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We have already connected to a remote computer in this class! - Review

What other types of computers can we log into?

1. remote personal computers
2. storage systems
3. servers
4. supercomputers

1. What is a server?

Some Common Features of a Computer/Server

  • Hard drive/solid-state drive: non-volatile data storage and retrieval (space measured in GB or TB).
  • Processor (CPU): perform computational tasks (speed measured in GHz).
  • Core: an independent processor.
  • Memory/RAM: temporary volatile storage of data (space measured in GB).
  • CPU cache: faster memory for temporary storage of copies of frequently used data (usually measured in MB).

2. How are servers accessed?

  • Shell or terminal
  • GUI (Cyberduck or Filezilla; or web browser)

Accessing servers via the command line (ssh and sftp)

ssh….secure shell.

$ ssh username@server_address

A common method for downloading data from a public server (ftp)

ftp….file transfer protocol.

$ ftp	

Transferring data between computers/servers (scp)

scp….secure copy protocol.

$ scp /path/to/local/file username@hostname:/path/to/remote/file

Run multiple sessions in one window or keep processes running on a remote server without a job scheduler (GNU screen)

$ screen

*See UNIX cheat sheet and exercises for additional information.

wiki/2018networking.1535456626.txt.gz · Last modified: 2018/08/28 05:43 by erin