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--- linux:ubuntu [2023/11/02 08:18] – [Essencial Commands] skipidar
+++ linux:ubuntu [2024/05/15 05:10] (current) – [Performance Monitoring commands] skipidar
@@ Line 62: / Line 62: @@
 & # When placed at the end of a command, execute that command in the background. "vim &"
 fg # bring theprocess back to the foreground. jobs; fg %1
+# enable the NTP server for time syncronization
+sudo timedatectl set-ntp on
+timedatectl
 # clear /var/log/journal/ files, leave only data of last 10d
 sudo journalctl --vacuum-time=10d
@@ Line 183: / Line 187: @@
 </VirtualHost>
 </code>
+==== Performance Monitoring commands ====
+{{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/c12ezuvdZY.png}}
+how to diagnose a mysterious process that’s taking too much CPU, memory, IO, etc?
+The diagram below illustrates helpful tools in a Linux system.
+<sxh shell>
+vmstat # reports information about processes, memory, paging, block IO, traps, and CPU activity.
+iostat # reports CPU and input/output statistics of the system.
+netstat # displays statistical data related to IP, TCP, UDP, and ICMP protocols.
+lsof # lists open files of the current system.
+pidstat # monitors the utilization of system resources by all or specified processes, including CPU, memory, device IO, task switching, threads, etc.
+</sxh>
+Credit: Diagram by Brendan Gregg
@@ Line 1453: / Line 1478: @@
    dig -t NS google.com @1.1.1.1 ANY
+===== Upgrading packages =====
+==== Python3 ====
+<sxh shell>
+# install new version of python
+sudo add-apt-repository ppa:deadsnakes/ppa
+sudo apt update
+sudo apt install python3.12
+# setting the python12 as default version of python
+sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.12 1
+# gives python3.12.2
+python3 --version
+</sxh>