Arch Post-Installation Checklist: Difference between revisions

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The second part of the output of {{ic|rspamadm dkim_keygen}} can be directly pasted into a DNS zone if you are running your own server.  If you only have control of your domain name through a 3rd party:
The second part of the output of {{ic|rspamadm dkim_keygen}} can be directly pasted into a DNS zone if you are running your own server.  If you only have control of your domain name through a 3rd party:


{| class="wikitable"
{|
! Type
! Type
! Host
! Host

Revision as of 00:50, 9 November 2019

Passwords & User Creation

Make sure root has a password.

Make sure you have a primary user set up. 

# useradd -m -u <id -ge 1000> -g users -G wheel,games,video,audio,optical,storage,scanner,power <user>
# passwd <user>

/etc/fstab

Time Zone

# ln -sf /usr/share/zoneinfo/<region>/<city> /etc/localtime
# hwclock --systohc

Localization

Un-comment your desired locales in /etc/locale.conf, then run 

locale-gen

If you don't have the default /etc/locale.gen file: 

# rm /etc/locale.gen
# pacman -Syu glibc

Edit /etc/locale.conf as you see fit 

/etc/locale.conf
LANG=en_US.UTF-8
LANGUAGE=en_US
LC_COLLATE=POSIX
LC_MESSAGES=C
LC_CTYPE=en_US.UTF-8
LC_NUMERIC=en_US.UTF-8
LC_TIME=en_US.UTF-8
LC_MONETARY=en_US.UTF-8
LC_PAPER=en_US.UTF-8
LC_NAME=en_US.UTF-8
LC_ADDRESS=en_US.UTF-8
LC_TELEPHONE=en_US.UTF-8
LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=en_US.UTF-8

Set up /etc/vconsole.conf with a keymap and (optionally) a font: 

/etc/vconsole.conf
KEYMAP=us
FONT=Lat2-Terminus16

Initramfs

Look for and edit the following lines: 

/etc/mkinitcpio.conf
MODULES=([amdgpu|bochs_drm|cirrus|i915|nouveau|(nvidia nvidia_modeset nvidia_uvm nvidia_drm)] [ehci_pci usb_storage]>)
HOOKS=(base udev autodetect modconf block [zfs] filesystems keyboard fsck [encrypt] keymap consolefont)
COMPRESSION=lz4

Networking

Host Name

Make sure a host name is set in /etc/hostname

Then edit /etc/hosts 

/etc/hosts
127.0.0.1	localhost.localdomain	locahost
::1		localhost.localdomain	localhost
127.0.1.1	<hostname>.localdomain	<hostname>

Static Addressing

Use systemd-networkd when a machine will use a static address without consulting a DHCP server.

IPv4 Only

/etc/systemd/network/network.network
[Match]
MACAddress=<mac-address>
[Network]
Address=<ipv4-address>/<mask>
DNS=<ipv4-address>
Gateway=<ipv4-address>
LinkLocalAddressing=no
IPv6AcceptRA=no

IPv4 & IPv6

/etc/systemd/network/network.network
[Match]
MACAddress=<mac-address>
[Network]
Address=<ipv6-address>/<mask>
DNS=<ipv6-address>
Gateway=<ipv6-address>
Address=<ipv4-address>/<mask>
DNS=<ipv4-address>
Gateway=<ipv4-address>

Dynamic Addressing

It's preferable to use connman or Network Manager for dynamic addresses as systemd-networkd doesn't play well with interfaces coming and going.

If you'd rather use systemd-networkd for DHCP: 

/etc/systemd/network/network.network
[Match]
MACAddress=<mac-address>
[Network]
DHCP=yes
[DHCP]
UseMTU=true

IPTables Firewall

/etc/iptables/iptables.rules
# SIMPLE STATEFUL FIREWALL
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [100308:88697975]
:TCP - [0:0]
:UDP - [0:0]
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -m conntrack --ctstate NEW -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -p udp -m conntrack --ctstate NEW -j UDP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m conntrack --ctstate NEW -j TCP
-A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
-A INPUT -p tcp -j REJECT --reject-with tcp-reset
-A INPUT -j REJECT --reject-with icmp-proto-unreachable

