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How to change ulimit parameter per specific user and process
How to change ulimit parameter per specific user and process Some times servers get overloaded because there is not limitation for user or application. We can use ulimit to some…
Analyzing Server Performance
Analyzing Linux Server Performance If there is an issue with server performance, you need to follow fundamental steps to approach the problem. Here are few fundamental steps: 1. CPU bottlenecks…
Basic Linux troubleshooting tips
Troubleshooting tips. When there is a an issue/problem, there are many ways to troubleshoot. Some of the experienced administrator would tell the problem and solution right away, but it is…
Linux Binary Kernel vs Source Kernel
I believe that most of you might have questions to choose binary kernel or source kernel. Installing binary kernel is straight forward and you can easily upgrade. When you compile…
How to get ssh server fingerprint information
If you want to find out fingerprint for SSH server, please use the following command. [mark@saturn .ssh]$ ssh-keygen -lf id_rsa.pub (your public key) 2048 87:85:2c:dd:df:8b:d7:1c:5c:d1:0d:70:52:e8:69:c7 id_rsa.pub
Linux ACL getfacl and setfacl examples
Create and manage Access Control Lists (ACLs) ACL is really useful when you are trying to give permission for specific userIDs. First you need to remount the file system with…
SElinux setup and troubleshooting
Introduction Security-Enhanced Linux (SELinux) is a mandatory access control (MAC) security mechanism implemented in the kernel. SELinux was first introduced in CentOS 4 and significantly enhanced in CentOS 5. 1.1….
how to check status of account
how to check status of linux account? You can use any of the following methods to find out the status of accounts passwd -S <username> chage -l username Minimum: …