Tag: Silicon Valley

Open-source Physics On Linux

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First thing Open Source Physics offer is an complete group of Java applications that do simulation of special physical systems. These simulation are all on paper in Java, they can be scuttle on operating systems additional than Linux. The categories enclosed comprise astronomy, energy and fascination, conventional mechanics, quantum procedure, optics and relativity. On the main Web site, you moreover can do a detailed look for or peruse by topic to discover simulation. The simulation program are packaged as .jar files, so you can download them and scurry them only by typing:

java -jar filename.jar

Lets you run the recreation on your desktop because these are Java programs can put them a web site and run them within a browser. Comprise them on your science site and illustrate visitors simulation of the systems you strength be trying to explain. Some of the simulation provide by Open Source Physics have parameter that you can change the runtime facts of the simulation. These parameters strength be items like a lot, velocity or pasture strength. If the simulation you are using does have settable parameters, there will be an choice to set aside the model information off to a data file.

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Once you have moved out past the substance cover by the pre-packaged simulation, you probably will desire to see what extra systems you can copy and analyze. Open Source Physics offer a system called Easy Java Simulations (EJS) to do presently that. This Java program give a pleasant and trouble-free interface to permit for prototyping, hard and allocate own simulations. EJS is superior superiority for educational situations because it allow for fairly composite simulations without require to recognize a huge transaction about programming.

java -jar EjsConsole.jar

Pops up a comfort window where set some initialization parameters and create one or more EJS instance. A modeling openand authoring tool where you can classify your physical system and the facts of what you are demanding to model. Run these models as of within the authoring tool,try things out and see whether you are getting the results you be expecting. Once happy with the simulation, the authoring tool has option to permit you to enclose the full simulation as a only bundle that you can share with others. This is huge when you are rising code for a class, because you can describe simulations for the correct physical systems want to teach and then package it for students.

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Linux System Administration Mission

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A place of Linux system administration has its own in the ladder of in sequence technology specializations. A number of people excel in unique areas of gratis software skill but have not desirable to learn system administration. Concentrate in configuring e-mail or writing applications use Apache and My SQL. May focus simply on Domain Names services and know obscure ways of scenery up servers on provider lines that regularly change IP addresses. To baby sit a demanding server or servers, you strength not have the character or have erudite the excess of skill required to do so.

A case in which discover that one of the web sites handle has gone down the server has protected up and nil works. How do you get well in the best ever possible way? Such an occasion happen to me two weeks ago. The several million hits on our server, we had a district of a million unique guests concerted in a five-hour period. A reboot permissible the system to go back to service for a little minutes, but then it locked up again. We use less than ten percent of our system assets, so we thought we had ready for the hottest day of the year. Perceptive the server and all the consecutively processes, we could close a number of down and center on allow a huge boost in immediate connections to our database. Several thousand subscribers, we twisted off process such as those that controlled comments to registered reader. The day with only a dumpy period of down time. The flow of traffic rock our boat.

Service outages such as the one describe on top of can happen in the limitations of a confidential net work. Numerous services knowledge crest custom at exact times. Administrators identify that one of the heaviest loads they will have through the day occurs first obsession in the morning, when people make sure their e-mail. People reach your destination at work about the same time, eccentric up their e-mail clients and interpret mail while drinking coffee. The mail server strength skill 75% of its use between 8 and 10 AM. Gateway traffic also increase and band width on the network bogs down. Make available divide devoted servers for mail, steering, proxy and opening services.

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Linux Network Configuration And Troubleshooting Commands

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There are a number of network strategy or media are anxious to form computer network. computer burdened with Linux operating system can as brilliant be a division of network whether it is modest or huge network by its multi tasking and multi user natures. Preserve of system and network up and operation is a task of system network Administrators job.

ifconfig : if con fig command is developed to initialize an interface, assign IP address to interface and facilitate disable interface on command. Among this command you can view IP address and hardware and MAC address allot to the interface and also MTU size. if con fig with edge command only shows correct interface facts like IP address, MAC address etc. With an options will exhibit all accessible interface details if it is disable also.

Assigning IP Address and Gateway: Assigning an IP address and gateway to interface on the fly. The place will be separate in case of a system reboot.
Enable or Disable Specific Interface: To facilitate or disable specific Interface.

We utilize case command as follows.

Enable eth0

Setting MTU Size: By defaulting MTU size is 1500. We can place required MTU size with under command.

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Set Interface in immoral mode: Network interface only straight packet belongs to that exacting NIC. If you put frontier in corrupt mode it will establish all the packets. This is extremely functional to detain packet and examine later.

PING Command: PING command is the most favorable way to make sure connectivity between two nodes. It is local area network or extensive area network . Ping use ICMP Internet control communication protocol to chat to other devices. Ping host name of ip address using lower command.

ping 4.2.2.2

In Linux ping command preserve executing until you cut short. Ping with -c option exit after N number of demands. TRACER OUTE Command: Trace route is a network troubleshooting value which shows number of hops full to arrive at objective also determine packet traveling path. Under we are tracing method to global DNS server IP tackle and able to attain reason also show channel of that pack is traveling.

NET STAT Command: Net stat command exhibit relation info, routing table in order etc. Two displays routing table information use option as -r.

DIG Command : Dig query DNS related information like a record, CNAME, MX record etc. This command frequently uses to troubleshoot DNS related query.
NS LOOK UP Command : ns look up command also exploit to find out DNS related query. The following examples shows A record IP address of

tecmint.com.

nslookup www.tecmint.com

ROUTE Command : Route command as well explain and control IP steering table. Watch evasion routing table in Linux, method the following command
route

HOST Command : Host command to discover name to IP or IP to name in IPv4 or IPv6 and as fine query DNS events.

ARP Command: ARP is helpful to view add the inside of the kernels ARP tables. To see default table use the command as.

ETHTOOL Command: Eth tool is a stand-in of mii-tool. It is to thought setting the speed and duplex of your network interface card. Set duplex lastingly in /etc/sysconfig/network-scripts/ifcfg-eth0 with ETHTOOL_OPTS changeable.

IWCONFIG Command : IW con fig command in Linux is used to configure a wireless network interface. Recognize and set the basic Wi-Fi facts like SSID channel and encryption. Refer man page of iw con fig to classify additional.
HOST NAME Command : Host name is to know in a network. Execute host name command to observe the host name of your box. Set host name lastingly in /etc/sys config/network. Require to reboot box one time set a proper host name.

GUI tool system-con fig-network : Type system config net work in command prompt to configure net work setting and you will get nice graphical user interface (GUI) which can also utilize to configure IP address, gateway, DNS etc.

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