Create needed directories

cd /etc/httpd
mkdir /etc/httpd/sites-available
mkdir /etc/httpd/sites-enabled

Append

IncludeOptional sites-enabled/*.conf

To vim /etc/httpd/conf/httpd.conf

Create vhost

/etc/httpd/sites-available/example.com.conf

<VirtualHost *:80>
    ServerName example.com
    ServerAlias www.example.com
    DocumentRoot /var/www/html
    ErrorLog /var/log/apache/example.com/error.log
</VirtualHost>

Enable vhost

Update and install the Let's Encrypt client

Install

sudo apt-get update
sudo apt-get install letsencrypt python-letsencrypt-apache

Invoke letsencrypt

sudo letsencrypt --apache -d <DOMAIN HERE>

Automate the renewal process

sudo letsencrypt renew renews all the domains on the server secured with Let's Encrypt as long as there are less than 30 days remaining until the certificate expires. We can automate the renewal process via cron.

Editing crontab:

There are two modes when you don't want Certbot to edit your configuration: - Standalone: replaces the webserver to respond to ACME challenges - Webroot: needs your webserver to serve challenges from a known folder.

Webroot is better because it doesn't need to replace Nginx (to bind to port 80) to renew certificates.

Master: Install dependencies

apt update && apt upgrade -y
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF

apt-get update
apt install linux-image-extra-virtual ca-certificates curl software-properties-common -y

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) \
stable"

apt update

Adagios and Naemon on CentOS 7 or Red Hat Enterprise Linux 7 x86_64.

If you don't know how to configure SElinux, put it in permissive mode:

sed -i "s/SELINUX=enforcing/SELINUX=permissive/" /etc/selinux/config
setenforce 0

First install the opensource.is and consol labs repositories

rpm -ihv http://opensource.is/repo/ok-release.rpm
rpm -Uvh https://labs.consol.de/repo/stable/rhel7/x86_64/labs-consol-stable.rhel7.noarch.rpm
yum update -y ok-release

Introduction

In this guide, we will be setting up the latest version of MediaWiki on an Ubuntu server. We will use the lighttpd web server to make the actual content available, php-fpm to handle dynamic processing, and mysql to store our wiki's data.

Install pure-ftp

apt-get update
apt-get install pure-ftpd

Ensure File /etc/inetd.conf has ftp commented out File /etc/default/pure-ftpd-common STANDALONE_OR_INETD=standalone

Let's Encrypt / Dovecot / Postfix / UFW firewall / Certbot

This tutorial describes how to install TLS to a mail server consisting of Postfix and/or Dovecot by using Let's Encrypt certificates with automatic renewing and firewall management.

This tutorial assumes the following prerequisites:

Setting up a Linux system as a mail server with virtual users

Introduction

Mail Transfer Agent

A Mail Transfer Agent (MTA) is the program which receives and sends out the email from your server, and is therefore the key part. In this guide is used Postfix.

Mail filtering

You can add filtering in your mail chain, mainly in order to detect spam and viruses. This how-to only covers spam filter: SpamassAssin.

curl -sSf --max-time 120 'https://websitetomonitor.url' --compressed || echo "do something with alarm on failure"

-s means silent -S show error -f Fail silently (no output at all) on server errors --max-time maximum time allowed for request

Using cron to run script

*/2 * * * * /usr/local/bin/check_website.sh

Every 2 minutes