UCS 2.4 - Univention

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6 Univention Virtual Machine Manager (UVMM) 6.3.2.1 Snapshots Figure 6.4: Settings of a virtual machine UVMM offers the possibility to save the contents of the main and hard drive memory of a virtual machine in snapshots. This allows the administrator to revert to these snapshots at a later point in time, which makes them a useful “safety net” when installing software updates. Snapshots can only be used with KVM instances which access all their hard drive images in Qcow2 format. All snapshots are stored using copy-on-write (see 6.3.1) directly in the hard drive image file. Create new snapshot can be used to create a snapshot with the name of your choice, e.g., DC Master before update to UCS 2.4-2. In addition to the description the time is saved when the snapshot is created. The following list shows all available snapshots ordered reverse-chronologically. Revert can be used to return the machine to an earlier snapshot and Delete can be used to remove a snapshot. 174
6.3.2.2 Operations (Starting/stopping/suspending virtual machines) 6.3 Managing virtual machines with UVMM Instances created via UVMM are turned off in the initial status. This status can changed in the overview of the respective virtualisation server in the respective list entry or in the overview of the virtual machine itself. In the latter case, there is an Operations section, in which the status can be set. The following possibilities exist: Start starts the virtual machine. Stop turns the virtual machine off. It must be noted that the operating system is not shutdown first, i.e., it should be compared with turning off a computer by pulling the power plug. Pause assigns the instance no further CPU time. This still uses the working memory on the virtualisation server, but the instance itself is paused. Suspend saves the contents of the machine’s system memory on the hard drive and does not assign the machine further CPU time, i.e., compared with Pause the working memory is also freed. Suspended machines can be restarted with Start. This function is only available on KVM-based virtualisation servers. Resume starts assigning the instance CPU time again, so that it continues in the state it was prior to the pausing. Remove Virtual instances no longer required can be deleted along with all their hard drives and ISO images. The images to be deleted can be selected from a list. It must be noted that ISO images and sometimes also hard drive images may still be used by other instances. They should only be deleted when they are no longer used by any instance. A further function which can be found in the Operations section of the overview is the possibility of migrat- ing a virtual machine to another virtualisation server. This works with both paused and running instances (live migration). The option is only displayed if at least two compatible virtualisation servers are available in the domain. During the migration it must be noted that the images of the mounted hard drives and CDROM drive must be accesible by both virtualisation servers. This can be achieved, for example, by storing the images in a central storage system. Notes on the setting up of this type of environment can be found under [14]. 6.3.2.3 Drives (Hard drives/CD-ROM/DVD-ROM/floppy) The Drives section contains a list of the defined drives with the type, image file and size as well as the assigned storage pool. At the end of each line there is a Delete button, which can be used to remove the drive (the image file can also optionally be deleted with it). In addition, a wizard can be used to create new hard drives and CDROM drives. Adding a drive If virtual hard drives are added, image files are usually used for the data keeping. An image file can either be generated for this purpose or an existing image file can be assigned to a virtual machine. Alternatively, a hard drive partition can also be assigned to a virtual machine via the Use a local device option. 175
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Univention Corporate Server Manual
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Contents 1 Introduction 11 1.1 What
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Contents 5.3.12 Reboot . . . . . .
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Contents 10.7.2 Hardware drivers /
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Contents 14.11Including additional
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1 Introduction Contents 1.1 What is
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1.3 Further documentation selective
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2 Domain concept Contents 2.1 Intro
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2.2 UCS system roles The DC backup
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2.4 Joining domains 2.4 Joining dom
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2.4.2 How to join domains with Wind
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2.4 Joining domains If the computer
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3 Installation Contents 3.1 Introdu
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continued. 3.2 Text-based Installat
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g) Base system Attention: 3.2 Text-
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Figure 3.3: Partitioning hard drive
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3.2 Text-based Installation as the
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Figure 3.5: Selection of components
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17. System settings 3.2 Text-based
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3.4 Installing and Renewing Licence
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4 Univention Directory Manager Cont
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Figure 4.1: Unsecured start page 4.
