Re: [atomic-devel] update without full reboot

[Colin Walters <walters verbum org>]

On Fri, Aug 5, 2016, at 12:55 PM, Vasiliy Tolstov wrote:

Thanks,do you have any plans to do this?

I just tested this on the latest CentOS AH, and it worked:

First, deploy the older version:

# atomic host status

...                                

* 2016-07-07 21:23:41     7.20160707     cd47a72eb5     centos-atomic-host     centos-atomic-host:centos-atomic-host/7/x86_64/standard

# atomic host deploy 7.20160610

...

# atomic host status                                  

  2016-06-10 13:15:00     7.20160610     3c3786d1dd     centos-atomic-host     centos-atomic-host:centos-atomic-host/7/x86_64/standard

* 2016-07-07 21:23:41     7.20160707     cd47a72eb5     centos-atomic-host     centos-atomic-host:centos-atomic-host/7/x86_64/standard

Now, looking at  /boot/loader/grub.cfg  (or /boot/loader) we can figure out the kernel/initrd:

# kexec -l /boot/ostree/centos-atomic-host-5f3ab890b70e1a7a1eaa4a698fb9ad84b34944f79e328f22a2e40c77d8d7b2f6/vmlinuz-3.10.0-327.18.2.el7.x86_64 --initrd /boot/ostree/centos-atomic-host-5f3ab890b70e1a7a1eaa4a698fb9ad84b34944f79e328f22a2e40c77d8d7b2f6/initramfs-3.10.0-327.18.2.el7.x86_64.img --command-line="no_timer_check console=tty1 console=ttyS0,115200n8 crashkernel=auto rd.lvm.lv=atomicos/root root=/dev/mapper/atomicos-root ostree=/ostree/boot.1/centos-atomic-host/5f3ab890b70e1a7a1eaa4a698fb9ad84b34944f79e328f22a2e40c77d8d7b2f6/0"

# kexec -e

...

$ vagrant ssh

# atomic host status

  TIMESTAMP (UTC)         VERSION        ID             OSNAME                 REFSPEC                                                     

* 2016-06-10 13:15:00     7.20160610     3c3786d1dd     centos-atomic-host     centos-atomic-host:centos-atomic-host/7/x86_64/standard     

  2016-07-07 21:23:41     7.20160707     cd47a72eb5     centos-atomic-host     centos-atomic-host:centos-atomic-host/7/x86_64/standard     

Anyways I filed https://github.com/ostreedev/ostree/issues/435 to track adding this.