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Update prerequisite-system.md

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@ -17,15 +17,27 @@ Before you run **mailcow: dockerized**, there are a few requirements that you sh
Please make sure that your system has at least the following resources:
| Resource | mailcow: dockerized |
| ----------------------- | -------------------------------------------- |
| ----------------------- | ------------------------------------------------ |
| CPU | 1 GHz |
| RAM                     | Minimum 4 GiB + Swap |
| RAM                     | **Minimum** 6 GiB + 1 GiB swap (default config) |
| Disk | 20 GiB (without emails) |
| System Type | x86_64 |
As of today (29th Dec 2019), we recommend using any distribution listed as supported by Docker CE (check https://docs.docker.com/install/). We test on CentOS 7, Debian 9/10 and Ubuntu 18.04.
We recommend using any distribution listed as supported by Docker CE (check https://docs.docker.com/install/). We test on CentOS 7, Debian 9/10 and Ubuntu 18.04/20.04.
ClamAV and Solr are greedy RAM munchers. You can disable them in `mailcow.conf` by settings SKIP_CLAMD=y and SKIP_SOLR=y.
ClamAV and Solr can be greedy with RAM. You may disable them in `mailcow.conf` by settings `SKIP_CLAMD=y` and `SKIP_SOLR=y`.
**Info**: We are aware that a pure MTA can run on 128 MiB RAM. mailcow is a full-grown and ready-to-use groupware with many extras making life easier. mailcow comes with a webserver, webmailer, ActiveSync (MS), antivirus, antispam, indexing (Solr), document scanner (Oletools), SQL (MariaDB), Cache (Redis), MDA, MTA, various web services etc.
A single SOGo worker **can** acquire ~350 MiB RAM before it gets purged. The more ActiveSync connections you plan to use, the more RAM you will need. A default configuration spawns 20 workers.
#### Usage examples
A company with 15 phones (EAS enabled) and about 50 concurrent IMAP connections should plan 16 GB RAM.
6 GiB RAM + 1 GiB swap are fine for most private installations while 8 GiB RAM are recommended for ~5 to 10 users.
We can help to correctly plan your setup as part of our support.
## Firewall & Ports