...
LAN
|
+-----------+---------+
| | |
| eth0 |
| | |
| +---------+-------+ |
| | | | |
| | dummy | |
| | | |
| | xenbr0 | |
| | | |
| | vif0.0 vif1.0 | |
| | | | | |
| +---+---------+---+ |
| | | |
| +---+---+ +---+---+ |
| | | | | | | |
| | eth0 | | eth0 | |
| | | | | |
| | DomU0 | | DomU1 | |
| +-------+ +-------+ |
+---------------------+/etc/network/interfaces example for single MAC address on the LAN. The DomUs are configured to use 192.168.42.100 as default gateway:
...
# Configure netfilterpre-up iptables-restore < /etc/iptables.conf
...
# dummy0auto dummy0iface dummy0 inet manual# xenbr0auto xenbr0iface xenbr0 inet static bridge_ports dummy0 address 192.168.42.100 broadcast 192.168.42.255 netmask 255.255.255.0 bridge_stp off # Disable Spanning Tree Protocol bridge_waitport 0 # No delay before a port becomes available bridge_fd 0 # No forwarding delayBridge references
- TLDP's Ethernet Bridge + netfilter Howto (ish, old): http://www.tldp.org/HOWTO/Ethernet-Bridge-netfilter-HOWTO.html
- Xen: Common problems with network bridges: http://www.novell.com/support/kb/doc.php?id=7001989
- Considering the "bridge_stp off" parameter. http://wiki.xen.org/wiki/Xen_Bridge_Loop#Why_STP_is_turned_off.3F
...
On Debian, to set them during boot, put them in /etc/sysctl.conf
TODO: give examples of iptables rules that do routing.
NATting
To set up NATting (example is for eth0):
...
Its format, for use with the xl toolstack, is documented at http://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html.
Kernel parameters
Use the extra configuration item.
xl shutdown and reboot does not effect changed configuration items; a create is required.
Kernel parameters
Use the extra configuration item.
Memory
Set by the memory configuration item. Numeric only (no M or G suffix allowed). Units are MB (or MiB?).
vif
vif (Default=[]; Value="type=TYPE, mac=MAC, bridge=BRIDGE, ip=IPADDR, script=SCRIPT," + \ "backend=DOM, vifname=NAME, rate=RATE, model=MODEL, accel=ACCEL" )
...
When creating Debian systems it uses debbootsrap (described above).
Required Debian packages
ntp is required. Ref: http://xen.1045712.n5.nabble.com/keeping-time-in-sync-tp5725115p5725116.html
Controlling DomUs
Start a DomU
...
To shutdown the OS and destroy the DomU: xl shutdown <DomU config path><domain-id>
For example:
cd /etc/xen && xl list
xl shutdown <domain-id> 5
In case the DomU's OS has been stopped (or will not stop!): xl destroy <domain-id>
...
Detach from the console by Ctl+[ ] or, for putty, Ctl+5
Troubleshooting
...
| File or directory | Usage | Notes |
|---|---|---|
| /etc/default/xen | Toolstack selection | |
| /etc/default/xend | ||
| /etc/default/xendomains | Domain startup and shutdown config | |
| /etc/xen/ | ConfigurationConfiguration | |
| /etc/xen/*.cfg | Individual DomU configs | |
| /etc/xen/scripts/ | Scripts  and scrippets | As installed, all bash scripts. More: Xen scripts |
| /etc/xen/xend-config.sxp | xend daemon (and xen-tools) configuration | |
| /etc/xen/xl | xl defaults config | |
| /proc/xen/ | xen-kernel information | |
| /var/lib/libvirt/images | File-based images | |
| /var/lib/xen/dump/ | Guest core dumps | |
| /var/log/xen | Logs |
...