Tag Archives: ubuntu

How to force users to use secure passwords on Ubuntu/Debian Linux

How to force users to use secure passwords on Ubuntu/Debian Linux
My Linux shell user can modify their password using the passwd command. How can I force users to choose the secure password that will prevent users from using stupid passwords like “abc123”, “password”, “123456” and so on? How do I setup password quality requirements on my Debian or Ubuntu Linux server?
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How to install KVM on Ubuntu 16.04 LTS Headless Server

How to install KVM on Ubuntu 16.04 LTS Headless Server

Kernel-based Virtual Machine (KVM) is a virtualization module for the Linux kernel that turns it into a hypervisor. How can I install KVM with bridged networking, setup guest operating system as the back-end virtualization technology for non-graphic Ubuntu Linux 16.04 LTS server?
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How to configure Postfix relayhost (smarthost) to send eMail using an external smptd

How to configure Postfix relayhost (smarthost) to send eMail using an external smptd

How do I configure Postfix MTA to send eMail using an external cloud-based SMTP server (with username: password) from a web server on Linux or Unix-like system? How do I configure an Ubuntu server and postfix as the relay server (smarthost)?
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cron Error: bad username; while reading /etc/cron.d file on Linux

cron Error: bad username; while reading /etc/cron.d file on Linux

I am getting the following error in my cron job log file /var/log/cron.log:
       Aug 22 01:59:01 server2 cron[7510]: Error: bad username; while reading /etc/cron.d/backups I have job entry as follows to run a job at 00:50 every day for root user:
       50 0 * * * /etc/cron.d/backups How do I fix this problem on Linux or Unix-like system?
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Accessing Internet from cloud VM when you have only private network enabled

Accessing Internet from cloud VM when you have only private network enabled
We have a couple of virtual servers hosted with Softlayer for processing data and backup purpose. The public interface is completely turned off i.e. no Internet access. We can only access VMs using a VPN. It resulted in decreased costs and many security problems for backend servers. However, when you order “Private Network Only” cloud VM, you cannot route outgoing traffic to the Internet using your VM.

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How to make make disk image with dd on Linux or Unix

How to make make disk image with dd on Linux or Unix

How do I create disk image using dd command? How do I perform disk cloning from a live Linux cd for backup or recovery purpose?
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How to configure a static IP address on CentOS 7 / RHEL 7

How to configure a static IP address on CentOS 7 / RHEL 7

I am a new sysadmin and CentOS user. My system is configured to use DHCP. How can I switch from DHCP to static IP address configuration in a CentOS 7 desktop system? How do I setup a static TCP/IP address on my CentOS Linux 7 or Red Hat Enterprise Linux 7 server using command line option?
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