# OPEN NECESSARY PORTS HERE
-A TCP -p tcp -m tcp --dport 22 -j ACCEPT -m comment --comment "ssh"
-A TCP -p tcp -m tcp --dport 80 -j ACCEPT -m comment --comment "http"
-A TCP -p tcp -m tcp --dport 443 -j ACCEPT -m comment --comment "https"
-A TCP -p tcp -m tcp --dport 465 -j ACCEPT -m comment --comment "smtps"
-A TCP -p tcp -m tcp --dport 587 -j ACCEPT -m comment --comment "starttls"
-A TCP -p tcp -m tcp --dport 873 -j ACCEPT  -m comment --comment "rsync"
-A TCP -p tcp -m tcp --dport 993 -j ACCEPT -m comment --comment "imaps"
-A TCP -p tcp -m tcp --dport 64738 -j ACCEPT -m comment --comment "mumble tcp"
-A UDP -p udp -m udp --dport 64738 -j ACCEPT -m comment --comment "mumble udp"
COMMIT

Packages

Mirror List

Install and use reflector to automate the use and selection of mirrors. 

# pacman -Syu reflector
# reflector -c <country> -p https -l 5 --sort rate --save /etc/pacman.d/mirrorlist

Yay

# pacman -Syu --needed base-devel
# mkdir /var/lib/pacman/aur
# chmod 1777 /var/lib/pacman/aur
$ mkdir /var/lib/pacman/aur/$(whoami)
$ cd /var/lib/pacman/aur/$(whoami)
$ git clone https://aur.archlinux.org/yay.git
$ cd yay
$ makepkg -Ccisr

~/.config/yay/config.json
{
	"aururl": "https://aur.archlinux.org",
	"buildDir": "/var/lib/pacman/aur/$USER",
	"editor": "nano",
	"editorflags": "",
	"makepkgbin": "makepkg",
	"makepkgconf": "",
	"pacmanbin": "pacman",
	"pacmanconf": "/etc/pacman.conf",
	"tarbin": "bsdtar",
	"redownload": "no",
	"rebuild": "no",
	"answerclean": "none",
	"answerdiff": "all",
	"answeredit": "",
	"answerupgrade": "0",
	"gitbin": "git",
	"gpgbin": "gpg",
	"gpgflags": "",
	"mflags": "",
	"sortby": "votes",
	"gitflags": "",
	"removemake": "yes",
	"requestsplitn": 150,
	"sortmode": 0,
	"completionrefreshtime": 7,
	"sudoloop": false,
	"timeupdate": false,
	"devel": true,
	"cleanAfter": false,
	"gitclone": true,
	"provides": true,
	"pgpfetch": true,
	"upgrademenu": true,
	"cleanmenu": true,
	"diffmenu": true,
	"editmenu": true,
	"combinedupgrade": false,
	"useask": false
}

General Utilities

# yay -Syu --needed apache-tools dnsutils fail2ban git rsync openssh pkgfile polkit vim

E-mail

# yay -Syu --needed dovecot postfix redis rspamd swaks

Nginx Web Server and Reverse Proxy

# yay -Syu --needed ca-certificates certbot-nginx mariadb nginx php-fpm

Roundcube Web Mail

# yay -Syu --needed pigeonhole roundcube

Fail2Ban

/etc/fail2ban/jail.local
[DEFAULT]
bantime         = 1d
destemail       = root@bwt.com.de
sender          = fail2ban@bwt.com.de
action          = %(action_mwl)s
/etc/fail2ban/jail.d/sshd.local
[sshd]
enabled         = true
filter          = sshd
banaction       = iptables
backend         = systemd
maxretry        = 5
findtime        = 1d
bantime         = 2w
ignoreip        = 127.0.0.1/8
/etc/fail2ban/jail.d/postfix-ispmail.local
[postfix-ispmail]
enabled         = true
filter          = postfix
port            = smtp,submission
banaction       = iptables
backend         = systemd
maxretry        = 5
findtime        = 1d
bantime         = 2w
ignoreip        = 192.99.246.231/32
/etc/fail2ban/filter.d/postfix-ispmail.conf
[INCLUDES]
before = common.conf

[Definition]
_daemon = postfix(-\w+)?/(?:submission/|smtps/)?smtp[ds]
failregex = ^%(__prefix_line)slost connection after AUTH from \S+\[<HOST>\]$
ignoreregex =

[Init]
journalmatch = _SYSTEMD_UNIT=postfix.service

SSH Setup

Look for and edit the following lines in /etc/ssh/sshd_config: 

