• sudo: unable to resolve host


    sudo: unable to resolve host yourhostname No clue why sudo is doing that when running. Solution Check /etc/hosts You will probably find that it doesn't contain "yourhostname" for 127.0.0.1 Just update the hostname or add a field for your hostname like this: 127.0.0.1 yourhostname ........
  • Linux How To Clone One System Harddrive to another remote system


    The easiest way is to use SSHand DD or a combination of netcat. SSHwill be a little slower due to encryption but is the most secure way (on two older systems the average clone speed is about 40-50MB/s). This is also OS independent as it doesn't matter what the source OS is because you are literallly cloning the drive so you retain the partition table and settings. Clone HDD using SSH and DD........
  • Centos 7 How To Change Hostname


    Some guides still use the old Centos 6 style (do not use /etc/sysconfig/network). In Centos 7 the file is /etc/hostname echo "HOSTNAME=yourhostname.com" > /etc/hostname........
  • CPanel Log File Locations for access_log,error_log, mysql


    All Errors (CPanel does not report by domain, but puts everything in a single log which Ithink is a bit silly and annoying): /usr/local/apache/logs/error_log Access_Logs They are found within the home directory of the site user eg.: /home/admin/access-logs/yoursite.com MySQL Logs /var/lib/mysql/yourhostname.err........
  • Directadmin Solution "This is e-mail notification to warn you that your hostname is setup improperly on your system."


    This is e-mail notification to warn you that your hostname is setup improperly on your system. This is an annoying message and bug with Directadmin, my hostname is set correctly, why does it complain? To get of this message just run this command: /usr/local/directadmin/scripts/hostname.sh yourhostname.com........
  • Apache High CPU Usage Enable Mod_Status Guide Solution - Find Cause of High CPU Usage Script/Domain


    mod_status is a great way to track down the source of high CPU usage and to find what vhost/script is the cause of it. It gives you a live view of bandwith usage, CPU usage, and memory usage broken down by domain/vhost and script/URI. Enable mod_status vi /etc/httpd/conf/httpd.conf ExtendedStatus On SetHandler server-status Order Deny,Allow Deny from all All........
  • Enable SPAMASSASSIN on Postfix in 5 minutes


    Centos 5 Postfix and SPAMASSASSIN Tutorial yum install spamassassin chkconfig spamassassin on vi /etc/mail/spamassassin/local.cf ############## #required_hits 5 #report_safe 0 #rewrite_header Subject [SPAM] #5 is the least restrictive (means only the most obvious SPAM is caught. 0 is obviously the most restrictive/sensitive and would have lots of false positives require........
  • Postfix/Any Email Server check for Open Relay


    The first thing you need to remember is not to check from the same host/server itself. This is a silly mistake I made, the reason is that many mailservers and especially postfix are configured to allow relaying from the localhost/same host. If you do that you'll get a false positive. *Make sure you test from another host/system than the mail server itself! telnet yourmailserverhost.com 25 220 Courier (FreeBS........
  • Understanding /etc/aliases from sendmail when using with postfix or other MTA's


    understanding /etc/aliases *remember to apply changes you need to run "newaliases" after editing /etc/aliases one thing I don't get is that it doesn't allow you to specify the whole e-mail address on the left-hand side eg: yourfullemail@domain.com: someotheremail@domain.com postalias: warning: /etc/aliases, line 109: name must be local (if you try the above) It works more like this: your........
  • Latest Articles

  • Debian and Netplan
  • CentOS 8 how to restart the network!
  • CentOS 8 how to convert to a bootable mdadm RAID software array
  • ADATA USB Thumb Drive Issues
  • KMODE EXCEPTION NOT HANDLED - QEMU/KVM Won't Boot Windows 2016 or 10 Image or Physical Machine
  • Linux Mint / Ubuntu / Debian Mate Disable Guest Session and Hide Usernames on Lightdm Login screen GUI
  • SSH How To Create Public/Private Key Pair and with a Larger Keysize than 2048 bits
  • selenium.common.exceptions.WebDriverException: Message: Can not connect to the Service geckodriver
  • python ModuleNotFoundError: No module named 'bs4' even though you have the module
  • ssh how to connect using a SOCKS 5 proxy with nc and proxycommand
  • Enable AMDGPU Linux Driver
  • apache symlinks denied even with followsymlinks
  • chown how to change ownership on a symlink
  • how to use ifplugd in Linux to execute a command or script when a NIC cable is unplugged or plugged in
  • dd how to backup and restore disk images including compression with gzip
  • mpv / mplayer with Radeon / AMD GPU Video Card Driver enable VDPAU GPU Accelerated Video Decoding
  • Wordpress Reset Blog User Password from MySQL Using Linux Bash and not PHPMyadmin
  • Ubuntu Linux Mint Debian xorg performance and tear-free tuning for AMD Radeon Based Cards
  • Centos 7 Stopped and Disabled Firewalld and ports still blocked
  • MariaDB / MySQL Reset Root Forgotten Password on Centos 7