ironic-inspector/doc/source/user/troubleshooting.rst

Troubleshooting

Errors when starting introspection

• Invalid provision state "available"

  In Kilo release with python-ironicclient 0.5.0 or newer Ironic defaults to reporting provision state AVAILABLE for newly enrolled nodes. ironic-inspector will refuse to conduct introspection in this state, as such nodes are supposed to be used by Nova for scheduling. See node states <node_states> for instructions on how to put nodes into the correct state.

Introspection times out

There may be 3 reasons why introspection can time out after some time (defaulting to 60 minutes, altered by timeout configuration option):

1. Fatal failure in processing chain before node was found in the local cache. See Troubleshooting data processing for the hints.
2. Failure to load the ramdisk on the target node. See Troubleshooting PXE boot for the hints.
3. Failure during ramdisk run. See Troubleshooting ramdisk run for the hints.

Troubleshooting data processing

In this case ironic-inspector logs should give a good idea what went wrong. E.g. for RDO or Fedora the following command will output the full log:

sudo journalctl -u openstack-ironic-inspector

(use openstack-ironic-discoverd for version < 2.0.0).

Note

Service name and specific command might be different for other Linux distributions (and for old version of ironic-inspector).

If ramdisk_error plugin is enabled and ramdisk_logs_dir configuration option is set, ironic-inspector will store logs received from the ramdisk to the ramdisk_logs_dir directory. This depends, however, on the ramdisk implementation.

A local cache miss during data processing would leave a message like:

ERROR ironic_python_agent.inspector [-] inspectorerror 400: {"error":{"message":"The following failures happened during running pre-processing hooks:\nLook up error: Could not find a node for attributes {'bmc_address': u'10.x.y.z', 'mac': [u'00:aa:bb:cc:dd:ee', u'00:aa:bb:cc:dd:ef']}"}}

One potential explanation for such an error is a misconfiguration in the BMC where a channel with the wrong IP address is active (and hence detected and reported back by the Ironic Python Agent), but can then not be matched to the IP address Ironic has in its cache for this node.

Troubleshooting PXE boot

PXE booting most often becomes a problem for bare metal environments with several physical networks. If the hardware vendor provides a remote console (e.g. iDRAC for DELL), use it to connect to the machine and see what is going on. You may need to restart introspection.

Another source of information is DHCP and TFTP server logs. Their location depends on how the servers were installed and run. For RDO or Fedora use:

$ sudo journalctl -u openstack-ironic-inspector-dnsmasq

(use openstack-ironic-discoverd-dnsmasq for version < 2.0.0).

The last resort is tcpdump utility. Use something like :

$ sudo tcpdump -i any port 67 or port 68 or port 69

to watch both DHCP and TFTP traffic going through your machine. Replace any with a specific network interface to check that DHCP and TFTP requests really reach it.

If you see node not attempting PXE boot or attempting PXE boot on the wrong network, reboot the machine into BIOS settings and make sure that only one relevant NIC is allowed to PXE boot.

If you see node attempting PXE boot using the correct NIC but failing, make sure that:

1. network switches configuration does not prevent PXE boot requests from propagating,
2. there is no additional firewall rules preventing access to port 67 on the machine where ironic-inspector and its DHCP server are installed.

If you see node receiving DHCP address and then failing to get kernel and/or ramdisk or to boot them, make sure that:

1. TFTP server is running and accessible (use tftp utility to verify),

2. no firewall rules prevent access to TFTP port,

3. SELinux is configured properly to allow external TFTP access,

   If SELinux is neither permissive nor disabled, you should config tftp_home_dir in SELinux by executing the command :

   $ sudo setsebool -P tftp_home_dir 1

   See the man page for more details.

4. DHCP server is correctly set to point to the TFTP server,

5. pxelinux.cfg/default within TFTP root contains correct reference to the kernel and ramdisk.

Note

If using iPXE instead of PXE, check the HTTP server logs and the iPXE configuration instead.

Troubleshooting ramdisk run

First, check if the ramdisk logs were stored locally as described in the Troubleshooting data processing section. If not, ensure that the ramdisk actually booted as described in the Troubleshooting PXE boot section.

Finally, you can try connecting to the IPA ramdisk. If you have any remote console access to the machine, you can check the logs as they appear on the screen. Otherwise, you can rebuild the IPA image with your SSH key to be able to log into it. Use the dynamic-login or devuser element for a DIB-based build or put an authorized_keys file in /usr/share/oem/ for a CoreOS-based one.

Troubleshooting DNS issues on Ubuntu

Ubuntu uses local DNS caching, so tries localhost for DNS results first before calling out to an external DNS server. When DNSmasq is installed and configured for use with ironic-inspector, it can cause problems by interfering with the local DNS cache. To fix this issue ensure that /etc/resolve.conf points to your external DNS servers and not to 127.0.0.1.

On Ubuntu 14.04 this can be done by editing your /etc/resolvconf/resolv.conf.d/head and adding your nameservers there. This will ensure they will come up first when /etc/resolv.conf is regenerated.

Troubleshooting DnsmasqFilter

When introspection fails and the following error is in ironic-inspector.log

ERROR ironic_inspector.node_cache [-] [node: 651da5a3-4ecb-4214-a87d-139cc7778c05
state starting] Processing the error event because of an exception
<class 'ironic_inspector.pxe_filter.base.InvalidFilterDriverState'>:
The PXE filter driver DnsmasqFilter, state=uninitialized: my fsm encountered an
exception: Can not transition from state 'uninitialized' on event 'sync'
(no defined transition) raised by ironic_inspector.introspect._do_introspect:
ironic_inspector.pxe_filter.base.InvalidFilterDriverState: The PXE filter driver
DnsmasqFilter, state=uninitialized: my fsm encountered an exception:
Can not transition from state 'uninitialized' on event 'sync'
(no defined transition)

restart ironic-inspector.

Running Inspector in a VirtualBox environment

By default VirtualBox does not expose a DMI table to the guest. This prevents ironic-inspector from being able to discover the properties of the a node. In order to run ironic-inspector on a VirtualBox guest the host must be configured to expose DMI data inside the guest. To do this run the following command on the VirtualBox host:

VBoxManage setextradata {NodeName} "VBoxInternal/Devices/pcbios/0/Config/DmiExposeMemoryTable" 1

Note

Replace {NodeName} with the name of the guest you wish to expose the DMI table on. This command will need to be run once per host to enable this functionality.