40 lines
1.4 KiB
Markdown
40 lines
1.4 KiB
Markdown
## Administering an rpm-ostree based system
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At the moment, there are three primary commands to be familiar with on
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an rpm-ostree based system. Remember that `atomic` is an alias for
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`rpm-ostree`. The author tends to use the former on client systems,
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and the latter on compose servers.
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```
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# atomic status
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```
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Will show you your deployments, in the order in which they will appear
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in the bootloader. The `*` shows the currently booted deployment.
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```
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# atomic upgrade
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```
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Will perform a system upgrade, creating a *new* chroot, and set it as
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the default for the next boot. You should use `systemctl reboot`
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shortly afterwards.
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```
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# atomic rollback
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```
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By default, the `atomic upgrade` will keep at most two bootable
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"deployments", though the underlying technology supports more.
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## Filesystem layout
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The only writable directories are `/etc` and `/var`. In particular,
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`/usr` has a read-only bind mount at all times. Any data in `/var` is
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never touched, and is shared across upgrades.
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At upgrade time, the process takes the *new default* `/etc`, and adds
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your changes on top. This means that upgrades will receive new
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default files in `/etc`, which is quite a critical feature.
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## Operating system changes
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* The RPM database is stored in `/usr/share/rpm`, and is immutable.
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* A package [nss-altfiles](https://github.com/aperezdc/nss-altfiles) is required,
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and the system password database is stored in `/usr/lib/passwd`. Similar
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for the group database.
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