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Hodnocené. / 5. Na základě hodnocení zákazníků
190 The Virtualization Cookbook for Red Hat Enterprise Linux 5.2
9.12.5.32:/home/ldapuser1 on /home/ldapuser1 type nfs (rw,addr=9.12.5.32)
You have now configured the automounter to mount a remote LDAP user’s home directory at
login.
Shut down the golden image, and IPL the controller (200). Clone a new virtual server using
the clone.sh script. Start an SSH session to the new virtual server and LDAP authentication,
and the automounting of /home/ using NFS should work.
13.4 Rescuing a Linux system
This section describes how to boot your Linux server into different modes for troubleshooting
purposes. It covers booting Linux into single user mode, and also entering a rescue
environment when you require more advanced troubleshooting.
13.4.1 Entering single user mode
Single user mode is helpful when you need to recover the root password, or if you are having
problems while booting Linux into the default runlevel. To enter single user mode, first IPL
your Linux server from the 3270 console. You will see a message similar to the one shown
here:
zIPL v1.3.2 interactive boot menu
0. default (linux)
1. linux
Note: VM users please use '#cp vi vmsg <input>'
Please choose (default will boot in 15 seconds):
Use the #cp vi vmsg command to boot the desired menu option (zero (0), in this example),
followed by the number 1 for single user mode:
==> #cp vi vmsg 0 1
After some initial kernel boot messages, you should see:
INIT: Entering runlevel: 1
Entering non-interactive startup
Telling INIT to go to single user mode.
INIT: Going single user
INIT: Sending processes the TERM signal
INIT: Sending processes the KILL signal
sh-3.00#
In single user mode, you are logged in as the root user. You can use the passwd command to
set the root password. All of the file systems in /etc/fstab are mounted, but networking has
not been started. To exit single user mode, you can type reboot, or enter init 3 to continue
booting normally.
13.4.2 Entering a rescue environment
If you encounter errors mounting the root file system, or have other problems that prevent you
from entering single user mode, you can enter a
rescue environment. This environment loads
a Linux image in memory, and does not attempt to mount the root file system.
- 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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