Configure OpenSMTPD on AlmaLinux 9

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc/...

Configure OpenSMTPD on Arch Linux

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc/s...

Configure OpenSMTPD on Debian 12

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc/ss...

Configure OpenSMTPD on Gentoo Linux

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc...

Configure OpenSMTPD on NetBSD 10

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc/ss...

Configure OpenSMTPD on OpenBSD 7.5

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc/...

Configure OpenSMTPD on RHEL 9

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc/ssl/m...

Configure OpenSMTPD on Ubuntu 24.04

Install

# OpenBSD – built-in:
rcctl enable smtpd && rcctl start smtpd

# Other platforms:
# Ubuntu/Debian:
apt install opensmtpd
# AlmaLinux/RHEL:
dnf install opensmtpd
# Arch:
pacman -S opensmtpd

Basic /etc/mail/smtpd.conf

pki mail.example.com cert "/etc...

Configuring the server

Create a file /etc/dnsmasq.d/main.conf containing the following:

# ignore resolv.conf
no-resolv

# use google dns servers for internet lookups
server=8.8.8.8
server=8.8.4.4

# define localdomain, answers for this domain will come from /etc/hosts or static hosts files
local...

Install Elasticsearch, build a multi-node cluster and automate snapshot backups.

Elasticsearch Multi-Node Cluster on AlmaLinux 9

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.port...

Elasticsearch Multi-Node Cluster on Arch Linux

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.port:...

Elasticsearch Multi-Node Cluster on Debian 12

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.port:...

Elasticsearch Multi-Node Cluster on Gentoo Linux

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.por...

Elasticsearch Multi-Node Cluster on NetBSD 10

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.port:...

Elasticsearch Multi-Node Cluster on OpenBSD 7.5

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.port...

Elasticsearch Multi-Node Cluster on RHEL 9

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.port: 930...

Elasticsearch Multi-Node Cluster on Ubuntu 24.04

Nodes: node-1 192.168.1.10 · node-2 192.168.1.11 · node-3 192.168.1.12

Node 1 elasticsearch.yml

cluster.name: production-cluster
node.name: node-1
node.roles: [master, data, ingest]
network.host: 192.168.1.10
http.port: 9200
transport.por...

Elasticsearch Snapshot Backup on AlmaLinux 9

Register filesystem repository

mkdir -p /var/backups/elasticsearch
chown elasticsearch:elasticsearch /var/backups/elasticsearch

elasticsearch.yml: path.repo: ["/var/backups/elasticsearch"]

curl -X PUT "https://localhost:9200/_snapshot/my_backup"...

Elasticsearch Snapshot Backup on Arch Linux

Register filesystem repository

mkdir -p /var/backups/elasticsearch
chown elasticsearch:elasticsearch /var/backups/elasticsearch

elasticsearch.yml: path.repo: ["/var/backups/elasticsearch"]

curl -X PUT "https://localhost:9200/_snapshot/my_backup"...

Elasticsearch Snapshot Backup on Debian 12

Register filesystem repository

mkdir -p /var/backups/elasticsearch
chown elasticsearch:elasticsearch /var/backups/elasticsearch

elasticsearch.yml: path.repo: ["/var/backups/elasticsearch"]

curl -X PUT "https://localhost:9200/_snapshot/my_backup" \...

Elasticsearch Snapshot Backup on Gentoo Linux

Register filesystem repository

mkdir -p /var/backups/elasticsearch
chown elasticsearch:elasticsearch /var/backups/elasticsearch

elasticsearch.yml: path.repo: ["/var/backups/elasticsearch"]

curl -X PUT "https://localhost:9200/_snapshot/my_backup...

Elasticsearch Snapshot Backup on NetBSD 10

Register filesystem repository

mkdir -p /var/backups/elasticsearch
chown elasticsearch:elasticsearch /var/backups/elasticsearch

elasticsearch.yml: path.repo: ["/var/backups/elasticsearch"]

curl -X PUT "https://localhost:9200/_snapshot/my_backup" \...

Elasticsearch Snapshot Backup on OpenBSD 7.5

Register filesystem repository

mkdir -p /var/backups/elasticsearch
chown elasticsearch:elasticsearch /var/backups/elasticsearch

elasticsearch.yml: path.repo: ["/var/backups/elasticsearch"]

curl -X PUT "https://localhost:9200/_snapshot/my_backup"...