This page recaps the actions you can perform if you have any problems with your XOA.

XOA deploy error

Auto deploy failed. - No SR specified and Pool default SR is null

It means you don't have a default SR set on the pool you are importing XOA to. To set a default SR, you must first find the SR UUID you want, with xe sr-list. When you have the UUID, you can set the default SR with: xe pool-param-set default-SR=<SR_UUID>. When this is done, re-enter the deploy script command and it will work!

XOA unreachable after boot

XOA uses HVM mode. If your physical host doesn't support virtualization extensions, XOA won't work. To check if your XenServer supports hardware assisted virtualization (HVM), you can enter this command in your host: grep --color vmx /proc/cpuinfo. If you don't have any result, it means XOA won't work on this hardware.

Empty page after login

This happens when your antivirus or firewall is blocking the websocket protocol. This is what we use to communicate between xo-server and xo-web (see the architecture page).

The solution is to use HTTPS. When doing so, websockets will be encapsulated in the secured protocol, avoiding interception from your firewall or antivirus system.

XOA migration issues

By default, XOA has a static max memory set to 16GiB. Sometimes you can have trouble migrating with this error message:

"Failed","Migrating VM 'XOA' from '<origin_hostname>' to '<destination_hostname>'
Internal error: Xenops_interface.Internal_error("Domain.Xenguest_failure(\"Error while waiting for suspend notification: xenguest: xc_domain_save: [1] Save failed (0 = Success)\")")

In this case, it means you need to reduce the static max memory field to a lower value, and try again.

XOA boot issues

XOA is configured in HVM. It means you need hardware that supports HVM instructions (almost all hardware since 2011). If that's not the case, the symptom is this:

  1. XOA VM starts for few seconds
  2. Then it shuts down

Please check that you have enabled virtualization settings in your BIOS or upgrade your hardware.

XOA configuration

XOA is a virtual appliance running Debian with Xen Orchestra installed. If you have any problems, the first thing to do is to use our check service by running the xoa check command in a terminal:

$ xoa check
✔ Node version
✔ Disk space for /var
✔ Disk space for /
✔ XOA version
✔ xo-server config syntax
✔ Appliance registration
✔ Internet connectivity

If you have something completely different than that, or error messages, lost packets etc., it means you have a problem.

Network issues

You can see your current network configuration by running ifconfig eth0. If you have an external firewall, please check that you allow the XOA's IP.

You can modify the IP configuration with xoa network static (for a static IP address) or xoa network dhcp to use DHCP.


Sometimes xo-server runs out of memory, this can be seen in the logs (journalctl -u xo-server.service):

<--- Last few GCs --->
48734864 ms: Mark-sweep 1359.7 (1422.6) -> 1359.7 (1438.6) MB, 1675.5 / 0.0 ms [allocation failure] [scavenge might not succeed].
48736444 ms: Mark-sweep 1359.7 (1438.6) -> 1359.7 (1438.6) MB, 1579.5 / 0.0 ms [allocation failure] [scavenge might not succeed].
48738329 ms: Mark-sweep 1359.7 (1438.6) -> 1368.7 (1422.6) MB, 1885.0 / 0.0 ms [last resort gc].
48740025 ms: Mark-sweep 1368.7 (1422.6) -> 1377.7 (1422.6) MB, 1695.0 / 0.0 ms [last resort gc].
<--- JS stacktrace --->
==== JS stack trace =========================================
Security context: 0x12ba820cfb51 <JS Object>
1: stringify(aka stringify) [native json.js:178] [pc=0x12d240955b57] (this=0x12ba82004381 <undefined>,E=0x162cbe055041 <an Object with map 0x8ecabcc95a1>,F=0x12ba82004381 <undefined>,S=0x12ba82004381 <undefined>)
2: arguments adaptor frame: 1->3
3: response [/usr/local/lib/node_modules/xo-server/node_modules/json-rpc-protocol/dist/format.js:~54] [pc=0x12d240cc1301] (this=0x1de505db7...
FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
1: node::Abort() [node]

In that case, you need to increase the memory allocated to the XOA VM (from 2GB to 4 or 8 GB), and then update the service file (/etc/systemd/system/xo-server.service) to increase the allocated memory to xo-server itself:

- ExecStart=/usr/local/bin/xo-server
+ ExecStart=/usr/local/bin/node --max-old-space-size=8192 /usr/local/bin/xo-server

Behind a transparent proxy

If your are behind a transparent proxy, you'll probably have issues with the updater (SSL/TLS issues).

First, run the following commands:

$ echo NODE_TLS_REJECT_UNAUTHORIZED=0 >> /etc/xo-appliance/env
$ npm config -g set strict-ssl=false

Then, restart the updater with systemctl restart xoa-updater.

Updating SSL self-signed certificate

If the provided certificate is expired, you may want to create a new one.

Connect to your appliance via SSH, then as root execute these commands:

$ cd /etc/ssl
$ cp server.crt server.crt.old
$ cp server.key server.key.old
$ openssl req -x509 -newkey rsa:2048 -keyout server.key -out server.crt -nodes -days 360
$ systemctl restart xo-server.service

XO configuration

The system logs are visible by using this command:

$ tail -f /var/log/syslog

You can read more about logs in the dedicated chapter.

Ghost tasks

If you have ghost tasks accumulating in your XenOrchestra you can try the following actions in order:

  1. refresh the web page
  2. disconnect and reconnect the Xen pool/server owning the tasks
  3. restart the XenAPI Toolstack of the XenServer master
  4. restart xo-server

Redownload and rebuild all the packages

If a package disappears due to a build problem or human error, you can redownload them using the updater:

  1. rm /var/lib/xoa-updater/update.json
  2. xoa-updater --upgrade

We'll have a xoa-updater --force-reinstall option soon, to do this automatically

Reset XO configuration

If you have problems with your xo-server configuration, you can reset the database. This operation will delete all your configured users and servers:

  1. redis-cli
  3. systemctl restart xo-server.service

You can now log in with and admin password.

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