virt January 2021

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5 participants
2 discussions

OS-level virtualization using LXC and systemd-nspawn containers
by Gena Makhomed 28 Jan '21

28 Jan '21

Hello All, OpenVZ 6 in the past was a very popular technology for creating OS-level virtualization containers. But OpenVZ 6 is EOL now (because RHEL 6 / CentOS 6 is EOL) and all OpenVZ 6 users should migrate to some alternatives. I found only two possible free/open source alternatives for OpenVZ 6: - LXC - systemd-nspawn Does anyone use LXC and/or systemd-nspawn containers on RHEL 8 / CentOS 8 for production? What are advantages and disadvantages of each of these technologies? Can you share your experience with LXC and/or systemd-nspawn for RHEL 8 / CentOS 8 operating system on the hardware node? ============================================================ As I understand, LXC is not supported by Red Hat and it should be used on RHEL at its own risk? But, as I understand from the articles - https://access.redhat.com/solutions/1533893 - https://access.redhat.com/articles/2726611 systemd-nspawn is also not supported by Red Hat and should be used at its own risk? So, between LXC and systemd-nspawn is there no difference despite what systemd-nspawn is the part of the RHEL 8 operating system and can be installed on the RHEL 8 from the BaseOS repo? Are there any chances that the situation with support for systemd-nspawn will change in the future and this OS-level virtualization technology will become fully supported in the RHEL 8.x or the RHEL 9.x version? -- Best regards, Gena

