Note: The language in some of the screenshots is not in English but the command we have executed in English language. You just need to run the given commands and execution in your screen will show based on your preferred language set on the system,

Install Zabbix on Ubuntu 16.04

The first thing we have to do is update the system in order to have the latest security updates.

sudo apt update && sudo apt –y upgrade

With this composite command, we refresh the repository cache and at the same time say yes to updates.

Once you will enter sudo password in above screen, a series of transactions will be executed as shown in below screenshot.

Once we have the system updated, the next thing we need to do is to install a basic LAMP server to run the Zabbix and mysql frontend as database manager.

sudo apt install apache2 libapache2-mod-php7.0 mysql-server-5.7 mysql-client php7.0 php7.0-mysql php7.0-curl php7.0-json php7.0-cgi php-xml php-mbstring php-bcmath

Once you will execute above command, you will be getting a sequence of executions as shown in below image.

Once the LAMP server is installed, we must edit the php. ini file to set our time zone correctly. In my case “America/Caracas”.

sudo nano /etc/php/7.0/apache2/php.ini

Once you will execute above command, you will get below screen to edit the time zone. Inside the archive, we locate the part where the time zone is established and edit it with our own.

Now we will restart Apache service using below command..

sudo systmectl restart apache2.service

Now we must add the Zabbix repository, to do this we must download a. deb file hosted on their website.

wget http://repo.zabbix.com/zabbix/3.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.4-1+xenial_all.deb

And then install it to add the repository.

sudo dpkg –i zabbix-release_3.4-1+xenial_all.deb

Now we must refresh the program sources cache and install zabbix packages. Run below command to update the repository.

sudo apt update

You can see the execution of above command.

Run below command to initiate the execution.

sudo apt install zabbix-server-mysql zabbix-frontend-php zabbix-agent

We can see the installation in below image.

Configure MySQL

In this step we must configure mysql, skip this if you already had an installation before.

sudo mysql_secure_installation

To the questions we must answer yes or no according to our needs. For this tutorial, the answers to these questions are no problem. The important thing is to remember the Mysql root password.

Then we must log in to Mysql when entering the command, we must enter the root password.

mysql –u root –p

Once inside, we must create the zabbix database.

CREATE DATABASE zabbix

We then create and give permission to a new Mysql user to use zabbix. This is a good security practice for our server.

GRANT ALL ON zabbix TO ‘zabbix’@localhost IDENTIFIED BY ‘zabbixpss’;

Replace’ zabbixpss’ with another username if you prefer, and’ zabbixpss’ with another password. you can see all above steps in below command.

Next we must “copy” the configuration of Mysql to the new zabbix user.

zcat /usr/share/doc/zabbix-server-mysql*/create.sql.gz | mysql –u zabbix –p

However at this point I got the error of “No database selected”. Don’t worry, we’ll figure it out. To fix error 1046, we must first copy and unzip the MySql creation file.

And then edit the “create.sql” file, we just must add USE zabbix; at the beginning of the file.

nano create.sql

Save and we will be able to import the file.

cat create.sql | mysql –u zabbix –p

This completes the configuration process of the database manager.

Now we proceed to edit the configuration file of zabbix to add the database parameters that the application will use.

sudo nano /etc/zabbix/zabbix_server.conf

Verify below parameters from below screenshot.

DBHost=localhost

DBName=zabbix

DBUser=zabbix

DBPassword=zabbixpss

These parameters are the ones that we have to locate in the archive and change for the positions.

Then we must restart Apache2 and Zabbix services.

sudo systemctl restart apache2.service
sudo systemctl restart zabbix-server.service

Configure Zabbix

Now, it’s ready. We have to go to our web browser and access from the ip address of the server computer.

http://IP_ADRESS/zabbix 

Then we proceed to configure it, pressing next. We check that all prerequisites are satisfied.

In this screen we must configure the database parameters that we have made in the previous steps.

Then you have to configure the server parameters. In this case, we leave it the same way.

In the end if everything is correct we should see a screen like this.

Finally we can now access through the following form:

Username: admin

Password: zabbix

And after that, we’ll have the main view with our zabbix running on the server.

As a conclusion we can say that Zabbix is a great open source application for server monitoring, its installation in server is relatively simple and is very useful to all system administrators.

Read More:

• How to Install and Use HTop on Linux system?
• Installing PgAdmin 4 on Debian Stretch
• RHEL Interview Questions and Answers

The post How to Install Zabbix on Ubuntu Server 16.04? appeared first on Techyaz.com.

HTOP is a process viewer on the terminal created for the entire Unix family but has great popularity within GNU/LINUX. The main advantages of this tool are that we can monitor processes, finalize and explore them all from the terminal which guarantees a minimum expenditure of resources.

How to Install Htop on Various Linux Systems?

