A Technical I.T./DevOps Blog
Update 11/22/17
Problem scenario
You want to use CloudWatch. What steps do you need to take initially to have it work on a Linux server?
Solution
Prerequisites
Prerequisite #1 The server must be an EC-2 instance (not a non-AWS server) with AWS CLI installed (but not necessarily configured). For directions on installing AWS CLI, see this link.
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Continue reading “How Do You Set up (Install and Configure) AWS CloudWatch?”
Problem scenario: You imported an .ova file. But when you start the new VM (from the imported .ova file) you get this error:
“VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.”
What do you do?
Root cause: VT-x has not been enabled.
Solution
Enable VT-x.
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Problem Scenario: You use Lynx to browse the web. You want to see the complete URL when using Lynx (e.g.,for posterity) of a given web page. What do you do?
Solution
1. Use Lynx and browse to a given web page. Browse as normal and stop when you are on the page for which you want to find the URL.
2.
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Continue reading “When Using Lynx, How Can You See the Underlying URL?”
Problem scenario: Using Oracle VirtualBox on a 64 bit version of Windows, you go to create a new virtual machine as a guest server. You want it to run a 64 bit version of Linux. You start to build the new machine using Oracle VirtualBox. You choose the “Version” and only see 32 bit options. You have a processor (hardware) that is 64 bit. The Windows OS is 64 bit.
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Problem scenario: The Internet seems sluggish and unreliable when using Firefox on Windows 7. You Internet speed is medium slow, and your laptop has decent hardware specifications by 2017 standards. What can you do?
Solution: Use Chrome. You can download it here.
Our research and investigation has confirmed that Chrome will be faster. There are other reasons besides speed for choosing different web browsers.
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Continue reading “How Can Web Browsing Be Sped up (or Quickened) When Using Windows 7?”
Problem scenario: In Linux, you want to view log activity captured recently. Looking through all the logs in /var/log can take a great deal of time. How do you correlate a recent event by finding log files that were modified in the past 10 minutes?
Solution
Run this command:
find /var/log -mmin -10
This command will find files in /var/log and its subdirectories.
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Continue reading “How Do You Find a Linux Log That Was Modified in the past 10 Minutes?”
Problem scenario: You know the Linux username that you want to use. But you do not know its corresponding UID or GID. How do you find the UID when you only know the username?
Solution
Use the id command. For example:
id jdoe
The results will give you the UID and GID.
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Continue reading “How Do You Find the User ID In Linux/Unix When You Only Have the Username?”
Problem scenario
You have C++ and Postgres installed on a Linux CentOS server. How do you write C++ programs to retrieve data from Posgres databases?
Solution
Install the official C++ API for Postgresql. These directions should work on any RedHat distribution of Linux (e.g., CentOS or Fedora).
Run the following from the Linux command prompt:
[Sassy_Social_Share]Problem Scenario: You downloaded an .ova file. You want to create a virtual server (a clone) with this pre-configured OS. How do you use Oracle VirtualBox to use this .ova file?
Solution
1. Open Oracle VirtualBox
2. Go to File -Import Appliance (or press Ctrl-i)
3. Select the OVA file
4. Click “Next”
5. Now you are ready to start the VM.
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Continue reading “How Do You Use an .Ova File with Oracle VirtualBox?”
Problem scenario
You want to install Nginx on a CentOS/RHEL/Fedora Linux server. What do you do?
Solution
1. Create a file here: /etc/yum.repos.d/nginx.repo
2. It should have these five non-blank lines:
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/mainline/centos/7/$basearch/
gpgcheck=0
enabled=1
3. Run these commands:
sudo yum -y update
sudo yum -y install nginx
sudo systemctl start nginx
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Continue reading “How Do You Install Nginx on a CentOS/RHEL/Fedora Server?”