Even if you don’t use a Nagios monitoring server, you can grep the check_dhcp binary or compile it from source and use the check to test a DHCP-Server. E.g. ./check_dhcp -v -s <dhcp_server_address> -r <expected_ip_address> -m <mac_address_touse>
The pvdisplay command has a -m option to show the mapping of physical extents to logical volumes and logical extents. I have set up the following situation on a test machine: 3 disks of 1GB each added to the system and used as physical volumes for vg_test 6 logical volumes made with various sizes (ranging … Read more
I currently work in an environment that has used Linux for more than a decade. Everybody in the office uses different distros on their desktops as well as the servers. As such, the choices of distribution tend to revolve around a number of things in no particular order: History – Obviously systems like RedHat and … Read more
What is debian-sys-maint used for? One major thing it is used for is telling the server to roll the logs. It needs at least the reload and shutdown privilege. See the file /etc/logrotate.d/mysql-server It is used by the /etc/init.d/mysql script to get the status of the server. It is used to gracefully shutdown/reload the server. … Read more
You can store symlinks as symlinks (as opposed to a copy of the file/directory they point to) using the –symlinks parameter of the standard zip. Assuming foo is a directory containing symlinks: zip –symlinks -r foo.zip foo/ Rar equivalent: rar a -ol foo.rar foo/ tar stores them as is by default. tar czpvf foo.tgz foo/ … Read more
Personally, my favorite (requires bash and other things that are standard on most Linux distributions) The details can depend a lot on what the two things output and how you want to merge them … Contents of command1 and command2 after each other in the output: cat <(command1) <(command2) > outputfile Or if both commands … Read more
You are right. It’s annoying behavior. $ zcat foo.txt.gz zcat: can’t stat: foo.txt.gz (foo.txt.gz.Z): No such file or directory Try this: $ zcat < foo.txt.gz asdfadsf
The short answer: Either one is what you are looking for, but my first choice would be memcache (the first one you listed), purely based on its correct use of nomenclature. Now here’s how I came to that conclusion: Here is a quick backgrounder in naming conventions (for those unfamiliar), which explains the frustration by … Read more
I’m not sure how you dump all the memory to a file without doing this repeatedly (if anyone knows an automated way to get gdb to do this please let me know), but the following works for any one batch of memory assuming you know the pid: $ cat /proc/[pid]/maps This will be in the … Read more
One way would be with sed: mv ‘file’ $(echo ‘file’ | sed -e ‘s/[^A-Za-z0-9._-]/_/g’) Replace file with your filename, of course. This will replace anything that isn’t a letter, number, period, underscore, or dash with an underscore. You can add or remove characters to keep as you like, and/or change the replacement character to anything … Read more