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docs: Move and update Background page

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Timothée Ravier 2020-09-30 18:11:03 +02:00 committed by OpenShift Merge Robot
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docs/manual/background.md → docs/background.md
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@ -1,3 +1,13 @@
---
nav_order: 2
---
# Background
{: .no_toc }
1. TOC
{:toc}
## Package systems versus image systems ## Package systems versus image systems
Broadly speaking, software update systems for operating systems tend Broadly speaking, software update systems for operating systems tend
@ -5,27 +15,27 @@ to fall cleanly into one of two camps: package-based or image-based.
### Package system benefits and drawbacks ### Package system benefits and drawbacks
Benefits Benefits:
* Highly dynamic, fast access to wide array of software * Highly dynamic, fast access to wide array of software
* State management in `/etc` and `/var` is well understood * State management in `/etc` and `/var` is well understood
* Can swap between major/minor system states (`apt-get upgrade` is similar to `apt-get dist-upgrade`) * Can swap between major/minor system states (`apt-get upgrade` is similar to `apt-get dist-upgrade`)
* Generally supports any filesystem or partition layout * Generally supports any filesystem or partition layout
Drawbacks Drawbacks:
* As package set grows, testing becomes combinatorially more expensive * As package set grows, testing becomes combinatorially more expensive
* Live system mutation, no rollbacks * Live system mutation, no rollbacks
### Image benefits and drawbacks ### Image benefits and drawbacks
Benefits Benefits:
* Ensures all users are running a known state * Ensures all users are running a known state
* Rollback supported * Rollback supported
* Easier to verify system integrity * Easier to verify system integrity
Drawbacks Drawbacks:
* Many image systems have a read-only `/etc`, and writable partitions elsewhere * Many image systems have a read-only `/etc`, and writable partitions elsewhere
* Must reboot for updates * Must reboot for updates