The corresponding log file of each Compute service is stored in the /var/log/nova/ directory of the host on which each service runs.

Log files used by Compute services

Log file	Service name (CentOS/Fedora/openSUSE/Red Hat Enterprise Linux/SUSE Linux Enterprise)	Service name (Ubuntu/Debian)
api.log	openstack-nova-api	nova-api
cert.log The X509 certificate service (openstack-nova-cert/nova-cert) is only required by the EC2 API to the Compute service.	openstack-nova-cert	nova-cert
compute.log	openstack-nova-compute	nova-compute
conductor.log	openstack-nova-conductor	nova-conductor
consoleauth.log	openstack-nova-consoleauth	nova-consoleauth
network.log The nova network service (openstack-nova-network/nova-network) only runs in deployments that are not configured to use the Networking service (neutron).	openstack-nova-network	nova-network
nova-manage.log	nova-manage	nova-manage
scheduler.log	openstack-nova-scheduler	nova-scheduler