dv1 configuration notes

• eth1 has IP address 192.168.0.253
• Disks are in s/w raid, partition 1 (boot) and 2 (root) straight on md0 and 1, the rest is an LVM PV, on md2
• dv1 installation

www1

Has swap as partition on lv1.

dv2 configuration notes

• eth1 has IP address 192.168.0.243
• Disks are on h/w raid, partition 1 is the compaq special BIOS partition, partition 2 is boot, partition 3 is a big LVM PV, with the first lv0 the root partition.
• dv2 installation

Todo

• alpha, bravo: logwatch
• werk traffic bij
• werk homepage bij
• maak demo van panel via flash
• Ruby
• charlie: problem in panel_new_vps.php
• bravo: Fix problem where eth0 doesn't come up after booting
• bravo: can't mail from there. install postifx and aliases
• Make sure all network interfaces can be read out and plotted
• Test transfer of large 1G files
• Make copy-on-write thing

New VPS

• Check user data, does it look good?
• Go to table users. Look up username and machinename and combine, for instance joop_dnsbox -- write it down
• Go to table VPS. Make up a short machinename and fill it in, write down vps_id. Write down the distro.
• Go to table vps_if and note the number of new interfaces, write down MAC adresses
• Go to table ip_addr. Write down the assigned IP addresses, or if there weren't any, create new and assign them.
• Go to alpha. See if there's enough space free, vgdisplay
• Create new lv according to type of VPS, sudo lvcreate -L 5G -n username_vpsname vg0
• Copy base install to new lv; sudo cp /dev/vg0/staff_centos5 /dev/vg0/lvX
• Enlarge partition with fdisk /dev/vg0/username_vpsname, delete the partition and create a new one which covers the full space
• Enlarge filesystem. First add partition to mapper: kpartx -a /dev/vg0/username_vpsname. Check what name the mapper generated: ls /dev/mapper.
• Then run fsck: e2fsck -f /dev/mapper/vg0-username_vpsname1. Then resize: resize2fs /dev/mapper/vg0-username_vpsname1
• Make file in /etc/xen/auto naming it after username/machinename, using generated MAC addresses, memory appropriate for VPS type and a UUID using uuidgen
• Start the image, use serial console: xm create -c /etc/xen/auto/username_machinename
• Set noatime,nodiratime in /etc/fstab
• Configure all interfaces with IP addresses, for CentOS in /etc/sysconfig/network-scripts/ifcfg-ethX and for Debian in /etc/network/interfaces
• Debian: if you have multiple interfaces it's best to install package "ifrename", create an /etc/iftab with entries "eth0 mac xx:xx:..." and edit /etc/init.d/ifrename start function to add the -t flag.
• Debian: the MAC address is stored in /etc/udev/rules.d/70-persistent-net.rules, change it
• Set hostname in /etc/sysconfig/network (CentOS) or /etc/hostname (Debian)
• Set nameserver in /etc/resolv.conf
• Check out how swapspace is set up
• Exit domU and reboot it
• Check if external interfaces come up
• Check if swapspace comes up
• ssh to domU
• check hostname and interfaces
• Test networking; do a wget
• Generate SSH server keys:

 ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
 ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa

• clear logs
• Reset root password
• Set user active
• Set DNS entry, as well as reverse entry
• Test shutdown/startup through panel
• Restart snmpd so the new network interface is exported: sudo service snmpd restart
• Send mail to client about the new VPS

Update MRTG

• Login to charlie
• Create a new config file, then add the comments for totalling:

  /usr/bin/cfgmaker --ifref=descr --ifdesc=eth \
  --global 'HtmlDir: /var/www/mrtg' \
  --global 'ImageDir: /var/www/mrtg' --global 'LogDir: /var/lib/mrtg' \
  --global 'ThreshDir: /var/lib/mrtg' public@alpha > tmp.cfg

  grep "Target\[alpha_x\." tmp.cfg | sed -e 's/^.*\[//' \
  -e 's/\].*$//' -e 's/\(.*\)/#-#Total\[\1\]: Totals/' >> tmp.cfg

• Then copy the newly generated file to /etc/mrtg under the name mrtg4.cfg
• Test mrtg by executing the command specified in /etc/cron.d/mrtg manually. No errors should show up.
• Remove the file /var/lib/mrtg/mrtg.ok when the problem "Can not determine ifNumber" is reported by mrtg.

New test VPS

• First carve out a snapshot volume

To do long term

VMs with:

• CIFS
• WebDav
• Asterisk
• Exchange clone
• Exchange itself
• Oracle, DB2
• Tomcat, Jira
• JBoss
• Encrypted disk
• Shoutcast
• Subversion
• Trixbox
  Set up a wiki which describes installation of the above
  Put it on a separate .info domain
• Qt applet or Firefox extension for status VM and messages from the admin or syslog

Links

http://lonesysadmin.net/2007/06/21/how-to-configure-ipmi-on-a-dell-poweredge-running-red-hat-enterprise-linux/

Backing up an LVM

Plain backups:

  sudo cat /dev/vg0/my_lv0_name | gzip -c > my_lv0_name.img.gz

Or compression with partimage. Shut down the domU, then:

  sudo kpartx -a /dev/vg0/my_lv0_name
  sudo e2fsck /dev/vg0/my_lv0_name1
  ... Check all partitions ...
  sudo partimage -b -z1 -d save /dev/mapper/my_lv0_name1 \
        /mnt/backups/my_lv0_name1.partimg.gz