Troubleshooting related tutorial/FAQ

How to check hard drive health on FreeBSD

last updated May 20, 2019 in FreeBSD, Hardware, Troubleshooting, UNIX

How do I read my hard disk/SSD health using smartctl command on FreeBSD operating system? How can I hard drive health on FreeBSD and find out if my disk is dying?

Perl: warning: Setting locale failed in Debian and Ubuntu

last updated March 4, 2019 in Debian / Ubuntu, Linux, Troubleshooting

I am trying to install package and doing some other work. But, getting the error that read as “perl: warning: Setting locale failed. perl: warning: Please check that your locale settings:” How do I fix this problem on my Debian Linux server?

FreeBSD wget cannot verify certificate, issued by Let’s Encrypt

last updated December 17, 2018 in FreeBSD, FreeBSD Jails (VPS), Troubleshooting, UNIX

I installed GNU wget utility on FreeBSD as explained here. However, whenever I use the wget command to download stuff from the Internet, it says:
ERROR: cannot verify download.freebsd.org’s certificate, issued by ‘CN=Let\’s Encrypt Authority X3,O=Let\’s Encrypt,C=US’:
Unable to locally verify the issuer’s authority.
How do I fix this problem on FreeBSD 12?

pfSense email notification when fallback WAN connection goes down

last updated December 23, 2018 in FreeBSD, Monitoring, Troubleshooting, UNIX

I have two WAN connection. The first WAN connection connects via FTTH modem. The second connection connects via 4G LTE CPE modem. I have configured fallback and load balanced dual WAN connection on my pfSense box. However, once in while the Internet connection either one of the WAN goes down. How can I tell pfSense to send an email notification when fallback (or any) WAN connection goes down? How to configure pfSense email notification when an alert happens?

Slow performance issues of OpenBSD or FreeBSD KVM guest on Linux

last updated July 22, 2018 in CentOS, Linux KVM, RedHat and Friends, Troubleshooting

I run a couple of OpenBSD and FreeBSD guest/virtual machines under KVM. My server has 32GB ram and 4C/8T Intel Xeon CPU. Everything was working fine until recent CentOS Linux 7 kernel update. After a fresh reboot of my CentOS 7 Linux box OpenBSD and FreeBSD machine become very slow and after 24 hours stop responding to the network request. How can I solve significant performance problems with BSD family of oses running on CentOS 7 KVM?

How to redirect Nginx non-www to www domain over SSL

last updated April 24, 2018 in Linux, Nginx, Troubleshooting, UNIX

I am getting an error that reads, “Your connection is not secure” when trying to redirect https://theos.in/ to https://www.theos.in/ domain using HTTP 301. How do I redirect Nginx non-www to www domain over SSL?

How to reset forgotten root password for Linux KVM qcow2 image/vm

last updated February 10, 2018 in Debian / Ubuntu, Linux, Linux KVM, Troubleshooting

I have Debian Linux VM running on KVM. I think I forgotten the password for the root account and I am no longer able to run ‘su -‘ command. How do I reset the password for the root account for KVM VM which is in qcow2 format?
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