On Fri, Oct 5, 2018 at 4:19 PM Per Jessen wrote:

Roger Oberholtzer wrote:

...

On a local network, what would be the preferred way for one system to shut down or reboot another system? Something over the network.

ssh target 'shutdown' or 'reboot' ?

That's what I would think. I am just curious if I am missing some detail. I think this will be in a systemd service that mimics whatever the user is doing locally. A local reboot does a remote boot. A local shutdown does a remote shutdown. Or something like that. -- Roger Oberholtzer -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

Roger Oberholtzer wrote:

On Fri, Oct 5, 2018 at 4:19 PM Per Jessen wrote:

...

Roger Oberholtzer wrote:

...

On a local network, what would be the preferred way for one system to shut down or reboot another system? Something over the network.

ssh target 'shutdown' or 'reboot' ?

That's what I would think. I am just curious if I am missing some detail.

I do the above frequently - for remote systems, for local.

I think this will be in a systemd service that mimics whatever the user is doing locally. A local reboot does a remote boot. A local shutdown does a remote shutdown.

Or something like that.

I guess you have additional requirements - a master-slave setup? -- Per Jessen, Zürich (18.9°C) http://www.hostsuisse.com/ - dedicated server rental in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On 5 Oct 2018, at 19:56, Carlos E. R.

However, if there is a graphical session in that computer, with someone there, his session will die suddenly, no data saved at all. Same if there are remote users.

I remember that some commands give a message to everybody that poweroff is coming in 5 minutes. But I do not see it in "man halt" or "man poweroff".

Maybe "shutdown".

shutdown [OPTIONS...] [TIME] [WALL...]

I'm unsure of "systemctl" command to do the same and properly. Maybe switch to level 0. But I do not trust it, in my machine switch to level 3 hang

The remote system runs services that the master needs. No one is logged in. When the master goes away the services are no longer needed. We used to do diskless stuff with no changes to the image. Then it could just be powered off. But sometimes that setup is not feasible. I would like a similar solution for shutting down a Windows system. We are sometimes forced to add one to the mix. Sigh. — Roger -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

Peter Suetterlin wrote:

Roger Oberholtzer wrote:

...

ssh? I have played with rexec/rcmd and such before. I do not need anything fancy. But a password (exchanged keys perhaps) is needed.

That's what we use here for all our slave copmuters (running camera daemons for data acquisition etc.):

ssh -f -o ConnectTimeout=1 root@<target> poweroff

You'll need the proper keys installed in authorized_keys on the slave (unless you want to type the password permanently), but probably that is in place already anyhow?

For powerup we use ether-wake.

I was also going to suggest using IPMI, but I wasn't sure if Roger had that option. -- Per Jessen, Zürich (14.9°C) http://www.dns24.ch/ - your free DNS host, made in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

Roger Oberholtzer wrote:

On Tue, Oct 9, 2018 at 8:34 AM Per Jessen wrote:

...

I was also going to suggest using IPMI, but I wasn't sure if Roger had that option.

As in :)

IPMI: The most dangerous protocol you've never heard of

Depending on your setup, keep it on a separate VLAN. We use it to let customers have serial conosle and power-on/off control of their leased machines, as well as for STONITH in two high-availability clusters. -- Per Jessen, Zürich (14.8°C) http://www.cloudsuisse.com/ - your owncloud, hosted in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org