On 04.01.2016 01:19, BYEONG-GI KIM wrote: > Hello. I'm a new getting started to learn the libvirt API. > > I've tried to find APIs which retrieve resource metrics such as cpu, disk, > memory, and network I/O usages, but I could find few related thing; I was > intended to use libvirt-Java binding first, it seems I'd be better to use > the others like Python binding or C API though. The Java binding API is > likely to provide very limited API list comparing with the above APIs so > far. > > So, I'd like to know which APIs can retrieve that resources from VMs. I > don't care about the language, but I really want to know whether such APIs > even exists or not. > > As far as I know, cpu, memory, and network I/O seems being provided, but > I'm not sure disk usage per VMs can be obtained via libvirt API. I'm not sure what do you mean by 'disk usage'. You mean like 'how many bytes are used/free on a disk'? If so, I'm not sure libvirt can help. I mean it's dependent on guest configuration and you should use 'df' ran from within guest to retrieve that info. It falls out of libvirt's scope. If you, however, mean disk I/O - this can be obtained via virDomainBlockStatsFlags() API. Michal

2016-01-04 16:33 GMT+03:00 BYEONG-GI KIM <kimbyeonggi(a)gmail.com&gt;: > hank you for the reply! > > I used the term "disk usage" as what you mentioned first; the information > which can be retrieved via 'df' command on linux system... > > I'll then have to consider different approach to do what I want. > > Anyway, thanks again for your great help. > > Best regards You can install under guest vm qemu-guest-agent and get info from it. -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru

On 04.01.2016 17:59, Vasiliy Tolstov wrote: > 2016-01-04 16:33 GMT+03:00 BYEONG-GI KIM <kimbyeonggi(a)gmail.com&gt;: >> hank you for the reply! >> >> I used the term "disk usage" as what you mentioned first; the

>> which can be retrieved via 'df' command on linux system... >> >> I'll then have to consider different approach to do what I want. >> >> Anyway, thanks again for your great help. >> >> Best regards > > You can install under guest vm qemu-guest-agent and get info from it. > I am afraid qemu-guest-agent won't be much help here. I mean it has no API for disk usage statistics nor API for executing arbitrary commands. Michal

On 01/04/2016 11:59 AM, Vasiliy Tolstov wrote: > 2016-01-04 16:33 GMT+03:00 BYEONG-GI KIM <kimbyeonggi(a)gmail.com&gt;: > >> hank you for the reply! >> >> I used the term "disk usage" as what you mentioned first; the information >> which can be retrieved via 'df' command on linux system... >> >> I'll then have to consider different approach to do what I want. >> >> Anyway, thanks again for your great help. >> >> Best regards >> > You can install under guest vm qemu-guest-agent and get info from it. > > Another alternative would be to use the libguestfs tools to examine the disk in read-only mode (be sure not to use read/write mode on an image that's currently in use by its guest!). This would *not* be efficient to do very frequently, but would be okay if done occasionally.