/etc/ssh/ssd_config
Port <port>
AddressFamily <any|inet|inet6>
ListenAddress <ip4-address>
ListenAddress <ip6-address>

LogLevel VERBOSE

PermitRootLogin prohibit-password

PubkeyAuthentication yes

PasswordAuthentication no
PermitEmptyPasswords no

ChallengeResponseAuthentication no

UsePAM yes
AllowUsers <space-separated-list-of-users>

AllowAgentForwarding no
AllowTcpForwarding no

Then make sure the sshd service is enabled and running: 

# systemctl enable --now sshd

MariaDB

Data Directory

If you want to put your databases somewhere other than the default /var/lib/mysql: 

# mkdir <dir>
# chown -R mysql:mysql <dir>

tmpfs for tmpdir

The directory used by MariaDB for storing temporary files is named tmpdir. For example, it is used to perform disk based large sorts, as well as for internal and explicit temporary tables.

Create the directory with appropriate permissions: 

# mkdir -pv <dir>
# chown mysql:mysql <dir>

Find the id and gid of the mysql user and group: 

$ id mysql
uid=27(mysql) gid=27(mysql) groups=27(mysql)

Add to your /etc/fstab file. 

/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.

# <file system> <dir>           <type>  <options>                                       <dump> <pass>
...
tmpfs           /srv/sqltmp     tmpfs   rw,noatime,gid=933,uid=993,size=100M,mode=0750  0 0
...

Configuration File

/etc/my.cnf.d/server.cnf
...
[mysqld]
...
datadir=<dir>
skip-networking
tmpdir=<dir>
...

Initial Setup

# mariadb-install-db --user=mysql --basedir=/usr --datadir=<dir></nowiki>

Start the Server

# systemctl enable --now mariadb

Security Settings

# mysql_secure_installation

Create a user: 

$ mysql -u root -p
MariaDB> CREATE USER '<user>'@'localhost' IDENTIFIED BY '<password>';
MariaDB> GRANT ALL PRIVILEGES ON mydb.* TO '<password>'@'localhost';
MariaDB> FLUSH PRIVILEGES;
MariaDB> quit

Redis

Redis is used by several programs, including rspamd (e-mail), NextCloud, OnlyOffice, and Wordpress (optional).

By default, redis is already configured to bind to 127.0.0.1:6379, but the Unix socket is not enabled. 

/etc/redis.conf
...
# Unix socket.
#
# Specify the path for the Unix socket that will be used to listen for
# incoming connections. There is no default, so Redis will not listen
# on a unix socket when not specified.
#
unixsocket /run/redis/redis.sock
unixsocketperm 700
...

You will also need to add users to the redis group so processes can access redis 

# for username in http rspamd; do usermod -G redis ${username}; done

E-mail

Postfix

Create MariaDB Databases for Postfix

MariaDB [(none)]> CREATE DATABASE MAIL;
MariaDB [(none)]> CREATE USER 'mailuser'@'127.0.0.1' IDENTIFIED BY '<password>';
MariaDB [(none)]> CREATE USER 'mailadmin'@'localhost' IDENTIFIED BY '<password>';
MariaDB [(none)]> GRANT ALL ON MAIL.* TO 'mailadmin'@'localhost';
MariaDB [(none)]> GRANT SELECT ON MAIL.* TO 'mailuser'@'127.0.0.1';

MariaDB [(none)]> USE MAIL;
MariaDB [(MAIL)]> CREATE TABLE IF NOT EXISTS `virtual_domains` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

MariaDB [(none)]> USE MAIL;
MariaDB [(MAIL)]> CREATE TABLE IF NOT EXISTS `virtual_users` (
`id` int(11) NOT NULL auto_increment,
`domain_id` int(11) NOT NULL,
`email` varchar(100) NOT NULL,
`password` varchar(150) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `email` (`email`),
FOREIGN KEY (domain_id) REFERENCES virtual_domains(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

USE MAIL;
MariaDB [(MAIL)]> CREATE TABLE IF NOT EXISTS `virtual_aliases` (
`id` int(11) NOT NULL auto_increment,
`domain_id` int(11) NOT NULL,
`source` varchar(100) NOT NULL,
`destination` varchar(100) NOT NULL,
PRIMARY KEY (`id`),
FOREIGN KEY (domain_id) REFERENCES virtual_domains(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Configure Postfix to Use MariaDB

