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Install GuestOS in a virtual disk
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| [1] | I created GuestOS in LVM partition, but in this section, I create it in an image-file like Vmware products. It's easier to backup or move to another computer than the one in LVM partition. However, it's slower to access to disks than the one in LVM, though. |
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[root@ns ~]# mkdir /var/xen [root@ns ~]# dd if=/dev/zero of=/var/xen/lan.img bs=1 count=1 seek=20G 1+0 records in 1+0 records out 1 byte (1 B) copied, 7.8e-05 seconds, 12.8 kB/s [root@ns ~]# dd if=/dev/zero of=/var/xen/lan.swap bs=1 count=1 seek=1G 1+0 records in 1+0 records out 1 byte (1 B) copied, 8e-05 seconds, 12 kB/s [root@ns ~]# [root@ns ~]# mkswap /var/xen/lan.swap Setting up swapspace version 1, size = 1073737 kB [root@ns ~]# mkfs -t ext3 -F /var/xen/lan.img mke2fs 1.39 (29-May-2006) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) 2621440 inodes, 5242880 blocks 262144 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 160 block groups 32768 blocks per group, 32768 fragments per group 16384 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 39 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. [root@ns ~]# mount -o loop /var/xen/lan.img /mnt [root@ns ~]# cp root.tgz /mnt/ # copy it created in (3)-[3] [root@ns ~]# cd /mnt [root@ns mnt]# tar zxvf root.tgz [root@ns mnt]# rm -f root.tgz [root@ns mnt]# cp /root/usr.tgz usr/ # copy it created in (3)-[3] [root@ns mnt]# cd usr [root@ns usr]# tar zxvf usr.tgz [root@ns usr]# rm -f usr.tgz [root@ns usr]# cd ../var [root@ns var]# cp /root/var.tgz ./ # copy it created in (3)-[3] [root@ns var]# tar zxvf var.tgz [root@ns var]# rm -f var.tgz [root@ns var]# cd ../ [root@ns mnt]# vi etc/fstab # specify file system in fstab /dev/hda1 / ext3 defaults 1 1 devpts /dev/pts devpts gid=5,mode=620 0 0 tmpfs /dev/shm tmpfs defaults 0 0 proc /proc proc defaults 0 0 sysfs /sys sysfs defaults 0 0 /dev/hda2 swap swap defaults 0 0 [root@ns mnt]# vi etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=yes HOSTNAME= lan .server-linux.info# change hostname GATEWAY=192.168.0.1 [root@ns mnt]# vi etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=static BROADCAST=192.168.0.255 #HWADDR=00:13:72:0F:00:80 IPADDR=192.168.0. 31 # change IP address IPV6ADDR= IPV6PREFIX= NETMASK=255.255.255.0 NETWORK=192.168.0.0 ONBOOT=yes [root@ns mnt]# vi etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 lan .server-linux.info lan localhost.localdomain localhost::1 localhost6.localdomain6 localhost6 [root@ns mnt]# [root@ns ~]# umount /mnt [root@ns ~]# cp /etc/xen/www /etc/xen/lan [root@ns ~]# vi /etc/xen/lan # change like below kernel = "/boot/vmlinuz-2.6.18-8.1.1.el5xen" ramdisk = "/boot/initrd-2.6.18-8.1.1.el5xen.img" memory = "512" name = " lan "vcpus = "2" nicks = "1" vif = [ 'mac=00:16:3e:00:00: 20 ,bridge=xenbr0' ]disk = [ ' file:/var/xen/lan.img,hda1,w ',' file:/var/xen/lan.swap,hda2,w ' ]root = "/dev/hda1 ro" extra = "3" [root@ns ~]# xm create -c lan CentOS release 5 (Final) Kernel 2.6.18-8.1.3.el5xen on an i686 lan.server-linux.info login: [root@lan ~]# chmod 1777 /tmp # change permission |
| [2] | Backup image-file of GuestOS. |
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[root@ns ~]# # on Host [root@ns ~]# cp /var/xen/lan.img /root/root.img [root@ns ~]# cp /var/xen/lan.swap /root/swap.img [root@ns ~]# total 3957992 -rw------- 1 root root 1333 May 11 18:39 anaconda-ks.cfg -rw-r--r-- 1 root root 18026 May 11 18:39 install.log -rw-r--r-- 1 root root 2889 May 11 18:39 install.log.syslog -rw-r--r-- 1 root root 21474836481 May 11 18:39 root.img -rw-r--r-- 1 root root 60396721 May 11 18:39 root.tgz -rw-r--r-- 1 root root 1073741825 May 11 18:39 swap.img -rw-r--r-- 1 root root 299138604 May 11 18:39 usr.tgz -rw-r--r-- 1 root root 88646338 May 11 18:39 var.tgz
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| [3] | Add new GuestOS from backup file. |
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[root@ns ~]# cp root.img /var/xen/rx7.img [root@ns ~]# cp swap.img /var/xen/rx7.swap [root@ns ~]# mount -o loop /var/xen/rx7.img /mnt [root@ns ~]# vi /mnt/etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=yes HOSTNAME= rx7 .server-linux.info# change hostname GATEWAY=192.168.0.1 [root@ns ~]# vi /mnt/etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=static BROADCAST=192.168.0.255 #HWADDR=00:13:72:0F:00:80 IPADDR=192.168.0. 32 # change IP address IPV6ADDR= IPV6PREFIX= NETMASK=255.255.255.0 NETWORK=192.168.0.0 ONBOOT=yes [root@ns ~]# umount /mnt [root@ns ~]# cp /etc/xen/lan /etc/xen/rx7 [root@ns ~]# vi /etc/xen/rx7 # change like below kernel = "/boot/vmlinuz-2.6.18-8.1.1.el5xen" ramdisk = "/boot/initrd-2.6.18-8.1.1.el5xen.img" memory = "512" name = " rx7 "vcpus = "2" nicks = "1" vif = [ 'mac=00:16:3e:00:00: 21 ,bridge=xenbr0' ]disk = [ ' file:/var/xen/rx7.img,hda1,w ',' file:/var/xen/rx7.swap,hda2 ' ]root = "/dev/hda1 ro" extra = "3" [root@ns ~]# xm create -c rx7 CentOS release 5 (Final) Kernel 2.6.18-8.1.3.el5xen on an i686 rx7.server-linux.info login: [root@rx7 ~]# chmod 1777 /tmp # change permission [root@ns ~]# # on Host [root@ns ~]# xm list Name ID Mem(MiB) VCPUs State Time(s) Host 0
510
2
r-----
34.6 lan 3
511
2
-b----
10.8 rx7 4
511
2
-b----
13.9 2
511
2
-b----
19.4 www 1
511
2
-b----
12.3 |