How to view and modify hostname under Linux
Editor to share with you how to view and modify hostname under Linux, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!
Hostname is the hostname used to identify a machine in the system. After logging in to the linux system, [root@izm5e9z5o9dc8yjs3vh6mhz], where @ is followed by the host name, you can determine the landing system by the host name.
Query hostname:
Uname-n
Hostname
[root@oldboy ~] # uname-noldboy [root@oldboy ~] # hostnameoldboy
The hostname of the Linux operating system is a kernel variable, and you can view the native hostname through the hostname command. You can also view it directly by cat / proc/sys/kernel/hostname.
[root@oldboy ~] # hostnameoldboy [root@oldboy ~] # cat / proc/sys/kernel/hostnameoldboy
The above two outputs have the same result.
Modify the hostname of the runtime Linux system, that is, there is no need to restart the system
The hostname command can set the hostname of the system, which takes effect immediately after running, but the changes will be lost after the system is rebooted. If you want to permanently change the hostname of the system, you need to modify the relevant settings file.
Set the hostname:
Temporary effect:
The default is to display the hostname set the hostname: hostname hostname
Hostname displays and sets hostname
Permanent effect:
Vim / etc/sysconfig/network; modifies hostname to the expected value; save and exit.
/ etc/sysconfig/network
Vim / etc/hosts; modifies or adds hostname, the IP address corresponding to the hostname. Save and exit.
/ etc/hosts
The service network restart; network restarts.
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