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In general, the devstack will cost how much of your disk?

asked 2018-07-16 02:43:24 -0500

liaodalin19903 gravatar image

In general, your devstack VM occupy space use how much disk size?

I am install the devstack by $ sudo -u stack ./, get bellow error:

An unexpected error prevented the server from fulfilling your request. (HTTP 500) (Request-ID: req-42b71255-848a-4f18-9d0c-e9602742a4f4)

and I check the vm disk size:

 stack@ldl-VirtualBox:~/devstack$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            980M     0  980M   0% /dev
tmpfs           200M   24M  177M  12% /run
/dev/sda1       7.8G  7.0G  387M  95% /
tmpfs          1000M  244K 1000M   1% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs          1000M     0 1000M   0% /sys/fs/cgroup
tmpfs           200M   80K  200M   1% /run/user/1000

you see the / have used 95%. I just re-run the ./ several times because of some errors. I mean whether failed I should delete something? if your devstack install will occupy so many disk size?

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answered 2018-07-16 02:47:12 -0500

updated 2018-07-16 02:48:55 -0500

I normally allocate 50GB. Your 8GB disk is way too small. Consider that DevStack will create two large files, around 10GB each if I remember well: One that will be used as a physical volume for Cinder, the other for Swift. After that, you need some storage space for the instances that you want to run.

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thank you, Bernd Bausch.

liaodalin19903 gravatar imageliaodalin19903 ( 2018-07-16 02:48:50 -0500 )edit

answered 2018-07-17 18:00:38 -0500

Even 50GB is too small, if you are experimenting with a number of instances. The biggest growth areas are ,Cinder,Nova,block storage log files. Also consider if you are running it as a VM, then you will be running VM's inside Vm's so the performance will take a real hit.

So A running case: Image of centos 1.2GB

launched image ram 2-4GB disk ~10GB PLUS Backing files for the image 1.2GB+10gb Backing file for Swap (whatever you allocated in ram) 2-4GB

shutdown system (18GB), since a shutdown system is retained unless purged, it holds all the data & disk image allocated Yes I know all about the "thin" storage in " Cinder" BUT, what you have to consider is HOW the instance OS works. An OS assumes it is working with a "real disk" and even a thin image can fill up very quickly to its full allocated extent once you start installing other packages.Once an area in a "thin image" is allocated it CANNOT be unallocated even if empty.

Finally DON'T allow any software OS updates inside the openstack system, updates are high maintanance

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answered 2018-07-20 08:59:33 -0500

AndyW gravatar image

I have devstack queens installed (+tacker,heat, networking-sfc, mistral) in an ubuntu16.04 VM (ubuntu18.04 host) (KVM, 4 vCPU, 10G RAM, 30G disk)

If I df the installation

df -h

Filesystem      Size  Used Avail Use% Mounted on

udev            4.8G     0  4.8G   0% /dev
tmpfs           980M   99M  881M  11% /run
/dev/sda1        32G   12G   20G  38% /
tmpfs           4.8G     0  4.8G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           4.8G     0  4.8G   0% /sys/fs/cgroup
cgmfs           100K     0  100K   0% /run/cgmanager/fs
tmpfs           980M     0  980M   0% /run/user/1001

so am using about 12G disk.

in terms of VMs here will only run 2 or 3 cirros VMs (i.e very light VM usage). Use the tiny or nano flavors.

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Asked: 2018-07-16 02:43:24 -0500

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Last updated: Jul 20 '18