Linux stop all network services

How to «shut off» all networking on Linux from bash?

I’d like to write a bash/shell script that «turns off» the machine’s ability to communicate over it’s network card, effectively shutting down all networking. From the command line:

# To turn all networking off sh networking.sh OFF # Then to turn it back on sh networking.sh ON 

The only way I can think of doing this would be at the port-level via IPTABLES , but having never experimented with that before, I’m not sure if I’m even heading down the right avenue or if I’m way off base. Thanks in advance.

If you have aq simply setup then this would bring all ethernet devices down. for n in ifconfig -a | grep eth | cut -d ‘ ‘ -f 1 ; do bringing down echo $n ; ifconfig $a down ; done (ifconfig -a showing all devices. Grep filters down to lines containing eth. Cut first field (separated by spaces). And for to loop through all the answers. Kludgy, but works.

Thanks @Hennes (+1) — can you explain what «aq» is? Also this would work for ethernet devices, but what if the machine has a Wifi adaptor? Is there a solution that works for both wired/wireless. I would imagine that both use ports, which is why I had started looking into IPTABLES . Thanks again!

On GNU/Linux all Ethernet devices seem to be named to ethX (with X starting at 0 for the first, 1 for the second device, 3 for the third, . ). I think that this includes wireless. However note that this is only to bring things down via ifconfig. Ifconfig is used on almost all unices but Linux seems to be moving away from it to a ‘new’ tool called ‘ip’. Also not that while it will work for bringing the network DOWN you want a better answer to bring things up again.

Thanks again @Hennes — how about trickle? It looks like I could just run trickled (trickle daemon) with up/download bandwidths set to 0 . My only question is: how do I restore the up/download bandwidths when I want to bring the network back «up».

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Linux network services: How to start, stop, and check their status

A service (also called a daemon process) is software that runs on a computer, generally in the background. This is usually because it’s something that the administrator isn’t likely to interact with directly.

Training & certification

For instance, a network service runs at the application layer to provide some form of service over a network. It’s expected that client computers will contact the service for access. A common example is the Apache web server. It runs on a system so that devices connected to the internet can view a specific set of files on a computer.

Red Hat Enterprise Linux (RHEL) provides an environment where these network services can run. RHEL also provides a utility named systemd to help you manage these services.

systemd has been the default service manager since RHEL 7. It’s the first thing that gets started (PID 1), and it is responsible for starting the rest of the system. It activates server daemons, system resources, and various other processes. With systemd, you can start, stop, and check the status of the network services running on your server. You interact with systemd by using the systemctl command.

Start a service

To start a given service, use:

For example, to start the sshd service, type:

$ sudo systemctl start sshd.service

You can ignore .service and run the systemctl start sshd command.

List services

You can list all loaded services on a server with:

$ sudo systemctl list-units --type=service

Stop a service

To find out whether a service is running, inactive, enabled, disabled, or has exited, use:

$ sudo systemctl status sshd

The systemctl command also has is-active and is-enabled options to see whether a service is active or enabled. For example, to check if a service is active or enabled, run:

This command gives two possible outputs. The service is either active , which means it is running, or it’s inactive , which means it is stopped or not running.

Enable a service

You can configure a service to start automatically with the system so that you don’t have to start it manually after the server reboots or restarts.

To enable a service, which means the service starts automatically when the server boots, use:

$ sudo systemctl enable sshd

To both start and enable a service, add the —now option, like this:

$ sudo systemctl enable --now sshd

To check whether a service is enabled, enter:

$ sudo systemctl is-enabled sshd

When a service is enabled, it starts automatically at boot. When it’s disabled, it doesn’t start automatically at boot.

Disable a service

To disable a service, so the service will not start automatically at boot time, run:

$ sudo systemctl disable sshd

Wrap up

Not everything uses systemctl by default. Some applications are intended to be started manually. Of course, you can always add your own systemd service files when you need a network service to start automatically.

Systemd is full of features, and the systemctl command gives you easy control over the services your computer runs.

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How to stop all services

I’m looking for a command to stop all services running and probably restart them after. Any help would be appreciated.

