How to Assign a Static IP Address in CentOS 7
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Summary: Learn the step-by-step process for configuring a static IP address on a CentOS 7 system, including necessary configuration file edits and service restarts. Ideal for network administrators and IT professionals managing CentOS servers.
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How to Assign a Static IP Address in CentOS 7
Configuring a static IP address in CentOS 7 is a common task for network administrators and IT professionals who manage servers. Unlike dynamic IP addresses assigned by a DHCP server, a static IP does not change, making it essential for servers hosting websites, applications, or services where a consistent address is necessary.
Step 1: Access the Network Configuration File
To set a static IP, you first need to modify the network configuration files. In CentOS 7, network interfaces are managed by the NetworkManager service and configuration files are located in /etc/sysconfig/network-scripts/. Here’s how you access and modify the necessary file:
Identify the interface you wish to configure:
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Look for the device you want to configure under the DEVICE column.
Open the corresponding configuration file using a text editor such as vi or nano. For instance, if your network interface is ens33, the file will be named ifcfg-ens33:
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Step 2: Edit the Configuration File
Within the configuration file, you will set several parameters to configure a static IP. Here are the essential directives:
BOOTPROTO: Set this to none to disable DHCP.
ONBOOT: Set to yes to activate the interface at boot.
IPADDR: Your desired static IP address.
NETMASK: The netmask, which defines the subnet.
GATEWAY: The default gateway.
DNS1: The primary DNS server.
DNS2: (Optional) The secondary DNS server.
Here is an example of what the configuration file might look like:
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Make sure to replace the IP address, netmask, gateway, and DNS servers with those appropriate for your network.
Step 3: Restart the Network Service
After saving your changes, restart the NetworkManager service to apply the new configuration:
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Step 4: Verify the Configuration
To ensure that your changes have been applied correctly, use the following command to check your network interface settings:
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This command will display the current settings for ens33. Verify that the static IP address and other settings are correctly applied.
Conclusion
Setting a static IP in CentOS 7 involves editing the network interface’s configuration file and restarting the NetworkManager service. This setup is crucial for maintaining reliable network connectivity for services that require a fixed IP address. Remember to always back up configuration files before making changes to prevent issues if a mistake occurs.
centos 7
