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42 The Virtualization Cookbook for Red Hat Enterprise Linux 5.2
4.4 Customizing the SYSTEM CONFIG file
The first configuration file read when z/VM IPLs is the SYSTEM CONFIG file. The following
changes are recommended:
Change the system name.
Increase retrieve key capacity.
Allow virtual disks (VDISKs) to be created.
Turn off the Disconnect Timeout. This will prevent idle disconnected users from being
forced off the system.
Define a virtual switch (VSWITCH) that will be used for Linux networking.
To make these changes, perform the following steps:
1. To edit the SYSTEM CONFIG file, the MAINT CF1 minidisk must be released as a CP disk
using the CPRELASE command. The CP disks are queried using the QUERY CPDISK command.
Note the MAINT CF1 disk is accessed as CP disk A before it is released, but not after.
==> q cpdisk
Label Userid Vdev Mode Stat Vol-ID Rdev Type StartLoc EndLoc
MNTCF1 MAINT 0CF1 A R/O 540RES D850 CKD 39 158
MNTCF2 MAINT 0CF2 B R/O 540RES D850 CKD 159 278
MNTCF3 MAINT 0CF3 C R/O 540RES D850 CKD 279 398
==> cprel a
CPRELEASE request for disk A scheduled.
HCPZAC6730I CPRELEASE request for disk A completed.
==> q cpdisk
Label Userid Vdev Mode Stat Vol-ID Rdev Type StartLoc EndLoc
MNTCF2 MAINT 0CF2 B R/O 540RES D850 CKD 159 278
MNTCF3 MAINT 0CF3 C R/O 540RES D850 CKD 279 398
2. After it is released, you are able to access the MAINT CF1 disk read-write. Use the LINK
command with multi-read (MR) parameter and ACCESS command to get read-write access
as your F disk.
==> link * cf1 cf1 mr
==> acc cf1 f
3. Make a backup copy of the vanilla SYSTEM CONFIG file using the COPYFILE command with the
OLDDATE parameter so that the time stamp of the file is not modified. Note that because the
target file name (system) and mode (f) are the same, the equal sign (=) can be used as a
wildcard.
==> copy system config f = conforig = (oldd
4. Edit the original file:
==> x system config f
5. The system name is set to ZVMV5R40 by default in the System_Identifier_Default
statement. You can search for it using the / subcommand:
====> /System_Identifier_D
Modify this to the new name of your system. In this example, VMLINUXA is used.
System_Identifier_Default <VMLINUXA>
6. Next look for the Features statement. You can search for it again or you can use F8 to page
down. The following changes and additions are recommended:
– Increase the number of commands that can be retrieved from 20 to 99.
– Set the Disconnect_Timeout to off so disconnected users do not get forced off.
– Allow unlimited VDISKs to be created by users by changing Userlim to infinite and
by adding the Syslim infinite clause, as shown here:
- The Virtualization Cookbook 1
- Linux 5.2 3
- October 2008 3
- First Edition (October 2008) 4
- Contents 5
- Contents v 7
- Contents vii 9
- Trademarks 12
- The team that wrote this book 13
- Chapters and appendixes 15
- Conventions 17
- Comments welcome 17
- 1.1 What is virtualization 20
- 1.2 This book’s approach 21
- 1.4 Infrastructure design 22
- Planning 25
- 2.1 Bill of materials 26
- 2.2 z/VM conventions 27
- 2.3 Disk planning 28
- DASD versus SCSI/FCP 29
- 3390-3s versus 3390-9s 29
- Disk storage per Linux image 29
- 2.4 Memory planning 30
- 2.5 Password planning 30
- 2.6 Planning worksheets 31
- 2.7 Blank worksheets 34
- 2.7.2 z/VM DASD worksheet 35
- Configuring a desktop machine 37
- Figure 3-2 Setting logging 39
- Saving sessions 41
- 3.2 Setting up a VNC client 42
- 3.3 3270 emulators 43
- 4.1 Installing z/VM from DVD 46
- ==> instplan 50
- Running INSTDVD 52
- Figure 4-8 Load window 53
- ==> cold drain noautolog 54
- ==> no 54
- ==> disc 54
- 4.2 Configuring TCP/IP 56
- not specified 62
- 4.6 Adding paging volumes 65
- Using the CPFORMAT EXEC 67
- 4.6.4 Testing the changes 71
- 4.8.2 Testing the changes 78
- 4.9.1 VM security products 79
- ==> sampnss cms 86
- Servicing z/VM 89
- 5.1 Applying a PTF 90
- 6.4 Enabling the NFS server 106
- 7.2.3 Configuring VDISK swap 128
- 7.2.4 Configuring yum 128
- 7.2.5 Adding additional RPMs 129
- 7.2.10 Configuring SSH keys 134
- 4 6763) is running 135
- 8.2.4 Adding additional RPMs 145
- 8.2.8 Configuring SSH keys 145
- 8.2.9 Rebooting the system 146
- 8.2.10 Verifying the changes 146
- Detach the source disks 151
- Detach the target disks 154
- IPL the target system 154
- 9.3.2 Using the clone script 157
- FLASHCOPY 159
- Installation Server 159
- Master Image 159
- 9.5 Reviewing system status 163
- LNXMAINT 164
- Delete these 167
- Servicing Linux with Red Hat 171
- 12.1.2 Testing Apache 179
- 12.1.3 Turning on a firewall 179
- 12.1.6 Apache resources 182
- Start the LDAP service 184
- Deleting duplicate users 186
- Set a password 189
- 12.3.4 Adding a Samba user 191
- 12.3.6 Testing your changes 192
- 12.3.7 Configuring printing 193
- 12.4.1 Additional resources 194
- Linux kernel development 195
- Web development 195
- Miscellaneous recipes 197
- 13.1 Adding a logical volume 198
- Volume Group - optvg 200
- Creating a physical volume 204
- Extending the volume group 204
- /var/lib/ldap 205
- Configuring LDAP 206
- Configuring automount 207
- 13.4 Rescuing a Linux system 208
- Monitoring z/VM and Linux 211
- INIDICATE LOAD 212
- INDICATE QUEUES EXP 213
- Getting help 214
- Determining who is logged on 214
- Determining storage or memory 215
- Determining software level 215
- 14.2.3 Configuring PERFSVM 218
- Using a Web browser interface 220
- Using a 3270 interface 222
- 14.3 Monitoring Linux 223
- PURGE NSS NAME MONDCSS 228
- CP SAVESEG MONDCSS 228
- References 229
- Quick reference sheets 230
- Prefix commands 231
- :help give help 232
- Appendix B. z/VM source code 233
- The CPFORMAT EXEC 234
- The CHPW540 XEDIT macro 238
- The LABEL540 EXEC 241
- The LABEL540 XEDIT macro 243
- Linux source code 245
- Related publications 257
- Online resources 258
- How to get Redbooks 258
- Help from IBM 258
- Hat Enterprise Linux 5.2 265
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