Printing in Software

Creation QR-Code in Software Printing

This chapter discussed the Common UNIX Printing System (CUPS) We touched on simple printer management tasks, such as adding printers via the CUPS web interface and from the command line, managing printers, and managing print jobs under Linux Usage of some common client tools to manage print jobs in Linux was discussed, with examples provided We also discussed some of the configuration directives that are used in CUPS main configuration file, cupsdconf However, we were only able to scratch the surface of the abilities and features of CUPS Fortunately, the software comes with extensive online documentation, which is a highly recommended read if you are plan on using CUPS extensively to deploy and manage printers in your environment The same documentation is also available online at the CUPS home page, wwwcupsorg Once you have printing set up on your Linux server, you ll find that it does its job quite nicely and lets you focus on new and interesting challenges Problems that arise with printing services afterward typically point to problems with the printer itself, such as paper jams, user abuse, or office politics

anually configuring IP addresses for a handful of systems is a fairly simple task However, manually configuring IP addresses for an entire department, building, or enterprise of heterogeneous systems can be daunting The Linux DHCP (Dynamic Host Configuration Protocol) client and server can assist with these tasks The client machine is configured to obtain its IP address from the network When the DHCP client software is started, it broadcasts a request onto the network for an IP address If all goes well, a DHCP server on the network will respond, issuing an address and other necessary information to complete the client s network configuration Such dynamic addressing is also useful for configuring mobile or temporary machines Folks who travel from office to office can plug their machines into the local network and obtain an appropriate address for their location In this chapter, we ll cover the process of configuring a DHCP server and client This includes obtaining and installing the necessary software and then walking through the process of writing a configuration file for it At the end of the chapter, we ll step through a complete sample configuration NOTE DHCP is a standard Thus, any operating system that can communicate with other DHCP servers and clients can work with the Linux DHCP tools One common solution includes using a Linux-based DHCP server in office environments where there are a large number of Windows-based clients The Windows systems can be configured to use DHCP and contact the Linux server to get their IP addresses The Windows clients will not necessarily know nor care that their IP configuration information is being provided by a Linux server, because DHCP is a standards-based protocol, and most implementations try to adhere to the standard

When a client is configured to obtain its address from the network, it asks for an address in the form of a DHCP request A DHCP server listens for client requests Once a request is received, it checks its local database and issues an appropriate response The response always includes the address and can include name servers, a network mask, and a default gateway The client accepts the response from the server and configures its local settings accordingly The DHCP server maintains a list of addresses it can issue Each address is issued with an associated lease, which dictates how long a client is allowed to use the address before it must contact the server to renew the lease When the lease expires, the client is not expected to use the address any more As such, the DHCP server assumes that the address has become available and can be put back in the server s pool of addresses The implementation of the Linux DHCP server includes several key features common to many DHCP server implementations The server can be configured to issue any free address from a pool of addresses or to issue a specific address to a specific machine In addition to serving DHCP requests, the Linux DHCP server serves Bootstrap Protocol (BOOTP) requests

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