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Figure 4.3: Automatic log-out after
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4.3 Univention Directory Manager Wi
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last names of the users, a column w
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4.4 Navigation in LDAP By clicking
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4.5 Univention Directory Manager mo
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’User account’ tab Account expi
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Attention: 4.5 Univention Directory
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Further information can be found in
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’Groups’ tab 4.5 Univention Dir
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the user is disconnected after auth
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Mail address 4.5 Univention Directo
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DNS Entry 4.5 Univention Directory
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’General’ tab Name (*) 4.5 Univ
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Reverse zone for DNS entry 4.5 Univ
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’Deployment’ tab 4.5 Univention
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’General’ tab Name (*) 4.5 Univ
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Browseable 4.5 Univention Directory
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Valid users 4.5 Univention Director
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Clients can send a lock request wit
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Subtree checking 4.5 Univention Dir
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Disconnect Time 4.5 Univention Dire
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Manufacturer 4.5 Univention Directo
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’Samba’ tab 4.5 Univention Dire
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’Alias’ tab Canonical name (*)
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server. Attention: 4.5 Univention D
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• Lease time • NetBIOS • Rout
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Last address 4.5 Univention Directo
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4.5.10.5 DHCP host 4.5 Univention D
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4.5.11.1 Adding a policy 4.5 Univen
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Declines 4.5 Univention Directory M
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’[DHCP NetBIOS]’ tab NetBIOS na
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RAM on the graphics adapter in kb 4
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Page 141 and 142: Displayed attributes 4.5 Univention
Page 145 and 146: Data type Syntax 4.5 Univention Dir
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Page 157 and 158: 5.3.2 Kernel modules 5.3 Standard m
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Page 161 and 162: Figure 5.6: List of partitions 5.3
Page 163 and 164: 5.3.10 Joining a domain Figure 5.8:
Page 165 and 166: 5.3.13 Online update Figure 5.10: R
Page 167 and 168: Figure 5.13: Online update: compone
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Page 181 and 182: 7 UCS Directory service Contents 7.
Page 183 and 184: tions. 7.4 Configuration of LDAP AC
Page 185 and 186: - Using a concrete DN via dn.base,
Page 187 and 188: 8 Services for Windows Contents 8.1
Page 189 and 190: 8.2.3 Print server 8.3 Building Sam
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Page 203 and 204: 9 Desktop systems Contents 9.1 Intr
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Page 221 and 222: 10 Basic System Services Contents 1
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10.3.5 Testing Univention Firewall
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sudo tool for running users with el
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10.6 Logging of system messages and
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10.8 GRUB boot manager The GRUB boo
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10.9.3 Defining cron jobs in Univen
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10.12 SSH In the basic setting, a r
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11 Software maintenance Contents 11
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11.2 UCS updates system version whi
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11.3.1 Assigning repository servers
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11.3 Package maintenance repository
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Figure 11.2: Package list client 11
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11.3.6.4 Information about installe
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11.5 Repository management a reposi
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univention-repository-merge --dest
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example, synchronisation as of UCS
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12 Mail Contents 12.1 Introduction
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12.3 Setting up the mail server To
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12.3 Setting up the mail server ent
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12.5 Virus filters can be changed i
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Field Value to be entered 12.6 Conf
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13 Print services Contents 13.1 Int
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13.2.3 Windows systems as print ser
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13.3 Configuring printer shares Onc
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13.5 Print quota 13.5 Print quota T
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13.5 Print quota entry is confirmed
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13.5 Print quota -G -pgroups pg1[,p
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14 Univention Configuration Registr
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sshd/permitroot: yes sshd/xforwardi
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14.5 Creating new Univention Config
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14.8 Regeneration of configuration
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14.10 Univention Configuration Regi
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closed with the string @!@. 14.12 I
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15 Univention System Setup Contents
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Figure 15.2: Basic settings in Univ
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Figure 15.4: Language settings in U
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15.2 Univention System Setup module
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15.2.6 Time zone Time zones can be
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15.5 Changing machine passwords/SSL
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16 Frequently asked questions Conte
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16.3 How does a user change his pas
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16.7 Thin clients experience log-in
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16.12 Avoiding double log-ins on Wi
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Bibliography [1] Univention. Overvi
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[26] Univention. Web proxies with U
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UCS 2.4 - Univention

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