Hosting Server Related

CHANGE TIME ZONE
1.
Edit php.ini file (/Applications/XAMPP/xamppfiles/etc/php.ini if you use XAMPP in MacOS)
Change:
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date.timezone=Europe/Berlin
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to:
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date.timezone=America/Chicago
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    2. Restart server
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SETTING UP HTTPS (SECURED HTTP) FOR OE (RECOMMENDED)
This is optional but recommend for any site that requires user login
This specifically apply to: 
CentOS 7 
1.
Follow the instruction in this website to install and enable ssl: http://wiki.centos.org/HowTos/Https#head-35299da4f7078eeba5f5f62b0222acc8c5f2db5f​
Ignore Step 3 in the tutorial above
    2. Create /etc/httpd/conf.d/oe.conf (same name as the folder contain Open Enventory, in this case /var/www/html/oe)
In Terminal, type:
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sudo vi /etc/httpd/conf.d/oe.conf
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Add the content below:
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NameVirtualHost *:80
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<VirtualHost *:80>
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    ServerName your_url.net
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    DocumentRoot /var/www/html/oe
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    Redirect permanent / https://your_url.net
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</VirtualHost>
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NameVirtualHost *:443
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<VirtualHost *:443>
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    SSLEngine on
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    SSLCertificateFile /etc/pki/tls/certs/ca.crt
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    SSLCertificateKeyFile /etc/pki/tls/private/ca.key
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    <Directory /var/www/html/oe>
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        AllowOverride All
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    </Directory>
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    DocumentRoot /var/www/html/oe
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    ServerName your_url.net
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</VirtualHost>
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All of these below info (highlighted in red can be change to match specific ip address as well as document location:
ServerName your_url.net
DocumentRoot /var/www/html/oe
Redirect permanent / https://romo.ddns.net/
    2. Restart apache service, in Terminal:
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sudo systemctl restart httpd.service
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SETTING UP CRONTAB TO AUTOMATICALLY BACKUP YOUR DATABASE
This is optional but recommend for auto back up the OE database as well as the user’s info and password
This specifically apply to: CentOS 7 (Apache version: Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips PHP/5.5.25
PHP version: 5.5.25
MySQL server version: 5.5.41-MariaDB)
1.
Set up sshpass to automatically pass the password. Note: this is not ultrasafe but it is simple. Check out this link: http://www.server-world.info/en/note?os=CentOS_7&p=ssh&f=7 
(only need to follow how to install, step 1)
2.
Go into Terminal in your server and log in as root user (type: “su” and then password at the command line
Note: you can do the rest of the command lines below with prefix “sudo your-command-here” if you don’t want to log in as root
    3. At the command line, type:
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crontab –e
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    4. When the file is open, insert the following. Note: everything is red can be changed to match specific details. -$(date +\%Y\%m\%d): is used to set automatic date
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#This is to back up the Romo's OE database into home/khoi/OEbackup, every day at 00:05 am
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5 0 * * * mysqldump -u root –pyour-password romo > /home/khoi/OEbackup/romo-backup-`date +"%Y%m%d"`.sql
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#This is to back up the user table in mysql in order to save users' password, every day at 00:10 am
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10 0 * * * mysqldump -u root -pyour-password mysql user > /home/khoi/OEbackup/romo-backup-user`date +"%Y%m%d"`.sql
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#This is to copy the back up file to External harddrive, every day at 00:15 am
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15 0 * * * sshpass -p your-password rsync -ave ssh --ignore-existing /home/khoi/OEbackup/ [email protected]:/Users/daniel/Documents/OEbackup/
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#This is to delete the file every month
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0 0 * * */4 rm -r /home/khoi/OEbackup/romo-backup-*.sql
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    5. More example of crontab can be read here:
Linux Crontab: 15 Awesome Cron Job Examples
The Geek Stuff
Crontab in Linux with 20 Useful Examples to Schedule Jobs
TecAdmin
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OPTIMIZING CENTOS 7 PERFORMANCE
Apache2 and php fpm performance optimization — Step-by-step guide
Medium
How to optimize Apache performance on CentOS 7
VPSCheap.NET Blog
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 IP BLOCKING FOR SECURITY ENHANCEMENT ON CENTOS 7 SERVER
This guide to use access_log to find out some high frequent access ip and then check them manually and form a block ip if necessary
Find IP address with the most access
1.
Follow this: https://stackoverflow.com/questions/18682308/sort-uniq-ip-address-in-from-apache-log , first answer
2.
Specifically, ssh into the server and then log in as root user
3.
Use following command:
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cat /var/log/httpd/access_log | awk '{print $1}' | sort -n | uniq -c | sort -nr | head -20
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change “-20” to “-xx” with “xx” is the number of result. This is sort from most to least access request
    4. Google any ip lookup website and check these IPs(e.g: https://whatismyipaddress.com/ip-lookup). If find any suspicious ones, you can add a rule to block those ip network address by the next step
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Setting up rule to block ip network.
Follow this guide: https://www.getpagespeed.com/server-setup/security/centos-7-ban-bad-ips-and-networks-with-firewalld​
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Finding info about the network list
1.
Follow this guide: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/security_guide/sec-setting_and_controlling_ip_sets_using_firewalld​
2.
Specifically using this command (after ssh into the server and then log in as root)
To list the IP sets known to firewalld in the permanent environment, use the following command as root:
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firewall-cmd --permanent --get-ipsets
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    3. To get more information about the IP set, use the following command as root: (in the example below, “test” is the name of ipsets you got from the above command
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firewall-cmd --permanent --info-ipset=test
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Or:
To see the extended entries list of the IP set, use the following command as root:
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firewall-cmd --permanent --ipset=test --get-entries
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To block IP from a whole country
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Follow this guide: 
[TOP TIP] firewalld and ipset (country blacklist) | Linode Questions
Linode Cloud Hosting
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FREEING DISK SPACE IN CENTOS 7
See these references:
Freeing disk space on your Linux server
How do I clear space on my main system drive on a Linux CentOS system?
Stack Overflow
How to free up space on centos server
Stack Overflow
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ADVANCE FILE AND FOLDER PERMISSION/OWNERSHIP SETTING IN CENTOS 7
See the following resources:
Good and comprehensive: http://www.vanemery.com/Linux/ACL/linux-acl.html#default​
Simple preservation of parent folder group owernship for all files newly created: https://serverfault.com/a/361666​
​https://unix.stackexchange.com/questions/115631/getting-new-files-to-inherit-group-permissions-on-linux​
​https://askubuntu.com/questions/642236/how-to-make-the-newly-created-files-inherit-the-directorys-permissions​