User manual REDHAT CLUSTER MANAGER INSTALLATION AND ADMINISTRATION GUIDE

[. . . ] Red Hat Cluster Manager The Red Hat Cluster Manager Installation and Administration Guide ISBN: N/A Red Hat, Inc. 1801 Varsity Drive Raleigh, NC 27606 USA +1 919 754 3700 (Voice) +1 919 754 3701 (FAX) 888 733 4281 (Voice) P. O. Box 13588 Research Triangle Park, NC 27709 USA © 2002 Red Hat, Inc. © 2000 Mission Critical Linux, Inc. [. . . ] -ne 0 ]; then ERRORFOUND=${TRUE?} fi done 18. Edit the inittab file and comment out the DB2 line to enable the cluster service to handle starting and stopping the DB2 service. This is usually the last line in the file. For example: # db:234:once:/etc/rc. db2 > /dev/console 2>&1 # Autostart DB2 Services Use the cluadmin utility to create the DB2 service. Add the IP address from Step 1, the shared partition created in Step 2, and the start/stop script created in Step 16. To install the DB2 client on a third system, invoke these commands: display# mount -t iso9660 /dev/cdrom /mnt/cdrom display# cd /mnt/cdrom/IBM/DB2 display# . /db2setup -d -r /root/db2client. rsp To configure a DB2 client, add the service's IP address to the /etc/hosts file on the client system: 10. 1. 16. 182 ibmdb2. lowell. mclinux. com ibmdb2 Then, add the following entry to the /etc/services file on the client system: db2cdb2inst1 50000/tcp Invoke the following commands on the client system: # # # # # su - db2inst1 db2 catalog tcpip node ibmdb2 remote ibmdb2 server db2cdb2inst1 db2 catalog database sample as db2 at node ibmdb2 db2 list node directory db2 list database directory Section 5. 4:Setting Up a DB2 Service 101 To test the database from the DB2 client system, invoke the following commands: # db2 connect to db2 user db2inst1 using ibmdb2 # db2 select tabname from syscat. tables # db2 connect reset 102 Chapter 5:Database Services Section 6. 1:Setting Up an NFS Service 103 6 Network File Sharing Services This chapter contains instructions for configuring Red Hat Linux Advanced Server to make network file sharing services through NFS and Samba highly available. 6. 1 Setting Up an NFS Service A highly available network filesystem (NFS) are one of the key strengths of the clustering infrastructure. Advantages of clustered NFS services include: · · · Ensures that NFS clients maintain uninterrupted access to key data in the event of server failure. Facilitates planned maintenance by allowing transparent relocation of NFS services to one cluster member, allowing an administrator to fix or upgrade the other cluster member. Allows setup of an active-active configuration to maximize equipment utilization. More details on active-active configurations appear later in this chapter. 6. 1. 1 NFS Server Requirements In order to create highly available NFS services, there are a few requirements which must be met by each cluster server. (Note: these requirements do not pertain to NFS client systems. ) These requirements are as follows: · · Kernel support for the NFS server must be enabled. NFS can be either configured statically or as a module. The kernel support for NFS provided with Red Hat Linux Advanced Server 2. 1 incorporates enhancements (initially developed by Mission Critical Linux Inc. ) which allow for transparent relocation of NFS services. These kernel enhancements prevent NFS clients from receiving Stale file handle errors after an NFS service has been relocated. If using kernel sources that do not include these NFS enhancements, then NFS can still be configured and run within the cluster; but warning messages will appear during service start and stop pointing out the absence of these kernel enhancements. The NFS daemons must be running on all cluster servers. This is accomplished by enabling the NFS init. d run level script. For example: /sbin/chkconfig --level 345 nfs on · · The RPC portmap daemon must be enabled. For example: /sbin/chkconfig --level 345 portmap on 104 Chapter 6:Network File Sharing Services NFS services will not start unless the following NFS daemons are running: nfsd, rpc. mountd, and rpc. statd. · Filesystem mounts and their associated exports for clustered NFS services should not be included in /etc/fstab or /etc/exports. Rather, for clustered NFS services, the parameters describing mounts and exports are entered via the cluadmin configuration utility. 6. 1. 2 Gathering NFS Service Configuration Parameters In preparation of configuring NFS services, it is important to plan how the filesystems will be exported and failed over. The following information is required in order to configure NFS services: · · · Service Name -- A name used to uniquely identify this service within the cluster. [. . . ] 171 software watchdog timers . . . . . . . . . . . . . . 65 syslog event logging configuring . . . . . . . . . . 65 system monitoring daemon . . . . . . . . . . . . 132 T tables availability and data integrity . . . . . . . [. . . ]