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Linux,Windows,serwer, i tak dalej ;)

Centos 6/7 virtual machines and Production Checkpoints in Hyper-V 2016.

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As we may know – Microsoft introduced new way of doing snapshots/checkpoints in Hyper-V 2016. However term „production” is misleading, implying Standard checkpoints are not production ready – which is simply not true.
The biggest difference is that Production checkpoints are mostly used with VSS-aware applications (like MS SQL/Exchange, MS Windows itself) allowing them to flush/sync/commit changes to filesystem.

As a major difference – production checkpoints don’t save memory or cpu state, starting always with machine powered off after restore.

You can choose which way you want to do your snapshots here:

Selection_999(411)

Windows-based virtual machines have supported this since previous versions of integration services (2012 R2, 8/8.1) and from the start in case of Windows 2016/10. What about Linux-based, Centos 6/7 machines?

When installed out of the box, without any additional packages, trying to do a production snapshot of Centos 7 (with all updates) we got something like this:

Selection_999(410)

Quick how-to.

  1. If youre using external LIS (Linux Integration Services) from Microsoft, as an external package – remove it. It’s a piece of crap,  breaking kernels from time to time, packed with ‚latest’ errors and workaround rejected by linux kernel maintainers. It’s really not worth risk to have it installed: 
    yum remove microsoft-hyper-v kmod-microsoft-hyper-v

    or

    yum remove $(yum list installed|grep microsoft)
  2. Check if your Hyper-V offers all Integration Services for this VM.Selection_999(412)
  3. Check  and install hyperv-daemons
     yum info hyperv-daemons

    Available Packages
    Name : hyperv-daemons
    Arch : x86_64
    Version : 0
    Release : 0.29.20160216git.el7
    Size : 4.5 k
    Repo : base/7/x86_64
    Summary : HyperV daemons suite
    URL : http://www.kernel.org
    Licence : GPLv2
    Description : Suite of daemons that are needed when Linux guest : is running on Windows Host with HyperV

    yum install hyperv-daemons -y
  4. Enable and start services
    systemctl enable hypervfcopyd
    systemctl enable hypervkvpd
    systemctl enable hypervvssd
    
    systemctl start hypervkvpd 
    systemctl start hypervvssd 
    systemctl start hypervfcopyd
  5. Check status
    [root@centos7 ~]# systemctl status hypervkvpd
    ● hypervkvpd.service - Hyper-V KVP daemon
     Loaded: loaded (/usr/lib/systemd/system/hypervkvpd.service; static; vendor preset: enabled)
     Active: active (running) since Wed 2017-07-26 02:37:30 CDT; 14s ago
     Main PID: 3478 (hypervkvpd)
     CGroup: /system.slice/hypervkvpd.service
     └─3478 /usr/sbin/hypervkvpd -n
    
    Jul 26 02:37:30 centos7 systemd[1]: Started Hyper-V KVP daemon.
    Jul 26 02:37:30 centos7 systemd[1]: Starting Hyper-V KVP daemon...
    Jul 26 02:37:30 centos7 KVP[3478]: KVP starting; pid is:3478
    Jul 26 02:37:30 centos7 KVP[3478]: KVP LIC Version: 3.1
    [root@centos7 ~]# systemctl status hypervvssd
    ● hypervvssd.service - Hyper-V VSS daemon
     Loaded: loaded (/usr/lib/systemd/system/hypervvssd.service; static; vendor preset: enabled)
     Active: active (running) since Wed 2017-07-26 02:37:30 CDT; 27s ago
     Main PID: 3485 (hypervvssd)
     CGroup: /system.slice/hypervvssd.service
     └─3485 /usr/sbin/hypervvssd -n
    
    Jul 26 02:37:30 centos7 systemd[1]: Started Hyper-V VSS daemon.
    Jul 26 02:37:30 centos7 systemd[1]: Starting Hyper-V VSS daemon...
    Jul 26 02:37:30 centos7 hypervvssd[3485]: Hyper-V VSS: VSS starting; pid is:3485
    Jul 26 02:37:30 centos7 hypervvssd[3485]: Hyper-V VSS: VSS: kernel module version: 129
    [root@centos7 ~]# systemctl status hypervfcopyd
    ● hypervfcopyd.service - Hyper-V FCOPY daemon
     Loaded: loaded (/usr/lib/systemd/system/hypervfcopyd.service; static; vendor preset: disabled)
     Active: active (running) since Wed 2017-07-26 02:37:30 CDT; 44s ago
     Main PID: 3492 (hypervfcopyd)
     CGroup: /system.slice/hypervfcopyd.service
     └─3492 /usr/sbin/hypervfcopyd -n
    
    Jul 26 02:37:30 centos7 systemd[1]: Started Hyper-V FCOPY daemon.
    Jul 26 02:37:30 centos7 systemd[1]: Starting Hyper-V FCOPY daemon...
    Jul 26 02:37:30 centos7 HV_FCOPY[3492]: starting; pid is:3492
    Jul 26 02:37:30 centos7 HV_FCOPY[3492]: kernel module version: 1

    As a result:
    Selection_999(413)
    and in /var/log/messages

    Jul 26 02:43:27 centos7 journal: Hyper-V VSS: VSS: op=FREEZE: succeeded
    
    Jul 26 02:39:25 centos7 systemd: Time has been changed
    
    Jul 26 02:39:25 centos7 journal: Hyper-V VSS: VSS: op=THAW: succeeded

 

Written by marcinbojko

Lipiec 26, 2017 @ 18:05

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