Here are some useful Linux commands to use in a XenServer SSH session or at the XenServer console. Compiled by the guys at Citrix...

xe help --all|more
Show a list of XenServer CLI commands

xsconsole
Runs up the XenServer text based console

xe-toolstack-restart
Restarts the XenServer management tools

ls –l
List files in a Directory

less /var/log/dmesg
Display Boot Messages from Linux

xe host-dmesg
Xen Hypervisor Boot messages

tail –f /var/log/xensource.log
Look at xapi messages as they happen

tail –f /var/log/xensource.log | grep xxx
Look at xapi messages only for vm uuid xxx

tail –f [log name] > [target filename]
Send output to a file for analysis later

cat /etc/xensource-inventory
Display XenSource Inventory info

xen-bugtool --yes
Build a status report when xapi is down

xe-backup-metadata -d –u [uuid of SR]
Back up Pool metadata for all VMs

tcpdump –i [inf] –vvv –w [filename]
Get a Packet trace from [inf]. E.g. Inf=eth0, xenbr0, vif2.0 etc.

top
List the top processes running in Dom0

xentop
List top Xen processes

mpstat 5
Processor stats in Dom0

vmstat 2
Virtual memory in Dom0

netstat –s
Networking statistics

iostat -d 2 6
Storage traffic stats

list_domains
Lists VMs that are running

fdisk –l
List the disk partitions

hdparm –t /dev/sda3
Device read times for sda3 (normally local SR)

pvs
Show local and remote LVHD SRs

ll /dev/disks/by-id
Look at disk partitions

lvs
List logical volumes (virtual disks)

vgs
List LVM volume groups

cd /var/run/sr-mount
Look at NFS SRs

df -h
Shows how much disk space you have left

dd if=/dev/sdb of=/dev/null iflag=direct bs=1M count=512
Read data performance from sdb.

dd if=/dev/zero of=/dev/sdb oflag=direct bs=1M count=4096
Write performance on sdb. * Don’t use on disks with VMs on them!

ifconfig
Show info on NICs, virtual switches and vNICs

brctl show
Show info on virtual switches

ethtool eth0
Info for NIC eth0

mii-tool
Info on NIC bonding

iscsiadm -m discovery --type sendtargets --port 192.168.250.14
Discover iSCSI targets available to this server

iscsiadm –m session
Open iscsi sessions

history
Lists the history of commands you’ve used

!136
Executes command #136 in the history

history -w history-list.txt
Writes the history info to a text file

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