/etc/postfix/mysql-virtual-mailbox-domains.cf
user = mailuser
password = <password>
hosts = localhost
dbname = MAIL
query = SELECT 1 FROM virtual_domains WHERE name='%s'
/etc/postfix/mysql-virtual-mailbox-maps.cf
user = mailuser
password = <password>
hosts = 127.0.0.1
dbname = MAIL
query = SELECT 1 FROM virtual_users WHERE email='%s'
/etc/postfix/mysql-virtual-alias-maps.cf
user = mailuser
password = <password>
hosts = 127.0.0.1
dbname = MAIL
query = SELECT destination FROM virtual_aliases WHERE source='%s'
/etc/postfix/mysql-email2email.cf
user = mailuser
password = <password>
hosts = 127.0.0.1
dbname = MAIL
query = SELECT email FROM virtual_users WHERE email='%s'
# postconf virtual_mailbox_domains=mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
# postconf virtual_mailbox_maps=mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
# postconf virtual_alias_maps=mysql:/etc/postfix/mysql-virtual-alias-maps.cf,mysql:/etc/postfix/mysql-email2email.cf
# chgrp postfix /etc/postfix/mysql-*.cf
# chmod 640 /etc/postfix/mysql-*.cf

Dovecot

# groupadd -g 5000 vmail
# useradd -g vmail -u 5000 vmail -d /var/vmail -m
# chown -R vmail:vmail /srv/mail

# cp /usr/share/doc/dovecot/example-config/dovecot.conf /etc/dovecot
# cp -r /usr/share/doc/dovecot/example-config/conf.d /etc/dovecot

/etc/dovecot/conf.d/10-auth.conf
...
#!include auth-system.conf.ext
!include auth-sql.conf.ext
...
/etc/dovecot/conf.d/auth-sql.conf.ext
...
#userdb {
#  driver = sql
#  args = /etc/dovecot/dovecot-sql.conf.ext
#}
...
userdb {
  driver = static
  args = uid=vmail gid=vmail home=/srv/mail/%d/%n
}
/etc/dovecot/conf.d/10-mail.conf
...
mail_location = maildir:/srv/mail/%d/%n/Maildir
...
namespace inbox {
...
  separator = .
...
}
...
/etc/dovecot/conf.d/10-master.conf
...
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
...
}
...
service auth {
...
  # Postfix smtp-auth
  unix_listener /var/spool/postfix/private/auth {
    mode = 0660
    user = postfix
    group = postfix
  }
...
}
...
/etc/dovecot/conf.d/10-ssl.conf
...
ssl = yes
...
ssl_cert = </etc/letsencrypt/live/<domain>/fullchain.pem
ssl_key = </etc/letsencrypt/live/<domain>/privkey.pem
...
ssl_ca = </etc/letsencrypt/live/<domain>/chain.pem
...
/etc/dovecot/conf.d/15-mailboxes.conf
...
mailbox INBOX.Drafts {
  special_use = \Drafts
  auto = subscribe
}
mailbox INBOX.Junk {
  special_use = \Junk
  auto = subscribe
  autoexpunge = 30d
}
mailbox INBOX.Trash {
  special_use = \Trash
  auto = subscribe
  autoexpunge = 30d
}
mailbox INBOX.Sent {
  special_use = \Sent
  auto = subscribe
}
...
/etc/dovecot/conf.d/20-imap.conf
...
protocol imap {
  # Space separated list of plugins to load (default is global mail_plugins).
  mail_plugins = $mail_plugins imap_sieve
...
}
/etc/dovecot/conf.d/20-lmtp.conf
...
protocol lmtp {
  # Space separated list of plugins to load (default is global mail_plugins).
  mail_plugins = $mail_plugins sieve
...
}
/etc/dovecot/conf.d/90-sieve.conf
...
sieve_after = /etc/dovecot/sieve-after
...
sieve_plugins = sieve_imapsieve sieve_extprograms
...
# From elsewhere to Junk folder
imapsieve_mailbox1_name = Junk
imapsieve_mailbox1_causes = COPY
imapsieve_mailbox1_before = file:/etc/dovecot/sieve/learn-spam.sieve

