Now your FTP server is up and running. It is time to add additional users to FTP server so that they can login into account to upload / download files. To add a user called tom and set the password, enter:# adduser -c 'FTP USER Tom' -m tom# passwd tom
Now tom can login using our ftp server. Make sure the following is set in vsftpd.conf
local_enable=YES
Restart the vftpd:# service vsftpd restart
How do I install gnu gcc compiler and related tools such as autoconf, automake, flex, c++ compiler, and bison on a CentOS 7 or Red Hat Enterprise Linux version 7 server?
You can setup a basic development environment with the following packages on a CentOS Enterprise Linux or Red Hat Enterprise Linux version 7:
Open the Terminal app and type the following commands.
Type the following yum command:# yum group list
Sample outputs:
Fig. 01: CentOS / RHEL 7: List Package Groups Command
Type the following [nixcmd name="yum" as root user:# yum group install "Development Tools"
OR$ sudo yum group install "Development Tools"
Sample outputs:
Type the following command to see gcc location:
$ whereis gcc
gcc: /usr/bin/gcc /usr/lib/gcc /usr/libexec/gcc /usr/share/man/man1/gcc.1.gz
Type the following command to see gcc compiler version:
$ gcc --version
gcc (GCC) 4.8.2 20140120 (Red Hat 4.8.2-16)
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Create a file called foo.c as follows:
#include<stdio.h>
int main(void){
printf("Hello World!\n");
return 0;
}
To compile foo.c into foo executable file, type:$ cc foo.c -o foo
To execute foo program, type:
$ ./foo
Hello World!
I recently installed CentOS Linux version 7 or Red Hat Enterprise Linux version 7. How can I restart networking service using command line options? How can I start / stop and restart networking service on a CentOS/RHEL 7 based system?
CentOS 7 / RHEL 7 / Fedora Linux (many other modern distor) uses Systemd. It is a system and service manager for Linux operating systems. In newer distro such as CentOS7/RHEL7 systemd replaces Upstart as the default init system.
In older versions of CentOS or Red Hat Enterprise Linux, you used init scripts located in the /etc/rc.d/init.d/ directory. These init scripts were typically written in Bash, and allowed the system administrator to control the state of services and daemons in their system. In CentOS/RHEL 7, these init scripts have been replaced with service units.
To bring up/down networking service you need to use the network.service.
Use this command to control the systemd system and act as a service manager.
sudo systemctl status network.service
OR
sudo systemctl status network
Sample outputs:
Fig.01: CentOS / RHEL 7 Networking Service Status Command
sudo systemctl restart network.service
OR
sudo systemctl restart network
sudo systemctl start network.service
OR
sudo systemctl start network
sudo systemctl stop network.service
OR
sudo systemctl stop network
Sample outputs:
Animated gif 01: systemctl command in action
The service and chkconfig commands are still available in the system and work as expected, but are only included for compatibility reasons and should be avoided as may be dropped in future release.
Install EPEL Repo on a CentOS and RHEL 7.x
How do I install the extra repositories such as Fedora EPEL repo on a Red Hat Enterprise Linux server version 7.x or CentOS Linux server version 7.x?
You can easily install various packages by configuring a CentOS 7.x or RHEL 7.x system to use Fedora EPEL repos and third party packages. Please note that these packages are not officially supported by either CentOS or Red Hat, but provides many popular packages and apps.
The following instuctions assumes that you are running command as root user on a CentOS/RHEL 7.x system and want to use use Fedora Epel repos.
The command is as follows to download epel release for CentOS and RHEL 7.x using wget command:
cd /tmp
wget https://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm
ls *.rpm
To install epel-release-7-2.noarch.rpm, type:
sudo yum install epel-release-7-2.noarch.rpm
Sample outputs:
Loaded plugins: amazon-id, rhui-lb
Examining epel-release-7-2.noarch.rpm: epel-release-7-2.noarch
Marking epel-release-7-2.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:7-2 will be installed
--> Finished Dependency Resolution
Dependencies Resolved ================================================================================
Package Arch Version Repository Size================================================================================
Installing:
epel-release noarch 7-2 /epel-release-7-2.noarch 22 k
Transaction Summary================================================================================
Install 1 Package
Total size: 22 k
Installed size: 22 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : epel-release-7-2.noarch 1/1
Verifying : epel-release-7-2.noarch 1/1
Installed:
epel-release.noarch 0:7-2
Complete!
Once installed you should see epel repo using the following yum repolist command$ sudo yum repolist
Sample outputs:
Loaded plugins: amazon-id, rhui-lb
repo id repo name status
epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 5,610
rhui-REGION-client-config-server-7/x86_64 Red Hat Update Infrastructure 2.0 Client Configur 2
rhui-REGION-rhel-server-releases/7Server/x86_64 Red Hat Enterprise Linux Server 7 (RPMs) 4,718
repolist: 10,330
To list all available packages under a repo called epel, enter:$ sudo yum --disablerepo="*" --enablerepo="epel" list available
OR$ sudo yum --disablerepo="*" --enablerepo="epel" list available | grep 'package'
OR$ sudo yum --disablerepo="*" --enablerepo="epel" list available | less
Sample outputs:
Fig. 01: List all available packages under a EPEL Repo on a CentOS/RHEL/Fedora Linux
The commands are as follows:
## search it ##
sudo yum search htop
## get more info, if found ##
sudo yum info htop
## install it ##
sudo yum install htop
And, there you have it, a larger number of packages to install from EPEL repo on a CentOS and Red Hat Enterprise Linux (RHEL) version 7.x.