3 9

HCI Cluster - CentOS8 to Streams Upgrade Broken
by Jeremey Wise 18 Jan '21

18 Jan '21

I have a test environment. Three node HCI cluster. CentOS8 build. Gluster as file system with standard cockpit deploy of HCI. Converted to CentOS Streams which seemed to go fine. Did a yum update and no issues. Did a reboot.. and now engine will no longer start. So I can no longer start my Virtual machines. I posted as bug https://bugzilla.redhat.com/show_bug.cgi?id=1911910 I posted to CentOS forum https://forums.centos.org/viewtopic.php?f=54&t=76716 but no responses. Can anyone provide means or next step to root cause and or fix? It would take me days to rebuild the entire solution and I really hate to "reload" as a fix.. but after two weeks... nothing changing... just have to find some means to get cluster back working. Thanks. ##### all three servers are looping below events in /var/log/messages ### Jan 7 09:48:03 thor journal[2375050]: ovirt-ha-broker ovirt_hosted_engine_ha.broker.broker.Broker ERROR Failed initializing the broker: [Errno 107] Transport endpoint is not connected: '/rhev/data-center/mnt/glusterSD/thorst.penguinpages.local:_engine/3afc47ba-afb9-413f-8de5-8d9a2f45ecde/ha_agent/hosted-engine.metadata' Jan 7 09:48:03 thor journal[2375050]: ovirt-ha-broker ovirt_hosted_engine_ha.broker.broker.Broker ERROR Traceback (most recent call last):#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/broker/broker.py", line 64, in run#012 self._storage_broker_instance = self._get_storage_broker()#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/broker/broker.py", line 143, in _get_storage_broker#012 return storage_broker.StorageBroker()#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/broker/storage_broker.py", line 97, in __init__#012 self._backend.connect()#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/lib/storage_backends.py", line 408, in connect#012 self._check_symlinks(self._storage_path, volume.path, service_link)#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/lib/storage_backends.py", line 105, in _check_symlinks#012 os.unlink(service_link)#012OSError: [Errno 107] Transport endpoint is not connected: '/rhev/data-center/mnt/glusterSD/thorst.penguinpages.local:_engine/3afc47ba-afb9-413f-8de5-8d9a2f45ecde/ha_agent/hosted-engine.metadata' Jan 7 09:48:03 thor journal[2375050]: ovirt-ha-broker ovirt_hosted_engine_ha.broker.broker.Broker ERROR Trying to restart the broker Jan 7 09:48:03 thor platform-python[2375050]: detected unhandled Python exception in '/usr/share/ovirt-hosted-engine-ha/ovirt-ha-broker' Jan 7 09:48:03 thor abrt-server[2375084]: Not saving repeating crash in '/usr/share/ovirt-hosted-engine-ha/ovirt-ha-broker' Jan 7 09:48:03 thor systemd[1]: ovirt-ha-broker.service: Main process exited, code=exited, status=1/FAILURE Jan 7 09:48:03 thor systemd[1]: ovirt-ha-broker.service: Failed with result 'exit-code'. Jan 7 09:48:04 thor systemd[1]: ovirt-ha-broker.service: Service RestartSec=100ms expired, scheduling restart. Jan 7 09:48:04 thor systemd[1]: ovirt-ha-broker.service: Scheduled restart job, restart counter is at 44569. Jan 7 09:48:04 thor systemd[1]: Stopped oVirt Hosted Engine High Availability Communications Broker. Jan 7 09:48:04 thor systemd[1]: Started oVirt Hosted Engine High Availability Communications Broker. Jan 7 09:48:06 thor systemd[1]: ovirt-ha-agent.service: Service RestartSec=10s expired, scheduling restart. Jan 7 09:48:06 thor systemd[1]: ovirt-ha-agent.service: Scheduled restart job, restart counter is at 22270. Jan 7 09:48:06 thor systemd[1]: Stopped oVirt Hosted Engine High Availability Monitoring Agent. Jan 7 09:48:06 thor systemd[1]: Started oVirt Hosted Engine High Availability Monitoring Agent. Jan 7 09:48:06 thor systemd[1]: Started Session c44598 of user root. Jan 7 09:48:06 thor systemd[1]: session-c44598.scope: Succeeded. Jan 7 09:48:06 thor journal[2375091]: ovirt-ha-agent ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine ERROR Failed to start necessary monitors Jan 7 09:48:06 thor journal[2375091]: ovirt-ha-agent ovirt_hosted_engine_ha.agent.agent.Agent ERROR Traceback (most recent call last):#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/lib/brokerlink.py", line 85, in start_monitor#012 response = self._proxy.start_monitor(type, options)#012 File "/usr/lib64/python3.6/xmlrpc/client.py", line 1112, in __call__#012 return self.__send(self.__name, args)#012 File "/usr/lib64/python3.6/xmlrpc/client.py", line 1452, in __request#012 verbose=self.__verbose#012 File "/usr/lib64/python3.6/xmlrpc/client.py", line 1154, in request#012 return self.single_request(host, handler, request_body, verbose)#012 File "/usr/lib64/python3.6/xmlrpc/client.py", line 1166, in single_request#012 http_conn = self.send_request(host, handler, request_body, verbose)#012 File "/usr/lib64/python3.6/xmlrpc/client.py", line 1279, in send_request#012 self.send_content(connection, request_body)#012 File "/usr/lib64/python3.6/xmlrpc/client.py", line 1309, in send_content#012 connection.endheaders(request_body)#012 File "/usr/lib64/python3.6/http/client.py", line 1264, in endheaders#012 self._send_output(message_body, encode_chunked=encode_chunked)#012 File "/usr/lib64/python3.6/http/client.py", line 1040, in _send_output#012 self.send(msg)#012 File "/usr/lib64/python3.6/http/client.py", line 978, in send#012 self.connect()#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/lib/unixrpc.py", line 74, in connect#012 self.sock.connect(base64.b16decode(self.host))#012FileNotFoundError: [Errno 2] No such file or directory#012#012During handling of the above exception, another exception occurred:#012#012Traceback (most recent call last):#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/agent/agent.py", line 131, in _run_agent#012 return action(he)#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/agent/agent.py", line 55, in action_proper#012 return he.start_monitoring()#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/agent/hosted_engine.py", line 437, in start_monitoring#012 self._initialize_broker()#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/agent/hosted_engine.py", line 561, in _initialize_broker#012 m.get('options', {}))#012 File "/usr/lib/python3.6/site-packages/ovirt_hosted_engine_ha/lib/brokerlink.py", line 91, in start_monitor#012 ).format(t=type, o=options, e=e)#012ovirt_hosted_engine_ha.lib.exceptions.RequestError: brokerlink - failed to start monitor via ovirt-ha-broker: [Errno 2] No such file or directory, [monitor: 'network', options: {'addr': '172.16.100.1', 'network_test': 'dns', 'tcp_t_address': '', 'tcp_t_port': ''}] Jan 7 09:48:06 thor journal[2375091]: ovirt-ha-agent ovirt_hosted_engine_ha.agent.agent.Agent ERROR Trying to restart agent Jan 7 09:48:06 thor systemd[1]: ovirt-ha-agent.service: Main process exited, code=exited, status=157/n/a Jan 7 09:48:06 thor systemd[1]: ovirt-ha-agent.service: Failed with result 'exit-code'. #### Is their a means to start a VM... when oVirt / engine is offline? -- penguinpages

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virt January 2021