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Limit user resources on *geniux* #126

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Limit user resources on *geniux* #126

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Commits on May 11, 2020

  1. Limit user resources on *geniux* 

    By ignorance and inattention, users run calculations on our gateway
server *geniux*, affecting all other users.

Prevent that technically, by limitting the resources to one CPU and ten
percent of the memory. See systemd.resource-control(5) for more details.

The current resource limits for user id 133 can be checked With
`systemd-cgls` and `systemctl status user-133.slice`.

Users can still cripple the system with high IO and network load.
    @pmenzel
    pmenzel committed May 11, 2020
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  2. systemd: Exclude *root* from resource limits application 

    Do not apply the user resource limits to user *root*.
    @pmenzel
    pmenzel committed May 11, 2020
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  3. systemd: Fix maximum memory usage to 3G for users on *geniux* 

    Absolute values are preferred by some, so arbitrarily choose 3 GB.
(Before it would have been around 6 GB on *geniux*, which seems
excessive.)
    @pmenzel
    pmenzel committed May 11, 2020
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