The Virtualization Cookbook for SLES 10 SP2 - z/VM - IBM

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► Rerun the same scp commands: # time scp -c 3des-cbc /tmp/testdata.txt localhost:/dev/null Password: testdata.txt 100% 200MB 66.7MB/s 00:03 real 0m5.890s user 0m1.542s sys 0m0.558s # time scp -c aes128-cbc /tmp/testdata.txt localhost:/dev/null Password: testdata.txt 100% 200MB 66.7MB/s 00:03 real 0m6.287s user 0m0.993s sys 0m0.541s # time scp /tmp/testdata.txt localhost:/dev/null Password: testdata.txt 100% 200MB 66.7MB/s 00:03 real 0m4.839s user 0m0.996s sys 0m0.548s ► Delete the test file: # rm /tmp/testdata.txt You should see an improved througput. 13.9 The X Window System For many years UNIX-like operating systems have been using the X Window System (commonly just “X”). This system was designed to provide client/server, hardware-independent and network-enabled graphical environment. The current version is X11 which is widely used on UNIX and Linux platforms. Confusion often arises among new X users regarding the concept of client and server, because client and server are defined from an application point of view where other protocols such as SSH, Telnet and FTP they are defined from an end user point of view. In X the server runs on the hardware with the mouse, keyboard and monitor (usually a workstation or a desktop), while the client runs on the UNIX or Linux server. Many Linux desktop users don’t recognize this difference because they often run both the server and client on their desktop. It is a common practice to connect from a PC (SSH client) to remote Linux (SSH server) and then run an X application. It runs on remote Linux (X client) and displays on local PC (X server). The X communication protocol by its nature is not secure at all. For this reason it is often used together with SSH protocol, which tunnels X11 traffic using encrypted (and thus secure) communications. X11 itself provides the ability to display graphics on raster display, nothing more. If the user wants to be able to move, resize and otherwise manage windows, a window manager is needed. There are many window managers available; some are lightweight while some are more robust. So using a window manager is a good idea because it provides functionality which one expects from a GUI. 216 The Virtualization Cookbook for RHEL 6
13.9.1 VNC Server When you have Linux installed on your workstation, a window manager is probably not enough. Here you want a full desktop environment with menus, icons, task bars etc such as Gnome and KDE. Installing GNOME or KDE on System z is discouraged as they are resource-intensive. Installing The X Window System is also not recommended. As mentioned earlier, the X server is run where the mouse, keyboard and monitor are located - on the workstation. In a nutshell, VNC Server provides virtual workstation with all this peripherals (virtual). The VNC server starts an embedded X server. Then any X-based application can send its output to this X server, regardless of if the applications is local or remote to X server. To interact with the X server, one uses VNC client on a workstation, as described in section 3.2, “Setting up a VNC client” on page 23. The VNC server customization is described in section 8.2.4, “Configuring the VNC server” on page 140. In our experience this is all you need if you want to run X applications from time to time. One big advantage of VNC is that it is session oriented. If communication to VNC server is lost, a new connection is reestablished to the session as it was. Also, applications in a disconnected VNC session still continue to run. 13.9.2 X Server on workstation If for some reason VNC is not acceptable, it is possible to use a standard X server on a workstation. Since Linux users usually know the X Window system, an X server running on Windows is described in this section. There are many commercial and free X Window servers available for Windows. In the following examples XliveCD is used, which provides a free X server based on Cygwin. It can be run directly from a CD without requiring installation. http://xlivecd.indiana.edu/ Any X application will send its output to an address defined with -display parameter or, if not provided, to an address specified in the DISPLAY environment variable. If neither is provided, the local computer is used for output. Following is an example that uses the xclock command (you may have to first install it with the command yum -y install xclock): gpok224:~ # xclock Error: Can't open display: There is no display specified for xclock command and it will terminate. Display is specified by setting DISPLAY environment variable. gpok224:~ # export DISPLAY=9.145.177.158:0 gpok224:~ # xclock No protocol specified Error: Can't open display: 9.145.177.158:0 This command failed, because the XliveCD requires an explicit command to allow remote hosts to connect to it. When the command xhost + (plus means to add authorized hosts) is run, xclock can finally display on Windows as shown in Figure 13-2. Remember the program itself runs on a remote Linux. gpok224:~ # xclock & [1] 21915 Chapter 13. Miscellaneous recipes 217
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z/VM and Linux on IBM System z: The
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4.1.3 Copying a vanilla z/VM system
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8.2.4 Configuring the VNC server .
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14.4 Viewing Linux data in the Perf
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► Chapter 9, “Configuring RHEL
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Sue Baloga, Bill Bitner, Carol Ever
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z/VM 6.1 z/VM 6.1, available in Oct
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► Shared read-only Linux /usr/ fi
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6 The Virtualization Cookbook for R
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- DASD: 27 3390-3s or 9 3390-9s at
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2.2.2 Backup file naming convention
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One rule that can be recommended is
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2.6.2 z/VM DASD used in this book T
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2.7 Blank worksheets Blank copies o
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2.7.3 Linux resources worksheet Use
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Figure 3-1 PuTTY Configuration wind
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9. You may choose a larger screen s
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Click the Download and Use button.
