mailcow-dockerized-docs/docs/requirements.md

4,2 KiB

Before you run mailcow: dockerized, there are a few requirements that you should check:

Minimum System Resources

Please make sure that your system has at least the following resources:

Resource mailcow: dockerized
CPU 1 GHz
RAM                     1 GiB        
Disk 5 GiB
System Type x86_64

Firewall & Ports

Please check if any of mailcow's standard ports are open and not blocked by other applications:

# netstat -tulpn | grep -E -w '25|80|110|143|443|465|587|993|995'

If this command returns any results please remove or stop the application running on that port. You may also adjust mailcows ports via the mailcow.conf configuration file.

Default Ports

If you have a firewall already up and running please make sure that these ports are open for incomming connections:

Service Protocol Port Container Variable
Postfix SMTP TCP 25 postfix-mailcow ${SMTP_PORT}
Postfix SMTPS TCP 465 postfix-mailcow ${SMTPS_PORT}
Postfix Submission TCP 587 postfix-mailcow ${SUBMISSION_PORT}
Dovecot IMAP TCP 143 dovecot-mailcow ${IMAP_PORT}
Dovecot IMAPS TCP 993 dovecot-mailcow ${IMAPS_PORT}
Dovecot POP3 TCP 110 dovecot-mailcow ${POP_PORT}
Dovecot POP3S TCP 995 dovecot-mailcow ${POPS_PORT}
Dovecot ManageSieve TCP 4190 dovecot-mailcow ${SIEVE_PORT}
HTTP(S) TCP 80/443 nginx-mailcow ${HTTP_PORT} / ${HTTPS_PORT}

Date and Time

To ensure that you have the correct date and time setup on your system, please check the output of timedatectl status:

$ timedatectl status
      Local time: Sat 2017-05-06 02:12:33 CEST
  Universal time: Sat 2017-05-06 00:12:33 UTC
        RTC time: Sat 2017-05-06 00:12:32
       Time zone: Europe/Berlin (CEST, +0200)
     NTP enabled: yes
NTP synchronized: yes
 RTC in local TZ: no
      DST active: yes
 Last DST change: DST began at
                  Sun 2017-03-26 01:59:59 CET
                  Sun 2017-03-26 03:00:00 CEST
 Next DST change: DST ends (the clock jumps one hour backwards) at
                  Sun 2017-10-29 02:59:59 CEST
                  Sun 2017-10-29 02:00:00 CET

The lines NTP enabled: yes and NTP synchronized: yes indicate wether you have NTP enabled and if it's syncronized.

To enable NTP you need to run the command timedatectl set-ntp true. You also need to edit your /etc/systemd/timesyncd.conf:

# vim /etc/systemd/timesyncd.conf
[Time]
Servers=0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org