We can install Htop from your sources or simply from pre-compiled packages. However, Htop is found in most GNU/LINUX distributions through its main repositories. Please have a look at the step by step process to install Htop on Debian, RHEL, Ubuntu and other Linux systems.

Install Htop on Debian 8 Jessie and Debian 9 Stretch

The first thing we need to do is login as root. Type su on your terminal window and press enter followed by typing its password.

su

Once you will be connected using su account, run below command to install Htop on Debian systems.

apt install htop

Install Htop on Ubuntu 14.04  and Ubuntu 16.04

Here, I will show you how to install Htop on Ubuntu servers. Installation of htop on Ubuntu is very much similar to installing it on Debian as we did in above section. In the case of Ubuntu, we must be root user to install htop. Type su and press enter followed by its password.

su

Once we will be connected using root user, we will proceed to install htop on Ubuntu by running below commands. A set of execution will start and execution will finish with its installation.

apt install htop

Install Htop on Fedora 26 and Fedora 27

There is little different way to install Htop on Fedora systems as we use dnf command to install it on fedora. Fedora users can easily install htop as following below steps. First we connect to root privileges using su account. Type su and its password.

su

Once we will be connected using su account, we can invoke dnf which is Fedora package manager. Run below dnf command to install htop on Fedora systems. A set of execution will start and finish with htop installation.

dnf install htop

Install Htop on Gentoo

For Gentoo we must also be root users. Write in a terminal:

su

Once we connected with root user permissions, we can install Htop by invoking Gentoo’s own package manager emerge. Run below command to start Htop installation on Gentoo system. A series of execution will start and finish with its installation.

emerge sys-process/htop

Install Htop on CentOS 7 and Red Hat Linux Enterprise

In the case of CentOS 7, we must first add the EPEL repository and then install it normally. First we logged in as root user to get installation privileges. Connect using su account by typing below command and its password.

su

Once logged in as root user, we proceed to download the package containing the EPEL repository:

wget http://mirror.pnl.gov/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

And then install the downloaded package to add the EPEL repository:

rpm -Uvh epel-release-7-5.noarch.rpm

The next step is to “validate” the newly added repository by running below command.

yum repolist

And Finally we will install htop on RHEL and Centos by running below command.

yum install htop 

Basic use of HTOP

We have installed Htop on various Linux systems in above section. We must write the command htop To launch it. Here, it is not necessary to do it as root user. You can see i wrote htop on terminal window and press enter to get the Htop task manager screen in below image.

You will get below screen once you execute above command on your terminal screen.

It’s the initial screen. As we can see, it is very simple and easy to understand. We can have fun in three parts that we will study. In this “first part” we see the use of the processor and RAM by all processes along with other details. On the right side a small summary of them: how many tasks are running and the total active time.

“Second part” also you can say middle part is the main view where all the processes are showing. You can see this in below image.

This is where we have the information through columns that contain details about these processes. The columns are:

• PID: Displays the process identifier number.
• User: The user tells us that he has activated this process.
• PRI: It shows the priority with which the process is executed.
• NI: Shows the priority level
• VIRT: The number of virtual memory used by the process.
• RES: Used ram memory (Megabytes)
• SHR: Shared memory used
• S: Process status (Running, sleeping or zombie)
• CPU%: percentage of CPU used by the process
• MEM%: percentage of ram memory used by the process
• TIME+: Active life-time of the process
• Command: The command that executes the process.

So with this we have all the information of the processes that are running at that time.

The “last part” displays the tools provided by Htop for navigation. For example, allows us to search, sort the processes and the best, for me, the “kill” processes by using shortcut keys.

To kill a process we must navigate through the processes with the up and down keys, select it, press the F9 key, and choose the number that corresponds to the option of killing that serves us. I almost always use the 9th showing in below screen.

In conclusion we can say that Htop is a great tool to visualize the active and non-active processes in our Linux systems. Being terminal-based, it has the advantage of consuming virtually nothing in resources and helps us to close very heavy or unnecessary processes.

Here i have shown you how to install Htop on Red Hat, Ubuntu, Fedora and Debian systems and its uses. I hope you like this article. Please follow our Facebook page and Twitter handle to get latest updates.

Read More:

• How to Install Debian 9 Stretch?
• How to Install Zebbix on Ubuntu 16.4?
• How to Install RedHat Enterprise Linux?
• Installing Ubuntu 16.04 in Step by Step Process

The post How to Install Htop and Use it to Monitor Linux Processes? appeared first on Techyaz.com.

PostgreSQL is for many the best in its area, and it is not the aim of this article to defend or support that theory, what we can say with all certainty is that it is one of the most robust and secure database handlers that exist. As if this were not enough, it has one of the most popular and complete graphical tools to manage it, such as pgAdmin.

