Merge pull request kodekloudhub#5 from rahulsoni43/master

Added links for the readme

README.md

@@ -48,3 +48,39 @@ These are notes from the [Linux Basics Course](https://bit.ly/3gGnxm0) hosted on
   - [06-Vi-Editor](docs/05-Working-With-Shell-Part-II/06-Vi-Editor.md)
   - [07-Lab-VI-Editor](docs/05-Working-With-Shell-Part-II/07-Lab-VI-Editor.md)
 
+- [06-Security-and-File-Permissions](docs/06-Security-and-File-Permissions)
+
+  - [01-The-Security-Incident(story)](docs/06-Security-and-File-Permissions/01-The-Security-Incident(story).md)
+  - [02-Linux-Accounts](docs/06-Security-and-File-Permissions/02-Linux-Accounts.md)
+  - [03-User-Management](docs/06-Security-and-File-Permissions/03-User-Management.md)
+  - [04-Access-Control-Files](docs/06-Security-and-File-Permissions/04-Access-Control-Files.md)
+  - [05-File-Permissions](docs/06-Security-and-File-Permissions/05-File-Permissions.md)
+  - [06-SSH-and-SCP](docs/06-Security-and-File-Permissions/06-SSH-and-SCP.md)
+
+- [07-Networking](docs/07-Networking)
+
+  - [01-The-Network-Issue(story)](docs/07-Networking/01-The-Network-Issue(story).md)
+  - [02-DNS](docs/07-Networking/02-DNS.md)
+  - [03-Networking-Basics](docs/07-Networking/03-Networking-Basics.md)
+  - [04-Troubleshooting](docs/07-Networking/04-Troubleshooting.md)
+
+- [08-Storage-in-Linux](docs/08-Storage-in-Linux)
+
+  - [01-Where's-my-Storage](docs/08-Storage-in-Linux/01-Where's-my-Storage.md)
+  - [02-Storage-Basics](docs/08-Storage-in-Linux/02-Storage-Basics.md)
+  - [03-File-System-in-Linux](docs/08-Storage-in-Linux/03-File-System-in-Linux.md)
+  - [04-DAS-NAS-and-SAN](docs/08-Storage-in-Linux/04-DAS-NAS-and-SAN.md)
+  - [05-LVM](docs/08-Storage-in-Linux/05-LVM.md)
+  - [06-Project-Status-Meeting](docs/08-Storage-in-Linux/06-Project-Status-Meeting.md)
+
+- [09-Service-management-with-SYSTEMD](docs/09-Service-management-with-SYSTEMD)
+
+  - [01-Working-Overtime-Story](docs/09-Service-management-with-SYSTEMD/01-Working-Overtime-Story.md)
+  - [02-Creating-a-SYSTEMD-Service](docs/09-Service-management-with-SYSTEMD/02-Creating-a-SYSTEMD-Service.md)
+  - [03-SYSTEMD-Tools](docs/09-Service-management-with-SYSTEMD/03-SYSTEMD-Tools.md)
+
+- [10-The-Client-Demonstration](docs/10-The-Client-Demonstration)
+
+  - [01-Client-Demonstration-in-Jeopardy!(story)](docs/10-The-Client-Demonstration/01-Client-Demonstration-in-Jeopardy!(story).md)
+  - [02-Troubleshoot-the-Development-Environment](docs/10-The-Client-Demonstration/02-Troubleshoot-the-Development-Environment.md)
+  - [03-Finale(story)](docs/10-The-Client-Demonstration/03-Finale(story).md)

docs/06-Security and File Permissions/02-Linux Accounts.md → docs/06-Security-and-File-Permissions/02-Linux-Accounts.md

@@ -4,7 +4,7 @@
   - In this section we will take a look at basic access control in Linux.
   - We will also learn about about the file permissions. Lets Get Started!
 
-    ![linux](../images/linux.PNG)
+    ![linux](../../images/linux.PNG)
 
 
   #### User Accounts
@@ -21,7 +21,7 @@
     [~]$ cat /etc/group
     ```
    
-    ![user](../images/user.PNG)
+    ![user](../../images/user.PNG)
     
   - Each user has a username and a unique ID assigned to them known as user ID or UID.
   - The user also has a GID, the group id they are part of, **`id`** command can be use to check these details. for eg:
@@ -38,7 +38,7 @@
     michael:x:1001:1001::/home/michael:/bin/sh
     ```
    
-    ![group](../images/group.PNG)
+    ![group](../../images/group.PNG)
 
   - To see the list of users currently logged use **`who`** command.
 
@@ -82,14 +82,14 @@
     [sudo] password for michael:
     ``` 
     
-    ![who](../images/who.PNG)
+    ![who](../../images/who.PNG)
 
   - Users listed in /etc/sudoers file can make use of sudo command for privledge escalation.
 
