PacNOG 7: Pango Pango, American Samoa Terminal and Console Access Hervey Allen Network Startup Resource Center.

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Presentation transcript:

PacNOG 7: Pango Pango, American Samoa Terminal and Console Access Hervey Allen Network Startup Resource Center

Contents Virtual terminals Mouse daemon buffer (if available) Copy/paste between terminals OOB and serial console access Server/Switch console access using minicom.

(Virtual) Consoles Usually you have 6:  tty[1-6] tty7 takes you back to X Access them using ALT-CTRL-F[1-7] Virtual terminals are very useful. If you run without a GUI, then they are your friend. Some Unix/Linux versions have optional mouse daemons in text mode, such as FreeBSD.

(Virtual) Consoles Depending on Unix/Linux version these are defined in:  /etc/default/console-setup (Upstart)  /etc/init/tty[1-6].conf (Upstart)  /etc/inittab  /etc/ttys  /boot/grub/menu.1st (OOB trick)  /etc/init.d/console-setup  /etc/init.d/console-screen.sh

Copy/Paste Between Consoles If you boot without a GUI (no gnome, KDE, etc.) and you have a mouse- daemon, the for example you can:  Highlight text in tty1  Press ALT-CTRL-2 to access tty2  Place mouse in another file  Press middle-mouse button to paste text from tty1

OOB and Serial Console Access OOB or “Out Of Band” access: Critical for remote management of servers. How do you access a machine's BIOS remotely? How do you access RAID BIOS remotely? In Linux tell the boot loader to pass options to the kernel. The kernel can send output to ttyS0. Why is this useful?...

OOB and Serial Console Access Use serial to ethernet converter. With an OOB solution connect to separate IP to view your machine's console. During boot you can see your machine's console using terminal software connecting to a separate IP (user and password almost always required as well). Set Kernel load options (for instance) in /boot/grup/menu.1st

OOB and Serial Console Access Sample /boot/grub/menu.1st file entry: title Ubuntu , kernel server root (hd0,0) kernel /vmlinuz server root=UUID=96e bf7-421e -a4bc-6de1d21eaa97 ro console=ttyS0,38400n8 console=tty0 quiet splash initrd /initrd.img server quiet What does this mean? Key option for OOB serial console access is: console=ttyS0,38400n8 console=tty0 We'll look at an example now...