Скачать или смотреть Linux Time Sync & Mail Server: NTP, chrony, timedatectl & Postfix (Hands-On)

⏰ Linux System Administration: Time Sync & Mail Server Setup

⚠️ Why This Matters:
Time drift causes 34% of system failures (log errors, auth issues, backup failures)

💻 Today’s Lab Walkthrough:

1. Time Synchronization:
```bash
Traditional NTP
sudo yum install ntp
sudo systemctl enable ntpd
Modern chrony (RHEL 8+)
sudo dnf install chrony
sudo systemctl enable --now chronyd
System time control
timedatectl set-timezone America/New_York
timedatectl set-ntp true
timedatectl status

2. Mail Server (Postfix + s-nail):
Install Postfix & s-nail
sudo yum install postfix s-nail
Configure Postfix
sudo vi /etc/postfix/main.cf
sudo systemctl enable --now postfix
Test email
echo "Test body" | s-nail -s "Test Subject" [email protected]

3. Verification & Debugging:
Check time sync
chronyc tracking
ntpq -p
Check mail queue
mailq
postfix check

🔥 Pro Tip: Use chronyc sources -v to verify time sources and their status!

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#linuxadministrator #ntp #chrony #postfix #sysadmin