Check host type linux

Best 5 commands to check HostName in Linux

A hostname (also known as a Computer Name) is a name which is given to a device (It could be a system, switch, router, etc) that is connected to the network, and is used to identify it over a network. There cannot be two systems with same host names within the same network.

The purpose of assigning names to IP addresses is to make them easier for people to remember. In reality, an IP address identifies a network interface associated with a device like a network card.

Refer the following articles on how to change a hostname in Linux:

By default, the hostname can be found in the terminal, but it only shows the first part when the hostname is large (each hostname usually has at least one numeric network address associated with it).

In this tutorial, we will show you how to check hostname using several ways in Linux.

• hostnamectl Command: hostnamectl command is controling the system hostname.
• nmcli Command: nmcli is a command-line tool for controlling NetworkManager.
• uname Command: Print certain system information.
• hostname: Show or set system host name.
• sysctl: sysctl command allows us to configure kernel parameters at runtime.

1) Checking HostName using hostnamectl command

hostnamectl may be used to query and change the system hostname and related settings. Run the hostnamectl command to view the system hostname as shown below:

$ hostnamectl or $ hostnamectl status Static hostname: daygeek-Y700 Icon name: computer-laptop Chassis: laptop Machine ID: 31bdeb7b83230a2025d43547368d75bc Boot ID: 267f264c448f000ea5aed47263c6de7f Operating System: Manjaro Linux Kernel: Linux 4.19.20-1-MANJARO Architecture: x86-64

2) Checking the Linux system hostname

Hostname is the program that is used to either set or display the current host, domain or node name of the system. These names are used by many of the networking programs to identify the machine. The domain name is also used by NIS/YP.

3) Checking HostName with uname command

uname (stands for unix name) is a utility that prints the system information like name, version and other details about the system, and the operating system running on it:

$ uname -a | awk '' CentOS.2daygeek.com

4) Checking HostName using nmcli command

nmcli is a command-line tool for controlling NetworkManager and reporting network status.

nmcli is used to create, display, edit, delete, activate, and deactivate network connections, as well as control and display network device status. Also, it allow us to view the hostname.

Use the following format to view the current hostname using nmcli :

$ nmcli general hostname daygeek-Y700

5) Checking HostName using sysctl command

‘sysctl’ is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. Procfs is required for sysctl support in Linux. You can use sysctl to both read and write sysctl data.

$ sysctl kernel.hostname kernel.hostname = daygeek-Y700

Bonus Tips:

Alternatively, you can use the following commands to verify the hostname in Linux. These are additional methods but I rather recommend using the aforementioned five commands as they are most widely used.

• nmtui Command: nmtui is a text User Interface for controlling NetworkManager.
• /etc/hostname file: This file is containing the static system hostname.
• /etc/hosts: /etc/hosts file is an operating system file that maps hostnames to IP addresses.
• /etc/sysconfig/network: The /etc/sysconfig/network file specifies additional information that is valid to all network interfaces on the system.
• /proc/sys/kernel/hostname: The proc filesystem (procfs) is a special filesystem in Unix-like operating systems.

Method-1: Check HostName using /etc/hostname file

Alternatively, we can view the hostname by using the /etc/hostname file.

Check the current hostname using /etc/hostname file.

$ cat /etc/hostname daygeek-Y700

Method-2: Check HostName using /etc/hosts file

‘/etc/hosts’ file is an operating system file that maps hostnames to IP addresses before DNS can be referenced. It is a plain text file, one line per IP address. It’s a static table lookup for hostnames as shown below:

$ cat /etc/hosts | grep daygeek 127.0.1.1 daygeek-Y700

Method-3: Check HostName using ProcFS in Linux

The proc filesystem (procfs) is a special filesystem in Unix-like operating systems that presents information about processes and other system information.

It’s sometimes referred to as a process information pseudo-file system. It doesn’t contain ‘real’ files but runtime system information (e.g. system memory, devices mounted, hardware configuration, etc).

$ cat /proc/sys/kernel/hostname daygeek-Y700

Method-4: View HostName with nmtui

nmtui is a curses‐based TUI application for interacting with NetworkManager. When starting nmtui, the user is prompted to choose the activity to perform unless it was specified as the first argument.

Run the following command on terminal to launch the terminal user interface:

Method-5: Check HostName using /etc/sysconfig/network file

The ‘/etc/sysconfig/network’ file specifies additional information that is valid to all network interfaces on the system.

