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78 lines
2.9 KiB
Markdown
78 lines
2.9 KiB
Markdown
# System Preparation
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Now that we know **_what_** to build, lets go ahead and build it.
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* Open up AWS, select EC2 and hit the [Launch Instance] button.
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* Give this server a name and then search for "rocky" in the OS images. When you have found it, select "Rocky 9".
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* Under Instance Type, select a t2.xlarge, provide your keypair for login or create a pair if necessary.
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* In the Network Settings, select or create a security group that includes ports 22,25,80,443,587,2025. These will be important for sending and receiving email in a number of ways.
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* Finally, modify the storage volume to 300Gb (or anything over 100Gb) and click [Launch Instance].
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... wait ....
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When AWS has finished building your server instance, you can select it and connect. I prefer to find the SSH client information and use a remote terminal emulator like Putty or Terminal like this:
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```console
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ssh -i "yourkeyname.pem" rocky@ec2-\<pub-lic-ip\>.us-west-2.compute.amazonaws.com
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```
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## Doing the basics
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Reguardless of what system you deploy, there are things you need to do to prepare the OS before installing the MTA.
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* Update to the latest patches
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* Install basic testing and support tools
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* Turn off services that are wasteful or can interfere
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* Tune the use of memory and file access for best performance
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* Automate updates and startup for resilliency
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### Rocky Linux Example
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Rocky Linux is very similar to CentOS, as is Alma and RHEL The instructions below are shown for a Rocky 9 system but with slight modification, should work for any DNF package management system. For Amazon Linux (AL2) the instructions are identical, but replace "dnf" with "yum".
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```console
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# Do basic updates
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sudo dnf clean all
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sudo dnf update -y
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# Grab some handy tools
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sudo dnf install -y wget bind bind-utils telnet firewalld ...
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```
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It is always a good idea to automate daily systems updates.
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```console
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# Make sure it all stays up to date
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# Run a dnf update at 3AM daily
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echo "0 3 * * * root /usr/bin/dnf update -y >/dev/null 2>&1" | sudo tee /etc/cron.d/dnf-updates >/dev/null
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```
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... and configure the local firewall...
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```console
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# Build a basic firewall
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sudo echo "ZONE=public
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" | sudo tee -a /etc/sysconfig/network-scripts/ifcfg-eth0
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sudo systemctl stop firewalld
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sudo systemctl start firewalld.service
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sudo firewall-cmd --set-default-zone=public
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sudo firewall-cmd --zone=public --change-interface=eth0
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sudo firewall-cmd --zone=public --permanent --add-service=http
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sudo firewall-cmd --zone=public --permanent --add-service=https
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sudo firewall-cmd --zone=public --permanent --add-service=ssh
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sudo firewall-cmd --zone=public --permanent --add-service=smtp
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sudo firewall-cmd --zone=public --permanent --add-port=587/tcp
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sudo systemctl enable firewalld
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sudo firewall-cmd --reload
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```
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ANd finally, disabling unnecessary services like postfix and qpidd
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```console
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$ sudo systemctl stop postfix.service
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$ sudo systemctl disable postfix.service
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$ sudo systemctl stop qpidd.service
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$ sudo systemctl disable qpidd.service
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```
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