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Ubuntu Linux

How to install and configure Varnish cache on Ubuntu Linux 16.04 LTS

How do I install Varnish Cache server to improve the performance of my existing Apache web server especially caching dynamic content on Ubuntu Linux 16.04 LTS server?
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How to enable KVM virsh console access for Ubuntu Linux VM

I just followed your tutorial and setup KVM with Ubuntu Linux as a new guest virtual machine. However, I am unable to use the command: ‘virsh console vm’. How do I setup and enable console access in order to gain shell access on the newly created Ubuntu Linux 16.04 LTS VM?
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How to enable proposed archive repo on Ubuntu Linux to install packages

How do I enable the proposed archive for Ubuntu 16.04 LTS use the apt-get to installed selected kernel updated that is not released yet?
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How to open ssh port using ufw on Ubuntu/Debian Linux

How do I allow incoming SSH connections from a specific IP address or subnet on a Ubuntu or Debian Linux server using ufw?
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How to install denyhosts on Ubuntu Linux 16.04 LTS ( intrusion prevention security tool )

I host my blog in cloud server, and I set up ssh to manage my Ubuntu Linux 16.04 LTS server. However, I noticed lots of break in and brute-force attacks on my ssh server? How can I stop hacking attempts into my system?
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How to get list of installed packages on Ubuntu / Debian Linux

I am a new Ubuntu Linux sysadmin. How do I get a list of all installed packages on server1 and install those on server2? How to list all installed packages using apt-get command on Ubuntu or Debian server?
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How to configure ufw to forward port 80/443 to internal server hosted on LAN

I am using UFW to protect my network. How do I forward TCP HTTP port # 80 and 443 to an internal server hosted at 192.168.1.100:80 and 192.168.1.100:443 using UFW on Ubuntu Linux server?
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How to find out why squid proxy exited due to signal 9 with status 0

I am getting an error that read as “The proxy server is refusing connections.” I am using Squid 3 with Ubuntu Linux 16.04 LTS server and how can I find out why my squid proxy server died unexpectedly?
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How to limit SSH (TCP port 22) connections with ufw on Ubuntu Linux

How do I limit ssh connection attempts using UFW (Uncomplicated Firewall) on Ubuntu or Debian Linux server?
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How to install LXD container under KVM or Xen virtual machine

For security and ease of admin, I want to install LXD on my cloud server either powered by XEN or KVM. How do I install LXD on Ubuntu Linux server powered by KVM virtualization technology?
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