
-To test if certain values will work with the script the validate-all parameter can beused when calling an OCF script from the CLI.
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-The values that are passed in from the CLI are always proceeded byOCF_RESKEY_
Example:
OCF_ROOT=/usr/lib/ocf OCF_RESKEY_ip=10.0.0.1 OCF_RESKEY_nic=eth0 /usr/lib/ocf/resource.d/heartbeat/Ipaddr2 validate-all
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Introduction to Cluster Resources
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STONITH scripts:
-These can be either scripts or binaries.
Example:
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87Version 1
Introduction to Cluster Resources
Notes:
attribute definitions:
id = Unique identifying value
class = Type of resource agent being used (i.e. ocf, lsb, heartbeat, etc.). Defineslocation
(in the file system) to start looking for the agent referenced in the type = field
type = The name of the resource agent script being called
provider = The subdirectory of the path defined by the class that contains the script
parameters are passed to the LRM
parameters are passed to the RA scripts
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Version 190
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Clone resources are an extension of primitive resources and therefor include them intheir definitions.
clone_node_max :The maximum number of instances of the resource that areallowed to run per node.
clone_max :The maximum number of instances of the resource that are allowed torun in the cluster
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Introduction to Cluster Resources
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Master/Slave resources are also an extension of primitive resources and thereforeinclude them in their definition
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95Version 1
Manage Clustered Storage with a SAN
S E C T I O N 5 Manage Clustered Storage with a SAN
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103Version 1
Manage Clustered Storage with a SAN
Notes:
Fibre channel hardware is expensive and complex to manage. SLES iSCSI lets youconsolidate storage and improve the management of your storage infrastructure onthe well known TCP/IP infrastructure. It is a lower cost, more flexible alternative tofibre channel. With SLES iSCSI, you can easily add storage and repartition existingstorage between systems and logical groupings. If one user volume is growing toorapidly, storage from another area can be allocated to it.
Some of the benefits of implementing iSCSI include
Low-cost hardware requirements
Longer distance storage connectivity
Easy-to-manage SAN solution
Scalability and flexibility
Reduced SAN management training requirements
Increased flexibility in storage management and growth
Ability to create a SAN from existing direct-attached storage servers
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111Version 1
Splitbrain Avoidance and Management
S E C T I O N 6 Splitbrain Avoidance and Management
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Notes:
Typically the STONITH action should be to power off or panic the offendingmachine. Common STONITH devices used in production are network managed
power switches and remote server administration boards (DRAC, RILO, etc.)
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123Version 1
Splitbrain Avoidance and Management
Notes:
The SBD daemons purpose is to monitor a specific part of a shared disk for a poison pill and shutdown or restart the cluster node if it is present. This shared disk, wheninitialized, will contain slots for each cluster node to monitor. The first time theSBD daemon starts on a node it will attempt to claim a slot on the SBD device.This is portion of the disk that it will monitor for poison pills.
In the SLE HAE, the openais init script will attempt to start the SBD daemon beforestarting any other part of the cluster stack. If the SBD daemon cannot start, the rest ofthe cluster stack will not start. The init script will only attempt to start the SBDdaemon if the /etc/sysconfig/sbd file exists.
The /etc/sysconfig/sbd file contains two variables:
SBD_DEVICE= (device file used as the SBD device.)
SBD_OPTS= (CLI options to pass to the SBD daemon when it is launched)
The device used as the SBD_DEVICE can be very small because each slot is nolarger than 1 disk block. It is also recommended that you refer to the SBD deice by its
persistent device name (found in /dev/disk/)
You should also enable the SBD daemon to use the watchdog device. The watchdogis used to ensure that th SBD daemon can communicate with the shared storage. If itcannot, the watchdog will fire causing the node to reboot. (For this reason you maywish to NOT have the cluster stack start automatically at boot time to avoid a possibleinfinite reboot loop if the SBD device is not accessible.)
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To enable the watchdog, you first must ensure that the appropriate wachdog kernelmodule softdog kernel module loads at boot time (common watchdog kernelmodules: softdog =generic watchdog device, hpwdt =HP hardware watchdog device,iTCO_wdt =Intel hardware watchdog device). You can do this by adding the kernelmodule to the MODULES_LOADED_ON_BOOT= line of the /etc/sysconfig/kernel
file (or by adding modprobe KERNEL_MODULE_NAME to the /etc/init.d/ boot.local file). You then need to add -W to SBD_OPTS= variable in the /etc/ sysconfig/sbd file.
If your SBD device resides on a multipath group, you may need to adjust the timeoutsSBD uses, as MPIO's path down detection can cause delays.
After the msgwait timeout, the message is assumed to have been delivered to thenode. For multipath, this should be the time required for MPIO to detect a path failureand switch to the next path. You may have to test this in your environment.
The node will perform suicide if it has not updated the watchdog timer fast enough;the watchdog timeout must be shorter than the msgwait timeout - half the value is a
good rule of thumb. To do this add the following to the SBD_OPTS= variable in the / etc/sysconfig/sbd file:
-1 -4
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125Version 1
Splitbrain Avoidance and Management
Notes:
To enable SBD fencing, once the daemon is running, you must create a STONITHcluster resource for SBD.
As with all STONITH resources, a single instance is sufficient. If the cluster nodethat is currently running the SBD resource needs to be fenced (in the case of a split-
brain), another instance of the SBD resource will be stared to perform the fencingaction (due to the node with the split-brain not being able to perform any action
because it does not have quorum).
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131Version 1
Configure Safe Logical Clusterd Storage
S E C T I O N 7 Configure Safe Logical Clusterd Storage
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159Version 1
Configure Active Active Clusters Storage
S E C T I O N 8 Configure Active Active Clusters Storage
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