     ```
     [~]$ cat /etc/sudoers
     ```
-    ![sudo](../images/sudo.PNG)
+    ![sudo](../../images/sudo.PNG)
 
   - To restrict anyone from directly login as root login, this can be done by setting **`nologin`** shell.
 

docs/06-Security and File Permissions/03-User Management.md → docs/06-Security-and-File-Permissions/03-User-Management.md

@@ -18,7 +18,7 @@
     bob:x:1002:1002::/home/bob:/bin/sh
     ```
 
-    ![useradd](../images/useradd.PNG)
+    ![useradd](../../images//useradd.PNG)
   
   - To check the uid or username of the user logged in user **`whoami`** command.
 
@@ -53,7 +53,7 @@
     [~]$ useradd -u 1009 -g 1009 -d /home/robert -s /bin/bash -c ”Mercury Project member" bob
     ```
 
-    ![manage](../images/manage.PNG)
+    ![manage](../../images//manage.PNG)
      
   - To delete a user use **`userdel`** command
 

docs/06-Security and File Permissions/04-Access Control Files.md → docs/06-Security-and-File-Permissions/04-Access-Control-Files.md

@@ -16,7 +16,7 @@
     USERNAME:PASSWORD:UID:GID:GECOS:HOMEDIR:SHELL
     ```
    
-    ![passwd](../images/passwd.PNG)
+    ![passwd](../../images//passwd.PNG)
 
   - Password are stored under **`/etc/shadow`**
 
@@ -28,7 +28,7 @@
     USERNAME:PASSWORD:LASTCHANGE:MINAGE:MAXAGE:WARN:INACTIVE:EXPDATE
     ```
 
-    ![shadow](../images/shadow.PNG)
+    ![shadow](../../images//shadow.PNG)
 
   - Check the groups **`bob`** belongs too
 
@@ -37,7 +37,7 @@
     NAME:PASSWORD:GID:MEMBERS
     ```
 
-    ![egp](../images/egp.PNG)
+    ![egp](../../images//egp.PNG)
 
 # HANDS-ON LABS
 

docs/06-Security and File Permissions/05-File Permissions.md → docs/06-Security-and-File-Permissions/05-File-Permissions.md

@@ -5,10 +5,10 @@
   - In this lecture we will learn about various file type identifiers.
   - We will also learn about various Linux file permissions that can be applied on the file or the directory.
 
-    ![perm](../images/perm.PNG)
+    ![perm](../../images//perm.PNG)
 
 
-    ![type](../images/type.PNG)
+    ![type](../../images//type.PNG)
 
 
   #### Directory Permission
@@ -35,7 +35,7 @@
 
   - Linux file permissions are defined as 
 
-    ![filep](../images/filep.PNG)
+    ![filep](../../images//filep.PNG)
 
   #### Modifying file permissions
 

docs/06-Security and File Permissions/06-SSH and SCP.md → docs/06-Security-and-File-Permissions/06-SSH-and-SCP.md

@@ -45,15 +45,15 @@
     bob@caleston-lp10 ~]$ ssh-keygen –t rsa
     ```
 
-    ![key](../images/key.PNG)
+    ![key](../../images//key.PNG)
 
   - To copy the Public key from the client to the remote server
 
     ```
     bob@caleston-lp10 ~]$ ssh-copy-id bob@devapp01
     ```
 
-    ![copy](../images/copy.PNG)
+    ![copy](../../images//copy.PNG)
 
  
   - Now **`Bob`** can login to remote server without password
@@ -62,15 +62,15 @@
     [bob@caleston-lp10 ~]$ ssh devapp01
     ```
 
-    ![pless](../images/pless.PNG)
+    ![pless](../../images//pless.PNG)
 
   - Public Key is copied to the remote server at :
 
     ```
     [bob@caleston-lp10 ~]$ cat /home/bob/.ssh/authorized_keys
     ```
    
-    ![auth](../images/auth.PNG)
+    ![auth](../../images//auth.PNG)
 
   #### SCP
 
@@ -86,4 +86,4 @@
      [bob@caleston-lp10 ~]$ scp –pr /home/bob/media/ devapp01:/home/bob
      ```
      
-     ![scp](../images/scp.PNG)
+     ![scp](../../images//scp.PNG)

docs/07-Networking/02-DNS.md

@@ -70,18 +70,18 @@
 
 # DOMAIN NAMES
 
-  ![DNS](../images/dns.PNG)
+  ![DNS](../../images//dns.PNG)
 
   - .com - Commerical or General Purpose.
   - .net - Network or General Purpose.
   - .edu - Education Purpose
   - .org - Organizations for non profit organizations etc.
 
-  ![Root](../images/root.PNG)
+  ![Root](../../images//root.PNG)
 
 # RECORD TYPES
 
-  ![Record](../images/record.PNG)
+  ![Record](../../images//record.PNG)
   
   - A - IP to host names.
   - AAAA - Storing ipv6 to hostnames.

docs/07-Networking/03-Networking Basics.md → docs/07-Networking/03-Networking-Basics.md

@@ -6,7 +6,7 @@
 
   - Switching helps to connect the interface within same network.
 
