Why creating vm very slow?

asked 2016-09-25 02:19:24 -0500

kramer gravatar image

updated 2016-09-25 02:25:43 -0500

I run a openstack mitaka on CentOS7 with 3 nodes. One controller and two compute.

Sometimes the creation of VM is very slow. It tooks about 3 minutes.

This usually happen when I create a subnet and connect it with a router. If I create VM on this kinds of subnet. It will be slow, otherwise it will be very smooth.

To find out why, I compared the message log of two instance. One is created fast and one is slow.

I noticed that the slow log have one entry.

Auth.priv.info. dropbear running in the background

The timestamp of this entry is 3 minutes later than the last entry.

So I guess may be the dropbear is why the instance start slow. I did some google, it looks like the dropbear is un SSHD program. Then why it is taking 3 minutes to start?

I can not find the log for dropbear

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