# From Junk folder to elsewhere
imapsieve_mailbox2_name = *
imapsieve_mailbox2_from = Junk
imapsieve_mailbox2_causes = COPY
imapsieve_mailbox2_before = file:/etc/dovecot/sieve/learn-ham.sieve

sieve_pipe_bin_dir = /etc/dovecot/sieve
sieve_global_extensions = +vnd.dovecot.pipe
}
# mkdir /etc/dovecot/sieve{-after,}

/etc/dovecot/sieve-after/spam-to-folder.sieve
require ["fileinto","mailbox"];

if header :contains "X-Spam" "Yes" {
 fileinto :create "INBOX.Junk";
 stop;
}
/etc/dovecot/sieve/learn-spam.sieve
require ["vnd.dovecot.pipe", "copy", "imapsieve"];
pipe :copy "rspamd-learn-spam.sh";
/etc/dovecot/sieve/learn-ham.sieve
require ["vnd.dovecot.pipe", "copy", "imapsieve"];
pipe :copy "rspamd-learn-ham.sh";
/etc/dovecot/dovecot-sql.conf.ext
driver = mysql
connect = host=127.0.0.1 dbname=MAIL user=mailuser password=<password>
default_pass_scheme = SHA256-CRYPT
password_query = SELECT email as user, password FROM virtual_users WHERE email='%u';
/etc/dovecot/sieve/rspamd-learn-spam.sh
#!/usr/bin/env sh
exec /usr/bin/rspamc learn_spam
/etc/dovecot/sieve/rspamd-learn-ham.sh
#!/usr/bin/env sh
exec /usr/bin/rspamc learn_ham
# sievec /etc/dovecot/sieve-after/spam-to-folder.sieve
# sievec /etc/dovecot/sieve/learn-spam.sieve
# sievec /etc/dovecot/sieve/learn-ham.sieve
# chown root:root /etc/dovecot/dovecot-sql.conf.ext
# chmod 600 /etc/dovecot/dovecot-sql.conf.ext
# chmod 600 /etc/dovecot/sieve/learn-{spam,ham}.sieve
# chmod 700 /etc/dovecot/sieve/rspamd-learn-{spam,ham}.sh
# chown vmail:vmail /etc/dovecot/sieve/learn-{spam,ham}.sieve
# chown vmail:vmail /etc/dovecot/sieve/rspamd-learn-{spam,ham}.sh

Final Postfix Configuration

# postconf virtual_transport=lmtp:unix:private/dovecot-lmtp
# postconf smtpd_sasl_type=dovecot
# postconf smtpd_sasl_path=private/auth
# postconf smtpd_sasl_auth_enable=yes
# postconf smtpd_tls_security_level=may
# postconf smtpd_tls_auth_only=yes
# postconf smtpd_tls_cert_file=/etc/letsencrypt/live/<domain>/fullchain.pem
# postconf smtpd_tls_key_file=/etc/letsencrypt/live/<domain>/privkey.pem
# postconf smtp_tls_security_level=may
# postconf smtpd_milters=inet:127.0.0.1:11332
# postconf non_smtpd_milters=inet:127.0.0.1:11332
# postconf milter_protocol=6
# postconf milter_mail_macros="i {mail_addr} {client_addr} {client_name} {auth_authen}"

/etc/postfix/master.cf
...
submission inet n - - - - smtpd
 -o syslog_name=postfix/submission
 -o smtpd_tls_security_level=encrypt
 -o smtpd_sasl_auth_enable=yes
 -o smtpd_sasl_type=dovecot
 -o smtpd_sasl_path=private/auth
 -o smtpd_sasl_security_options=noanonymous
 -o smtpd_sender_login_maps=mysql:/etc/postfix/mysql-email2email.cf
 -o smtpd_sender_restrictions=reject_sender_login_mismatch
 -o smtpd_sasl_local_domain=$myhostname
 -o smtpd_client_restrictions=permit_sasl_authenticated,reject
 -o smtpd_recipient_restrictions=reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_sasl_authenticated,reject
...

