Hello,
I am searching for the libvirt operations for relocating LXC (system or
application) containers. LXC relocation mechanism is done by checkpoint /
restart. I went over libvirt API documentation and found the following
methods:
virDomainSave that receives a domain and path to state file. The method
saves domain's memory contents into a disk file.
virDomainRestore that receives a domain and path to state file. The method
restores the domain from the state file created by save operation.
Are these the proper methods to use for LXC relocation? I assume I can also
use the corresponding operations via virsh (save / restore)..
>From looking into lxcDriver object (defined under /src/lxc/xlc_driver.c in
libvirt server source) I can see that NULLs are set in save and restore
methods. Does that mean that there is no support for saving and restoring
Linux containers? Is there a libvirt patch beyond the kernel patch that
needs to be applied?
I am using libvirt 0.7.5 and kernel 2.6.31
/* Function Tables */
static virDriver lxcDriver = {
VIR_DRV_LXC, /* the number virDrvNo */
"LXC", /* the name of the driver */
lxcOpen, /* open */
lxcClose, /* close */
NULL, /* supports_feature */
NULL, /* type */
lxcVersion, /* version */
NULL, /* libvirtVersion (impl. in libvirt.c) */
virGetHostname, /* getHostname */
NULL, /* getMaxVcpus */
nodeGetInfo, /* nodeGetInfo */
lxcGetCapabilities, /* getCapabilities */
lxcListDomains, /* listDomains */
lxcNumDomains, /* numOfDomains */
lxcDomainCreateAndStart, /* domainCreateXML */
lxcDomainLookupByID, /* domainLookupByID */
lxcDomainLookupByUUID, /* domainLookupByUUID */
lxcDomainLookupByName, /* domainLookupByName */
lxcDomainSuspend, /* domainSuspend */
lxcDomainResume, /* domainResume */
lxcDomainShutdown, /* domainShutdown */
NULL, /* domainSave */
NULL, /* domainRestore */
NULL, /* domainMigratePrepare */
NULL, /* domainMigratePerform */
NULL, /* domainMigrateFinish */
...
...
Thanks,
- Avi
