问题描述
我正在 webvirtcloud 之上构建项目（webvirtcloud 使用 libvirt-python）。
我有几个线程。它们中的每一个都通过 revertToSnapshot 方法恢复不同的虚拟机 (VM)。如果有 3 个线程，那么一切都很顺利。如果有超过 3 个线程，则在每个线程中大约 7 秒后 revertToSnapshot 失败并出现异常 libvirt: XML-RPC error: Cannot recv data: Connection reset by peer。需要注意的是，尽管 revertToSnapshot 方法失败，还原过程仍在继续，VM 将被还原。
我尝试与 10 个不同的 VM 创建 10 个连接，因此 获取 VM 的状态。我的目的是检查我是否可以创建 10 个同时连接。运行正常。
我尝试在每个线程中创建新连接。实现看起来像：
def main():
...
# This is main thread code snippet
t = threading.Thread(thread_job_funk,(arg1,agr2,))
t.start()
...
def thread_job():
...
connection = wvmInstance(host,login,passwd,conn,vname)
connection.snapshot_revert("snapshot_name")
...
我还尝试创建一个连接并在每个线程中使用它（是的，由于 libvirt python 绑定描述，这是合法的）。实现看起来像：
vm_host_connection = wvmConnect(ip_addr,password,connection_type)
def main():
...
# This is main thread code snippet
t = threading.Thread(thread_job_funk,))
t.start()
...
def thread_job():
...
global vm_host_connection
vir_domain_connection = vm_host_connection .get_instance(instance_name)
snapshot = vir_domain.snapshotLookupByName(snapshot_name,0)
vir_domain.revertToSnapshot(snapshot,0)
...
然后我尝试查看 libvirtd（主机上的 libvirt 守护程序）日志以获取连接到 keepalive 机制的消息，我没有发现任何消息。我重现问题期间的 Keepalive 日志：
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,client=0xxxxxxxxxxxx2,msg=0xxxxxxxxxxxx3
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx4
info : virKeepAliveTimerInternal:136 : RPC_KEEPALIVE_TIMEOUT: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 countToDeath=5 idle=5
debug : virKeepAliveMessage:104 : Sending keepalive request to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,client=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxx13
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:395 : Got keepalive request from client 0xxxxxxxxxxxx5
debug : virKeepAliveMessage:104 : Sending keepalive response to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxxx9
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:400 : Got keepalive response from client 0xxxxxxxxxxxx5
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx7
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx8
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx9
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxx10
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx8
info : virKeepAliveTimerInternal:136 : RPC_KEEPALIVE_TIMEOUT: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 countToDeath=5 idle=5
debug : virKeepAliveMessage:104 : Sending keepalive request to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxx11
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:395 : Got keepalive request from client 0xxxxxxxxxxxx5
debug : virKeepAliveMessage:104 : Sending keepalive response to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxx12
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:400 : Got keepalive response from client 0xxxxxxxxxxxx5
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxx12
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx4
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx7
info : virKeepAliveTimerInternal:136 : RPC_KEEPALIVE_TIMEOUT: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 countToDeath=5 idle=5
debug : virKeepAliveMessage:104 : Sending keepalive request to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxx13
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx3
info : virKeepAliveTimerInternal:136 : RPC_KEEPALIVE_TIMEOUT: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 countToDeath=5 idle=5
debug : virKeepAliveMessage:104 : Sending keepalive request to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxxx8
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:395 : Got keepalive request from client 0xxxxxxxxxxxx5
debug : virKeepAliveMessage:104 : Sending keepalive response to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxx11
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:400 : Got keepalive response from client 0xxxxxxxxxxxx5
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0x5585245c7680
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:395 : Got keepalive request from client 0xxxxxxxxxxxx5
debug : virKeepAliveMessage:104 : Sending keepalive response to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxx10
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:400 : Got keepalive response from client 0xxxxxxxxxxxx5
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0xxxxxxxxxxxx9
info : virKeepAliveTimerInternal:136 : RPC_KEEPALIVE_TIMEOUT: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 countToDeath=5 idle=5
debug : virKeepAliveMessage:104 : Sending keepalive request to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxxx7
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:400 : Got keepalive response from client 0xxxxxxxxxxxx5
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx1,msg=0x55852460af60
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=1
debug : virKeepAliveCheckMessage:395 : Got keepalive request from client 0xxxxxxxxxxxx5
debug : virKeepAliveMessage:104 : Sending keepalive response to client 0xxxxxxxxxxxx5
info : virKeepAliveMessage:107 : RPC_KEEPALIVE_SEND: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:374 : ka=0xxxxxxxxxxxx5,msg=0xxxxxxxxxxxx4
info : virKeepAliveCheckMessage:391 : RPC_KEEPALIVE_RECEIVED: ka=0xxxxxxxxxxxx5 client=0xxxxxxxxxxxx5 prog=xxxxxxxxx5 vers=1 proc=2
debug : virKeepAliveCheckMessage:400 : Got keepalive response from client 0xxxxxxxxxxxx5
然后我尝试查找 libvirtd 的错误和警告，并且在重现问题时没有任何错误或警告。
当线程超过 3 个时，为什么方法会失败？
注意事项：
- snapshot_revert 的内部使用 libvirt-python 的 revertToSnapshot 方法。
- 据我所知，webvirtcloud 是使用 libvirt-python 构建的
P.S.：请随时询问任何其他信息。
解决方法
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