Greetings, BCC is now available for Ubuntu and in this article we will be showing you its extended command line use to trace Linux systems for performance monitoring. The BPF Compiler Collection (BCC) is a toolkit for building kernel tracing [...]
TROUBLESHOOTING
5 User Space Debugging Tools in Linux
By definition, debugging tools are those programs which allow us to monitor ,control and correct errors in other programs while they execute. Why should we use debugging tools? To answer this, there are various situations where we get stuck while [...]
How to Fix a Broken Initrd Image in Linux
Today, we'll show you how you can fix your broken or accidentally deleted Initrd Image ie. Linux Kernel Image and GRUB Loader in your Ubuntu installed machine. It should also work for Ubuntu derivatives as well as other distribution. Initrd is a [...]
Fix Grub Filesystem Type Unknown Error On Centos / Redhat
LINUX TROUBLESHOOTING GRUB is GRand Unified Bootloader, the default bootloader for Linux kernel based Operating Systems. If you have a dual boot system, like Windows and Linux, then you may have some issues with GRUB. If you install Windows after [...]
Fix Error - Locale: Cannot Set LC_ALL to default locale: No such file or directory
Question How to fix the error “locale: Cannot Set LC_ALL to default locale: No such file or directory”. Answer Locales are used in Linux to define which language the user uses. As the locales define the character sets being used [...]
Solution Linux Useradd Error - cannot lock /etc/passwd; try again later
Sometime in Linux when adding user using the useradd command it throws below error. #useradd test useradd: cannot lock /etc/passwd; try again later Answer The system files that are related to Linux user management are, /etc/passwd : Contains user account [...]
How To Record / Log Failed Login Attempt In Linux
A system administrator needs to monitor any unusual activities on the system. An unauthorized user may try to access the system by trying out different passwords. A feature in Linux that can be used to monitor these failed login attempts is [...]
Linux Tcp Ports - How To Use Netstat and Iptables For Linux Troubleshooting
It is a well known fact that Linux/Unix systems are mostly used as servers and are often in connection to the internet. In such platforms, access is limited by ports used. The term 'port' means a number access point that [...]
How To Fix if Partition Table Entries not in Disk Order
The suggestion given below can help if your partition table is not in a proper disk order. From linux fdisk (fdsik /dev/), choose the advanced menu (by pressing x, afaik), then choose the entry for correcting partition ordering (press 'm' anytime [...]
How Linux Who & Last Command Helps for Root Cause Analysis
The last command is very important in linux as it helps in doing root cause analysis of the linux system. Assume that something is changed in the linux system, in this situation you are not sure who has made the changes. Using the 'last' [...]
3 Commands To Unmount when NFS Mounted Directory is Busy
When you do an NFS mount, it can happen that, for some reasons, we are not able to unmount the disk/partition. When it happens, if we care to lost data, we need to use a safety method to resolve the [...]