Host upgrade best practices

Community Support
1

Hello,

what is the suggested workflow for host upgrade, for example for installing a security patch (say, CVE-2016-3710 :-)? Let’s say you want to “yum update” all your hosts, and the upgrade contains the kernel package and a recommendation to restart all the qemu processes. How would you do it, if your ONe cloud contains uptime-sensitive VMs? Are there any pre-installed scripts for gradually rebooting all your cloud?

Thanks!

2

Hello Yenya, I do it manualy. Live migrate all VM from one node to others, yum update, reboot… LIve migrate all VM from second node and so on. You can write some scripts, which do this automaticaly.

4

Hi,

You can also use the ‘onehost flush’ command from the CLI:
http://docs.opennebula.org/4.14/administration/hosts_and_clusters/host_guide.html#enable-disable-and-flush

5

Carlos Martín forum@opennebula.org writes:

Hi,

Hello,

You can also use the ‘onehost flush’ command from the CLI:
Managing Hosts — OpenNebula 4.14.2 documentation

I forgot this one.

Is it a live migrate?

Regards.

Daniel Dehennin
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6

This is configured in sched.conf, LIVE_RESCHEDS attribute:
http://docs.opennebula.org/4.14/administration/references/schg.html

7

Carlos Martín forum@opennebula.org writes:

This is configured in sched.conf, LIVE_RESCHEDS attribute:
Scheduler — OpenNebula 4.14.2 documentation

Thanks a lot.
Daniel Dehennin
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