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Martin Hope
Marcos Sander
Asked: 2013-02-11 19:59:54 +0800 CST
  • 180

I have an array which gets filled with different error messages as my script runs.

I need a way to check if it is empty of not at the end of the script and take a specific action if it is.

I have already tried treating it like a normal VAR and using -z to check it, but that does not seem to work. Is there a way to check if an array is empty or not in Bash?

bash
Martin Hope
HXH
Asked: 2012-09-06 00:33:27 +0800 CST
  • 180

We all know how to enable a website using apache on Linux. I'm pretty sure that we all agree on using the a2ensite command.

Unfortunately, there is no default equivalent command that comes with Nginx, but it did happen that I installed some package on ubuntu that allowed me to enable/disable sites and list them.

The problem is I don't remember the name of this package.

Does anybody know what I'm talking about?

Please tell me the name of this package and the command name.

nginx
Martin Hope
Daryl Spitzer
Asked: 2011-05-26 14:41:02 +0800 CST
  • 178

When I use ssh -X on my Mac (running OS X 10.6.7) to connect to my Ubuntu (11.04) box, I get the following warning:

Warning: untrusted X11 forwarding setup failed: xauth key data not generated Warning: No xauth data; using fake authentication data for X11 forwarding.

Is there something I can do to make this warning go away? If not, can I safely ignore it?

X11 forwarding seems to work fine, though I do see this message:

Xlib: extension "RANDR" missing on display "localhost:10.0".

Is that related to the warning? (I'm guessing not. If it's not, I'll file a new question about that.)

ssh warning x11forwarding
Martin Hope
sdot257
Asked: 2010-02-26 07:07:07 +0800 CST
  • 179

Found out today that running screen as a different user that I sudo into won't work!

i.e.

ssh bob@server         # ssh into server as bob
sudo su "monitor" -
screen                 # fails: Cannot open your terminal '/dev/pts/0'

I have a script that runs as the "monitor" user. We run it in a screen session in order to see output on the screen. The problem is, we have a number of user who logs in with their own account (i.e. bob, james, susie, etc...) and then they sudo into the "monitor" user. Giving them access to the "monitor" user is out of the question.

gnu-screen sudo
Martin Hope
Lin
Asked: 2009-08-31 09:57:08 +0800 CST
  • 180

From reading, it seems like DNS failover is not recommended just because DNS wasn't designed for it. But if you have two webservers on different subnets hosting redundant content, what other methods are there to ensure that all traffic gets routed to the live server if one server goes down?

To me it seems like DNS failover is the only failover option here, but the consensus is it's not a good option. Yet services like DNSmadeeasy.com provide it, so there must be merit to it. Any comments?

domain-name-system
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