This commit adds a new gRPC function Status to CacheService. VMCache
server will reply the status of VMCache server.
Factory destroy will call gRPC Status to get the status of VMCache
server and output it when VMCache is enabled.
Fixes: #1395
Signed-off-by: Hui Zhu <teawater@hyper.sh>
VMCache server just can be stopped by ctrl-c without current commit.
This commit adds a new gRPC function Quit to CacheService. VMCache
server will stop by itself after 1 second when Quit is called.
Factory destroy will call gRPC Quit when VMCache is enabled.
Fixes: #1395
Signed-off-by: Hui Zhu <teawater@hyper.sh>
VMCache is a new function that creates VMs as caches before using it.
It helps speed up new container creation.
The function consists of a server and some clients communicating
through Unix socket. The protocol is gRPC in protocols/cache/cache.proto.
The VMCache server will create some VMs and cache them by factory cache.
It will convert the VM to gRPC format and transport it when gets
requestion from clients.
Factory grpccache is the VMCache client. It will request gRPC format
VM and convert it back to a VM. If VMCache function is enabled,
kata-runtime will request VM from factory grpccache when it creates
a new sandbox.
VMCache has two options.
vm_cache_number specifies the number of caches of VMCache:
unspecified or == 0 --> VMCache is disabled
> 0 --> will be set to the specified number
vm_cache_endpoint specifies the address of the Unix socket.
This commit just includes the core and the client of VMCache.
Currently, VM cache still cannot work with VM templating and vsock.
And just support qemu.
Fixes: #52
Signed-off-by: Hui Zhu <teawater@hyper.sh>
