Cockpit is a web application that allows you to control one server or several Linux servers. Everything from a web interface that you can open from your favorite web browser. In this way, we can perform common and not so common tasks on the server with just a few clicks.

Using Cockpit It is easy to start containers, administer storage, configure networks, and inspect logs.

On the other hand, Cockpit gets along very well with after-server applications such as Ansible. This means that the integration with the server is practically complete. In addition, the application is quite well supported by its creators and is available for the largest Linux distributions.

Install Cockpit on OpenSUSE 15.1

The easiest way to install Cockpit on OpenSUSE 15.1 is through a distribution-specific repository. However, this is not enabled by default, so you have to enable it first.

Open a terminal emulator or connect to your server using ssh.

Then, add the repository with the following command:

:~$ sudo zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:cockpit/openSUSE_Leap_15.1/systemsmanagement:cockpit.repo

Adding repository 'cockpit-project.org (openSUSE_Leap_15.1)' …………………………………………………………………………………………………………………………………………………………………………………………….
 Repository 'cockpit-project.org (openSUSE_Leap_15.1)' successfully added
 URI : http://download.opensuse.org/repositories/systemsmanagement:/cockpit/openSUSE_Leap_15.1/
 Enabled : Yes                                                                                     
 GPG Check : Yes                                                                                     
 Autorefresh : No                                                                                      
 Priority : 99 (default priority)                                                                   
 Repository priorities are without effect. All enabled repositories share the same priority

Then, refresh the cache of the repositories. When you first use this repository, you will be asked to accept the repository’s GPG key. You do this by pressing the “a” key.

:~$ sudo zypper refresh
Repository 'Non-OSS Repository' is up to date.                                                                                                                           
 Repository 'Main Repository' is up to date.                                                                                                                              
 Retrieving repository 'Main Update Repository' metadata ……………………………………………………………………………………………..[done]
 Building repository 'Main Update Repository' cache ………………………………………………………………………………………………….[done]
 Repository 'Update Repository (Non-Oss)' is up to date.                                                                                                                  
 Retrieving repository 'cockpit-project.org (openSUSE_Leap_15.1)' metadata --------------------------------------------------------------------------------------------[-]
 New repository or package signing key received:
 Repository:       cockpit-project.org (openSUSE_Leap_15.1)                            
   Key Name:         systemsmanagement OBS Project systemsmanagement@build.opensuse.org
   Key Fingerprint:  50E60431 54485D99 0732B5D6 ACAA9CF7 E6E5A213                        
   Key Created:      Wed 24 Jul 2019 11:26:49 AM -04                                     
   Key Expires:      Fri 01 Oct 2021 11:26:49 AM -04                                     
   Rpm Name:         gpg-pubkey-e6e5a213-5d3878b9                                        
 Do you want to reject the key, trust temporarily, or trust always? r/t/a/?: a
 Retrieving repository 'cockpit-project.org (openSUSE_Leap_15.1)' metadata ……………………………………………………………………………..[done]
 Building repository 'cockpit-project.org (openSUSE_Leap_15.1)' cache ………………………………………………………………………………….[done]
 All repositories have been refreshed.

After that, you can install Cockpit without any problems.

:~$ sudo zypper in cockpit
Loading repository data…
 Reading installed packages…
 Resolving package dependencies…
 The following 4 NEW packages are going to be installed:
   cockpit cockpit-bridge cockpit-system cockpit-ws
 4 new packages to install.
 Overall download size: 2,4 MiB. Already cached: 0 B. After the operation, additional 3,9 MiB will be used.
 Continue? y/n/v/…? shows all options: y

Also, you can install some additional Cockpit packages:

:~$ sudo zypper in cockpit-bridge cockpit-docker cockpit-pcp cockpit-tests cockpit-ws

After installation, the cockpit service must be started:

:~$ sudo systemctl start cockpit

And then, verify that the service is running correctly:

