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Tag: server management

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Tag: server management

How to Install Redis on Ubuntu 18.04?

Redis is an open-source, in memory-data structure store and it can be used as a database cache and message broker. It’s a distributed in-memory key-value database with optional durability. It provides data structures such as strings, hashes, lists, sets, sorted sets, bitmaps, hyperloglogs, geospatial indexes with radius queries and streams.

This blog helps you to Install Redis on Ubuntu 18.04 version and if you are looking for installing and managing Redis for your application or server, please contact our expert team to get it done. You can also refer our high-performance server management plan to get this done under monthly server management.

Installation of Redis on Ubuntu 18.04

sudo apt update
sudo apt install redis-server

Configure Redis Server on Redis configuration file

cd /etc/redis/
vim redis.conf
####Change the bind ip address with 127.0.0.1
bind 127.0.0.1
####Change the "supervised" option to systemd because we are using ubuntu server and systemd.
supervised systemd

Start and enable Redis server

systemctl restart redis-server
systemctl enable redis-server

Check the status of Redis server, Redis server will listen on 127.0.0.1 on port 6379.

systemctl status redis-server
netstat -plntu

Check Redis by “redis-cli” command

redis-cli ping
redis-cli ping "Hello Redis"

If the “redis-cli ping” command shows output as “PONG” and the “redis-cli ping “Hello Redis” shows output as “Hello Redis” then we can confirm that the Redis server is installed correctly.

Redis needs to be configured and hardened properly to secure the environment and to make it worth for your application.

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August 3, 2020
0

How to Install Netdata on Centos7

Netdata is an open source monitoring system for Linux servers. It provides performance and health monitoring for systems and applications. By using this tool we can monitor CPU usage, Memory, processes, Disks like the overall performance of a Linux server.
This topic covers the steps to install netdata on the centos7 server. Please try our server management plans to get this setup covered for free.

Install dependencies for Netdata

curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash -
yum install epel-release
sudo yum install curl jq nodejs
sudo yum install git zlib-devel libuuid-devel libmnl gcc make git autoconf automake pkgconfig curl findutils libuv-devel

Install Netdata using the official installation script

git clone https://github.com/firehol/netdata.git --depth=1
cd netdata/
./netdata-installer.sh
systemctl start netdata
systemctl enable netdata

Test Netdata using

http://server-ip-address:19999

Netdata Dashboard will be as below

Netdata dashboard
Netdata Dashboard

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July 27, 2020
0

Country Based Redirection In Magento using GeoIP

The GeoIP module is used to find which Geolocation or area is used by the IP from IP location database. We can setup country based redirection rule in htaccess for Magento2 which will redirect the required stores to the specific countries.
To add rules for country based redirection in Magento we have to install the GeoIP module.

The below installation needs to be done on a centos 7 server and if you need this to be done from our end or need help to setup on any other OS, Click here to contact our experts to get it done right now.

Install GeoIP and dependencies

yum install GeoIP GeoIP-devel GeoIP-data zlib-devel

Change the directory to the /usr/share/GeoIP/, upload and extract GeoIP database in this location
You can download the GeoIP database from https://dev.maxmind.com/geoip/geoip2/geolite2/

cd /usr/share/GeoIP/
tar -xzvf GeoLite2-ASN_20200630.tar.gz

Install the required packages for GeoIP

yum install httpd-devel apr-devel ea-apache24-devel.x86_64 ea-apache24-tools.x86_64

 Download and extract GeoIP module using the below steps

wget https://github.com/maxmind/geoip-api-mod_geoip2/archive/1.2.10.tar.gz
tar -xzvf 1.2.10.tar.gz
cd mod_geoip2_1.2.10
sed s/remote_ip/client_ip/g -i mod_geoip.c

Compile and install the GeoIP module

apxs -i -a -L/usr/lib64 -I/usr/include -lGeoIP -c mod_geoip.c

Load the module in Apache at Apache modules conf.

vim /etc/apache2/conf.modules.d/mod_geoip.conf

###########
LoadModule geoip_module /usr/lib64/apache2/modules/mod_geoip.so

<IfModule mod_geoip.c>
GeoIPEnable On
GeoIPScanProxyHeaders On
GeoIPDBFile /usr/share/GeoIP/GeoIPASNum.dat Standard
GeoIPDBFile /usr/share/GeoIP/GeoIPCity.dat Standard
</IfModule>
###########

Check Apache Configuration and restart Apache

httpd -t
service httpd restart

Verify if GeoIP module is enabled by

httpd -M | grep geoip

You can see the result as shown below

Next, we have to add the rule for redirection of countrywide access in Magento2 site. There are certain country codes available for GeoIP database. We can use that country codes here to add rules in .htaccess.

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{ENV:GEOIP_COUNTRY_CODE} ^(GB|RU|IN)$
RewriteCond %{REQUEST_URI} !^/store/
RewriteRule .* https://www.example.com/store/ [L]
</IfModule>

where GB|RU|IN are the country codes for UK, Russia and India

Restart Apache

service httpd restart

According to the above rule, the users accessing from UK and Russia and India for /store of https://www.example.com, will redirect to https://www.skynats.com/store.
By using GeoIP module we can also block and deny countrywide access to the site.

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July 23, 2020
0

Solved – Failed to read session data

PHP is the most used coding language in web-industry. There are lots of issue a developer faces if the process that handles PHP is not configured spotless by server management team. We at skynats are provision in doing the same

Issue – Failed to read session data

The issue is noticed mostly while the session in php not working like login etc. The usual received error is as below

"
PHP Warning:  session_start(): open(/var/lib/php/session/sess_cfiolpjscig0kc1n7j798vplaj, O_RDWR) failed: No such file or directory (2)   session_start(): Failed to read session data: files (path: /var/lib/php/session)
"

Cause – Failed to read session data

There can be more than one cause to this issue here are some

  1. Error is the misconfiguration of PHP process.
  2. Additional conf files for the PHP process.

Resolution – Failed to read session data

To solve this follow the below steps

  1. Check session_handler parameter in the PHP process handler.
  2. Check if the file location is present and has the right permission.
  3. Correct the permission of the file location according to the PHP process handler

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July 14, 2020
0
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