Compile and Install Python 3.8

Install Python 3.8 refer to:

How to Build Python From Source Code

wget https://www.python.org/ftp/python/3.8.4/Python-3.8.4.tgz

# For apt-based systems (like Debian, Ubuntu, and Mint)
$ sudo apt-get install -y make build-essential libssl-dev zlib1g-dev \
       libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \
       libncurses5-dev libncursesw5-dev xz-utils tk-dev

# For yum-based systems (like CentOS)
$ sudo yum -y groupinstall "Development Tools"
$ sudo yum -y install gcc openssl-devel bzip2-devel libffi-devel

$ tar xvf Python-3.8.4.tgz
$ cd Python-3.8.4

$ ./configure --enable-optimizations --with-ensurepip=install

$ make -j 8

$ sudo make altinstall

$ python3.8 --version
Python 3.8.4

# To run the test suite, type the following command:
$ python3.8 -m test

Lustre Administration

About Storage Controller or RAID Controller (refer to below [5] of its page 11)

"Note that in the case where there is no cache-mirroring link between the controllers, the cache on the controllers must be disabled entirely to ensure that the file system does not become corrupted in the event of a controller failure."

Reference:

1. Getting Started With Lustre 
2. Official Manual 
3. Lustre 101 and Lustre Administration Essentials 
4. A Performance Study of Lustre File SystemChecker: Bottlenecks and Potentials
5. Intel - Architecting a High Performance
6. TOREAD Inside The Lustre File System 
7. TOREAD A Performance Study of Lustre File SystemChecker: Bottlenecks and Potentials 
   Storage System
   

Lustre with LDISKFS vs ZFS:

• At-a-Glance Comparison of Lustre with LDISKFS vs ZFS 
• Benefits of ZFS* for Lustre* Deployments   
  

Install/Remove X Desktop System

Refer to 

• Installing / Removing GUI on Centos 7, RedHat 7 (RHEL) Minimal Install and Enable Remote Desktop 
  

How to install miniconda and using environment

Refer to:

•  Using QGIS from Conda 
• Install Miniconda or Anaconda 
  

For example,

conda create --name qgis_stable

To use an environment, you need to activate it.

conda activate qgis_stable

Your terminal prompt will show you the active environment.

(qgis_stable) aneto@oryx:~/miniconda3$

To deactivate the current environment, you run

conda deactivate

Issue: alternative glibc version causes problem (version GLIBC_PRIVATE not defined in file ld-linux-x86-64.so.2)

Problem describe and analysis:

Refer to:

• version GLIBC_PRIVATE not defined in file ld-linux-x86-64.so.2 
• Multiple glibc libraries on a single host 
  

Issue: su user core dumped PAM unable to dlopen

Issue: su user core dumped PAM unable to dlopen (/lib64/security/pam_fprintd.so)

Solution:

 authconfig --disablefingerprint --update 

Ubuntu issues

• How To Fix Sub-Process /Usr/Bin/Dpkg Returned An Error Code (1) In Ubuntu   (check method 5)
  

Using Fail2ban To Secure SSHD Service

Refer to 

• How To Protect SSH With Fail2Ban on CentOS 7 
• Linode: Using Fail2ban to Secure Your Server - A Tutorial 
• How to Secure Your Linux Server with fail2ban 
  

If you set a longer ban duration (like several hours), but want to allow an IP address to make another connection request sooner, you can parole it early.

We type the following to do this:

sudo fail2ban-client set sshd unbanip 192.168.5.25

LVM Can't read superblock

Refer to Can't read superblock : mounting error /dev/sda6