To find out where disk space is being used: Get to the root of your machine by running # cd / Run # sudo du -h –max-depth=1 Note which directories are using a lot of disk space. cd into one of the big directories. Run # ls -l to see which files are using a […]
Category: Administration
Change Windows RDP SSL Cert from Default to Comodo Free SSL
This article describes how to change the SSL cert for you Windows server to match a hostname so that when you remote desktop to a windows server, you don’t get a warning for the identity and the SSL cert. Go to Sectigo (Comodo) and sign up for a free ssl. https://ssl.comodo.com/free-ssl-certificate.php First, generate a CSR. […]
Network Throughput Testing with iPerf
iPerf is a command-line tool used in diagnosing network speed issues by measuring the maximum network throughput a server can handle. It is particularly useful when experiencing network speed issues, as you can use iPerf to determine which server is unable to reach maximum throughput. Basic usage: run iperf -s on machine A then go […]
Accessing Website with IP NAT Hairpinning
The term hairpinning comes from the fact that the traffic comes from one source into a router or similar devices, makes a U-turn and goes back the same way it came. Visualize this and you see something that looks like a hairpin. Hairpin NAT is a useful technique for accessing an internal server using a […]
How to Set or Change Hostname in CentOS 7
Use this information when changing the hostname in centos 7. Ways to show the hostname # hostname # hostname -s # hostname -f # cat /etc/hostname # hostnamectl How to change the hostname. In order to change or set a CentOS 7 machine hostname, use the hostnamectl command as shown in the below command excerpt. […]
Setting up cron to remove emails from an utility email
Sometimes you need to add an email to receive alerts and other emails for you system or business. WThen after a while the email account is full of emails. One method to automate this is to set up a cron in cpanel to remove the emails. Here is an example. bin/find /home/cpaneluser/mail/domain.name/emailuser/new -type f -exec […]
Smartmon tools Windows
Some Smartmon tools https://github.com/v-zhuravlev/zbx-smartctl https://share.zabbix.com/storage-devices/smart-monitoring-with-smartmontools-lld https://www.smartmontools.org/wiki/Download#InstalltheWindowspackage
Install Lets encrypt on WHM and cPanel
Follow this: https://documentation.cpanel.net/display/CKB/The+Let%27s+Encrypt+Plugin The this for the icon in cpanel: https://premium.wpmudev.org/blog/free-ssl-https-cpanel/ Log into your SSH client at root level, then add the Let’s Encrypt repository with the following command: cd /etc/yum.repos.d/ && wget https://letsencrypt-for-cpanel.com/static/letsencrypt.repo Next, install the plugin for cPanel with line below and yum: yum -y install letsencrypt-cpanel Output: yum -y install letsencrypt-cpanel Loaded […]
Check Apache Connections
How many apache connections are there? Ubuntu # ps faux | grep ‘/usr/sbin/apache2’ | wc -l CentOS # ps faux | grep ‘/usr/sbin/httpd’ | wc -l
Check IP Amounts in Access logs
When checking a server access logs, you may wnat to see how many time an IP is requesting pages. Here is the command: grep 123.123.123.123 /usr/local/apache/logs/error_log | wc -l 1018