Link Down.

Link removed

Virtual Switch link failure

Reason: Hardware Failure

Interface Down

(Ref: https://docs.openstack.org/ocata/config-reference/networking/logs.html)

Network interface status, 

High packet drop,

low throughput,

excessive latency or jitter

crc-statistics, fabric-link-failure, link-flap, transceiver-power-low

Deployment/Start Failures:

1. Failed to start*
2. Failed to boot*

Post-Deployment/Start failures:

1. Shutdown
2. Crash
3. Hang*
4. Panic

nova-compute.log

nova-api.log

nova-scheduler.log

libvirt.log

qemu/$vm.log

neutron-server.log

glance/cinder - 

flavor

Node and Core-mapping

cpu: per-core utilization

memory

Interfaces statistics - sent, recv, drops

Disk Read/Write

If possible, Infrastructure metrics and syslogs from within the VM should be collected.

Deployment/Start failures can be the first step.

Deployment/Start Failures:

1. Failed to start*
2. Failed to boot*

Post-Deployment/Start failures:

1. Shutdown
2. Crash
3. Hang
4. Panic

• OS layer – syslog, boot.log, kern.log etc.
• Kubernetes Layer – container Logs (/var/log/containers)
• OpenStack Layer – OpenStack service Logs

cpu: per-core utilization

memory

Interfaces statistics - sent, recv, drops

Disk Read/Write

A node failure (hardware failure, OS crash, etc)

A) node network connectivity failure

B) nova service failure

C) Failure of other OpenStack services

/var/log/nova/nova-compute.log
(To ensure that it has successfully connected to the AMQP server
Ref: https://docs.openstack.org/operations-guide/ops-maintenance-compute.html)

(Ref: https://docs.openstack.org/operations-guide/ops-logging.html)

A) node network connectivity failure

1. management network
2. VMs communication network
3. storage network

B) nova service failure (e.g., process crashed) -- detected and restarted by a local watchdog process

1. compute
2. volume
3. network
4. scheduler
5. api.

C) Failure of other OpenStack services -- N/A, assuming redundant/highly available configuration

1. Glance
2. Keystone

Interfaces statistics - sent, recv, drops

Hypervisor Metrics, Nova Server Metrics, Tenant Metrics, Message Queue Metrics

Keystone  and Glance Metrics

Application Log i.e. If it is Apache then logs of Apache

(/var/log/apache2)