Download Ubuntu Linux Toolbox: 1000+ Commands for Ubuntu and Debian by Christopher Negus PDF

By Christopher Negus

This bestseller from Linux guru Chris Negus is jam-packed with an array of recent and revised materialAs a longstanding bestseller, Ubuntu Linux Toolbox has taught you the way to get the main out Ubuntu, the world's preferred Linux distribution. With this eagerly expected re-creation, Christopher Negus returns with a bunch of recent and multiplied insurance on instruments for handling dossier structures, how one can connect with networks, suggestions for securing Ubuntu structures, and a glance on the newest long-term aid (LTS) unencumber of Ubuntu, all geared toward getting you up and working with Ubuntu Linux fast. Covers install, configuration, shell primer, the computer, administrations, servers, and securityDelves into assurance of renowned functions for the net, productiveness suites, and e-mailHighlights constructing a server (Apache, Samba, CUPS) Boasts a convenient trim measurement so you might take it with you at the go

"Ubuntu Linux Toolbox, moment Edition" prepares you with a bunch of up to date instruments for today's setting, in addition to multiplied insurance on every little thing you recognize to hopefully commence utilizing Ubuntu at the present time.

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Read or Download Ubuntu Linux Toolbox: 1000+ Commands for Ubuntu and Debian Power Users (2nd Edition) PDF

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Extra info for Ubuntu Linux Toolbox: 1000+ Commands for Ubuntu and Debian Power Users (2nd Edition)

Sample text

Two very important Postfix parameters, mynetworks and mynetworks_style, control which hosts are allowed to use your server as a relay. Setting these incorrectly may allow your server to be abused by spammers and the likes, so it is important that you get them right. By default, all hosts on the subnets that your server is directly connected to will be allowed access. This should be secure in most cases. These parameters and other methods of allowing relay access will be discussed in depth in Chapter 5.

If you have multiple network interfaces and you do not want Postfix to use all of them, you can adjust this parameter to list the addresses or hostnames of the interfaces you do want Postfix to use. Some Linux distributions set inet_interfaces to localhost by default, which means that Postfix will listen only on the loopback interface. This makes at least some sense for workstations, but it is obviously completely unusable for servers that need to receive messages from foreign hosts. cf to disable it.

38 ] Chapter 2 Parameter delay_warning_time Description By default, Postfix does not send a warning if a message cannot be delivered for some time. Setting this parameter to a particular duration, say 5h for five hours, will cause Postfix to send a single warning message for each message that has been undeliverable for that period of time. A word of caution, though: Your users may not be able to interpret this warning message correctly. Even though Postfix clearly states that it is only a warning and that the message does not need to be resent, many users do not understand this and resend their delayed message anyway.

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