-    ![switch](../images/switch.PNG)
+    ![switch](../../images//switch.PNG)
 
   - To see the interfaces on the hosts use **`ip link`** command
 
@@ -26,7 +26,7 @@
 
   - Router helps to connect to two seprate networks together.
 
-    ![route](../images/routing.PNG)
+    ![route](../../images//routing.PNG)
 
   - To see the existing routing table configuration run the **`route`** command.
 

docs/07-Networking/04-Troubleshooting.md

@@ -5,7 +5,7 @@
   - In this lecture we will be going to troubleshooting the issue that **`Bob`** is facing.
   - Bob is not able to reach to the repository server and he get the error as show below.
 
-    ![site](../images/site.PNG)
+    ![site](../../images/site.PNG)
 
   #### Check Interfaces
 
@@ -62,12 +62,12 @@
     [caleston-repo-01: ~]$ netstat -an | grep 80 | grep -i LISTEN
     ```
 
-    ![net](../images/net.PNG)
+    ![net](../../images/net.PNG)
     
   - To bring up the interface up use below command.
 
     ```
     [caleston-repo-01: ~]$ ip link set dev enp1s0f1 up
     ```
 
-    ![iplink](../images/iplink.PNG)
+    ![iplink](../../images/iplink.PNG)

docs/08-Storage in Linux/02-Storage Basics.md → docs/08-Storage-in-Linux/02-Storage-Basics.md

@@ -7,7 +7,7 @@
 - External Storage Devices such as DAS,NAS, and SAN.
 - LVM in Action.
 
-  ![Disk](../images/disk.PNG)
+  ![Disk](../../images//disk.PNG)
 
   #### List all Block devices
 
@@ -31,7 +31,7 @@
 
   #### Partition Types - 
   
-  ![Part](../images/partition.PNG)
+  ![Part](../../images//partition.PNG)
 
   - PRIMARY - Use to Boot an Operating System.
   - EXTENDED - Can host logical partitions but cannot be used on its own.

docs/08-Storage in Linux/03-File System in Linux.md → docs/08-Storage-in-Linux/03-File-System-in-Linux.md

@@ -4,7 +4,7 @@
 
   - In this lecture we will cover the most commonly used file systems from EXT2 to EXT4.
 
-    ![fs](../images/fs.PNG)
+    ![fs](../../images/fs.PNG)
 
   #### Working with Ext4 
 
@@ -46,7 +46,7 @@
     ```
   - **`fstab`** file attributes
 
-    ![fstab](../images/fstab.PNG)
+    ![fstab](../../images/fstab.PNG)
 
 # HANDS-ON LABS
 

docs/08-Storage in Linux/05- LVM.md → docs/08-Storage-in-Linux/05-LVM.md

@@ -5,7 +5,7 @@
  - LVM allows grouping of multiple physical volumes, which are hard disks or partitions into a volume group.
  - Volumegroups can be carve out logical volumes.
 
-   ![LVM](../images/lvm.PNG)
+   ![LVM](../../images/lvm.PNG)
 
   #### Working with LVM
 
@@ -159,7 +159,7 @@
      /dev/mapper/caleston_vg-vol1 2.0G 1.6M 1.9G 1% /mnt/vol1
      ```
 
-     ![LVM2](../images/lvm2.PNG)
+     ![LVM2](../../images/lvm2.PNG)
 
 # HANDS-ON LABS
 

docs/09-Service management with SYSTEMD/03-SYSTEMD Tools.md → docs/09-Service-management-with-SYSTEMD/03-SYSTEMD-Tools.md

@@ -13,7 +13,7 @@
      during the system boot.
    - It is also used to **`LIST AND MANAGE UNITS`** and **`LIST AND UPDATE TARGETS`**
 
-      ![Systemctl](../images/systemctl.png)
+      ![Systemctl](../../images/systemctl.png)
 
     ### Systemctl Commands 
 
@@ -58,7 +58,7 @@
 
     - Besides **`active (running)`** state there are few other state that you should be aware off.
         
-      ![Other](../images/otherstate.PNG)
+      ![Other](../../images/otherstate.PNG)
 
     - Running **`systemctl daemon reload`** command after making changes to service unit file reloads the system manager configuration and makes the systemd aware of the changes. 
 
@@ -101,7 +101,7 @@
    - The systemd-journald service is responsible for systemd’s log collection, and it retrieves messages from the kernel    systemd services, and other sources.
    - Very useful when you are troubleshooting issues with systemd services.
      
-      ![Journalctl](../images/journalctl.png)
+      ![Journalctl](../../images/journalctl.png)
 
    - Using **`journalctl`** commands print all the log entries from oldest to the newest.
    - Using **`journalctl -b`** command print all the logs from the current boot.