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CentOS is a free version of the Red Hat Enterprise Linux operating system. It is built from the same source code as Red Hat and is designed to be used in a business environment. Unlike Red Hat, it does not require a license agreement to deploy or use. Most of the Linux configuration files are plain text and can be edited with either the Gedit graphical editor in GNOME or the Vi command line text editor, depending on your preference.
Graphical User Interface
1.
Double-click on the 'Home' folder on the desktop and navigate to the file you want to edit.
2.
Double-click on the file icon to open the file in the Gedit text editor.
3.
Edit the document using the mouse to navigate through the text and the keyboard to make changes.
4.
Save your changes by pressing the 'Ctrl-S' keys simultaneously or choose the 'Save' option under the 'File' menu.
5.
Close the file by clicking on the 'X' button or by choosing the 'Close' option under the 'File' menu.
Command Line
1.
Right-click on the desktop and choose the 'Open in Terminal' option from the menu that appears.
2.
![How To Install Notepad In Centos 7 How To Install Notepad In Centos 7](https://i.stack.imgur.com/iTACp.png)
Type the cd command at the command prompt, followed by the name of directory that contains the text file:
cd directory_name
3.
Type the vi command followed by the name of the file to open the file in Vi:
vi file_name.txt
4.
Use the keyboard to navigate through the file. Press 'j' to move the cursor down, 'k' to move the cursor up, 'h' to move the cursor left and 'l' to move the cursor right.
5.
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Press the 'i' key to insert text into the file.
6.
Press the 'Esc' key to return to normal mode to continue navigating through the file.
7.
Type ':wq' on the keyboard to save and close the file.
Tip
- Type ':help' while in the Vi text editor to view all of the commands available.
References (2)
About the Author
Kristen Waters has been writing for the computer industry since 2004. She has written training materials for both large and small computer companies as well as how-to and informative articles for many online publications. She holds Bachelor of Science degrees from both York College of Pennsylvania and the University of Maryland.
Photo Credits
- Hemera Technologies/AbleStock.com/Getty Images
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As we all know, Notepad++ is a very common and popular text editor on Microsoft Windows. Although Notepad++ is open source and licensed under GPL, it uses pure Win32 API. So compiling it on Linux is very hard. Notepadqq is a free and open source alternative to Notepad++. Today we’re going to look at how to install Notepadqq on Debian, Ubuntu, Linux Mint, Elementary OS and Arch Linux.
Install Notepadqq on Ubuntu 14.04/15.10/16.04/Linux Mint/Elementary OS
For Ubuntu-based Linux distributions, we can install it from PPA. First, use add-apt-repository
Spider man shattered dimensions review. utility to add PPA.
Then update local package index.
Install Notepadqq.
Now you can launch it from Unity Dash or application menu.
Install Notepadqq on Debian 8 Jessie
We can also install Notepadqq on Debian 8 Jessie from the same PPA. But as we all know, Debian does not support adding PPA using the add-apt-repository
command. So we have to add the PPA manually.
First create a separate source list file under /etc/apt/source.list.d/
directory with nano editor or your favorite editor.
Add these two lines in the file.
Notice that the codename is trusty (Ubuntu 14.04) because most of the time packages made for trusty can be safely installed on Debian 8 as well and generally you don’t have to worry about dependency problem.
![Install Install](https://www.javatpoint.com/centos/images/how-to-install-notepadqq-on-centos5.png)
Save and close the file. Now import the GPG key of Notepadqq to Debian by using apt-key
command.
Then update local package index.
Install Notepadqq.
For those of you who are curious, when adding PPA using add-apt-repository
command on Ubuntu-based distributions, there will be a separate source list file created under /etc/apt/sources.list.d/
directory. All PPA repositories are stored in those separate source list files. You can check them out with ls command:
Install Notepadqq on Arch Linux
You can easily install Notepadqq from AUR with Yaourt package manager.
Check out the following post if you are not familiar with Yourt package manager.
How to Remove Notepadqq
If for any reason you don’t like this notepad++ alternative for Linux, use the following commands to remove it from your system.
Ubuntu-based distributions
The second command is for removing the Notepadqq PPA.
Debian 8
Arch Linux
That’s it! Enjoy!
Notepadqq is a free linux alternative to the most widely used text editor Notepad++. This is an ideal app developed to help developers, by providing all features you can expect from a general purpose text editor, such as syntax highlighting, code folding, color schemes, file monitoring, multiple selection and much more.