Rspamd

# mkdir /etc/rspamd/conf.d

/etc/rspamd/override.d/milter_headers.conf
extended_spam_headers = true;
/etc/rspamd/override.d/classifier-bayes.conf
autolearn = true;
# mkdir /var/lib/rspamd/dkim
# chown _rspamd:_rspamd /var/lib/rspamd/dkim
# rspamadm dkim_keygen -d <domain> -s $(date +%Y%m%d)

/var/lib/rspamd/dkim/<domain>.YYYYMMDD.key
-----BEGIN PRIVATE KEY-----
[base64 key]
-----END PRIVATE KEY-----

The second part of the output of rspamadm dkim_keygen can be directly pasted into a DNS zone if you are running your own server. If you only have control of your domain name through a 3rd party:

Type Host Value
TXT @ v=spf1 a mx ip4:<ip-address> -all
TXT _dmarc v=DMARC1; p=none; sp=none; rf=afrf; pct=100; ri=86400
TXT YYYYMMDD._domainkey v=DKIM1; k=rsa; p=AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789... 
/etc/rspamd/local.d/dkim_signing.conf
path = "/var/lib/rspamd/dkim/$domain.$selector.key";
selector_map = "/etc/rspamd/dkim_selectors.map";
/etc/rspamd/dkim_selectors.map
<domain> YYYYMMDD

PHP-FPM

Look for and edit the following lines in /etc/php/php.ini: 

/etc/php/php.ini
[PHP]
open_basedir = /srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/dev/urandom:/proc/meminfo
include_path = ".:/php/includes:/usr/share/pear"
upload_max_filesize = 8M

extension=apcu
extension=dba
extension=exif
extension=gd
extension=gettext
extension=iconv
extension=intl
extension=sodium
extension=ldap
extension=mysqli
zend_extension=opcache
extension=pdo_mysql
extension=soap

[Pdo_mysql]
pdo_mysql.cache_size = 2000

[opcache]
opcache.enable=1
opcache.enable_cli=1
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.revalidate_freq=1
opcache.save_comments=1

tmpfs for PHP Sessions

/etc/php/php.ini
[Session]
session.save_path = "/srv/phptmp"

Find the id and gid of the mysql user and group: 

$ id mysql
uid=27(mysql) gid=27(mysql) groups=27(mysql)
/etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.

# <file system> <dir>           <type>  <options>                                       <dump> <pass>
...
tmpfs		/srv/phptmp	tmpfs	rw,noatime,gid=27,uid=27,size=100M,mode=0750	0 0
...

Then make sure the php-fpm service is enabled and running: 

# systemctl enable --now php-fpm

Nginx

Main Configuration

First, edit /etc/nginx/nginx.conf: 

/etc/nginx/nginx.conf
user					http;
worker_processes			1;	# one(1) worker or equal the number of _real_ cpu cores. 4=4 core cpu
worker_priority				15;	# renice workers to reduce priority compared to system processes for machine health.	Worst case nginx will get ~25% system resources at nice=15
worker_rlimit_nofile			1024;	# maximum number of open files
worker_cpu_affinity			auto;

events {
	multi_accept			on;
	accept_mutex			on;	# serially accept() connections and pass to workers, efficient if workers gt 1
	accept_mutex_delay		500ms;	# worker process will accept mutex after this delay if not assigned. (default 500ms)
	worker_connections		1024;	# number of parallel or concurrent connections per worker_processes
}

http {
	charset				utf-8;
	aio				on;	# asynchronous file I/O, fast with ZFS, make sure sendfile=off
	sendfile			off;	# on for decent direct disk IO, off for VMs
	tcp_nopush			off;	# turning on requires sendfile=on
	tcp_nodelay			on;	# Nagle buffering algorithm, used for keepalive only
	server_tokens			off;	# version number in error pages
	log_not_found			off;
	types_hash_max_size		4096;

	# MIME
	include				mime.types;
	default_type			application/octet-stream;

	# logging
	access_log			/var/log/nginx/access.log;
	error_log			/var/log/nginx/error.log warn;

	# SSL
	ssl_session_timeout             1440m;
	ssl_session_cache		shared:le_nginx_SSL:10m;
	ssl_session_tickets		off;
	ssl_prefer_server_ciphers	off;

	# Diffie-Hellman parameter for DHE ciphersuites
	ssl_dhparam                     /etc/letsencrypt/ssl-dhparams.pem;

	# Mozilla Intermediate configuration
	ssl_protocols			TLSv1.2 TLSv1.3;
	ssl_ciphers			ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;

	# OCSP Stapling
	ssl_stapling			on;
	ssl_stapling_verify		on;
	resolver			1.1.1.1 1.0.0.1 8.8.8.8 8.8.4.4 208.67.222.222 208.67.220.220 valid=60s;
	resolver_timeout		2s;

