Grid Shell hanging after grid upgrade from 3.1 to 3.5
After grid upgrade from 3.1 to 3.5, login GUI, start the grid shell from Dashboard , the grid shell would hang and not working, to resolve this problem, you will need to delete cookies in Internet Explorer. On IE, click the 'Tools' menu; select 'Internet Options' from the menu that appears. Click 'Delete Cookies' on the dialog box.
Prevent console boot messages from clearing once login prompt displays.
When viewing the appliance statup in 'xm console' or 'comp login --text' once it gets to the login prompt it will usually clear the screen and you can no longer go back to see the messages. To prevent this you can change the following line in the appliance /etc/inittab adding the --noclear and --noissue options:
From:
# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty console
To:
# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty --noissue --noclear console
Now on the next reboot it will no longer clear the screen when the login prompt comes up.
This also applies to the physical grid nodes but would look like:
# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty --noissue --noclear tty1
Prevent slow ssh logins
Sometimes ssh will hang for a long time while ssh into an appliance. This is due to dns lookup failing and timing out. You can try to set 'UseDNS no' in the sshd_config but if this is already done and still have long wait times before ssh logs you in its most likely due to gssappi. gssappi also does a dns lookup separate from sshd dns lookup. To disable gssappi set the following to no in sshd_config:
GSSAPIAuthentication no
Xen has a "noreboot" parameter that can be passed on the Xen command line in grub. When there is a crash, the server won't reboot. This would give the customer a chance to look at the console of the server with the crash trace, but it would require manual intervention in order to bring back the server and it also assumes the entire trace fits in a single screen since there is no scrolling.
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