Network Monitoring & Management. A few Linux basics
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1 Network Monitoring & Management A few Linux basics
2 Our chosen platform Ubuntu Linux LTS 64-bit LTS = Long Term Support no GUI, we administer using ssh Ubuntu is Debian underneath There are other platforms you could use: CentOS / RedHat, FreeBSD, This isn t a UNIX admin course, but some knowledge is necessary: Worksheets are mostly step-by-step Please help each other or ask us for help
3 You need to be able to. Be root when necessary: sudo <cmd> Install packages $ sudo apt-get install <pkg> Edit files $ sudo joe /etc/mailname $ sudo vi /etc/mailname Check for the process apache $ ps auxwww grep apache Start/Stop services $ service <NAME> start stop restart
4 joe editor Ctrl-C quit without saving Ctrl-K X to quit and save Cursors work as you expect We provide a PDF reference in the materials
5 vi editor The default editor for all UNIX and Linux distributions Can be difficult to use If you know it and prefer to use vi please do We provide a PDF reference in the materials
6 Other tools Terminate foreground program: ctrl-c Browse the filesystem: cd /etc ls ls -l Rename and delete files mv file file.bak rm file.bak
7 Viewing files Sometimes files are viewed through a pager program ( more, less, cat ). Example: man sudo Space bar for next page b to go backwards / and a pattern (/text) to search n to find next match N to find previous match q to quit
8 Using ssh Configuring and using ssh incorrectly will guarantee a security compromise The wrong way: Using simple passwords for users Allowing root to login with a password In reality allowing any login with password The right way: Disable all password access Disable root access with password Some disable root access completely
9 Using ssh: our way For class we will compromise. Our way: Allow user login with improved passwords Allow root login with ssh keys only Understanding password strength, see next slide * *
10
11 No passwords are better
12 Exercises Please follow the instructions on the next few slides to practice a bit with Linux
13 Using ssh to connect to your VM Login to your virtual machine using ssh On Windows use putty.exe Connect to pcn as user sysadm We ll do that now... Accept Public Key when prompted Windows users can download putty from and connect Instructors will now assist everyone to connect
14 Improve password for sysadm Method 1 (moderately strong) 8 characters or more Not a word in any language A mix of numbers, upper and lower case Include some punctuation characters Method 2 (stronger) Use four words of 6 characters, or more Use unrelated words Examples (do not use these!) 1. Tr0ub4dor&3 2. CorrectHorseBatteryStaple
15 Change sysadm password Logged in as user sysadm do: $ passwd changing password for sysadm. (Current) UNIX password: <enter current password> Enter new UNIX password: <enter new password> Retype new UNIX password: <confirm new password> If everything goes well you will see the message: passwd: password updated successfully
16 Disable root user password access Logged in as user sysadm do: $ sudo editor /etc/ssh/sshd_config Find the lines that say: #PermitRootLogin no PermitRootLogin without-password No changes are needed, please leave these lines as they are and be sure you don t do this! PermitRootLogin yes
17 Installing packages 1. Exit from the file /etc/ssh/sshd_config 2. Install the joe editor package $ cd (takes you to your home directory) $ sudo apt-get update $ sudo apt-get install joe 3. Install the postfix mailserver and some utilities: $ sudo apt-get install postfix mutt mailutils 1. Select Internet Site when prompted 2. Accept the hostname presented. 3. For both screens tab to <Ok> and press ENTER to continue 4. Restart the mailserver: $ sudo service postfix restart
18 Troubleshooting: Your logs Log files are critical to solve problems. They reside (largely) in /var/log/ Some popular log files include: /var/log/syslog /var/log/apache2/error.log /var/log/mail.log And, many, many more To view the last entry in a log file: $ Sudo tail /var/log/syslog To view new entries as they happen: $ Sudo tail f /var/log/syslog Press ctrl-c to exit from the tail command.
19 Using search tricks with help (man) At the prompt type: - man ssh Search for ports by typing /ports press <ENTER> Press n to go to the next occurrence of port do this several times. Press N to search backwards. Press p to go to the start. Search on /-p and see what you find. Press h for all the keyboard shortcuts. Press q to quit from the man page.
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