Part IX: Technical Details
Detailed background information and technical specifications.
TECHNICAL DETAILS
The default cluster stack for a Diskless Shared Root Cluster is the Red Hat Cluster Suite (RHCS). The RHCS consists of the following components:
- CMAN/DLM, Fencing, CCS for basic cluster infrastructure (configuration management, cluster membership, cluster locking, fencing)
- rgmanager for service management (application failover, monitoring, relocation)
- GFS for data storage on a shared cluster file system
- CLVM for clustered logical volume management
- Tool suite for configuration and cluster management (e.g. system-config-cluster, clustat, clusvcadm)
- LVS provides ip-loadbalancing based upon the Linux Virtual Server project
| Components |
Description |
|---|
| luci |
Remote Management System - Management Station |
| ricci |
Remote Management System - Managed Station |
| Components |
Description |
|---|
| clvmd |
The daemon that distributes LVM metadata updates around a cluster. |
| lvm |
LVM2 tools. Provides the command-line tools for LVM2. |
| system-config-lvm |
Provides graphical user interface for LVM2. |
| lvm.conf |
The LVM configuration file. The full path is /etc/lvm/lvm.conf. |
| Components |
Description |
|---|
| ccs_tool |
ccs_tool makes online updates of CCS configuration files. |
| ccs_test |
Diagnostic and testing command that is used to retrieve information from configuration files through ccsd. |
| ccsd |
CCS daemon that runs on all cluster nodes and provides configuration file data to cluster software. |
| cluster.conf |
This is the cluster configuration file. The full path is /etc/cluster/cluster.conf. |
| Components |
Description |
|---|
| cman.ko |
The kernel module for CMAN. |
| cman_tool |
Administrative front end to CMAN. It starts and stops CMAN and can change some internal parameters such as votes. |
| dlm_controld |
Daemon started by cman init script to manage dlm in kernel; not used by user. |
| gfs_controld |
Daemon started by cman init script to manage gfs in kernel; not used by user. |
| group_tool |
Used to get a list of groups related to fencing, DLM, GFS, and getting debug information. |
| groupd |
Daemon started by cman init script to interface between openais/cman and dlm_controld/gfs_controld/fenced. |
| libcman.so.<version> |
Library for programs that need to interact with cman.ko. |
| Components |
Description |
|---|
| clusvcadm |
Command used to manually enable, disable, relocate, and restart user services in a cluster |
| clustat |
Command used to display the status of the cluster, including node membership and services running. |
| clurgmgrd |
Daemon used to handle user service requests. |
| clurmtabd |
Daemon used to handle Clustered NFS mount tables |
| Components |
Description |
|---|
| fence_apc |
Fence agent for APC power switch. |
| fence_bladecenter |
Fence agent for for IBM Bladecenters with Telnet interface. |
| fence_bullpap |
Fence agent for Bull Novascale Platform Administration Processor (PAP) Interface. |
| fence_drac |
Fencing agent for Dell Remote Access Card |
| fence_ipmilan |
Fence agent for Bull Novascale Intelligent Platform Management Interface (IPMI). |
| fence_wti |
Fence agent for WTI power switch. |
| fence_brocade |
Fence agent for Brocade Fibre Channel switch. |
| fence_mcdata |
Fence agent for McData Fibre Channel switch. |
| fence_vixel |
Fence agent for Vixel Fibre Channel switch. |
| fence_sanbox2 |
Fence agent for SANBox2 Fibre Channel switch. |
| fence_ilo |
Fence agent for HP ILO interfaces (formerly fence_rib). |
| fence_rsa |
I/O Fencing agent for IBM RSA II. |
| fence_gnbd |
Fence agent used with GNBD storage. |
| fence_scsi |
I/O fencing agent for SCSI persistent reservations |
| fence_egenera |
Fence agent used with Egenera BladeFrame system. |
| fence_manual |
Fence agent for manual interaction. NOTE This component is not supported for production environments. |
| fence_ack_manual |
User interface for fence_manual agent. |
| fence_node |
A program which performs I/O fencing on a single node. |
| fence_xvm |
I/O Fencing agent for Xen virtual machines. |
| fence_xvmd |
I/O Fencing agent host for Xen virtual machines. |
| fence_tool |
A program to join and leave the fence domain. |
| fenced |
The I/O Fencing daemon. |
| Components |
Description |
|---|
| libdlm.so.version |
Library for Distributed Lock Manager (DLM) support. |
| Components |
Description |
|---|
| gfs.ko |
Kernel module that implements the GFS file system and is loaded on GFS cluster nodes. |
| gfs_fsck |
Command that repairs an unmounted GFS file system. |
| gfs_grow |
Command that grows a mounted GFS file system. |
| gfs_jadd |
Command that adds journals to a mounted GFS file system. |
| gfs_mkfs |
Command that creates a GFS file system on a storage device. |
| gfs_quota |
Command that manages quotas on a mounted GFS file system. |
| gfs_tool |
Command that configures or tunes a GFS file system. Also used to view filesystem info |
| mount.gfs |