You can search text using the power of regular expressions, as well as organize documents side by side. Furthermore, you can use real-time highlighting to find near identifiers in no time.
Irrespective of the country you from or language you speak, you now have over 100 supported languages, hence making it the ideal global text editor.
Why choose Notepadqq
- The app comes with various color scheme to choose from. Whether you are a dark theme guy or a light one, you’ll find your favourite color scheme.
- Notepadqq focuses more on the content, without unnecessary fancyness.
- In addition to this, it gives you a hand with multiple selection, regular expression searches, and real-time highlighting.
A look at the key Features
- Provides you with Syntax Highlighting as well as Syntax Folding
- Comes with a powerful Regular Expression Search/Replace
- Multi-Document (Tab interface)
- Multi-View, as well as support for Multi-Language environment
- code folding
- color schemes supported
- file monitoring
- Zoom in as well as zoom out
- Convert case to lower or upper
- Light weight app
- Many features available
- More menu options are there in top to perform all actions
How to install latest Notepadqq 0.53.0 on Ubuntu 17.04, Ubuntu 16.10, Ubuntu 16.04, Ubuntu 15.04, Ubuntu 14.04
How to remove it from Ubuntu 17.04, Ubuntu 16.10, Ubuntu 16.04, Ubuntu 15.04, Ubuntu 14.04
How to install on Fedora 20 and its derivatives
How to remove app from Fedora 20 and its derivatives
How to install on Arch linux, Manjaro Distro and others
How to remove app from Arch linux, Manjaro Distro and others
Kubernetes is an open-source system used for automating the deployment, scaling, and management of containerized applications. Kubernetes is enterprise-ready and can be installed on various platforms. I've already touched on how to get Kubernetes up and running on Ubuntu Server (see 'How to quickly install Kubernetes on Ubuntu'). This time around, I'm going to walk you through the process of setting up a Kubernetes cluster on CentOS 7. This makes for an outstanding one-two punch for your containerized applications.
SEE: Quick glossary: Storage (Tech Pro Research)
What you'll need
I'll be demonstrating with three CentOS 7 servers (at the following IP addresses):
- kubemaster: 192.168.1.99
- kube2: 192.168.1.109
- kube3: 192.168.1.167
Make sure to change the IP addresses to fit your needs. You'll also need root access on all three servers. I do suggest first testing this on virtual machines, before attempting the installation on production servers.
With that said, let's install.
Pre-installation configuration
The first thing you want to do is configure your /etc/hosts file, so that each machine can ping one another via hostname. So on each machine, issue the su command (to change to the root user) and then edit the file with the command nano /etc/hosts. At the end of the file, append the following (again, adjusting the IP addresses to fit your needs):
Save and close that file.
Disable SELinux and swap
Now we need to disable both SELinux and swap. On all three machines, issue the following commands:
Next, disable swap (on all three machines) with the following command:
We must also ensure that swap isn't re-enabled during a reboot on each server. Open up the /etc/fstab and comment out the swap entry like this:
Enable br_netfilter
For our next trick, we'll be enabling the br_netfilter kernel module on all three servers. This is done with the following commands:
Install Docker-ce
It's time to install the necessary Docker tool. On all three machines, install the Docker-ce dependencies with the following command:
Next, add the Docker-ce repository with the command:
Install Docker-ce with the command:
Install Kubernetes
This is also done on all three servers. First we need to create a repository entry for yum. To do this, issue the command nano /etc/yum.repos.d/kubernetes.repo and then add the following contents:
Save and close that file. Install Kubernetes with the command:
Once the installation completes, reboot all three machines. As soon as each machine has rebooted, log back in and su to the root user.
Cgroup changes
Now we need to ensure that both Docker-ce and Kubernetes belong to the same control group (cgroup). By default, Docker should already belong to cgroupfs (you can check this with the command docker info | grep -i cgroup). To add Kubernetes to this, issue the command:
Restart the systemd daemon and the kubelet service with the commands:
How To Install Notepad On Windows
Initialize the Kubernetes cluster
![How How](https://www.javatpoint.com/centos/images/how-to-install-wine-on-centos4.png)
We're now ready to initialize the Kubernetes cluster. This is done on kubemaster (and only on that machine). On kubemaster, issue the command (again, adjusting the IP addresses to fit your needs):
When this completes (it'll take anywhere from 30 seconds to 5 minutes), the output should include the joining command for your nodes (Figure A).