:~$ sudo systemctl status cockpit
● cockpit.service - Cockpit Web Service
    Loaded: loaded (/usr/lib/systemd/system/cockpit.service; static; vendor preset: disabled)
    Active: active (running) since Wed 2020-01-29 13:55:23 -04; 21s ago
      Docs: man:cockpit-ws(8)
   Process: 2213 ExecStartPre=/usr/sbin/remotectl certificate --ensure --user=root --group=cockpit-ws --selinux-type=etc_t (code=exited, status=0/SUCCESS)
  Main PID: 2226 (cockpit-ws)
     Tasks: 2 (limit: 4915)
    CGroup: /system.slice/cockpit.service
            └─2226 /usr/lib/cockpit-ws
 Jan 29 13:55:22 linux-s6ig systemd[1]: Starting Cockpit Web Service…
 Jan 29 13:55:22 linux-s6ig remotectl[2213]: Generating temporary certificate using: sscg --quiet --lifetime 3650 --key-strength 2048 --cert-key-file /etc/cockpit/ws-cer>
 Jan 29 13:55:22 linux-s6ig remotectl[2213]: Error generating temporary dummy cert using sscg, falling back to openssl
 Jan 29 13:55:22 linux-s6ig remotectl[2213]: Generating temporary certificate using: openssl req -x509 -days 36500 -newkey rsa:2048 -keyout /etc/cockpit/ws-certs.d/0-sel>
 Jan 29 13:55:23 linux-s6ig remotectl[2213]: /usr/bin/chcon: can't apply partial context to unlabeled file '/etc/cockpit/ws-certs.d/0-self-signed.cert'
 Jan 29 13:55:23 linux-s6ig systemd[1]: Started Cockpit Web Service.
 Jan 29 13:55:23 linux-s6ig cockpit-ws[2226]: Using certificate: /etc/cockpit/ws-certs.d/0-self-signed.cert
 lines 1-17/17 (END)

Finally, you have to open the Cockpit ports in the firewall. Just the following command is enough:

:~$ sudo firewall-cmd --add-service=cockpit --zone=public --permanent
success

And restart the firewall service:

:~$ sudo firewall-cmd --reload
success

Now we can really use it.

Using Cockpit

Once we have installed Cockpit, we can open a favorite web browser and access https://your-server:9090

Replace your-server by the IP address of the computer or by the domain name.

You will see the following:

you must now log in with your username and password. The same ones you use for the system. Then, you will see the following:

As you can see, the system information is displayed. But you can also check the system logs on the left side.

Moreover, you can also easily create new users of the system.

You can also see the services of the system.

Cockpit even has a built-in terminal in case you need to run a command quickly.

So, enjoy it.

Conclusion

Managing a system is not an easy task, that’s why specialized applications are required to facilitate the task. Cockpit combines the simplicity of a fairly polished web interface with the robustness of having great options available.

So, share this post and join our Telegram channel.

The post How to install Cockpit on OpenSUSE 15.1? appeared first on Linux Windows and android Tutorials.

Yarn is a new JavaScript package installer and dependency manager released by Facebook. Other companies such as Google have also collaborated. With yarn, the problems of library dependencies that a web project requires are solved. Normally, it’s done manually but it’s not optimal, that’s why Yarn solves this problem.

Yarn’s performance is quite similar to that of NPM which is its direct competitor. However, the performance is somewhat superior at Yarn. Some of Yarn’s key features are security and dependency resolution speed.

Install Yarn on OpenSUSE 15.1

Yarn requires NodeJS to work. So the first step is to install it. So I recommend you to read our post about NodeJS on OpenSUSE.

How to install NodeJS on OpenSUSE 15.1?

If we use zypper to search for the yarn package, we will notice that it is not in the official repositories.

:~$ sudo zypper search yarn

However, we can use a script to install the latest available version of Yarn.

First, make sure you have curl installed.

:~$ sudo zypper in curl

Then, run this command which will download and install the latest available version of yarn.

:~$ curl -o- -L https://yarnpkg.com/install.sh | bash

As you can see at the end of the screen output, you just have to open a new terminal session so you can use yarn without problems.

Once you’ve done that, you can show the installed version and you can use it:

:~$ yarn -v

So, enjoy it.

Conclusion

If you are a web developer you need to know and use many tools to do so. That’s why it’s yarn to excel in the management of dependencies and their security. So today you have learned how to install it on OpenSUSE 15.1.

The post How to install Yarn on OpenSUSE 15.1? appeared first on Linux Windows and android Tutorials.

According to the project’s website, Atop is “an ASCII full-screen performance monitor for Linux that is capable of reporting the activity of all processes”.

Likewise, Atop allows you to monitor in real time the consumption of memory, CPU, swap and other computer resources. And using the netatop kernel module you can monitor networks as well.

So, Atop stands out for being light, fast and presenting an easy to manipulate interface. It also has the following features:

• Resource consumption by all processes.
• Utilization of all relevant resources.
• Permanent logging of resource utilization.
• Highlight critical resources

And many more features.

