RHEL/CentOS – How to install NGINX

Pre-requisites:

make sure EPEL is enabled – see here.

Once that is done just issue:

yum install nginx

and when installed enable the service so it starts with they OS:

[root]# chkconfig nginx
Note: Forwarding request to 'systemctl is-enabled nginx.service'.
disabled
[root]# chkconfig nginx on
Note: Forwarding request to 'systemctl enable nginx.service'.
Created symlink from /etc/systemd/system/multi-user.target.wants/nginx.service to /usr/lib/systemd/system/nginx.service.
[root]# chkconfig nginx
Note: Forwarding request to 'systemctl is-enabled nginx.service'.
enabled

RHEL/CentOS – How to enable EPEL Repository

What is EPEL?

EPEL (Extra Packages for Enterprise Linux) is a volunteer-based community effort from the Fedora project to create a repository of high-quality add-on packages that complement the Fedora-based Red Hat Enterprise Linux (RHEL) and its compatible spinoffs, such as CentOS and Scientific Linux.

Why?

  1. it provides tons of open source packages that can be installed via YUM
  2. maintained by Fedora – therefore trusted

How?

## RHEL/CentOS 7 64-Bit ##
# wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
# rpm -Uvh epel-release-7-5.noarch.rpm
## RHEL/CentOS 6 32-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
# rpm -Uvh epel-release-6-8.noarch.rpm

## RHEL/CentOS 6 64-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh epel-release-6-8.noarch.rpm
## RHEL/CentOS 5 32-Bit ##
# wget http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
# rpm -Uvh epel-release-5-4.noarch.rpm

# wget http://download.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
# rpm -Uvh epel-release-5-4.noarch.rpm
## RHEL/CentOS 4 32-Bit ##
# wget http://download.fedoraproject.org/pub/epel/4/i386/epel-release-4-10.noarch.rpm
# rpm -Uvh epel-release-4-10.noarch.rpm

## RHEL/CentOS 4 64-Bit ##
# wget http://download.fedoraproject.org/pub/epel/4/x86_64/epel-release-4-10.noarch.rpm
# rpm -Uvh epel-release-4-10.noarch.rpm

once the package is installed update yum and verify that epel is in on our repo list:

[root]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.strencom.net
 * epel: epel.check-update.co.uk
 * extras: mirror.strencom.net
 * updates: mirror.strencom.net
No packages marked for update
[root]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.strencom.net
 * epel: epel.check-update.co.uk
 * extras: mirror.strencom.net
 * updates: mirror.strencom.net
repo id                                 repo name              status
base/7/x86_64                           CentOS-7 - Base        9,007
epel/x86_64                             Extra Packages for Enterprise Linux 7 - x86_64        9,111
extras/7/x86_64                         CentOS-7 - Extras        191
updates/7/x86_64                        CentOS-7 - Updates       369
repolist: 18,678

 

LINUX – IP aliasing

To quote mighty Wikipedia: “IP aliasing is associating more than one IP address to a network interface. With this, one node on a network can have multiple connections to a network, each serving a different purpose”

Debian, Ubuntu

To perform IP aliasing in Debian based system (assuming you’re using eth0), edit /etc/network/interfaces as follows:

auto eth0:1
iface eth0:1 inet static
address 10.0.0.10
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
gateway 10.0.0.1

auto eth0:2
iface eth0:2 inet static
address 10.0.0.11
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
gateway 10.0.0.1

In the above example we create two virtual NICs out of eth0: eth0:1 10.0.0.10) and eth0:2 (10.0.0.11).

CentOS, RHEL, Fedora and similar

In CentOS, rename /etc/sysconfig/network-scripts/ifcfg-enp0s3 as ifcfg-enp0s3:1 and make a copy as ifcfg-enp0s3:2, and then just change the following lines, respectively:

DEVICE="enp0s3:1"
IPADDR=10.0.0.10

and

DEVICE="enp0s3:2"
IPADDR=10.0.0.11

Once done, restart the network service:

systemctl restart networking