Managing Process in UNIX/Linux
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The document details a GLC Networks webinar on managing processes in Unix/Linux, led by trainer Achmad Mardiansyah. It includes an overview of Unix processes, process management, signals, and practical exercises, alongside the organization's background and training offerings. The session encourages participant interaction and feedback, aiming to share knowledge and experiences in the field of networking and IT.
Managing Process in UNIX/Linux
- 1. www.glcnetworks.com Managing Process in UNIX/Linux GLC webinar, 24 Dec 2020 Achmad Mardiansyah achmad@glcnetworks.com GLC Networks, Indonesia 1
- 2. www.glcnetworks.com Agenda ● Introduction ● UNIX process ● Process management ● Background vs foreground process ● Signal ● Live practice ● Q & A 2
- 4. www.glcnetworks.com What is GLC? ● Garda Lintas Cakrawala (www.glcnetworks.com) ● Based in Bandung, Indonesia ● Areas: Training, IT Consulting ● Certified partner for: Mikrotik, Ubiquity, Linux foundation ● Product: GLC radius manager ● Regular event 4
- 5. www.glcnetworks.com Trainer Introduction ● Name: Achmad Mardiansyah ● Base: bandung, Indonesia ● Linux user since 1999, mikrotik user since 2007, UBNT 2011 ● Mikrotik Certified Trainer (MTCNA/RE/WE/UME/INE/TCE/IPv6) ● Mikrotik/Linux Certified Consultant ● Website contributor: achmadjournal.com, mikrotik.tips, asysadmin.tips ● More info: http://au.linkedin.com/in/achmadmardiansyah 5
- 6. www.glcnetworks.com Past experiences 6 ● 2020 (Congo DRC, Malaysia): IOT integration, network automation ● 2019, Congo (DRC): build a wireless ISP from ground-up ● 2018, Malaysia: network revamp, develop billing solution and integration, setup dynamic routing ● 2017, Libya (north africa): remote wireless migration for a new Wireless ISP ● 2016, United Kingdom: workshop for wireless ISP, migrating a bridged to routed network ● 2015, West Kalimantan: supporting wireless infrastructure project
- 7. www.glcnetworks.com About GLC webinar? ● First webinar: january 1, 2010 (title: tahun baru bersama solaris - new year with solaris OS) ● As a sharing event with various topics: linux, networking, wireless, database, programming, etc ● Regular schedule ● Irregular schedule: as needed ● Checking schedule: http://www.glcnetworks.com/schedule ● You are invited to be a presenter ○ No need to be an expert ○ This is a forum for sharing: knowledge, experiences, information 7
- 8. www.glcnetworks.com Please introduce yourself ● Your name ● Your company/university? ● Your networking experience? ● Your mikrotik experience? ● Your expectation from this course? 8
- 10. www.glcnetworks.com What is process Process is an instance (execution) of a program. Properties: ● OS will allocate resource to process (CPU, RAM) ● Have a process id ● Can have child process Example: ● Executing command ● Running a GUI ● Open a browser, accessing URL 10
- 11. www.glcnetworks.com Process type ● Foreground ○ Default mode when executing process ○ Will occupy console, cannot do anything else ● Background ○ Usually for daemon/services ○ Can be done using “&” during execution Multitasking? 11
- 12. www.glcnetworks.com Zombie and orphan process ● In normal situation: ○ when a child process is killed, the parent process is updated via a SIGCHLD signal. Then the parent can do some other task or restart a new child as needed. ● In not normal situation: ○ parent process is killed before its child is killed. ○ the "parent of all processes," the init process, becomes the new PPID (parent process ID). In some cases, these processes are called orphan processes. ● Zombie process (Z) ○ This is a zombie or defunct process ○ The process is dead and not being used ● Orphan processes. ○ They have completed execution but still find an entry in the process table. ● ● 12
- 13. www.glcnetworks.com Process vs job ● Process ○ ● Job: ○ 13
- 14. www.glcnetworks.com Process vs thread ● Process ○ Normal procss ● Thread ○ Aka LWP (lightweight process) ○ One process that is divided into several subprocess (aka. thread). ○ The subprocess is not called child process 14
- 16. www.glcnetworks.com Managing process ● Display process: ○ ps ○ Top ● job ● Send signal: ○ kill 16
- 17. www.glcnetworks.com Sending signal to process 17
- 18. www.glcnetworks.com What, why is signal? ● Signals are a limited form of inter-process communication (IPC) ● To send data/command between process ● Typically used in Unix, Unix-like, and other POSIX-compliant operating systems. 18
- 19. www.glcnetworks.com Example of signal 19 Signal Portable number Default action Description SIGABRT 6 Terminate (core dump) Process abort signal SIGALRM 14 Terminate Alarm clock SIGBUS N/A Terminate (core dump) Access to an undefined portion of a memory object SIGCHLD N/A Ignore Child process terminated, stopped, or continued SIGCONT N/A Continue Continue executing, if stopped SIGFPE 8 Terminate (core dump) Erroneous arithmetic operation SIGHUP 1 Terminate Hangup SIGILL 4 Terminate (core dump) Illegal instruction SIGINT 2 Terminate Terminal interrupt signal
- 21. www.glcnetworks.com preparation ● SSH client ● SSH parameters ○ SSH address ○ SSH port ○ SSH username ○ SSH password 21
- 22. www.glcnetworks.com R1 AS11 R2 AS11 E2 E2 E3 E3 E6 R3 AS13 R4 AS13 E2 E2 E3 E3 E6 R5 AS15 R6 AS15 E2 E2 E3 E3 E6 R7 AS17 R8 AS17 E2 E2 E3 E3 E6 R9 AS19 R10 AS19 E2 E2 E3 E3 E6 SW86 192.168.86.X/24 R86 AS86 R85 AS85 R98 R88 AS88 R87 AS87 E6 E6 E3 E3 E5 E2 E5 E3 E3 E2 TOPOLOGY 1 LAB: Mikrotik E6 E6 E2 E6 E6 E6 PC101 E2 PC102 E2 PC103 E2 PC104 E2 PC105 E2 PC106 E2 PC107 E2 PC108 E2 PC109 E2 PC110
- 24. www.glcnetworks.com Interested? Just come to our training... ● Topics are arranged in systematic and logical way ● You will learn from experienced teacher ● Not only learn the materials, but also sharing experiences, best-practices, and networking 24
- 25. www.glcnetworks.com End of slides ● Thank you for your attention ● Please submit your feedback: http://bit.ly/glcfeedback ● Like our facebook page: https://www.facebook.com/glcnetworks ● Slide: http://www.slideshare.net/r41nbuw ● Recording (youtube): https://goo.gl/28ABHU ● Stay tune with our schedule ● Any questions? 25