TJ CSL
  • TJ CSL
  • Services
    • Ion
      • Development
        • Overview
        • Setup
          • Docker Setup
          • Vagrant Setup
        • Environment
        • Fixtures
        • PR Workflow
        • Style Guide
        • Maintainer Workflow
        • Repository Maintenance
        • Data Generation
      • Production
      • User Experience
        • User Interface
    • Director
      • Development
        • Vagrant Setup
        • PR Workflow
        • Style Guide
        • Maintainer Workflow
      • Production
    • Workstations
    • Signage
      • Setup
      • Administration
      • Monitoring
      • Troubleshooting
      • Experimental
        • IonTap
        • SignageAdmin
    • Remote Access
      • Setup
      • Administration
    • Cluster
      • FAQ
      • Setup
        • SSH Setup
      • Administration
      • Slurm
      • Slurm Administration
      • Borg
    • Printing
      • Setup
      • Troubleshooting
    • WWW
      • Administration
      • Sites
        • Web Proxy
      • Setup
      • Troubleshooting
    • Academic Services
      • Tin
      • Othello
        • Administration
        • Setup
  • Technologies
    • Web
      • Nginx
      • Django
      • PHP-FPM
      • Node.js
      • Supervisord
    • DBs
      • PostgreSQL
      • MySQL
    • Authentication
      • Passcard
        • GPG Usage
      • SSHD
        • SSH Passwordless Login
      • FreeIPA
    • Storage
      • NFS
      • Ceph
        • Setup
        • Backups
        • CephFS
    • Operating Systems
      • Ubuntu Server
      • AlmaLinux
      • Debian
    • Tools
      • Ansible
      • Slack
      • GitBook
      • GitLab
        • Setup
        • Updating
    • Virtualization
      • QEMU/KVM
      • Libvirt
    • Advanced Computing
      • MPI
      • Tensorflow
    • Networking
      • Netbox
      • Cisco
      • Netboot
      • DNS
      • DHCP
      • NTP
      • BGP
    • Mail
      • Postfix
      • Dovecot
    • Monitoring
      • Prometheus
      • Grafana
      • Sentry
      • Uptime Robot
  • Machines
    • VM Servers
      • Utonium
      • Blossom
      • Bubbles
      • Buttercup
      • Antipodes
      • Chatham
      • Cocos
      • Galapagos
      • Gandalf
      • Gorgona
      • Overlord
      • Waverider
      • Torch
    • Ceph
      • Karel
      • Stobar
      • Wumpus
      • Waitaha
      • Barrel
      • Valdes
    • HPC Cluster
      • Zoidberg
    • Borg Cluster
    • Compute Sticks
    • Other
      • ASM
      • Duke
      • Snowy
      • Sauron
      • Sun Servers
        • Altair
        • Centauri
        • Deneb
        • Sirius
        • Vega
        • Betelgeuse
        • Ohare
    • Switches
      • Core0
      • Xnor
      • Xor
      • Imply
    • UPS
    • History
      • 2008 Sun AEG
      • 2011 Sun Upgrades
      • 2017 VM Disaster
      • 2018 Purchases
      • 2018 Cephpocalypse
    • VLANs
    • Remote Management
      • iLO
      • LOMs
    • Understudy
      • Switch Configuration
      • Server Configuration
        • Setting Up the Operating System
        • Network Configuration
        • Saruman
        • Fiordland
  • General
    • Sysadmins List
    • Organization
    • Documentation
      • Security
      • Runbooks
    • Communication
      • Terminology
    • Understudies
    • Account Structure
    • Machine Room
    • Branding
    • History
      • Fridge
      • The Brick
  • Procedures
    • Data Recovery
    • Account Provisioning
    • tjSTAR
      • Tech Support
    • Onboarding
      • New Sysadmin Onboarding
  • Guides
    • VM Creation
    • sshuttle Usage
    • Linux Wifi Setup
    • VNC Usage
    • Password Changes
    • Sun Server RAID Configuration
  • Policies
    • Data Release Policy
    • Upgrade Policy
    • Account Policy
    • Election Policy
  • Obsolete
    • Arcturus
    • Chuku
    • Cray SV1 Supercomputer
    • Ekhi
    • Mihr
    • Moloch
    • Sol
    • Rockhopper
    • Kerberos
    • LDAP
    • Agni
    • Moon
    • Apocalypse
    • AFS
      • OpenAFS
      • Setup
      • Client Setup
      • Administration
      • Troubleshooting
      • Directory Structure
      • Backups
      • Cross-Cell Authentication
    • Observium
    • OpenVPN
Powered by GitBook
On this page
  • Configuration
  • Troubleshooting
  1. Technologies
  2. Networking

NTP

PreviousDHCPNextBGP

Last updated 1 year ago

NTP (Network Time Protocol) is a protocol to synchronize the clocks between various computers (read more at its ). In the CSL we currently run two NTP servers, which coincidentally are also the FreeIPA servers.

Configuration

This should be automatically handled when you join a machine to FreeIPA. You can copy an NTP configuration file from any NTP client to /etc/chrony/chrony.conf or /etc/chrony.conf (depending on the OS) and run systemctl restart chronyd.

Troubleshooting

systemctl status chronyd is complaining about being unable to reach the NTP server. What should I do?

Make sure that you can reach the server's NTP ports. Running nc ntp1.tjhsst.edu 123 should return the current time. If it does not connect, something is wrong with the machine's connection to the NTP servers.

WIkipedia page