CIS 225 Fall 2014 Lecture 13

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CIS 225

Lecture 13: Service & Process Management

What is a Service?

Services

Programs that run in the background on an operating system
Performs many important functions automatically
Consumes system resources

Services Management

Service Properties

Startup Types

Automatic - Starts at system boot
Automatic (Delayed) - Starts shortly after system boot
Manual - Starts only when needed
Disabled - Will not start/run at all

Windows 8 Pseudo Accounts

LocalSystem - system-level tasks & services
LocalService - fewer rights than LocalSystem
NetworkService - fewer rights than LocalService, but allows network access

Services Recovery

Recovery Options

Take No Action
Restart the Service
Run a Program
Restart the Computer

Important Services

Computer Browser - Network file sharing
DHCP Client & DNS Client - Network addressing
Microsoft Antimalware Service
Performance Logs & Alerts
Print Spooler
Windows Update

Service Host Process

svchost.exe
Process that runs a number of system services
Helps conserve system resources (1 process instead of many)
Targeted by malware & viruses

Linux Services - daemons

Daemons run as background processes in Linux
Usually started by the init process at boot
Process names typically end in 'd'

Starting Linux Services - init

The init process is loaded first
It then loads the services for a particular runlevel
See /etc/init.d/ and /etc/rc*.d/ directories

Starting Linux Services - Upstart

Currently in development for Ubuntu
Allows services to be started based on events
Can monitor and restart services
Very similar to Windows Service Management

Linux Daemon Commands

init

```
sudo /etc/init.d/apache2 start
```
```
start, stop, reload, restart, status
```

Upstart

```
sudo service ufw start
```
```
start, stop, status
```

What is a Process?

Processes

Computer program being executed
May contain multiple threads of execution
Consumes resources such as memory & processing time

Process Lifecycle

Image Credit: Wikipedia

Task Manager

Process Information

PID - Process ID
Memory Usage - Process ID
Description - Process ID
Image Path - Process ID
Command Line - Process ID
Ports - Network Socket Ports

Ubuntu System Monitor

Ubuntu Processes - top

Reading

Windows 8 Book - Chapter 8
Ubuntu Unleashed - Chapter 9

Assignments

Lab 6 - Service & Process Management and Software Install: Due 10/20 @ 11:30 AM