For RHEL/CentOS 6 systems only:

$ cat /etc/sysconfig/network | grep -i hostname HOSTNAME=CentOS.2daygeek.com

Wrapping Up

In this tutorial we’ve shown you ten commands to check the hostname in Linux.

If you found this article helpful, please do share with your friends and spread the knowledge. Please feel free to comment below if you have any queries/concerns. We will get back to you as soon as we can. Happy learning!

Источник

How to test /etc/hosts

What’s the best way to confirm that your /etc/hosts file is mapping a hostname to the correct IP address? Using a tool like dig queries an external DNS directly, bypassing the hosts file.

@mdpc I edited it to reflect that. Basically the same question though, I was just looking for a way to verify the hosts file entry is working.

3 Answers 3

I tried this out and it seems to work as expected:

echo «1.2.3.4 facebook.com» >> /etc/hosts

$ getent ahosts facebook.com 1.2.3.4 STREAM facebook.com 1.2.3.4 DGRAM 1.2.3.4 RA 

looks good, thanks! I also found that ping works: ping facebook.com outputs: PING facebook.com (1.2.3.4) 56(84) bytes of data.

I found gethostip which accepts either hostname or IP and also has options suitable to print out exactly what you need.

$ gethostip -d facebook 1.2.3.4 

You can use the ‘ping’ command to check the values added in /etc/hosts are working fine or not.

echo "1.1.1.1 abc.com" >> /etc/hosts ping abc.com 

You must log in to answer this question.

Related

Hot Network Questions

Subscribe to RSS

To subscribe to this RSS feed, copy and paste this URL into your RSS reader.

Site design / logo © 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA . rev 2023.7.17.43537

Linux is a registered trademark of Linus Torvalds. UNIX is a registered trademark of The Open Group.
This site is not affiliated with Linus Torvalds or The Open Group in any way.

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.

Источник

How to determine host value for configure when using cross compiler

General question: If I use a cross compiler, how can I tell the value of the «—host» option I should give when I run configure? Specific: I’m using cross compiler for arm64 arch. What is the correct «—host» value to use?

Though you asked for the host value, I think you really wanted the build value. host is the machine configure is running on, and you get that with config.guess . You want the triplet for build , and that is the machine the package will eventually run on. (Don’t use —target ; that is used for cross-compiling toolchains). The triplets are shared for both, but there is no easy way to get a list of the triplets. Also see How To Configure for Android? on the Autoconf mailing list.

3 Answers 3

If I use a cross compiler, how can I tell the value of the —host option I should give when I run ./configure ?

Three machines must be distinguished when discussing toolchain creation

• The build machine, where the toolchain is built.
• The host machine, where the toolchain will be executed.
• The target machine, where the binaries created by the toolchain are executed.

Four common build types are possible for toolchains are:

• Native build i.e. BUILD==HOST==TARGET
  Used to build normal gcc for workstation. e.g. BUILD==HOST==TARGET==x86
• Cross-build i.e. BUILD==HOST!=TARGET
  Used to build toolchain that works on your workstation but generates binary for target. e.g. BUILD==HOST==x86 TARGET==arm
• Cross-native build i.e. BUILD!=HOST==TARGET
  Used to toolchain that works on your target and generates binary for target. e.g BUILD==x86 HOST==TARGET==ARM
• Canadian toolchain i.e. BUILD!=HOST!=TARGET
  Used to build ARCHITECTURE A a toolchain runs on B and generates binary for architecture C. e.g. BUILD==x86 HOST==mac TARGET==arm

With armed this basics coming to your question.

For any software, first run ./configure —help

--build=BUILD configure for building on BUILD [BUILD=HOST] --host=HOST configure for HOST [guessed] --target=TARGET configure for TARGET [TARGET=HOST] 

You will find above so depending on what you want to do, you need to set it for cross compiling. If all options are available, then you want to execute on arm target then set —host= —target= .

For example, if you are using arm-none-linux-gnueabi-gcc , set —host=arm-none-linux-gnueabi —target=arm-none-linux-gnueabi . This will write to your makefile. Finally, generated executable will run on target. For —build this will be automatically set, no need to worry.

For some software package only two option available i.e host and build . here if set host is enough to cross-compile

Specific: I’m using cross compiler for arm64 arch. What is the correct —host value to use?

For x86_64, —host= is generally given, so I think the same should work for arm64 by setting —host= for your toolchain, but I’m not sure.

Источник