Update some of tools

Author: chrisguest75

27_checking_resources/README.md

@@ -1,17 +1,58 @@
 # Checking Resources 
+Demonstrate how to use various commands to verify resource usage in the OS.
+
 
 TODO:
-Open sockets
-Free memory 
-File handles
-Look at the brenden greigg resources
+* Open sockets
+* Free memory 
+* File handles
+* Look at the brenden gregg resources http://www.brendangregg.com/linuxperf.html
+* Filesystem
+* Procfs
+* debugfs
+https://github.com/raboof/nethogs
+
+## Disk
+
+```sh
+# free space
+df -h
+```
 
 ## Sockets
 
 ```sh
 # listening sockets
 ss -l 
 ```
+## Memory
 
+```sh
 free -h
 
+vmstat 
+```
+
+## IO
+
+[sysstat](https://www.linux.com/training-tutorials/sysstat-howto-deployment-and-configuration-guide-linux-servers/)  
+
+```sh
+
+sudo apt install sysstat   
+
+# cpu usage
+mpstat -A
+
+
+
+```
+
+
+
+top
+systemd-cgtop   
+systemd-analyze blame 
+
+systemctl list-units -t service        
+

README.md

@@ -123,6 +123,10 @@ Steps [README.md](./24_finding_files/README.md)
 Demonstrate how to setup a cronjob
 Steps [README.md](./26_cron/README.md) 
 
+## Example 27 - Checking Resources
+Demonstrate how to use various commands to verify resource usage in the OS.
+Steps [README.md](./27_checking_resources/README.md) 
+
 ## TODO:
   * Globbing 
   * Process Substition versus command substitution < <() < $()