Mount helper called by mount(8); not used by user. |
| Components |
Description |
|---|
| gnbd.ko |
Kernel module that implements the GNBD device driver on clients. |
| gnbd_export |
Command to create, export and manage GNBDs on a GNBD server. |
| gnbd_import |
Command to import and manage GNBDs on a GNBD client. |
| gnbd_serv |
A server daemon that allows a node to export local storage over the network. |
| Components |
Description |
|---|
| qdisk |
A disk-based quorum daemon for CMAN / Linux-Cluster. |
| mkqdisk |
Cluster Quorum Disk Utility |
| qdiskd |
Cluster Quorum Disk Daemon |
The following packages are essential to build a Diskless Sharedroot Cluster. You will see that with introduction of RHEL 5 there are much less packages to be installed. State: 02/2008
| Components |
Description |
|---|
| SysVinit-comoonics |
Comoonics SysVinit enhancements (killall5 can exclude processes, init can be restarted in all initlevels) |
| comoonics-cs-py |
Comoonics Clustersuite utilities and libraries written in Python |
| comoonics-bootimage-initscripts |
Comoonics Bootimage initscripts. Initscripts used by the comoonics shared root cluster environment. |
| comoonics-cdsl-py |
Comoonics cdsl utilities and library written in Python. |
| comoonics-cluster-py |
Comoonics cluster configuration utilities written in Python. |
| comoonics-pythonosfix-py |
Comoonics module to fix bug in os.path.realpath in python-2.3.4-14.4 |
| comoonics-bootimage |
Comoonics Bootimage. Scripts for creating an initrd in a gfs shared root environment. |
| Components |
Description |
|---|
| comhf-sysreport |
Workaround to get sysreports from comoonics fenceack server. |
| comoonics-backup-legato |
Comoonics Legato Backup utilities and libraries written in Python |
| comoonics-backup-py |
Comoonics Backup utilities and libraries written in Python |
| comoonics-bootimage-compat |
Files needed for the compatibility to 1.2 releases |
| comoonics-bootimage-extras-dm-multipath |
Extra listfiles for device mapper multipath sharedroot configurations |
| comoonics-bootimage-extras-iscsi |
iscsi support in the open-sharedroot cluster |
| comoonics-bootimage-extras-network |
Extra listfiles for special network configurations |
| comoonics-bootimage-extras-nfs |
Extra listfiles for nfs sharedroot configurations |
| comoonics-bootimage-extras-rdac-multipath |
Extra listfiles for rdac multipath sharedroot configurations |
| comoonics-bootimage-extras-xen |
Extra listfiles for xen support in the open-sharedroot cluster |
| comoonics-bootimage-fenceacksv |
The Fence ackserver is a service running in the fencedchroot and managing manual fenced nodes |
| comoonics-bootimage-fenceclient-ilo |
An alternative fence client for ilo cards of HP servers. Written in python. |
| comoonics-bootimage-fenceclient-ilomp |
A fence client for iloMP cards of HP inegrity servers. Written in python. |
| comoonics-bootimage-fenceclient-vmware |
Fencing for vmware client |
| comoonics-bootimage-fencemaster-vmware |
Fencing for the vmware master server |
| comoonics-bootimage-listfiles |
Comoonics Bootimage listfiles. Listfiles for mkinitrd. |
| comoonics-cmdb-py |
Comoonics Softwaremanagement CMDB utilities and libraries written in Python |
| comoonics-cs |
Comoonics Clustersuite utilities and libraries written in Python |
| comoonics-cs-rgmanager-extras |
Extras for redhats rgmanager |
| comoonics-cs-xml |
XML and DTD Files for comoonics clustersuite |
| comoonics-cs-xsl-ec |
XSL Files for comoonics enterprisecopy (com-ec) to use cloning. |
| comoonics-db-py |
Comoonics Softwaremanagement Database utilities and libraries written in Python |
| comoonics-ec-py |
Comoonics Enterprisecopy utilities and libraries written in Python |
| comoonics-fenceacksv-plugins-py |
Comoonics Fenceacksv plugins written in Python |
| comoonics-fenceacksv-py |
Comoonics Fenceacksv utilities and libraries written in Python |
| comoonics-scsi-py |
Comoonics SCSI utilities and libraries written in Python |
| comoonics-storage-hp-py |
Comoonics Enterprisecopy HP Storage utilities and libraries written in Python |
| Port |
Service |
L4-Protocol |
Relevance |
|---|
| 41966 |
rgmanager/clurgmgrd |
tcp |
|
| 41967 |
rgmanager/clurgmgrd |
tcp |
|
| 41968 |
rgmanager/clurgmgrd |
tcp |
|
| 41969 |
rgmanager/clurgmgrd |
tcp |
|
| 50006 |
ccsd |
tcp |
|
| 50007 |
ccsd |
udp |
|
| 50008 |
ccsd |
tcp |
|
| 50009 |
ccsd |
tcp |
|
| 21064 |
dlm |
tcp |
|
| 6809 |
cman |
udp |
RHEL4 and under |
| 5405 |
openais |
udp |
RHEL5 and above |
| 14567 |
gnbd |
tcp |
|
- Allows filenames up to 255 Bytes
- Stores file owner
- Supports POSIX file permissions
- Stores Last access/read timestamps
- Stores last metadata change timestamps
- Supports ACLs
- Supports extended file attributes in new versions
- Supports hard links
- Supports soft links
- Supports Block journaling
- Supports Metadata journaling
- Is case sensitive
- Is case preserving
- Uses sparse files
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