chg: [new] Added quick FAQ (WiP) and Requirements draft.

SUMMARY.md

@@ -2,6 +2,7 @@
 
 * [Book Convention](book-convention/README.md)
 * [Quick Start](quick-start/README.md)
+* [Requirements](requirements/README.md)
 * [Get Your Instance](get-your-instance/README.md)
 * [General Layout](general-layout/README.md)
 * [General Concepts](general-concepts/README.md)
@@ -24,4 +25,5 @@
 * [Synchronisation/Sharing](sharing/README.md)
 * [ZeroMQ - MISP publish-subscribe](misp-zmq/README.md)
 * [Translations - i18n & l10n](translation/README.md)
+* [FAQ](faq/README.md)
 * [Appendices](appendices/README.md)

faq/README.md

@@ -0,0 +1,17 @@
+# Frequently Asked Questions
+
+The following page hosts most frequently asked questions as seen on our [issues](https://github.com/MISP/issues) and [gitter](https://gitter.im/MISP/MISP).
+
+## permission issues
+
+https://misp.github.io/MISP/INSTALL.ubuntu1804/#5-set-the-permissions
+fig1
+
+## Update MISP fails
+
+fig2
+
+### error: pathspec 'app/composer.json' did not match any file(s) known to git
+
+This is not an error and can be ignore. Nothing will be impacted by this.
+

requirements/README.md

@@ -0,0 +1,26 @@
+# MISP Instance requirements
+
+## Intro
+
+There are various ways you can run a MISP instance.
+
+- Virtualized with docker/ansible/packer etc
+- VMware/Virtualbox/Xen etc
+- Dedicated hardware
+- Road warrior setups
+- Air-gapped setups
+
+Whilst there is never an ultimate answer to what specifications a system needs, we try to give an approximate answer depending on your use case.
+
+## The biggie
+
+Having millions of events with millions of attributes (indicators) will eventually result in sub-par performance.
+Ideally you have millions of attributes and thousands of events. But this also depends on how you ingest the data.
+With millions of attributes a bottleneck could be the correlation engine.
+Especially if you have many duplicates in your events. (Use the feed matrix to see if feeds are massively overlapping)
+
+### Tool assisted sizing
+
+During a hackathon [misp-sizer](https://www.misp-project.org/MISP-sizer/) was conceived. ([code](https://github.com/MISP/MISP-sizer))
+This can give you a very rough estimate and needs some more [improvements](https://github.com/MISP/MISP-sizer/issues).
+