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26 The Virtualization Cookbook for
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4.1 Installing z/VM from DVD or FTP
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Figure 4-2 Choosing two files to be
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► The LPAR that z/VM will be inst
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c. You should see the Disruptive Ta
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► You may need to clear the scree
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Figure 4-11 Load window ► When yo
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==> Press Enter at the VM READ prom
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Figure 4-14 IPWIZARD screen 2 ► A
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One default setting that can be dan
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Pay attention to the output. If you
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==> rename profile tcpip d poksnd61
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You should see that the VSWITCH VSW
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6285-6287 ATTACHED TO MAINT ► Use
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CP_Owned Slot 6 UP6285 CP_Owned Slo
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==> x user direct c ====> bottom ==
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4.7.2 Logging and customizing the n
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4.7.5 Copying files associated with
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4.8.2 Testing the changes To test y
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HCPDIR494I User directory occupies
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==> link * cf1 cf1 mr ==> acc cf1 f
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... ==> link $page$ a03 a03 mr ==>
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When SERVICE is successfully comple
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5.1.2 Downloading the service files
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==> deterse s8873950 shiprsu1 f = s
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***********************************
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APAR Component Description VM64774
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Figure 5-4 Downloading service for
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5.2.3 Verifying the zEnterprise 196
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5.4.1 Getting service using ShopzSe
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Figure 5-7 Getting fixes from Shopz
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► Use the SERVICE ALL command spe
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6.1 Installing Linux on the PC If y
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6.3.3 Copying the DVD contents Copy
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6.5 Configuring an FTP server for z
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6.5.3 Testing the anonymous FTP ser
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==> copy user direct c = direwrks =
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► Go back to the top of the file
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8016384 bytes sent in 00:01 (6.01 M
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LOGON AT 07:41:38 EDT WEDNESDAY 09/
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Figure 7-1 Initial screen of instal
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Figure 7-4 Splash screen and device
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► On the next screen the host nam
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► On the Add Partition screen, cr
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Figure 7-12 Creating a volume group
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# mount 9.60.18.240:/nfs/rhel6/dvd1
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# chkconfig --list | grep 3:on abrt
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► Edit /etc/init/control-alt-dele
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► View your order with the swapon
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MDISK 100 3390 0001 3338 UM63A2 MR
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NFS server directory you just set u
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► A warning screen will appear as
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► Click Create and on the resulti
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dev/dasda1 on / type ext4 (rw) proc
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► Import the RPM GPG key so that
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This allows the cloner to initiate
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DASD 63AA FR63AA , DASD 63AB FR63AB
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There are many ways to clone Linux
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0.0.0100 active dasda 94:0 ECKD 409
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Initializing cgroup subsys cpuset I
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4 If you specified a value for 3 ab
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Then the SSH keys are regenerated i
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USER $ALLOC$ NOLOG MDISK A01 3390 0
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► Verify that the new user IDs ha
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# cd /nfs # mkdir ks # cd ks ► Co
Page 178 and 179: RUNKS=1 cmdline ====> file ► Next
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Page 182 and 183: 11.1.2 Testing Apache apr-util-ldap
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Page 192 and 193: This change will create an SMB shar
Page 194 and 195: Figure 11-2 Mapping a network drive
Page 196 and 197: Dependency Installed: apr.s390x 0:1
Page 200 and 201: discarded, and later when all is te
Page 204 and 205: ► Add minidisk statements to defi
Page 206 and 207: 13.2 Adding a logical volume There
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Page 210 and 211: # reboot Broadcast message from roo
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Page 216 and 217: # ls access_denied in_recovery stat
Page 218 and 219: ==> #cp vi vmsg 0 1 In single user
Page 220 and 221: Note: if the rescue image cannot fi
Page 222 and 223: -/+ buffers/cache: 98 654 Swap: 761
Page 224 and 225: idle The current idle percentage Th
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Page 230 and 231: Figure 13-2 Manual setting of DISPL
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Page 236 and 237: 14.1.1 Using the INDICATE command z
Page 238 and 239: list. Normal virtual processors in
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Page 242 and 243: a. Use the VMLINK command to both l
Page 244 and 245: 14.2.4 Increasing the size of the M
Page 246 and 247: Figure 14-1 Performance Toolkit log
Page 248 and 249: Figure 14-3 Performance Toolkit 327
Page 250 and 251: 14.4 Viewing Linux data in the Perf
Page 252 and 253: A.2 Online resources These Web site
Page 254 and 255: 1. Input mode - the Insert key, i,
Page 256 and 257: B.2 z/VM REXX EXECs and XEDIT macro
Page 258 and 259: parse upper var dasds dasd dasds da
Page 260 and 261: eturn retVal /* from formatOne */ /
Page 262 and 263: 'command c/USER 6VMRSC10 6VMRSC10/U
Page 264 and 265: B.3 Linux code end /* else */ This
Page 266 and 267: # If there are still command line a
Page 268 and 269: cp_cmd LINK $source_id $source_mdis
Page 270 and 271: 3) # user ID does not exist echo "$
Page 272 and 273: [ $? -ne 0 ] && echo "Error: timed
Page 274 and 275: shift fi # If no command line optio
Page 276: 264 The Virtualization Cookbook for
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