As the project website says: “pgAdmin is the most popular and feature rich Open Source administration and development platform for PostgreSQL, the most advanced Open Source database in the world.” And of course we can install it in our preferred GNU/LINUX distribution. In this case we are going to install it in our Debian 9 Stretch a large GNU/LINUX distribution widely used in the server and database area.

Install pgAdmin 4 on Debian 9 Stretch

Note: In this tutorial it is assumed that you have postgreSQL installed, otherwise, we must install it. You can find the way of doing it in below link.

• How to Install PostgreSQL 10.1 on Debian 9 Stretch

Let’s get started. The first thing we have to do is add the postgreSQL apt repository. If you have installed postgreSQL with the tutorial we have attached above, you can skip these steps. Otherwise we must add it.

First we logged in as root user. Write su in your terminal screen along with its password and press enter to connect.

#Connect using root user
su

Now, use below command to create the pgdp.list file in the /etc/apt/source.list.d/ path.

nano /etc/apt/source.list.d/pgdg.list

Here, we will add the next line of code to the terminal screen that will come after executing above command.

deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main

Press ctrl + x to exit and select yes to save the changes.

Now import the repository signing key by running below commands on your terminal screen.

#Import the repository signing key
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -

And to refresh the repository cache, just run the following command.

#Refresh the repository.
apt update

You can see all packages have been updated in above screenshot. Now we are ready to start installing pgAdmin 4.

Installing Dependencies and Creating the Virtual Environment

We must install the necessary dependencies to handle the package. They are basically Python dependencies that needs to be resolved before installing pgadmin package. Execute below command in your terminal before going to install pgadmin.

#Install Python dependency.
apt install virtualenv python-pip libpq-dev python-dev

Type Y and press enter to install this dependency. The next step will be to create the virtual environment. In this case we will create it on /home/Your_user/. Run below commands to get this done.

#Go to your directory.
cd /home/your_user/

#Create Virtual Environment.
virtualenv pgadmin4

This creates a folder called “pgadmin4“. We must enter it to get in to this folder.

cd pgadmin4

The next step will be to “activate” the virtual environment by running below statement.

#Activate virtual environment.
source bin/activate

Downloading and Installing pgAdmin

Now, we will install pgadmin on this machine. We can download latest version pgAdmin4-2.1 from this link. For this tutorial we will use the python package that is showing in below screenshot.

And finally we will proceed to install pgadmin using pip command as given below.

#Replace <path-where-file-is-located> with your patch followed by file name.
pip install <path-where-file-is-located>

We will be running below command in our case.

#Run below command to install pgadmin.
pip install /home/angelo/Descargas/pgadmin4-2.1-py2.py3-none-any.whl

With this pgAdmin is already installed but we are not finished yet. You need to create a local configuration and run it. Run below command to do this.

#Go to pgadmin4 folder
cd lib/python2.7/site-packages/pgadmin4

#Create config file
touch config_local.py

The “touch” command creates an empty file from the linux terminal, if the file exists it will change the date and time of the modification. In that file we can place the settings we want, if the file is left empty it will take the global settings of python.

We can now execute below command to create the credentials. Once you run below command, it will ask you to enter your email address and password. Those credentials will be the ones we use to access the application from the browser.

python lib/python2.7/site-packages/pgadmin4/pgAdmin4.pyc

Now we have created the credentials as well in above screenshot. At the end, we will be told that we must log in with our favorite browser to 127.0.0.1:5050 to log in and enter the main page of pgAdmin.

Let’s go to our browser and type 127.0.0.1:5050

We put our email address and the password we have previously entered. We can also select the language. Once we will be logged in using given credentials, we can see the main pgAdmin panel that is also showing in below screenshot.

We can test the application by adding a server. In this case it will be a local server. We must click on the “Add new Server” link given in between Quick Link section. We will get below screen to enter details about the server that we want to add.

The name we want to give to the connection is placed in the window. I called it “local.” We’ll leave the rest the same, if we want to.

In the connection tab, we will enter the connection parameters Host name, port, database, username, and password to add the server. You can see this in beow screenshot.

And with this we already have an added server and we can start working with postgreSQL. You can see the server is added in left side pane of pgAdmin panel. You can expand the plus sign to see the details like databases etc.

Conclusion

We have installed pgadmin 4 in debian 9 stretch to manage PostgreSQL databases. Data management is vital to system administration and specialized programs are required to keep data secure and properly structured. Complementing PostgreSQL we have pgAdmin that helps us, with a friendly graphical interface, to manage our databases, to make sentences and to monitor the service.

Installing both is one of the best ways to have and view databases in a way that is appropriate for our applications.

I hope you like this article. Please Like, Share, Comment & Subscribe to this website to get all new articles directly in your inbox. You can also follow our Facebook page and Twitter handle to get latest updates.

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