	# Size Limits
	#client_body_buffer_size	8k;
	#client_header_buffer_size	1k;
	client_max_body_size		16M;
	#large_client_header_buffers	4 4k/8k;

	## From StackOverflow: for "upstream sent too big header while reading response header from upstream"
	fastcgi_buffers			8 16k;
	fastcgi_buffer_size		32k;

	# Timeouts, do not keep connections open longer then necessary to reduce
	# resource usage and deny Slowloris type attacks.
	client_body_timeout		5s;	# maximum time between packets the client can pause when sending nginx any data
	client_header_timeout		5s;	# maximum time the client has to send the entire header to nginx
	keepalive_timeout		75s;	# timeout which a single keep-alive client connection will stay open
	send_timeout			15s;	# maximum time between packets nginx is allowed to pause when sending the client data

	## General Options

	gzip				off;	# disable on the fly gzip compression due to higher latency, only use gzip_static
	#gzip_http_version		1.0;	# serve gzipped content to all clients including HTTP/1.0
	gzip_static			on;	# precompress content (gzip -9) with an external script
	#gzip_vary			on;	# send response header "Vary: Accept-Encoding"
	gzip_proxied			any;	# allows compressed responses for any request even from proxies
	ignore_invalid_headers		on;
	keepalive_requests		50;	# number of requests per connection, does not affect SPDY
	keepalive_disable		none;	# allow all browsers to use keepalive connections
	max_ranges			1;	# allow a single range header for resumed downloads and to stop large range header DoS attacks
	msie_padding			off;
	open_file_cache			max=1000 inactive=2h;
	open_file_cache_errors		on;
	open_file_cache_min_uses	1;
	open_file_cache_valid		1h;
	output_buffers			1 512;
	postpone_output			1440;	# postpone sends to match our machine's MSS
	read_ahead			512K;	# kernel read head set to the output_buffers
	recursive_error_pages		on;
	reset_timedout_connection	on;	# reset timed out connections freeing ram
	server_name_in_redirect		off;	# if off, nginx will use the requested Host header
	source_charset			utf-8;	# same value as "charset"

	## Request limits
	limit_req_zone	$binary_remote_addr	zone=gulag:1m	rate=60r/m;

	## Log Format
	log_format	main	'$remote_addr $host $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" $ssl_cipher $request_time';

	# load configs
	include	/etc/nginx/conf.d/*.conf;
	include	/etc/nginx/sites-enabled/*.conf;

}

Make the sites-available and sites-enabled directories. 

# mkdir /etc/nginx/sites-{available,enabled}

Non-Proxied Web Site

Make a test site available by creating /etc/nginx/sites-available/<domain>.conf:
(Remove the # after setting up Let's Encrypt.) 

/etc/nginx/sites-available/<domain>.conf
server {
	listen			80;
	listen			[::]:80;
	server_name		<domain>;
	root			/srv/http/$host;
	index			index.html index.php;

#	if ($host = <domain>) {
#		return 301	https://$host$request_uri;
#	}
#
#	return 404;
#
#}
#
#server {
#
#	listen				443 ssl http2;
#	listen				[::]:443 ssl http2;
#	server_name			<domain>;
#	root				/srv/http/$host;
#	index				index.html index.php;
#
#	ssl_certificate			/etc/letsencrypt/live/<domain>/fullchain.pem;
#	ssl_certificate_key		/etc/letsencrypt/live/<domain>/privkey.pem;
#	ssl_trusted_certificate		/etc/letsencrypt/live/<domain>/chain.pem;
#
#	fastcgi_param			HTTPS on;
#
#	add_header			Strict-Transport-Security max-age=15768000;
	add_header			Cache-Control "public";
	add_header			X-Frame-Options "DENY";

	access_log			/var/log/nginx/access.log main buffer=32k;
	error_log			/var/log/nginx/error.log error;
	limit_req			zone=gulag burst=200 nodelay;


