linux_wiki:network_services_overview_ntp

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linux_wiki:network_services_overview_ntp [2016/10/08 17:28]
billdozor [Firewall] 		linux_wiki:network_services_overview_ntp [2019/05/25 23:50]
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-====== Network Services Overview NTP ====== 
- 
-**General Information** 
- 
-This page covers the Network Services objectives, specifically for NTP.  
- 
-**Network Services Objectives** 
-  * Install the packages needed to provide the service 
-  * Configure SELinux to support the service 
-  * Use SELinux port labeling to allow services to use non-standard ports 
-  * Configure the service to start when the system is booted 
-  * Configure the service for basic operation 
-  * Configure host-based and user-based security for the service 
- 
----- 
- 
-====== Install the packages needed to provide the service ====== 
- 
-Install the service (default in RHEL 7) 
-<code bash> 
-yum install chrony 
-</code> 
- 
----- 
- 
-====== Configure SELinux to support the service ====== 
- 
-  * Service agnostic -> [[linux_wiki:set_enforcing_and_permissive_modes_for_selinux|Ensure SELinux is running and enabled (RHCSA objective)]]. 
- 
----- 
- 
-====== Use SELinux port labeling to allow services to use non-standard ports ====== 
- 
-Configuring the <service-name> with a non standard port and allowing port access with selinux. 
- 
-**NOTE**: "man semanage-port" has examples for allowing non-standard ports! 
- 
----- 
- 
-====== Configure the service to start when the system is booted ====== 
- 
-Check Current Service Status 
-<code bash> 
-systemctl status chronyd 
-</code> 
-  * Also displays if the service is enabled or disabled 
- 
-\\ 
-Enabling a service to start on boot 
-<code bash> 
-systemctl enable chronyd 
-</code> 
- 
----- 
- 
-====== Configure the service for basic operation ====== 
- 
-Enable and Start the service 
-<code bash> 
-systemctl enable chronyd 
-systemctl start chronyd 
-</code> 
- 
----- 
- 
-====== Configure host-based and user-based security for the service ====== 
- 
-===== Firewall ===== 
- 
-Allow access through the firewall if you want other servers to sync to this system 
-<code bash> 
-firewall-cmd --permanent --add-service=ntp 
-firewall-cmd --reload 
-</code> 
- 
-===== Host Based ===== 
- 
- 
-===== User Based ===== 
- 
----- 
  
  • linux_wiki/network_services_overview_ntp.txt
  • Last modified: 2019/05/25 23:50
  • (external edit)