Linux Notes

Some notes on Linux, perhaps quite old

Initial Setup

Fedora

To install Fedora from the Live User:

• Application->System Tools->Install to Hard Drive

To enable remote access:

• Fedora now defaults to firewall on so you probably need to run:

   system-config-firewall

It may not be installed so need to yum install system-config-firewall. There is another firewall tool used by default, but it isn't yet feature complete so I still use system-config-firewall. Then allow port 22.

Also be sure that sshd is started/enabled:

   systemctl enable sshd.service
   systemctl start sshd.service

Find current Linux Version

ubuntu

   cat  /etc/lsb-release

Updating, Upgrading and Installing

Update Fedora

 sudo yum update        # downloads and installs out-of-date RPMs
 sudo yum list installed # shows what is installed
 sudo yum list                # shows all packages available.

Update Ubuntu

 sudo apt-get update    # updates the databases
 sudo apt-get upgrade   # downloads and installs the .apt files

Upgrade Ubuntu

1. See https://help.ubuntu.com/community/NattyUpgrades
2. In System->Administration->Update Manager, click on "Settings" and chose the set of releases you wish.

Network Upgrade for Ubuntu Servers

   sudo apt-get install update-manager-core
   sudo do-release-upgrade

Ignoring TCP Reset

Mac:

   ipfw add 1000 drop tcp from any to me tcpflags rst in

Linux:

   iptables -I FORWARD -p tcp --tcp-flags RST RST -j DROP