	# ACME challenge
	location ^~ /.well-known {
		allow			all;
		alias			/var/lib/letsencrypt/$host/.well-known;
		default_type		"text/plain";
		try_files		$uri =404;
	}

	location ~ /(data|conf|bin|inc)/ {
		deny			all;
	}

	# static file 404's are strict access by hostname aren't logged and expires header is set to maximum age
	location ~* \.(jpg|jpeg|gif|css|png|js|ico|html)$ {
		access_log		off;
		expires			max;
	}

	location ~ \.php$ {
		try_files		$uri = 404;
		fastcgi_pass		unix:/run/php-fpm/php-fpm.sock;
		fastcgi_index		index.php;
		include			fastcgi.conf;
	}

	location ~ \.php5$ {
		try_files		$uri = 404;
		fastcgi_pass		unix:/run/php-fpm/php-fpm.sock;
		fastcgi_index		index.php5;
		include			fastcgi.conf;
	}

	location ~ /\.ht {
		deny			all;
	}

}

Enable the site 

# ln -s ../sites-available/<domain>.conf /etc/nginx/sites-enabled/<domain>.conf

Then create index.php for your new site. 

/srv/http/<domain>/index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Server Configuration Confirmation</title>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>

<body style="font-family:sans-serif;">

<h1>Web server is properly configured!</h1>

<?php echo "<h2>PHP is properly configured as well!</h2>" ?>

<p>Time to add some content!</p>

</body>
</html>

Finally, make sure the nginx service is enabled and running: 

# systemctl enable --now nginx

Let's Encrypt

# certbot --nginx

The nginx plugin will guide you and help automate the process.

Take note that the nginx configuration in this guide takes into account the settings suggested by certbot.

Automatic Renewal

These will automatically renew your certificates every 2 months on the first Sunday of the month at 4am.

Systemd

/etc/systemd/system/certbot.service
[Unit]
Description=Let's Encrypt renewal

[Service]
Type=oneshot
ExecStart=/usr/bin/certbot renew --agree-tos --no-redirect
/etc/systemd/system/certbot.timer
[Unit]
Description=Bi-monthly renewal of Let's Encrypt's certificates

[Timer]
OnCalendar=Sun *-1,3,5,7,9,11-1..7 04:00:00
RandomizedDelaySec=1h
Persistent=true

[Install]
WantedBy=timers.target

Crontab

0 4 1-7 2-12/2 0 /usr/bin/certbot renew --agree-tos --no-redirect

ISPmail Admin

Create a config like Arch_Post-Installation_Checklist#Non-Proxied_Web_Site

Then, in the site's root: 

# wget 'https://www.ima.jungclaussen.com/dwn/dwn.php?v=0.9.6&f=.tar.gz'
# tar -xvf 'dwn.php?v=0.9.6&f=.tar.gz'
# mv ispmail*/htdocs/* ./
# rm -r 'dwn.php?v=0.9.6&f=.tar.gz' ispmail*

Then edit the configuration file: 

<ispmail_root>/cfg/config.inc.php
<?php

// @package     ISPmail_Admin
// @author      Ole Jungclaussen
// @version     0.9.0

// SHOW PHP ERRORS (DEBUGGING)

// ini_set('display_startup_errors', 1);
// ini_set('display_errors', 1);
// error_reporting(-1);

// DATABASE ACCESS

define('IMA_CFG_DB_HOST',       '127.0.0.1');
define('IMA_CFG_DB_PORT',       '3306');
define('IMA_CFG_DB_USER',       'mailadmin');
define('IMA_CFG_DB_PASSWORD',   '<password>');
define('IMA_CFG_DB_DATABASE',   'MAIL');

// PASSWORD HASHES (enable only *one*)

define('IMA_CFG_USE_SHA256_HASHES', true);
// define('IMA_CFG_USE_MD5_HASHES', true);

// ACCESS CONTROL: uncomment the type you want to use.

define('IMA_CFG_LOGIN', IMA_LOGINTYPE_ACCOUNT);
// define('IMA_CFG_LOGIN', IMA_LOGINTYPE_ADM);
// define('IMA_CFG_LOGIN', IMA_LOGINTYPE_ADMAUTO);

// ADMINISTRATOR'S NAME AND PASSWORD

define('IMA_CFG_ADM_USER',  'admin');      // admin username
define('IMA_CFG_ADM_PASS',  '<password>'); // admin password

// LISTS
// Spread long lists on multiple pages.  Set number of maximum entries
// per page.  Changes take effect after login/logout.  If not defined,
// defaults to 65535.

// define('IMA_LIST_MAX_ENTRIES', 200);
?>

You should now be able to log in and set up your virtual mailboxes.

Roundcube

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