Figure A
Once that completes, head over to kube2 and issue the command (adjusting the IP address to fit your needs):
Where TOKEN and DISCOVERY_TOKEN are the tokens displayed after the initialization command completes.
Configuring Kubernetes
Before Kubernetes can be used, we must take care of a bit of configuration. Issue the following three commands (to create a new .kube configuration directory, copy the necessary configuration file, and give the file the proper ownership):
Deploy flannel network
Now we must deploy the flannel network to the cluster with the command:
Checking your nodes
Once the deploy command completes, you should be able to see both nodes on the master, by issuing the command kubectl get nodes (Figure B).
Figure B
All ready
Congratulations, you now have a Kubernetes cluster ready for pods. I'll be demonstrating how to deploy your first pod when next we visit the Kubernetes topic. Until then, happy clustering!
Also see
- How to deploy NGINX on a Kubernetes cluster (TechRepublic)
- 10 Kubernetes tips for getting the most out of the open source container system (TechRepublic)
- How to use Antsle to quickly deploy a virtual machine (TechRepublic)
- How to easily edit a network connection on a CentOS 7 minimal installation (TechRepublic)
- Red Hat introduces Kubernetes Operators software development toolkit (ZDNet)
Updated by Edward Angert Written by Linode
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Apache is an open-source web server that can be configured to serve a single or multiple websites using the same Linode. This guide explains how to install and configure the Apache web server on CentOS 7.
NoteThis guide is written for a non-root user. Commands that require elevated privileges are prefixed with sudo
. If you’re not familiar with the sudo
command, you can check our Users and Groups guide.
Replace each instance of example.com
in this guide with your site’s domain name.
Before You Begin
Ensure that you have followed the Getting Started and Securing Your Server guides, and the Linode’s hostname is set.
To check your hostname run:
The first command should show your short hostname, and the second should show your Fully Qualified Domain Name (FQDN).
Update your system:
Apache
Install and Configure Apache
Install Apache 2.4:
Modify
httpd.conf
with your document root directory to point Apache to your site’s files. Add the<IfModule prefork.c>
section below to adjust the resource use settings. The settings shown below are a good starting point for a Linode 2GB:Note
Before changing any configuration files, we recommend that you make a backup of the file. To make a backup:
cp /etc/httpd/conf/httpd.conf ~/httpd.conf.backup
- /etc/httpd/conf/httpd.conf
These settings can also be added to a separate file. The file must be located in the
conf.module.d
orconf
directories, and must end in.conf
, since this is the format of files included in the resulting configuration.
Configure Name-based Virtual Hosts
You can choose many ways to set up a virtual host. In this section we recommend and explain one of the easier methods.
Within the
conf.d
directory createvhost.conf
to store your virtual host configurations. The example below is a template for websiteexample.com
; change the necessary values for your domain:- /etc/httpd/conf.d/vhost.conf
Additional domains can be added to the
vhost.conf
file as needed. To add domains, copy theVirtualHost
block above and modify its values for each additional virtual host. When new requests come in from the internet, Apache checks which VirtualHost block matches the requested url, and serves the appropriate content:Note
ErrorLog
andCustomLog
entries are suggested for more specific logging, but are not required. If they are defined (as shown above), thelogs
directories must be created before you restart Apache.Create the directories referenced above:
Enable Apache to start at boot, and restart the service for the above changes to take effect:
You can now visit your domain to test the Apache server. A default Apache page will be visible if no index page is found in your Document Root as declared in
/etc/httpd/conf/httpd.conf
:
Configure firewalld to Allow Web Traffic
CentOS 7’s built-in firewall is set to block web traffic by default. Run the following commands to allow web traffic:
Centos How To Install Software
Next Steps: Add SSL for Security and Install GlusterFS for High Availability
Congratulations! You’ve set up Apache and you’re now ready to host websites. If you’re wondering what additional configuration changes are available to get the most out of your server, some optional steps can be found below.
Secure Your Site with SSL
To add additional security to your site, consider enabling a Secure Sockets Layer (SSL) certificate.
Install and Configure GlusterFS, Galera, and XtraDB for High Availability
Consult our Host a Website with High Availability guide to mitigate downtime through redundancy, monitoring, and failover.
More Information
You may wish to consult the following resources for additional information on this topic. While these are provided in the hope that they will be useful, please note that we cannot vouch for the accuracy or timeliness of externally hosted materials.
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This guide is published under a CC BY-ND 4.0 license.