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Chapter 13. Miscellaneous recipes 191
To enter a rescue environment, initiate an interactive Linux installation. Perform the following
steps to enter a rescue environment on the LINUX03 user ID:
1. Logon to LNXMAINT. Copy the RHEL5 EXEC file to a new file named RESCUE EXEC, and copy the
user’s PARM-RH5 file to a new file (LINUX03 RESCUE, in this example):
==> copy rhel52 exec d rescue = =
==> copy linux03 parm-rh5 d = rescue =
2. Next, edit RESCUE EXEC to point to the new LINUX03 RESCUE file:
==> xedit RESCUE EXEC
...
00005 'PUN RHEL52 KERNEL * (NOH'
00006 'PUN' userid() ' RESCUE * (NOH'
00007 'PUN RHEL52 INITRD * (NOH'
...
==> file
3. Edit the LINUX03 RESCUE file, replacing any kickstart or VNC lines with the rescue
command line option:
==> xedit LINUX03 RESCUE
ramdisk_size=40000 root=/dev/ram0 ro ip=off
CMSDASD=191 CMSCONFFILE= LINUX03.CONF-RH5
rescue
4. Now logoff from LNXMAINT and logon to LINUX03. Respond no to the IPL from DASD
question, and run RESCUE EXEC.
==> rescue
Linux version 2.6.18-92.el5 (brewbuilder@spark.z900.redhat.com) (gcc version 4.1
.2 20071124 (Red Hat 4.1.2-41)) #1 SMP Tue Apr 29 13:16:58 EDT 2008
We are running under VM (64 bit mode)
Detected 4 CPU's
Boot cpu address 0
Built 1 zonelists. Total pages: 524288
Kernel command line: ramdisk_size=40000 root=/dev/ram0 ro ip=off
CMSDASD=191 CMSCONFFILE=Z12.conf
rescue
...
The install process directs you to telnet or SSH to the IP address of your Linux server to
begin the first stage of the installation.
5. Use SSH to connect and log in as root. After choosing the language, the rescue
environment will prompt you for the location of the rescue image, which is located in the
install tree on the controller.
6. Choose NFS image, then enter the IP address or host name of the controller and the path
/nfs/rhel5.2
7. The rescue image will search for your Linux installation and will prompt you to mount the
partitions it finds. When prompted, select Continue to mount the partitions. After this, you
will be presented with a shell prompt. Because you chose to mount your root partition, it
will be automatically mounted to the /mnt/sysimage directory.
You can use the chroot command to run an interactive bash shell from the /mnt/sysimage
directory. To do this, run the following command:
sh-3.2# chroot /mnt/sysimage /bin/bash
The /bin/bash argument instructs chroot to run the bash shell after changing the root
directory to /mnt/sysimage. From the chroot shell, the system appears almost exactly as it
would if it were running (the only difference is that, because udev is not running, there may
- 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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