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Author: Nikko

I am currently a DevOps Engineer and run the blog (swissarmydevops.com).
Run a Website Speed Test from Linux Command Line

Run a Website Speed Test from Linux Command Line

Posted on November 26, 2017December 23, 2018 by Nikko
Setup an alias for the speed test by running the following command: alias speedtest="curl -s -w 'Testing Website Response Time for :%{url_effective}\n\nLookup Time:\t\t%{time_namelookup}\nConnect Time... Read More
Troubleshooting: X11 Forwarding Issues

Troubleshooting: X11 Forwarding Issues

Posted on November 18, 2017December 23, 2018 by Nikko
Verify you have the software running and configured correctly Verify that you have “xming” or “VcXsrc” actively running on your desktop. If not, download and install it. Open Putty and cr... Read More
Troubleshooting: Low Disk Space

Troubleshooting: Low Disk Space

Posted on November 18, 2017December 23, 2018 by Nikko
Move to the top level directory cd / Find the directory that is using the most space du -sh ./* Change into the directory with the most space cd / Continue following this pattern until you find a file... Read More
Troubleshooting: /boot Disk Space Full

Troubleshooting: /boot Disk Space Full

Posted on November 18, 2017December 23, 2018 by Nikko
Centos – Remove old Kernels Check to see if there are old kernels that can be uninstalled rpm -q kernel Install the software that removes the old kernels yum install yum-utils Clean up the old k... Read More
Troubleshooting: Cannot Connect Using DNS

Troubleshooting: Cannot Connect Using DNS

Posted on November 18, 2017December 23, 2018 by Nikko
Add Google’s Name Servers to the bottom of the resolv.conf file and try again vim /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 If this did not resolve the issue then move Google’s public... Read More
Troubleshooting: Error - No Route To Host

Troubleshooting: Error – No Route To Host

Posted on November 18, 2017December 23, 2018 by Nikko
*** This error generally indicates that it cannot find the proper path to take to get to the destination server Verify that you are able to connect to other servers using IPs and DNS ping 8.8.8.8 ping... Read More
Troubleshooting: Server Experiencing Network Connectivity Issues

Troubleshooting: Server Experiencing Network Connectivity Issues

Posted on November 18, 2017December 23, 2018 by Nikko
Check if the port is open and accessible from source server Attempt to telnet to the port that your application uses from the source server. telnet [DEST-IP] [PORT] Or curl -v telnet://[DEST-IP]:[PORT... Read More
Troubleshooting: Yum Failing to Update

Troubleshooting: Yum Failing to Update

Posted on November 18, 2017December 23, 2018 by Nikko
Solution   Determine which repository is failing. The error output from ‘yum update’ should tell you this information Disable that repository vim /etc/yum.repos.d/$BROKENREPO Change ... Read More
Troubleshooting: Forgot Root Password - How to Reset

Troubleshooting: Forgot Root Password – How to Reset

Posted on November 18, 2017December 23, 2018 by Nikko
Boot into Single User mode Connect via console to the server Reboot the server When the Grub menu comes up press “e” on the OS you’re using Look near the bottom of the list o... Read More
Troubleshooting: HAProxy Won't Start

Troubleshooting: HAProxy Won’t Start

Posted on November 18, 2017December 23, 2018 by Nikko
Verify there are not any syntax errors in the HAProxy config file with this command haproxy -c -V -f /etc/haproxy/haproxy.cfg Verify HAProxy is not trying to use any ports that are already in use grep... Read More
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