openstack instance err:”Exeeded maximum number of retries”

0, the error instance log show:


1, check the /var/log/nova/nova-compute.log, the log show:


maybe the device cannot support the kvm or not have the modue

reference from : 



2, install the qemu-kvm


3, restart the nova-compute container 

and relaunch a new instance, it still show the same err:"Exeeded maximum number of retries", but the nova-compute.log show difference, there is no permission access kvm character device


reference from: ""

4, and the change the permission to 666 /dev/kvm


5, relaunch the instance and it works

sed in MacOS

1, use G command to add a new line

2, use parameter in substitution command

dig +short

sudo cp /etc/pf.conf /etc/pf.conf_bak`date +%Y%m%d%H%M%S`

output_cmd="pass out proto tcp from any to ${1} port ${2}"

sudo sed -i '' -e '${G;}' /etc/pf.conf

sudo sed -i '' -e "$ s/$/$output_cmd/" /etc/pf.conf

sudo pfctl -evf /etc/pf.conf