1. Linux O_o By Mohamed ahmed abo-elfetoh Aka 'aboelfetouh'

2. Build and admin guy # !

4. GPL.

5. Linux Structure.

6. How it works.

7. Build an admin !

8. Job seekers.

11. Get source code.

12. Distribute the altered source and binaries.

13. - The aim of the GPL is to keep software “free” , so everyone can adapt its own needs.

15. 2- Bios : a small program in EEPROM (Electrical Erasable Programmable Read Only Memory). Bios function check memory check for the availabiltity aboot devices loads Master Boot Record (MBR) of the first availale boot device . MBR (master boot record) : it’s size 512 bytes 1- power on …. 3- Boot Loader : after loades MBR , boot loader make its function . function : check partition table and looks for a partition that is marked “active”. Examples of boot loader grub and lilo ,the most common now is grub (grand unified boot loader). Boot loader stored in MBR.

16. 4- kernal : When the user selects a Linux operating system in the boot loader, then the boot loader will load the Linux kernel. Kernal function : it detects all hardware . switches the cpu to multitasking and multiuser mode. For more informations about kernal back to this topic linux kernal . 5- Init : started by the kernal , it decide runlevel mode . runlevels 0: halt 1: single user mode 2: multiuser without NFS 3: full multiuser mode 4: unused 5: multiuser with graphical login 6: reboot

19. Virtualization and managing virtual machines

20. Enterprise monitoring and management frameworks

21. Working in structured change management processes for highly available enterprise systems

22. VMware

23. Perl, Bash, Python scripting

24. Work well with others

25. Self motivated

26. Ability to learn new technologies on own

27. Knowledge of the Linux kernel and kernel modules

28. IT security

29. Familiarity with open source tools, monitoring systems,

30. hardware troubleshoot, tracking, resolution, and routine maintenance with security updates

32. Strong technical aptitude and ability to research and solve complex issues independently

33. Systems administration vendor certification

34. Working exposure to networked storage (SAN, NAS) concepts

35. ITIL Foundation certification

36. Symantec

37. Solaris 10 experience

38. Red Hat clusters

39. RHCE certification

42. Scripting

43. Network

44. Communication

45. Development

46. Security

47. Design

48. Shell

49. Engineering

52. - So what happens when package A (that you installed from source)

53. depends upon package B (that was installed from a .deb binary)

54. and package B is upgraded from the update manager?

55. Neglecting updates

58. - “The root password is the key to the kingdom.”

59. - ” So why would you make the key to the kingdom simple to crack?

60. Avoiding the command line

61. - “But there are times when the command line is easier, faster, more secure”

62. Not keeping a working kernel installed

63. - “you don’t need 12 kernels installed on one machine ! .

64. But you do need to update your kernel ”

66. - “Permissions can make your life really easy”

67. - 'rwx' method

68. Logging in as root user

69. - “Do NOT log in as root”

70. - “when you log on as a standard user, all running X applications still have access only to the system limited to that user. If you log in as root, X has all root permissions.”

74. - /var/log , Possible security issue?

77. Thank You !

78. اللي عايز يتواصل معايا لا مؤاخذة :) Twitter : aboelfetouh_ Gmail : m.aboelfetouh@gmail.com