2 Answers 2

assuming you are using ubuntu 16.04 you can use systemctl to control services.

to get a list of services and their status

to control an individual service , replace service with the service name

systemctl status service systemctl stop service systemctl start service 

in older version of ubuntu services can be controlled via init scripts which live in /etc/init.d , these work in a similar way

to get a list of services

to contrl and individual service

/etc/init.d/service status /etc/init.d/service stop /etc/init.d/service start 

Although I highly recommend rebooting the machine instead, you can write a command to achieve this:

Note: This may force a machine reboot halfway through at which point this effort is profitless.

for s in `systemctl | grep service | cut -d '.' -f 1`; do sudo systemctl restart $s; done 

I would instead list all currently running services, identify the ones I want to stop, then manually restart each service:

Note: restart internally calls start + stop so you won’t have to perform them separately.

1. List currently running services: systemctl | grep running
2. Restart each service by typing: systemctl restart

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How To start/Stop/Restart Network Service on Ubuntu or Debian Linux

If you are working on a Ubuntu Linux system, and you may be need to set IP address for a given enternet interface or you need to change network settings by modifying networking configuration file called interfaces located in the /etc/network directory using your vim text editor. or you can use cat command to dispaly the content of the current networking configuration file, type:

$ sudo vim /etc/network/interfaces

devops@devops:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback auto enp0s3 iface enp0s3 inet dhcp

Starting Network Service in Ubuntu

If your network service daemon is stopped, and you may be need to start it by using the following command:

$ sudo systemctl start networking.service

$ sudo /etc/init.d/networking start

Stop Network Service in Ubuntu

If you wish to stop a network service in your Ubuntu or Debian Linux, and you can type the following comand:

$ sudo systemctl stop networking.service

$ sudo /etc/init.d/networking stop

Restart Network Service in Ubuntu

If you modified networking configuration in your Ubuntu system, and you need to restart its service by using the following command:

$ sudo systemctl restart networking.service

$ sudo /etc/init.d/networking restart

Checking Status of Networking Service

If you need to check the current status of networking service in your Ubuntu system, and you can issue the following command:

$ sudo systemctl status networking.service

$ sudo /etc/init.d/networking status

devops@devops:~$ sudo systemctl status networking.service networking.service - Raise network interfaces Loaded: loaded (/lib/systemd/system/networking.service; disabled; vendor preset: enabled) Active: active (exited) since Tue 2019-10-08 02:59:03 EDT; 18min ago Docs: man:interfaces(5) Main PID: 1158 (code=exited, status=0/SUCCESS) Tasks: 0 (limit: 1121) CGroup: /system.slice/networking.service Oct 08 02:58:59 devops systemd[1]: Starting Raise network interfaces. Oct 08 02:59:03 devops systemd[1]: Started Raise network interfaces.

Enabling Netowrk Service in Ubuntu

If you want to enable your network service at system boot on your Ubuntu system, and you can run the following command:

$ sudo systemctl enable networking.service

devops@devops:~$ sudo systemctl enable networking.service Synchronizing state of networking.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install enable networking

Disabling Network Service in Ubuntu

If you want to diable network service at system boot, just using the following command:

$ sudo systemctl disable networking.service

Conclusion

You should know that how to start/stop/restart/enable/disalbe network service in your Ubuntu or Debian L Linux system.

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How To Start, Stop, Restart Networking On Linux?

I have changed my network configuration and want to restart to make changes effective. Or there are some problems with my network and I think restarting it will solve my problems. Here we will look at how to restart networking service in various network distributions like Ubuntu, Debian, Fedora, CentOS.

Get Status Of Network Service

We will get status of network with the following command.

Debian, Ubuntu, Kali

For deb based distributions we will use init.d system. We will provide status option to the networking script.

$ /etc/init.d/networking status

As we cab see that networking service is active from given date. Its PID is 897 .

Fedora, CentOS

For distributions like CentOS, RedHat, Fedora we will use systemctl command. We will provide the options status and network which is the networking service.

Stop Network Service

We can stop network like below. Bu keep in mind for remote connection it can be create problems with ssh

Ubuntu, Debian, Kali

We will use stop option with networking command in order to stop network services in Ubuntu, Debian, Kali, Mint etc.

$ sudo /etc/init.d/networking stop

Fedora,CentOS

We will use systemctl again with stop option which will stop network services. We also require root privileges that will beget with sudo command.

$ sudo systemctl stop network

Start Network

We can start network like below.

Ubuntu, Debian, Kali

We will provide start option in order to start network services in deb based distributions.

$ sudo /etc/init.d/networking start

Fedora,CentOS

We will use start network option in order to start network services in rpm based distributions.

$ sudo systemctl start network

Restart Network

Now we can restart our network or network services.

Ubuntu, Debian, Kali

$ /etc/init.d/networking restart

Fedora,CentOS

$ systemctl restart network

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