So, let’s install it on OpenSUSE 15.1.

Install and use atop on OpenSUSE 15.1

Atop is located in the OpenSUSE monitoring repository which makes it fairly easy to install. But first we must add the repository.

So open a terminal session and run the following command:

:~$ sudo zypper ar http://download.opensuse.org/repositories/server:/monitoring/openSUSE_Leap_15.1/ monitoring

After it is added correctly, it has to be reprioritized so that we don’t have problems installing it.

:~$ sudo zypper mr -p 70 monitoring

After that, we will have to refresh all OpenSUSE repositories.

:~$ sudo zypper refresh

Remember that the first time you use this repository, it will ask you to accept the GPG key of the repository. To do this, press the a key.

Finally, install atop on OpenSUSE using the following command:

:~$ sudo zypper in atop

Now we can use it.

Basic use of atop on OpenSUSE 15.1

Remember that the application interface is only for the terminal, so to launch it you just need to use the atop command.

:~$ atop

So, this is the default screen.

As I said before, atop is very easy to use. You only need to type a key to activate its features or its different views. Of course, which are they? Well, by pressing the h key, we will enter the help screen that will show them.

There you will have everything you can do with atop. Everything very simple, for example, I’m going to try the statistics of memory consumption. To do this I press the m key.

So, enjoy it.

Conclusion

To monitor systems there are many different applications, but atop is consolidated as a fast and stable alternative to do it. It is highly recommended to have it at hand in servers and even in a personal computer.

Please share this post and join our Telegram Channel.

The post How to install and use Atop on OpenSUSE 15.1? appeared first on Linux Windows and android Tutorials.

As we know, PHP is a programming language widely used all over the world. In fact, most of the web sites and applications use it. Therefore, it is to be assumed that most servers need it. So it is a good idea to install the latest stable version of it.

We already know that OpenSUSE is a solid and stable rock. But a lot of this is due to the testing process they do on the packages. The problem is that the versions of the packages are frozen and as time goes by they get old.

So, let us start.

Install PHP 7.4 on OpenSUSE 15.1

Installing Apache web server

So let’s get to work.

First, I’m going to install Apache web server to have a server to run PHP 7.4 on.

So, open a new terminal session and run the following:

:~$ sudo zypper in apache2

And then we proceed to start the service:

:~$ sudo systemctl enable apache2
:~$ sudo systemctl start apache2

After this, a new rule must be set in the firewall so that it can run without problems.

:~$ sudo firewall-cmd --add-port=80/tcp --permanent
success
:~$ sudo firewall-cmd --reload
success

With this Apache will be working properly.

Installing PHP 7.4

PHP 7.4 is available to OpenSUSE using an official repository called Devel. This repository in turn contains many tools for programming, such as languages and more. Within this repository there is a special one for PHP. This is the one we will use.

So add it with the following command:

:~$ sudo zypper ar http://download.opensuse.org/repositories/devel:/languages:/php/openSUSE_Leap_15.1/ php

After it has been added, it sets a lower priority for packages to be downloaded from this repository. Do this with the following command:

:~$ zypper mr -p 70 php

The next step is to refresh all the repositories. When you first use this repository, it will ask you to accept the GPG key.

:~$ sudo zypper refresh

Then you can install PHP 7.4 on OpenSUSE 15.1 as well as some of the main PHP modules.

:~$ sudo zypper in php7 php apache2-mod_php7 php7-curl php7-xmlreader php7-zip php7-pdo php7-gd php7-json php7-mysql php7-mbstring php7-openssl

Now, enable PHP 7 on Apache and restart it.

:~$ sudo a2enmod php7
:~$ sudo systemctl restart apache2

Now, let us test it.

Create a file called test.php in /srv/www/htdocs/ and add the following:

:~$ sudo nano /srv/www/htdocs/test.php

<?php
phpinfo();
?>

Save the changes and close the file.

Then, open your favorite web browser and go to http://your-server/test.php and you will see the following:

As you can see in the image PHP 7.4 is installed and working correctly.

So, enjoy it.

Conclusion

Having PHP 7.4 is a good alternative to improve the performance of our web applications created with this language. And now we know how to do it with OpenSUSE 15.1, what remains is that you can take advantage of all these improvements of the language.

If you want to know all the news of this new version I invite you to read them in this link.

The post How to install PHP 7.4 on OpenSUSE 15.1? appeared first on Linux Windows and android Tutorials.