# Useful server configuration notes

## Enable persistent system logging

```
sudo mkdir -p /var/log/journal
```

## Persistent terminal session

```
nano ~/.bashrc
```
```
...

if [[ -z "$TMUX" ]] && [ "$SSH_CONNECTION" != "" ]; then
    tmux attach-session -t ssh_tmux || tmux new-session -s ssh_tmux
fi
```

## Forward local mail

### Using `ssmtp`

```
sudo apt install ssmtp -y
sudo nano /etc/ssmtp/ssmtp.conf
```
```
root=me@gmail.com
mailhub=smtp.gmail.com:587
AuthUser=me@gmail.com
AuthPass=mypass
UseSTARTTLS=YES
FromLineOverride=YES
```

Create an entry for each system user:
```
sudo nano /etc/ssmtp/revaliases
```
```
root:me@gmail.com:smtp.gmail.com:587
```

Test:
```
echo "testing" | ssmtp me@gmail.com
```

## Enable automatic updates

```
sudo apt install unattended-upgrades -y
```

Assuming `root` user emails are already forwarded:
```
sudo nano /etc/apt.conf.d/50unattended-upgrades
```
```diff
 // Send email to this address for problems or packages upgrades
 // If empty or unset then no email is sent, make sure that you
 // have a working mail setup on your system. A package that provides
 // 'mailx' must be installed. E.g. "user@example.com"
-//Unattended-Upgrade::Mail "root";
+Unattended-Upgrade::Mail "root";

 // Set this value to "true" to get emails only on errors. Default
 // is to always send a mail if Unattended-Upgrade::Mail is set
-//Unattended-Upgrade::MailOnlyOnError "true";
+Unattended-Upgrade::MailOnlyOnError "true";
```